[TD-3048]<feature>: support lines/stream/query_a/stop_query/ and so on. (#7079)

* [TD-3048]<feature>: support lines/stream/query_a/stop_query/ and so on.

commit 0edc106a76a95b28e65019c2ee4e4ed84530ad35
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Thu Jul 29 21:13:13 2021 +0800

    doc: improve document for python connector

commit 84915de0831b49c8378a16242dd0dbba8aaf386f
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Thu Jul 29 20:35:45 2021 +0800

    chore: add time elapsed

commit 1e8822e01bda96388a359363776792e261260b88
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Thu Jul 29 20:26:01 2021 +0800

    feat: support multi bind

commit 82d823f6194471fd3324b50f7dfba0ee9f10a7dd
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Thu Jul 29 16:42:05 2021 +0800

    feat: python support for async query and subscribe with callback

commit 8b9d36de2945906821225189cb47958e153d81e2
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Wed Jul 28 18:09:09 2021 +0800

    feat: finish stream and stmt interface

commit bc871aa43e9fc28dd1b3f8784a8ac6ee988564b5
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Mon Jul 26 20:21:27 2021 +0800

    feat: basic full-fetured implementations

commit e5f7a5213e9016c377a57485e8d5c12139ce0957
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Fri Jul 23 10:33:14 2021 +0800

    tmp: refactor

* chore: fix insert/line_insert.py error

* [TD-3048]<fix>: fix tests error

* [TD-3049]<feature>: support stop_query in python connector cursor

* [TD-3048]<doc>: improve python connector document

* [TD-3048]<doc>: improve python connection README

* [TD-3048]<hotfix>: fix python2 install and runtime error

* chore: replace insertLines with insert_lines

* chore: fix misspellings

* chore: fix crash gen error in threading

* feat: support __del__ method for simplify

* test: fix subscription test result check

* chore: compatible with 2.0.20

* chore: fix python connector subscription test case

* [TD-3048]<fix>: fix schemaless insert test

* [TD-3048]<fix>: fix memory leak in crash_gen test case

* [TD-3048]<fix>: minor fix for crash gen memory leak

* [TD-3048]<fix>: set minimal required python3 as 3.4

* chore: update version in setup.py

* [TD-3048]<fix>: fix runtime errors in python3.4

* [TD-3048]<fix>: add typing as a dependency

src/connector/python/README.md

 # TDengine Connector for Python
 
-[TDengine] connector for Python enables python programs to access TDengine, using an API which is compliant with the Python DB API 2.0 (PEP-249). It uses TDengine C client library for client server communications.
+[TDengine](https://github.com/taosdata/TDengine) connector for Python enables python programs to access TDengine,
+ using an API which is compliant with the Python DB API 2.0 (PEP-249). It uses TDengine C client library for client server communications.
 
 ## Install
 
@@ -11,8 +12,417 @@ pip install ./TDengine/src/connector/python
 
 ## Source Code
 
-[TDengine] connector for Python source code is hosted on [GitHub](https://github.com/taosdata/TDengine/tree/develop/src/connector/python).
+[TDengine](https://github.com/taosdata/TDengine) connector for Python source code is hosted on [GitHub](https://github.com/taosdata/TDengine/tree/develop/src/connector/python).
 
-## License - AGPL
+## Examples
+
+### Query with PEP-249 API
+
+```python
+import taos
+
+conn = taos.connect()
+cursor = conn.cursor()
+
+cursor.execute("show databases")
+results = cursor.fetchall()
+for row in results:
+    print(row)
+cursor.close()
+conn.close()
+```
+
+### Query with objective API
+
+```python
+import taos
+
+conn = taos.connect()
+conn.exec("create database if not exists pytest")
+
+result = conn.query("show databases")
+num_of_fields = result.field_count
+for field in result.fields:
+    print(field)
+for row in result:
+    print(row)
+result.close()
+conn.exec("drop database pytest")
+conn.close()
+```
+
+### Query with async API
+
+```python
+from taos import *
+from ctypes import *
+import time
+
+def fetch_callback(p_param, p_result, num_of_rows):
+    print("fetched ", num_of_rows, "rows")
+    p = cast(p_param, POINTER(Counter))
+    result = TaosResult(p_result)
+
+    if num_of_rows == 0:
+        print("fetching completed")
+        p.contents.done = True
+        result.close()
+        return
+    if num_of_rows < 0:
+        p.contents.done = True
+        result.check_error(num_of_rows)
+        result.close()
+        return None
+    
+    for row in result.rows_iter(num_of_rows):
+        # print(row)
+        None
+    p.contents.count += result.row_count
+    result.fetch_rows_a(fetch_callback, p_param)
+    
+
+
+def query_callback(p_param, p_result, code):
+    # type: (c_void_p, c_void_p, c_int) -> None
+    if p_result == None:
+        return
+    result = TaosResult(p_result)
+    if code == 0:
+        result.fetch_rows_a(fetch_callback, p_param)
+    result.check_error(code)
+
+
+class Counter(Structure):
+    _fields_ = [("count", c_int), ("done", c_bool)]
+
+    def __str__(self):
+        return "{ count: %d, done: %s }" % (self.count, self.done)
+
+
+def test_query(conn):
+    # type: (TaosConnection) -> None
+    counter = Counter(count=0)
+    conn.query_a("select * from log.log", query_callback, byref(counter))
+
+    while not counter.done:
+        print("wait query callback")
+        time.sleep(1)
+    print(counter)
+    conn.close()
+
+
+if __name__ == "__main__":
+    test_query(connect())
+```
+
+### Statement API - Bind row after row
+
+```python
+from taos import *
+
+conn = connect()
+
+dbname = "pytest_taos_stmt"
+conn.exec("drop database if exists %s" % dbname)
+conn.exec("create database if not exists %s" % dbname)
+conn.select_db(dbname)
+
+conn.exec(
+    "create table if not exists log(ts timestamp, bo bool, nil tinyint, \
+        ti tinyint, si smallint, ii int, bi bigint, tu tinyint unsigned, \
+        su smallint unsigned, iu int unsigned, bu bigint unsigned, \
+        ff float, dd double, bb binary(100), nn nchar(100), tt timestamp)",
+)
+
+stmt = conn.statement("insert into log values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
+
+params = new_bind_params(16)
+params[0].timestamp(1626861392589)
+params[1].bool(True)
+params[2].null()
+params[3].tinyint(2)
+params[4].smallint(3)
+params[5].int(4)
+params[6].bigint(5)
+params[7].tinyint_unsigned(6)
+params[8].smallint_unsigned(7)
+params[9].int_unsigned(8)
+params[10].bigint_unsigned(9)
+params[11].float(10.1)
+params[12].double(10.11)
+params[13].binary("hello")
+params[14].nchar("stmt")
+params[15].timestamp(1626861392589)
+stmt.bind_param(params)
+
+params[0].timestamp(1626861392590)
+params[15].null()
+stmt.bind_param(params)
+stmt.execute()
+
+
+result = stmt.use_result()
+assert result.affected_rows == 2
+result.close()
+
+result = conn.query("select * from log")
+
+for row in result:
+    print(row)
+result.close()
+stmt.close()
+conn.close()
+
+```
+
+### Statement API - Bind multi rows
+
+```python
+from taos import *
+
+conn = connect()
+
+dbname = "pytest_taos_stmt"
+conn.exec("drop database if exists %s" % dbname)
+conn.exec("create database if not exists %s" % dbname)
+conn.select_db(dbname)
+
+conn.exec(
+    "create table if not exists log(ts timestamp, bo bool, nil tinyint, \
+        ti tinyint, si smallint, ii int, bi bigint, tu tinyint unsigned, \
+        su smallint unsigned, iu int unsigned, bu bigint unsigned, \
+        ff float, dd double, bb binary(100), nn nchar(100), tt timestamp)",
+)
+
+stmt = conn.statement("insert into log values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
+
+params = new_multi_binds(16)
+params[0].timestamp((1626861392589, 1626861392590, 1626861392591))
+params[1].bool((True, None, False))
+params[2].tinyint([-128, -128, None]) # -128 is tinyint null
+params[3].tinyint([0, 127, None])
+params[4].smallint([3, None, 2])
+params[5].int([3, 4, None])
+params[6].bigint([3, 4, None])
+params[7].tinyint_unsigned([3, 4, None])
+params[8].smallint_unsigned([3, 4, None])
+params[9].int_unsigned([3, 4, None])
+params[10].bigint_unsigned([3, 4, None])
+params[11].float([3, None, 1])
+params[12].double([3, None, 1.2])
+params[13].binary(["abc", "dddafadfadfadfadfa", None])
+params[14].nchar(["涛思数据", None, "a long string with 中文字符"])
+params[15].timestamp([None, None, 1626861392591])
+stmt.bind_param_batch(params)
+stmt.execute()
+
+
+result = stmt.use_result()
+assert result.affected_rows == 3
+result.close()
+
+result = conn.query("select * from log")
+for row in result:
+    print(row)
+result.close()
+stmt.close()
+conn.close()
+```
+
+### Statement API - Subscribe
+
+```python
+import taos
+
+conn = taos.connect()
+dbname = "pytest_taos_subscribe_callback"
+conn.exec("drop database if exists %s" % dbname)
+conn.exec("create database if not exists %s" % dbname)
+conn.select_db(dbname)
+conn.exec("create table if not exists log(ts timestamp, n int)")
+for i in range(10):
+    conn.exec("insert into log values(now, %d)" % i)
+
+sub = conn.subscribe(True, "test", "select * from log", 1000)
+print("# consume from begin")
+for ts, n in sub.consume():
+    print(ts, n)
+
+print("# consume new data")
+for i in range(5):
+    conn.exec("insert into log values(now, %d)(now+1s, %d)" % (i, i))
+    result = sub.consume()
+    for ts, n in result:
+        print(ts, n)
+
+print("# consume with a stop condition")
+for i in range(10):
+    conn.exec("insert into log values(now, %d)" % int(random() * 10))
+    result = sub.consume()
+    try:
+        ts, n = next(result)
+        print(ts, n)
+        if n > 5:
+            result.stop_query()
+            print("## stopped")
+            break
+    except StopIteration:
+        continue
+
+sub.close()
+
+conn.exec("drop database if exists %s" % dbname)
+conn.close()
+```
+
+### Statement API - Subscribe asynchronously with callback
+
+```python
+from taos import *
+from ctypes import *
+
+import time
+
+
+def subscribe_callback(p_sub, p_result, p_param, errno):
+    # type: (c_void_p, c_void_p, c_void_p, c_int) -> None
+    print("# fetch in callback")
+    result = TaosResult(p_result)
+    result.check_error(errno)
+    for row in result.rows_iter():
+        ts, n = row()
+        print(ts, n)
+
+
+def test_subscribe_callback(conn):
+    # type: (TaosConnection) -> None
+    dbname = "pytest_taos_subscribe_callback"
+    try:
+        conn.exec("drop database if exists %s" % dbname)
+        conn.exec("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+        conn.exec("create table if not exists log(ts timestamp, n int)")
+
+        print("# subscribe with callback")
+        sub = conn.subscribe(False, "test", "select * from log", 1000, subscribe_callback)
+
+        for i in range(10):
+            conn.exec("insert into log values(now, %d)" % i)
+            time.sleep(0.7)
+        sub.close()
+
+        conn.exec("drop database if exists %s" % dbname)
+        conn.close()
+    except Exception as err:
+        conn.exec("drop database if exists %s" % dbname)
+        conn.close()
+        raise err
+
+
+if __name__ == "__main__":
+    test_subscribe_callback(connect())
+
+```
+
+### Statement API - Stream
+
+```python
+from taos import *
+from ctypes import *
+
+def stream_callback(p_param, p_result, p_row):
+    # type: (c_void_p, c_void_p, c_void_p) -> None
+
+    if p_result == None or p_row == None:
+        return
+    result = TaosResult(p_result)
+    row = TaosRow(result, p_row)
+    try:
+        ts, count = row()
+        p = cast(p_param, POINTER(Counter))
+        p.contents.count += count
+        print("[%s] inserted %d in 5s, total count: %d" % (ts.strftime("%Y-%m-%d %H:%M:%S"), count, p.contents.count))
+
+    except Exception as err:
+        print(err)
+        raise err
+
+
+class Counter(ctypes.Structure):
+    _fields_ = [
+        ("count", c_int),
+    ]
+
+    def __str__(self):
+        return "%d" % self.count
+
+
+def test_stream(conn):
+    # type: (TaosConnection) -> None
+    dbname = "pytest_taos_stream"
+    try:
+        conn.exec("drop database if exists %s" % dbname)
+        conn.exec("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+        conn.exec("create table if not exists log(ts timestamp, n int)")
+
+        result = conn.query("select count(*) from log interval(5s)")
+        assert result.field_count == 2
+        counter = Counter()
+        counter.count = 0
+        stream = conn.stream("select count(*) from log interval(5s)", stream_callback, param=byref(counter))
+
+        for _ in range(0, 20):
+            conn.exec("insert into log values(now,0)(now+1s, 1)(now + 2s, 2)")
+            time.sleep(2)
+        stream.close()
+        conn.exec("drop database if exists %s" % dbname)
+        conn.close()
+    except Exception as err:
+        conn.exec("drop database if exists %s" % dbname)
+        conn.close()
+        raise err
+
+
+if __name__ == "__main__":
+    test_stream(connect())
+```
+
+### Insert with line protocol
+
+```python
+import taos
+
+conn = taos.connect()
+dbname = "pytest_line"
+conn.exec("drop database if exists %s" % dbname)
+conn.exec("create database if not exists %s precision 'us'" % dbname)
+conn.select_db(dbname)
+
+lines = [
+    'st,t1=3i64,t2=4f64,t3="t3" c1=3i64,c3=L"pass",c2=false,c4=4f64 1626006833639000000ns',
+    'st,t1=4i64,t3="t4",t2=5f64,t4=5f64 c1=3i64,c3=L"pass it again",c2=true,c4=5f64,c5=5f64,c6=7u64 1626006933640000000ns',
+    'stf,t1=4i64,t3="t4",t2=5f64,t4=5f64 c1=3i64,c3=L"pass it again_stf",c2=false,c5=5f64,c6=7u64 1626006933641000000ns',
+]
+conn.insert_lines(lines)
+print("inserted")
+
+lines = [
+    'stf,t1=5i64,t3="t4",t2=5f64,t4=5f64 c1=3i64,c3=L"pass it again_stf",c2=false,c5=5f64,c6=7u64 1626006933641000000ns',
+]
+conn.insert_lines(lines)
+
+result = conn.query("show tables")
+for row in result:
+    print(row)
+result.close()
+
+
+conn.exec("drop database if exists %s" % dbname)
+conn.close()
+
+```
+
+## License - AGPL-3.0
 
 Keep same with [TDengine](https://github.com/taosdata/TDengine).

src/connector/python/examples/bind-multi.py

+# encoding:UTF-8
+from taos import *
+
+conn = connect()
+
+dbname = "pytest_taos_stmt_multi"
+conn.execute("drop database if exists %s" % dbname)
+conn.execute("create database if not exists %s" % dbname)
+conn.select_db(dbname)
+
+conn.execute(
+    "create table if not exists log(ts timestamp, bo bool, nil tinyint, \
+        ti tinyint, si smallint, ii int, bi bigint, tu tinyint unsigned, \
+        su smallint unsigned, iu int unsigned, bu bigint unsigned, \
+        ff float, dd double, bb binary(100), nn nchar(100), tt timestamp)",
+)
+
+stmt = conn.statement("insert into log values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
+
+params = new_multi_binds(16)
+params[0].timestamp((1626861392589, 1626861392590, 1626861392591))
+params[1].bool((True, None, False))
+params[2].tinyint([-128, -128, None]) # -128 is tinyint null
+params[3].tinyint([0, 127, None])
+params[4].smallint([3, None, 2])
+params[5].int([3, 4, None])
+params[6].bigint([3, 4, None])
+params[7].tinyint_unsigned([3, 4, None])
+params[8].smallint_unsigned([3, 4, None])
+params[9].int_unsigned([3, 4, None])
+params[10].bigint_unsigned([3, 4, None])
+params[11].float([3, None, 1])
+params[12].double([3, None, 1.2])
+params[13].binary(["abc", "dddafadfadfadfadfa", None])
+params[14].nchar(["涛思数据", None, "a long string with 中文字符"])
+params[15].timestamp([None, None, 1626861392591])
+stmt.bind_param_batch(params)
+stmt.execute()
+
+
+result = stmt.use_result()
+assert result.affected_rows == 3
+result.close()
+
+result = conn.query("select * from log")
+for row in result:
+    print(row)
+result.close()
+stmt.close()
+conn.close()
\ No newline at end of file

src/connector/python/examples/bind-row.py

+from taos import *
+
+conn = connect()
+
+dbname = "pytest_taos_stmt"
+conn.execute("drop database if exists %s" % dbname)
+conn.execute("create database if not exists %s" % dbname)
+conn.select_db(dbname)
+
+conn.execute(
+    "create table if not exists log(ts timestamp, bo bool, nil tinyint, \
+        ti tinyint, si smallint, ii int, bi bigint, tu tinyint unsigned, \
+        su smallint unsigned, iu int unsigned, bu bigint unsigned, \
+        ff float, dd double, bb binary(100), nn nchar(100), tt timestamp)",
+)
+
+stmt = conn.statement("insert into log values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
+
+params = new_bind_params(16)
+params[0].timestamp(1626861392589)
+params[1].bool(True)
+params[2].null()
+params[3].tinyint(2)
+params[4].smallint(3)
+params[5].int(4)
+params[6].bigint(5)
+params[7].tinyint_unsigned(6)
+params[8].smallint_unsigned(7)
+params[9].int_unsigned(8)
+params[10].bigint_unsigned(9)
+params[11].float(10.1)
+params[12].double(10.11)
+params[13].binary("hello")
+params[14].nchar("stmt")
+params[15].timestamp(1626861392589)
+stmt.bind_param(params)
+
+params[0].timestamp(1626861392590)
+params[15].null()
+stmt.bind_param(params)
+stmt.execute()
+
+
+result = stmt.use_result()
+assert result.affected_rows == 2
+# No need to explicitly close, but ok for you
+# result.close()
+
+result = conn.query("select * from log")
+
+for row in result:
+    print(row)
+
+# No need to explicitly close, but ok for you
+# result.close()
+# stmt.close()
+# conn.close()

src/connector/python/examples/insert-lines.py

+import taos
+
+conn = taos.connect()
+dbname = "pytest_line"
+conn.execute("drop database if exists %s" % dbname)
+conn.execute("create database if not exists %s precision 'us'" % dbname)
+conn.select_db(dbname)
+
+lines = [
+    'st,t1=3i64,t2=4f64,t3="t3" c1=3i64,c3=L"pass",c2=false,c4=4f64 1626006833639000000ns',
+]
+conn.insert_lines(lines)
+print("inserted")
+
+conn.insert_lines(lines)
+
+result = conn.query("show tables")
+for row in result:
+    print(row)
+
+
+conn.execute("drop database if exists %s" % dbname)

src/connector/python/examples/pep-249.py

+import taos
+
+conn = taos.connect()
+cursor = conn.cursor()
+
+cursor.execute("show databases")
+results = cursor.fetchall()
+for row in results:
+    print(row)

src/connector/python/examples/query-async.py

+from taos import *
+from ctypes import *
+import time
+
+def fetch_callback(p_param, p_result, num_of_rows):
+    print("fetched ", num_of_rows, "rows")
+    p = cast(p_param, POINTER(Counter))
+    result = TaosResult(p_result)
+
+    if num_of_rows == 0:
+        print("fetching completed")
+        p.contents.done = True
+        # should explicitly close the result in fetch completed or cause error
+        result.close()
+        return
+    if num_of_rows < 0:
+        p.contents.done = True
+        result.check_error(num_of_rows)
+        result.close()
+        return None
+    
+    for row in result.rows_iter(num_of_rows):
+        # print(row)
+        None
+    p.contents.count += result.row_count
+    result.fetch_rows_a(fetch_callback, p_param)
+    
+
+
+def query_callback(p_param, p_result, code):
+    # type: (c_void_p, c_void_p, c_int) -> None
+    if p_result == None:
+        return
+    result = TaosResult(p_result)
+    if code == 0:
+        result.fetch_rows_a(fetch_callback, p_param)
+    result.check_error(code)
+    # explicitly close result while query failed
+    result.close()
+
+
+class Counter(Structure):
+    _fields_ = [("count", c_int), ("done", c_bool)]
+
+    def __str__(self):
+        return "{ count: %d, done: %s }" % (self.count, self.done)
+
+
+def test_query(conn):
+    # type: (TaosConnection) -> None
+    counter = Counter(count=0)
+    conn.query_a("select * from log.log", query_callback, byref(counter))
+
+    while not counter.done:
+        print("wait query callback")
+        time.sleep(1)
+    print(counter)
+    # conn.close()
+
+
+if __name__ == "__main__":
+    test_query(connect())
\ No newline at end of file

src/connector/python/examples/query-objectively.py

+import taos
+
+conn = taos.connect()
+conn.execute("create database if not exists pytest")
+
+result = conn.query("show databases")
+num_of_fields = result.field_count
+for field in result.fields:
+    print(field)
+for row in result:
+    print(row)
+conn.execute("drop database pytest")

src/connector/python/examples/subscribe-async.py

+from taos import *
+from ctypes import *
+
+import time
+
+
+def subscribe_callback(p_sub, p_result, p_param, errno):
+    # type: (c_void_p, c_void_p, c_void_p, c_int) -> None
+    print("# fetch in callback")
+    result = TaosResult(p_result)
+    result.check_error(errno)
+    for row in result.rows_iter():
+        ts, n = row()
+        print(ts, n)
+
+
+def test_subscribe_callback(conn):
+    # type: (TaosConnection) -> None
+    dbname = "pytest_taos_subscribe_callback"
+    try:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.execute("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+        conn.execute("create table if not exists log(ts timestamp, n int)")
+
+        print("# subscribe with callback")
+        sub = conn.subscribe(False, "test", "select * from log", 1000, subscribe_callback)
+
+        for i in range(10):
+            conn.execute("insert into log values(now, %d)" % i)
+            time.sleep(0.7)
+        # sub.close()
+
+        conn.execute("drop database if exists %s" % dbname)
+        # conn.close()
+    except Exception as err:
+        conn.execute("drop database if exists %s" % dbname)
+        # conn.close()
+        raise err
+
+
+if __name__ == "__main__":
+    test_subscribe_callback(connect())

src/connector/python/examples/subscribe-sync.py

+import taos
+import random
+
+conn = taos.connect()
+dbname = "pytest_taos_subscribe"
+conn.execute("drop database if exists %s" % dbname)
+conn.execute("create database if not exists %s" % dbname)
+conn.select_db(dbname)
+conn.execute("create table if not exists log(ts timestamp, n int)")
+for i in range(10):
+    conn.execute("insert into log values(now, %d)" % i)
+
+sub = conn.subscribe(False, "test", "select * from log", 1000)
+print("# consume from begin")
+for ts, n in sub.consume():
+    print(ts, n)
+
+print("# consume new data")
+for i in range(5):
+    conn.execute("insert into log values(now, %d)(now+1s, %d)" % (i, i))
+    result = sub.consume()
+    for ts, n in result:
+        print(ts, n)
+
+sub.close(True)
+print("# keep progress consume")
+sub = conn.subscribe(False, "test", "select * from log", 1000)
+result = sub.consume()
+rows = result.fetch_all()
+# consume from latest subscription needs root privilege(for /var/lib/taos).
+assert result.row_count == 0
+print("## consumed ", len(rows), "rows")
+
+print("# consume with a stop condition")
+for i in range(10):
+    conn.execute("insert into log values(now, %d)" % random.randint(0, 10))
+    result = sub.consume()
+    try:
+        ts, n = next(result)
+        print(ts, n)
+        if n > 5:
+            result.stop_query()
+            print("## stopped")
+            break
+    except StopIteration:
+        continue
+
+sub.close()
+
+# sub.close()
+
+conn.execute("drop database if exists %s" % dbname)
+# conn.close()

src/connector/python/pyproject.toml

+[tool.poetry]
+name = "taos"
+version = "2.1.0"
+description = "TDengine connector for python"
+authors = ["Taosdata Inc. <support@taosdata.com>"]
+license = "AGPL-3.0"
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = "^2.7 || ^3.4"
+typing = "*"
+
+[tool.poetry.dev-dependencies]
+pytest = [
+  { version = "^4.6", python = "^2.7" },
+  { version = "^6.2", python = "^3.7" }
+]
+pdoc = { version = "^7.1.1", python = "^3.7" }
+mypy = { version = "^0.910", python = "^3.6" }
+black = { version = "^21.7b0", python = "^3.6" }
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.black]
+line-length = 119

src/connector/python/setup.py

@@ -5,7 +5,7 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name="taos",
-    version="2.0.11",
+    version="2.1.0",
     author="Taosdata Inc.",
     author_email="support@taosdata.com",
     description="TDengine python client package",

src/connector/python/taos/__init__.py

+# encoding:UTF-8
+"""
+# TDengine Connector for Python
 
-from .connection import TDengineConnection
-from .cursor import TDengineCursor
+[TDengine](https://github.com/taosdata/TDengine) connector for Python enables python programs to access TDengine,
+ using an API which is compliant with the Python DB API 2.0 (PEP-249). It uses TDengine C client library for client server communications.
 
-# For some reason, the following is needed for VS Code (through PyLance) to 
+## Install
+
+```sh
+git clone --depth 1 https://github.com/taosdata/TDengine.git
+pip install ./TDengine/src/connector/python
+```
+
+## Source Code
+
+[TDengine](https://github.com/taosdata/TDengine) connector for Python source code is hosted on [GitHub](https://github.com/taosdata/TDengine/tree/develop/src/connector/python).
+
+## Examples
+
+### Query with PEP-249 API
+
+```python
+import taos
+
+conn = taos.connect()
+cursor = conn.cursor()
+
+cursor.execute("show databases")
+results = cursor.fetchall()
+for row in results:
+    print(row)
+cursor.close()
+conn.close()
+```
+
+### Query with objective API
+
+```python
+import taos
+
+conn = taos.connect()
+conn.exec("create database if not exists pytest")
+
+result = conn.query("show databases")
+num_of_fields = result.field_count
+for field in result.fields:
+    print(field)
+for row in result:
+    print(row)
+result.close()
+conn.exec("drop database pytest")
+conn.close()
+```
+
+### Query with async API
+
+```python
+from taos import *
+from ctypes import *
+import time
+
+def fetch_callback(p_param, p_result, num_of_rows):
+    print("fetched ", num_of_rows, "rows")
+    p = cast(p_param, POINTER(Counter))
+    result = TaosResult(p_result)
+
+    if num_of_rows == 0:
+        print("fetching completed")
+        p.contents.done = True
+        result.close()
+        return
+    if num_of_rows < 0:
+        p.contents.done = True
+        result.check_error(num_of_rows)
+        result.close()
+        return None
+    
+    for row in result.rows_iter(num_of_rows):
+        # print(row)
+        None
+    p.contents.count += result.row_count
+    result.fetch_rows_a(fetch_callback, p_param)
+    
+
+
+def query_callback(p_param, p_result, code):
+    # type: (c_void_p, c_void_p, c_int) -> None
+    if p_result == None:
+        return
+    result = TaosResult(p_result)
+    if code == 0:
+        result.fetch_rows_a(fetch_callback, p_param)
+    result.check_error(code)
+
+
+class Counter(Structure):
+    _fields_ = [("count", c_int), ("done", c_bool)]
+
+    def __str__(self):
+        return "{ count: %d, done: %s }" % (self.count, self.done)
+
+
+def test_query(conn):
+    # type: (TaosConnection) -> None
+    counter = Counter(count=0)
+    conn.query_a("select * from log.log", query_callback, byref(counter))
+
+    while not counter.done:
+        print("wait query callback")
+        time.sleep(1)
+    print(counter)
+    conn.close()
+
+
+if __name__ == "__main__":
+    test_query(connect())
+```
+
+### Statement API - Bind row after row
+
+```python
+from taos import *
+
+conn = connect()
+
+dbname = "pytest_taos_stmt"
+conn.exec("drop database if exists %s" % dbname)
+conn.exec("create database if not exists %s" % dbname)
+conn.select_db(dbname)
+
+conn.exec(
+    "create table if not exists log(ts timestamp, bo bool, nil tinyint, \\
+        ti tinyint, si smallint, ii int, bi bigint, tu tinyint unsigned, \\
+        su smallint unsigned, iu int unsigned, bu bigint unsigned, \\
+        ff float, dd double, bb binary(100), nn nchar(100), tt timestamp)",
+)
+
+stmt = conn.statement("insert into log values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
+
+params = new_bind_params(16)
+params[0].timestamp(1626861392589)
+params[1].bool(True)
+params[2].null()
+params[3].tinyint(2)
+params[4].smallint(3)
+params[5].int(4)
+params[6].bigint(5)
+params[7].tinyint_unsigned(6)
+params[8].smallint_unsigned(7)
+params[9].int_unsigned(8)
+params[10].bigint_unsigned(9)
+params[11].float(10.1)
+params[12].double(10.11)
+params[13].binary("hello")
+params[14].nchar("stmt")
+params[15].timestamp(1626861392589)
+stmt.bind_param(params)
+
+params[0].timestamp(1626861392590)
+params[15].null()
+stmt.bind_param(params)
+stmt.execute()
+
+
+result = stmt.use_result()
+assert result.affected_rows == 2
+result.close()
+
+result = conn.query("select * from log")
+
+for row in result:
+    print(row)
+result.close()
+stmt.close()
+conn.close()
+
+```
+
+### Statement API - Bind multi rows
+
+```python
+from taos import *
+
+conn = connect()
+
+dbname = "pytest_taos_stmt"
+conn.exec("drop database if exists %s" % dbname)
+conn.exec("create database if not exists %s" % dbname)
+conn.select_db(dbname)
+
+conn.exec(
+    "create table if not exists log(ts timestamp, bo bool, nil tinyint, \\
+        ti tinyint, si smallint, ii int, bi bigint, tu tinyint unsigned, \\
+        su smallint unsigned, iu int unsigned, bu bigint unsigned, \\
+        ff float, dd double, bb binary(100), nn nchar(100), tt timestamp)",
+)
+
+stmt = conn.statement("insert into log values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
+
+params = new_multi_binds(16)
+params[0].timestamp((1626861392589, 1626861392590, 1626861392591))
+params[1].bool((True, None, False))
+params[2].tinyint([-128, -128, None]) # -128 is tinyint null
+params[3].tinyint([0, 127, None])
+params[4].smallint([3, None, 2])
+params[5].int([3, 4, None])
+params[6].bigint([3, 4, None])
+params[7].tinyint_unsigned([3, 4, None])
+params[8].smallint_unsigned([3, 4, None])
+params[9].int_unsigned([3, 4, None])
+params[10].bigint_unsigned([3, 4, None])
+params[11].float([3, None, 1])
+params[12].double([3, None, 1.2])
+params[13].binary(["abc", "dddafadfadfadfadfa", None])
+params[14].nchar(["涛思数据", None, "a long string with 中文字符"])
+params[15].timestamp([None, None, 1626861392591])
+stmt.bind_param_batch(params)
+stmt.execute()
+
+
+result = stmt.use_result()
+assert result.affected_rows == 3
+result.close()
+
+result = conn.query("select * from log")
+for row in result:
+    print(row)
+result.close()
+stmt.close()
+conn.close()
+```
+
+### Statement API - Subscribe
+
+```python
+import taos
+
+conn = taos.connect()
+dbname = "pytest_taos_subscribe_callback"
+conn.exec("drop database if exists %s" % dbname)
+conn.exec("create database if not exists %s" % dbname)
+conn.select_db(dbname)
+conn.exec("create table if not exists log(ts timestamp, n int)")
+for i in range(10):
+    conn.exec("insert into log values(now, %d)" % i)
+
+sub = conn.subscribe(True, "test", "select * from log", 1000)
+print("# consume from begin")
+for ts, n in sub.consume():
+    print(ts, n)
+
+print("# consume new data")
+for i in range(5):
+    conn.exec("insert into log values(now, %d)(now+1s, %d)" % (i, i))
+    result = sub.consume()
+    for ts, n in result:
+        print(ts, n)
+
+print("# consume with a stop condition")
+for i in range(10):
+    conn.exec("insert into log values(now, %d)" % int(random() * 10))
+    result = sub.consume()
+    try:
+        ts, n = next(result)
+        print(ts, n)
+        if n > 5:
+            result.stop_query()
+            print("## stopped")
+            break
+    except StopIteration:
+        continue
+
+sub.close()
+
+conn.exec("drop database if exists %s" % dbname)
+conn.close()
+```
+
+### Statement API - Subscribe asynchronously with callback
+
+```python
+from taos import *
+from ctypes import *
+
+import time
+
+
+def subscribe_callback(p_sub, p_result, p_param, errno):
+    # type: (c_void_p, c_void_p, c_void_p, c_int) -> None
+    print("# fetch in callback")
+    result = TaosResult(p_result)
+    result.check_error(errno)
+    for row in result.rows_iter():
+        ts, n = row()
+        print(ts, n)
+
+
+def test_subscribe_callback(conn):
+    # type: (TaosConnection) -> None
+    dbname = "pytest_taos_subscribe_callback"
+    try:
+        conn.exec("drop database if exists %s" % dbname)
+        conn.exec("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+        conn.exec("create table if not exists log(ts timestamp, n int)")
+
+        print("# subscribe with callback")
+        sub = conn.subscribe(False, "test", "select * from log", 1000, subscribe_callback)
+
+        for i in range(10):
+            conn.exec("insert into log values(now, %d)" % i)
+            time.sleep(0.7)
+        sub.close()
+
+        conn.exec("drop database if exists %s" % dbname)
+        conn.close()
+    except Exception as err:
+        conn.exec("drop database if exists %s" % dbname)
+        conn.close()
+        raise err
+
+
+if __name__ == "__main__":
+    test_subscribe_callback(connect())
+
+```
+
+### Statement API - Stream
+
+```python
+from taos import *
+from ctypes import *
+
+def stream_callback(p_param, p_result, p_row):
+    # type: (c_void_p, c_void_p, c_void_p) -> None
+
+    if p_result == None or p_row == None:
+        return
+    result = TaosResult(p_result)
+    row = TaosRow(result, p_row)
+    try:
+        ts, count = row()
+        p = cast(p_param, POINTER(Counter))
+        p.contents.count += count
+        print("[%s] inserted %d in 5s, total count: %d" % (ts.strftime("%Y-%m-%d %H:%M:%S"), count, p.contents.count))
+
+    except Exception as err:
+        print(err)
+        raise err
+
+
+class Counter(ctypes.Structure):
+    _fields_ = [
+        ("count", c_int),
+    ]
+
+    def __str__(self):
+        return "%d" % self.count
+
+
+def test_stream(conn):
+    # type: (TaosConnection) -> None
+    dbname = "pytest_taos_stream"
+    try:
+        conn.exec("drop database if exists %s" % dbname)
+        conn.exec("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+        conn.exec("create table if not exists log(ts timestamp, n int)")
+
+        result = conn.query("select count(*) from log interval(5s)")
+        assert result.field_count == 2
+        counter = Counter()
+        counter.count = 0
+        stream = conn.stream("select count(*) from log interval(5s)", stream_callback, param=byref(counter))
+
+        for _ in range(0, 20):
+            conn.exec("insert into log values(now,0)(now+1s, 1)(now + 2s, 2)")
+            time.sleep(2)
+        stream.close()
+        conn.exec("drop database if exists %s" % dbname)
+        conn.close()
+    except Exception as err:
+        conn.exec("drop database if exists %s" % dbname)
+        conn.close()
+        raise err
+
+
+if __name__ == "__main__":
+    test_stream(connect())
+```
+
+### Insert with line protocol
+
+```python
+import taos
+
+conn = taos.connect()
+dbname = "pytest_line"
+conn.exec("drop database if exists %s" % dbname)
+conn.exec("create database if not exists %s precision 'us'" % dbname)
+conn.select_db(dbname)
+
+lines = [
+    'st,t1=3i64,t2=4f64,t3="t3" c1=3i64,c3=L"passit",c2=false,c4=4f64 1626006833639000000ns',
+    'st,t1=4i64,t3="t4",t2=5f64,t4=5f64 c1=3i64,c3=L"passitagin",c2=true,c4=5f64,c5=5f64,c6=7u64 1626006933640000000ns',
+    'stf,t1=4i64,t3="t4",t2=5f64,t4=5f64 c1=3i64,c3=L"passitagin_stf",c2=false,c5=5f64,c6=7u64 1626006933641000000ns',
+]
+conn.insert_lines(lines)
+print("inserted")
+
+lines = [
+    'stf,t1=5i64,t3="t4",t2=5f64,t4=5f64 c1=3i64,c3=L"passitagin_stf",c2=false,c5=5f64,c6=7u64 1626006933641000000ns',
+]
+conn.insert_lines(lines)
+
+result = conn.query("show tables")
+for row in result:
+    print(row)
+result.close()
+
+
+conn.exec("drop database if exists %s" % dbname)
+conn.close()
+
+```
+
+## License - AGPL-3.0
+
+Keep same with [TDengine](https://github.com/taosdata/TDengine).
+"""
+from .connection import TaosConnection
+
+# For some reason, the following is needed for VS Code (through PyLance) to
 # recognize that "error" is a valid module of the "taos" package.
-from .error import ProgrammingError
+from .error import *
+from .bind import *
+from .field import *
+from .cursor import *
+from .result import *
+from .statement import *
+from .subscription import *
+
+try:
+    import importlib.metadata
+
+    __version__ = importlib.metadata.version("taos")
+except:
+    None
 
 # Globals
 threadsafety = 0
-paramstyle = 'pyformat'
-
-__all__ = ['connection', 'cursor']
+paramstyle = "pyformat"
 
+__all__ = [
+    # functions
+    "connect",
+    "new_bind_param",
+    "new_bind_params",
+    "new_multi_binds",
+    "new_multi_bind",
+    # objects
+    "TaosBind",
+    "TaosConnection",
+    "TaosCursor",
+    "TaosResult",
+    "TaosRows",
+    "TaosRow",
+    "TaosStmt",
+    "PrecisionEnum",
+]
 
 def connect(*args, **kwargs):
-    """ Function to return a TDengine connector object
+    # type: (..., ...) -> TaosConnection
+    """Function to return a TDengine connector object
 
     Current supporting keyword parameters:
     @dsn: Data source name as string
@@ -25,4 +483,4 @@ def connect(*args, **kwargs):
 
     @rtype: TDengineConnector
     """
-    return TDengineConnection(*args, **kwargs)
+    return TaosConnection(*args, **kwargs)

src/connector/python/taos/bind.py

+# encoding:UTF-8
+import ctypes
+from .constants import FieldType
+from .error import *
+from .precision import *
+from datetime import datetime
+from ctypes import *
+import sys
+
+_datetime_epoch = datetime.utcfromtimestamp(0)
+
+def _is_not_none(obj):
+    obj != None
+class TaosBind(ctypes.Structure):
+    _fields_ = [
+        ("buffer_type", c_int),
+        ("buffer", c_void_p),
+        ("buffer_length", c_size_t),
+        ("length", POINTER(c_size_t)),
+        ("is_null", POINTER(c_int)),
+        ("is_unsigned", c_int),
+        ("error", POINTER(c_int)),
+        ("u", c_int64),
+        ("allocated", c_int),
+    ]
+
+    def null(self):
+        self.buffer_type = FieldType.C_NULL
+        self.is_null = pointer(c_int(1))
+
+    def bool(self, value):
+        self.buffer_type = FieldType.C_BOOL
+        self.buffer = cast(pointer(c_bool(value)), c_void_p)
+        self.buffer_length = sizeof(c_bool)
+
+    def tinyint(self, value):
+        self.buffer_type = FieldType.C_TINYINT
+        self.buffer = cast(pointer(c_int8(value)), c_void_p)
+        self.buffer_length = sizeof(c_int8)
+
+    def smallint(self, value):
+        self.buffer_type = FieldType.C_SMALLINT
+        self.buffer = cast(pointer(c_int16(value)), c_void_p)
+        self.buffer_length = sizeof(c_int16)
+
+    def int(self, value):
+        self.buffer_type = FieldType.C_INT
+        self.buffer = cast(pointer(c_int32(value)), c_void_p)
+        self.buffer_length = sizeof(c_int32)
+
+    def bigint(self, value):
+        self.buffer_type = FieldType.C_BIGINT
+        self.buffer = cast(pointer(c_int64(value)), c_void_p)
+        self.buffer_length = sizeof(c_int64)
+
+    def float(self, value):
+        self.buffer_type = FieldType.C_FLOAT
+        self.buffer = cast(pointer(c_float(value)), c_void_p)
+        self.buffer_length = sizeof(c_float)
+
+    def double(self, value):
+        self.buffer_type = FieldType.C_DOUBLE
+        self.buffer = cast(pointer(c_double(value)), c_void_p)
+        self.buffer_length = sizeof(c_double)
+
+    def binary(self, value):
+        buffer = None
+        length = 0
+        if isinstance(value, str):
+            bytes = value.encode("utf-8")
+            buffer = create_string_buffer(bytes)
+            length = len(bytes)
+        else:
+            buffer = value
+            length = len(value)
+        self.buffer_type = FieldType.C_BINARY
+        self.buffer = cast(buffer, c_void_p)
+        self.buffer_length = length
+        self.length = pointer(c_size_t(self.buffer_length))
+
+    def timestamp(self, value, precision=PrecisionEnum.Milliseconds):
+        if type(value) is datetime:
+            if precision == PrecisionEnum.Milliseconds:
+                ts = int(round((value - _datetime_epoch).total_seconds() * 1000))
+            elif precision == PrecisionEnum.Microseconds:
+                ts = int(round((value - _datetime_epoch).total_seconds() * 10000000))
+            else:
+                raise PrecisionError("datetime do not support nanosecond precision")
+        elif type(value) is float:
+            if precision == PrecisionEnum.Milliseconds:
+                ts = int(round(value * 1000))
+            elif precision == PrecisionEnum.Microseconds:
+                ts = int(round(value * 10000000))
+            else:
+                raise PrecisionError("time float do not support nanosecond precision")
+        elif isinstance(value, int) and not isinstance(value, bool):
+            ts = value
+        elif isinstance(value, str):
+            value = datetime.fromisoformat(value)
+            if precision == PrecisionEnum.Milliseconds:
+                ts = int(round(value * 1000))
+            elif precision == PrecisionEnum.Microseconds:
+                ts = int(round(value * 10000000))
+            else:
+                raise PrecisionError("datetime do not support nanosecond precision")
+
+        self.buffer_type = FieldType.C_TIMESTAMP
+        self.buffer = cast(pointer(c_int64(ts)), c_void_p)
+        self.buffer_length = sizeof(c_int64)
+
+    def nchar(self, value):
+        buffer = None
+        length = 0
+        if isinstance(value, str):
+            bytes = value.encode("utf-8")
+            buffer = create_string_buffer(bytes)
+            length = len(bytes)
+        else:
+            buffer = value
+            length = len(value)
+        self.buffer_type = FieldType.C_NCHAR
+        self.buffer = cast(buffer, c_void_p)
+        self.buffer_length = length
+        self.length = pointer(c_size_t(self.buffer_length))
+
+    def tinyint_unsigned(self, value):
+        self.buffer_type = FieldType.C_TINYINT_UNSIGNED
+        self.buffer = cast(pointer(c_uint8(value)), c_void_p)
+        self.buffer_length = sizeof(c_uint8)
+
+    def smallint_unsigned(self, value):
+        self.buffer_type = FieldType.C_SMALLINT_UNSIGNED
+        self.buffer = cast(pointer(c_uint16(value)), c_void_p)
+        self.buffer_length = sizeof(c_uint16)
+
+    def int_unsigned(self, value):
+        self.buffer_type = FieldType.C_INT_UNSIGNED
+        self.buffer = cast(pointer(c_uint32(value)), c_void_p)
+        self.buffer_length = sizeof(c_uint32)
+
+    def bigint_unsigned(self, value):
+        self.buffer_type = FieldType.C_BIGINT_UNSIGNED
+        self.buffer = cast(pointer(c_uint64(value)), c_void_p)
+        self.buffer_length = sizeof(c_uint64)
+
+
+def _datetime_to_timestamp(value, precision):
+    # type: (datetime | float | int | str | c_int64, PrecisionEnum) -> c_int64
+    if value is None:
+        return FieldType.C_BIGINT_NULL
+    if type(value) is datetime:
+        if precision == PrecisionEnum.Milliseconds:
+            return int(round((value - _datetime_epoch).total_seconds() * 1000))
+        elif precision == PrecisionEnum.Microseconds:
+            return int(round((value - _datetime_epoch).total_seconds() * 10000000))
+        else:
+            raise PrecisionError("datetime do not support nanosecond precision")
+    elif type(value) is float:
+        if precision == PrecisionEnum.Milliseconds:
+            return int(round(value * 1000))
+        elif precision == PrecisionEnum.Microseconds:
+            return int(round(value * 10000000))
+        else:
+            raise PrecisionError("time float do not support nanosecond precision")
+    elif isinstance(value, int) and not isinstance(value, bool):
+        return c_int64(value)
+    elif isinstance(value, str):
+        value = datetime.fromisoformat(value)
+        if precision == PrecisionEnum.Milliseconds:
+            return int(round(value * 1000))
+        elif precision == PrecisionEnum.Microseconds:
+            return int(round(value * 10000000))
+        else:
+            raise PrecisionError("datetime do not support nanosecond precision")
+    elif isinstance(value, c_int64):
+        return value
+    return FieldType.C_BIGINT_NULL
+
+
+class TaosMultiBind(ctypes.Structure):
+    _fields_ = [
+        ("buffer_type", c_int),
+        ("buffer", c_void_p),
+        ("buffer_length", c_size_t),
+        ("length", POINTER(c_int32)),
+        ("is_null", c_char_p),
+        ("num", c_int),
+    ]
+
+    def null(self, num):
+        self.buffer_type = FieldType.C_NULL
+        self.is_null = cast((c_char * num)(*[1 for _ in range(num)]), c_char_p)
+        self.buffer = c_void_p(None)
+        self.num = num
+
+    def bool(self, values):
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_int8 * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_BOOL_NULL for v in values])
+
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+        self.buffer_type = FieldType.C_BOOL
+        self.buffer_length = sizeof(c_bool)
+
+    def tinyint(self, values):
+        self.buffer_type = FieldType.C_TINYINT
+        self.buffer_length = sizeof(c_int8)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_int8 * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_TINYINT_NULL for v in values])
+
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+    def smallint(self, values):
+        self.buffer_type = FieldType.C_SMALLINT
+        self.buffer_length = sizeof(c_int16)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_int16 * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_SMALLINT_NULL for v in values])
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+    def int(self, values):
+        self.buffer_type = FieldType.C_INT
+        self.buffer_length = sizeof(c_int32)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_int32 * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_INT_NULL for v in values])
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+    def bigint(self, values):
+        self.buffer_type = FieldType.C_BIGINT
+        self.buffer_length = sizeof(c_int64)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_int64 * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_BIGINT_NULL for v in values])
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+    def float(self, values):
+        self.buffer_type = FieldType.C_FLOAT
+        self.buffer_length = sizeof(c_float)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_float * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_FLOAT_NULL for v in values])
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+    def double(self, values):
+        self.buffer_type = FieldType.C_DOUBLE
+        self.buffer_length = sizeof(c_double)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_double * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_DOUBLE_NULL for v in values])
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+    def binary(self, values):
+        self.num = len(values)
+        self.buffer = cast(c_char_p("".join(filter(_is_not_none, values)).encode("utf-8")), c_void_p)
+        self.length = (c_int * len(values))(*[len(value) if value is not None else 0 for value in values])
+        self.buffer_type = FieldType.C_BINARY
+        self.is_null = cast((c_byte * self.num)(*[1 if v == None else 0 for v in values]), c_char_p)
+
+    def timestamp(self, values, precision=PrecisionEnum.Milliseconds):
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_int64 * len(values)
+            buffer = buffer_type(*[_datetime_to_timestamp(value, precision) for value in values])
+
+        self.buffer_type = FieldType.C_TIMESTAMP
+        self.buffer = cast(buffer, c_void_p)
+        self.buffer_length = sizeof(c_int64)
+        self.num = len(values)
+
+    def nchar(self, values):
+        # type: (list[str]) -> None
+        if sys.version_info < (3, 0):
+            _bytes = [bytes(value) if value is not None else None for value in values]
+            buffer_length = max(len(b) + 1 for b in _bytes if b is not None)
+            buffers = [
+                create_string_buffer(b, buffer_length) if b is not None else create_string_buffer(buffer_length)
+                for b in _bytes
+            ]
+            buffer_all = b''.join(v[:] for v in buffers)
+            self.buffer = cast(c_char_p(buffer_all), c_void_p)
+        else:
+            _bytes = [value.encode("utf-8") if value is not None else None for value in values]
+            buffer_length = max(len(b) for b in _bytes if b is not None)
+            self.buffer = cast(
+                c_char_p(
+                    b"".join(
+                        [
+                            create_string_buffer(b, buffer_length)
+                            if b is not None
+                            else create_string_buffer(buffer_length)
+                            for b in _bytes
+                        ]
+                    )
+                ),
+                c_void_p,
+            )
+        self.length = (c_int32 * len(values))(*[len(b) if b is not None else 0 for b in _bytes])
+        self.buffer_length = buffer_length
+        self.num = len(values)
+        self.is_null = cast((c_byte * self.num)(*[1 if v == None else 0 for v in values]), c_char_p)
+        self.buffer_type = FieldType.C_NCHAR
+
+    def tinyint_unsigned(self, values):
+        self.buffer_type = FieldType.C_TINYINT_UNSIGNED
+        self.buffer_length = sizeof(c_uint8)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_uint8 * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_TINYINT_UNSIGNED_NULL for v in values])
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+    def smallint_unsigned(self, values):
+        self.buffer_type = FieldType.C_SMALLINT_UNSIGNED
+        self.buffer_length = sizeof(c_uint16)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_uint16 * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_SMALLINT_UNSIGNED_NULL for v in values])
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+    def int_unsigned(self, values):
+        self.buffer_type = FieldType.C_INT_UNSIGNED
+        self.buffer_length = sizeof(c_uint32)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_uint32 * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_INT_UNSIGNED_NULL for v in values])
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+    def bigint_unsigned(self, values):
+        self.buffer_type = FieldType.C_BIGINT_UNSIGNED
+        self.buffer_length = sizeof(c_uint64)
+
+        try:
+            buffer = cast(values, c_void_p)
+        except:
+            buffer_type = c_uint64 * len(values)
+            try:
+                buffer = buffer_type(*values)
+            except:
+                buffer = buffer_type(*[v if v is not None else FieldType.C_BIGINT_UNSIGNED_NULL for v in values])
+        self.buffer = cast(buffer, c_void_p)
+        self.num = len(values)
+
+
+def new_bind_param():
+    # type: () -> TaosBind
+    return TaosBind()
+
+
+def new_bind_params(size):
+    # type: (int) -> Array[TaosBind]
+    return (TaosBind * size)()
+
+
+def new_multi_bind():
+    # type: () -> TaosMultiBind
+    return TaosMultiBind()
+
+
+def new_multi_binds(size):
+    # type: (int) -> Array[TaosMultiBind]
+    return (TaosMultiBind * size)()

src/connector/python/taos/cinterface.py

+# encoding:UTF-8
+
 import ctypes
-from .constants import FieldType
-from .error import *
-import math
-import datetime
 import platform
+import sys
+from ctypes import *
+try:
+    from typing import Any
+except:
+    pass
+
+from .error import *
+from .bind import *
+from .field import *
+
+
+# stream callback
+stream_callback_type = CFUNCTYPE(None, c_void_p, c_void_p, c_void_p)
+stream_callback2_type = CFUNCTYPE(None, c_void_p)
+
+# C interface class
+class TaosOption:
+    Locale = (0,)
+    Charset = (1,)
+    Timezone = (2,)
+    ConfigDir = (3,)
+    ShellActivityTimer = (4,)
+    MaxOptions = (5,)
+
+
+def _load_taos_linux():
+    return ctypes.CDLL("libtaos.so")
+
+
+def _load_taos_darwin():
+    return ctypes.CDLL("libtaos.dylib")
+
+
+def _load_taos_windows():
+    return ctypes.windll.LoadLibrary("taos")
 
 
-def _convert_millisecond_to_datetime(milli):
-    return datetime.datetime.fromtimestamp(0) + datetime.timedelta(seconds=milli/1000.0)
+def _load_taos():
+    load_func = {
+        "Linux": _load_taos_linux,
+        "Darwin": _load_taos_darwin,
+        "Windows": _load_taos_windows,
+    }
+    try:
+        return load_func[platform.system()]()
+    except:
+        sys.exit("unsupported platform to TDengine connector")
 
 
-def _convert_microsecond_to_datetime(micro):
-    return datetime.datetime.fromtimestamp(0) + datetime.timedelta(seconds=micro / 1000000.0)
+_libtaos = _load_taos()
 
+_libtaos.taos_fetch_fields.restype = ctypes.POINTER(TaosField)
+_libtaos.taos_init.restype = None
+_libtaos.taos_connect.restype = ctypes.c_void_p
+_libtaos.taos_fetch_row.restype = ctypes.POINTER(ctypes.c_void_p)
+_libtaos.taos_errstr.restype = ctypes.c_char_p
+_libtaos.taos_subscribe.restype = ctypes.c_void_p
+_libtaos.taos_consume.restype = ctypes.c_void_p
+_libtaos.taos_fetch_lengths.restype = ctypes.POINTER(ctypes.c_int)
+_libtaos.taos_free_result.restype = None
+_libtaos.taos_query.restype = ctypes.POINTER(ctypes.c_void_p)
+try:
+    _libtaos.taos_stmt_errstr.restype = c_char_p
+except AttributeError:
+    None
+finally:
+    None
 
-def _convert_nanosecond_to_datetime(nanosec):
-    return nanosec
 
+_libtaos.taos_options.restype = None
 
-def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C bool row to python row
+
+def taos_options(option, *args):
+    # type: (TaosOption, Any) -> None
+    _libtaos.taos_options(option, *args)
+
+
+def taos_init():
+    # type: () -> None
     """
-    _timestamp_converter = _convert_millisecond_to_datetime
-    if precision == FieldType.C_TIMESTAMP_MILLI:
-        _timestamp_converter = _convert_millisecond_to_datetime
-    elif precision == FieldType.C_TIMESTAMP_MICRO:
-        _timestamp_converter = _convert_microsecond_to_datetime
-    elif precision == FieldType.C_TIMESTAMP_NANO:
-        _timestamp_converter = _convert_nanosecond_to_datetime
-    else:
-        raise DatabaseError("Unknown precision returned from database")
+    C: taos_init
+    """
+    _libtaos.taos_init()
+
+
+_libtaos.taos_cleanup.restype = None
 
-    return [
-        None if ele == FieldType.C_BIGINT_NULL else _timestamp_converter(ele) for ele in ctypes.cast(
-            data, ctypes.POINTER(
-                ctypes.c_int64))[
-            :abs(num_of_rows)]]
 
+def taos_cleanup():
+    # type: () -> None
+    """Cleanup workspace."""
+    _libtaos.taos_cleanup()
 
-def _crow_bool_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C bool row to python row
+
+_libtaos.taos_get_client_info.restype = c_char_p
+
+
+def taos_get_client_info():
+    # type: () -> str
+    """Get client version info.
+    获取客户端版本信息。
     """
-    return [
-        None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(
-            data, ctypes.POINTER(
-                ctypes.c_byte))[
-            :abs(num_of_rows)]]
+    return _libtaos.taos_get_client_info().decode()
+
+
+_libtaos.taos_get_server_info.restype = c_char_p
+_libtaos.taos_get_server_info.argtypes = (c_void_p,)
+
+
+def taos_get_server_info(connection):
+    # type: (c_void_p) -> str
+    return _libtaos.taos_get_server_info(connection).decode()
+
+
+_libtaos.taos_close.restype = None
+_libtaos.taos_close.argtypes = (c_void_p,)
+
+
+def taos_close(connection):
+    # type: (c_void_p) -> None
+    """Close the TAOS* connection"""
+    _libtaos.taos_close(connection)
+
+
+_libtaos.taos_connect.restype = c_void_p
+_libtaos.taos_connect.argtypes = c_char_p, c_char_p, c_char_p, c_char_p, c_uint16
+
+
+def taos_connect(host=None, user="root", password="taosdata", db=None, port=0):
+    # type: (None|str, str, str, None|str, int) -> c_void_p
+    """Create TDengine database connection.
+    创建数据库连接，初始化连接上下文。其中需要用户提供的参数包含：
 
+    - host: server hostname/FQDN, TDengine管理主节点的FQDN
+    - user: user name/用户名
+    - password: user password / 用户密码
+    - db: database name (optional)
+    - port: server port
 
-def _crow_tinyint_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C tinyint row to python row
+    @rtype: c_void_p, TDengine handle
     """
-    return [None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(
-        data, ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)]]
+    # host
+    try:
+        _host = c_char_p(host.encode("utf-8")) if host is not None else None
+    except AttributeError:
+        raise AttributeError("host is expected as a str")
+
+    # user
+    try:
+        _user = c_char_p(user.encode("utf-8"))
+    except AttributeError:
+        raise AttributeError("user is expected as a str")
+
+    # password
+    try:
+        _password = c_char_p(password.encode("utf-8"))
+    except AttributeError:
+        raise AttributeError("password is expected as a str")
+
+    # db
+    try:
+        _db = c_char_p(db.encode("utf-8")) if db is not None else None
+    except AttributeError:
+        raise AttributeError("db is expected as a str")
 
+    # port
+    try:
+        _port = c_uint16(port)
+    except TypeError:
+        raise TypeError("port is expected as an uint16")
 
-def _crow_tinyint_unsigned_to_python(
-        data,
-        num_of_rows,
-        nbytes=None,
-        precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C tinyint row to python row
+    connection = cast(_libtaos.taos_connect(_host, _user, _password, _db, _port), c_void_p)
+
+    if connection.value is None:
+        raise ConnectionError("connect to TDengine failed")
+    return connection
+
+
+_libtaos.taos_connect_auth.restype = c_void_p
+_libtaos.taos_connect_auth.argtypes = c_char_p, c_char_p, c_char_p, c_char_p, c_uint16
+
+
+def taos_connect_auth(host=None, user="root", auth="", db=None, port=0):
+    # type: (None|str, str, str, None|str, int) -> c_void_p
     """
-    return [
-        None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
-            data, ctypes.POINTER(
-                ctypes.c_ubyte))[
-            :abs(num_of_rows)]]
+    创建数据库连接，初始化连接上下文。其中需要用户提供的参数包含：
 
+    - host: server hostname/FQDN, TDengine管理主节点的FQDN
+    - user: user name/用户名
+    - auth: base64 encoded auth token
+    - db: database name (optional)
+    - port: server port
 
-def _crow_smallint_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C smallint row to python row
+    @rtype: c_void_p, TDengine handle
     """
-    return [
-        None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(
-            data, ctypes.POINTER(
-                ctypes.c_short))[
-            :abs(num_of_rows)]]
+    # host
+    try:
+        _host = c_char_p(host.encode("utf-8")) if host is not None else None
+    except AttributeError:
+        raise AttributeError("host is expected as a str")
 
+    # user
+    try:
+        _user = c_char_p(user.encode("utf-8"))
+    except AttributeError:
+        raise AttributeError("user is expected as a str")
+
+    # auth
+    try:
+        _auth = c_char_p(auth.encode("utf-8"))
+    except AttributeError:
+        raise AttributeError("password is expected as a str")
+
+    # db
+    try:
+        _db = c_char_p(db.encode("utf-8")) if db is not None else None
+    except AttributeError:
+        raise AttributeError("db is expected as a str")
+
+    # port
+    try:
+        _port = c_int(port)
+    except TypeError:
+        raise TypeError("port is expected as an int")
+
+    connection = c_void_p(_libtaos.taos_connect_auth(_host, _user, _auth, _db, _port))
+
+    if connection.value is None:
+        raise ConnectionError("connect to TDengine failed")
+    return connection
+
+
+_libtaos.taos_query.restype = c_void_p
+_libtaos.taos_query.argtypes = c_void_p, c_char_p
+
+
+def taos_query(connection, sql):
+    # type: (c_void_p, str) -> c_void_p
+    """Run SQL
+
+    - sql: str, sql string to run
+
+    @return: TAOS_RES*, result pointer
 
-def _crow_smallint_unsigned_to_python(
-        data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C smallint row to python row
     """
-    return [
-        None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
-            data, ctypes.POINTER(
-                ctypes.c_ushort))[
-            :abs(num_of_rows)]]
+    try:
+        ptr = c_char_p(sql.encode("utf-8"))
+        res = c_void_p(_libtaos.taos_query(connection, ptr))
+        errno = taos_errno(res)
+        if errno != 0:
+            errstr = taos_errstr(res)
+            taos_free_result(res)
+            raise ProgrammingError(errstr, errno)
+        return res
+    except AttributeError:
+        raise AttributeError("sql is expected as a string")
 
 
-def _crow_int_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C int row to python row
+async_query_callback_type = CFUNCTYPE(None, c_void_p, c_void_p, c_int)
+_libtaos.taos_query_a.restype = None
+_libtaos.taos_query_a.argtypes = c_void_p, c_char_p, async_query_callback_type, c_void_p
+
+
+def taos_query_a(connection, sql, callback, param):
+    # type: (c_void_p, str, async_query_callback_type, c_void_p) -> c_void_p
+    _libtaos.taos_query_a(connection, c_char_p(sql.encode("utf-8")), async_query_callback_type(callback), param)
+
+
+async_fetch_rows_callback_type = CFUNCTYPE(None, c_void_p, c_void_p, c_int)
+_libtaos.taos_fetch_rows_a.restype = None
+_libtaos.taos_fetch_rows_a.argtypes = c_void_p, async_fetch_rows_callback_type, c_void_p
+
+
+def taos_fetch_rows_a(result, callback, param):
+    # type: (c_void_p, async_fetch_rows_callback_type, c_void_p) -> c_void_p
+    _libtaos.taos_fetch_rows_a(result, async_fetch_rows_callback_type(callback), param)
+
+
+def taos_affected_rows(result):
+    # type: (c_void_p) -> c_int
+    """The affected rows after runing query"""
+    return _libtaos.taos_affected_rows(result)
+
+
+subscribe_callback_type = CFUNCTYPE(None, c_void_p, c_void_p, c_void_p, c_int)
+_libtaos.taos_subscribe.restype = c_void_p
+# _libtaos.taos_subscribe.argtypes = c_void_p, c_int, c_char_p, c_char_p, subscribe_callback_type, c_void_p, c_int
+
+
+def taos_subscribe(connection, restart, topic, sql, interval, callback=None, param=None):
+    # type: (c_void_p, bool, str, str, c_int, subscribe_callback_type, c_void_p | None) -> c_void_p
+    """Create a subscription
+    @restart boolean,
+    @sql string, sql statement for data query, must be a 'select' statement.
+    @topic string, name of this subscription
     """
-    return [None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(
-        data, ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)]]
+    if callback != None:
+        callback = subscribe_callback_type(callback)
+    if param != None:
+        param = c_void_p(param)
+    return c_void_p(
+        _libtaos.taos_subscribe(
+            connection,
+            1 if restart else 0,
+            c_char_p(topic.encode("utf-8")),
+            c_char_p(sql.encode("utf-8")),
+            callback or None,
+            param,
+            interval,
+        )
+    )
+
+
+_libtaos.taos_consume.restype = c_void_p
+_libtaos.taos_consume.argstype = c_void_p,
+
+
+def taos_consume(sub):
+    """Consume data of a subscription"""
+    return c_void_p(_libtaos.taos_consume(sub))
+
+
+_libtaos.taos_unsubscribe.restype = None
+_libtaos.taos_unsubscribe.argstype = c_void_p, c_int
+
+
+def taos_unsubscribe(sub, keep_progress):
+    """Cancel a subscription"""
+    _libtaos.taos_unsubscribe(sub, 1 if keep_progress else 0)
+
+
+def taos_use_result(result):
+    """Use result after calling self.query, it's just for 1.6."""
+    fields = []
+    pfields = taos_fetch_fields_raw(result)
+    for i in range(taos_field_count(result)):
+        fields.append(
+            {
+                "name": pfields[i].name,
+                "bytes": pfields[i].bytes,
+                "type": pfields[i].type,
+            }
+        )
+
+    return fields
+
+
+_libtaos.taos_fetch_block.restype = c_int
+_libtaos.taos_fetch_block.argtypes = c_void_p, c_void_p
+
+
+def taos_fetch_block_raw(result):
+    pblock = ctypes.c_void_p(0)
+    num_of_rows = _libtaos.taos_fetch_block(result, ctypes.byref(pblock))
+    if num_of_rows == 0:
+        return None, 0
+    return pblock, abs(num_of_rows)
+
+
+def taos_fetch_block(result, fields=None, field_count=None):
+    pblock = ctypes.c_void_p(0)
+    num_of_rows = _libtaos.taos_fetch_block(result, ctypes.byref(pblock))
+    if num_of_rows == 0:
+        return None, 0
+    precision = taos_result_precision(result)
+    if fields == None:
+        fields = taos_fetch_fields(result)
+    if field_count == None:
+        field_count = taos_field_count(result)
+    blocks = [None] * field_count
+    fieldLen = taos_fetch_lengths(result, field_count)
+    for i in range(len(fields)):
+        data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
+        if fields[i]["type"] not in CONVERT_FUNC:
+            raise DatabaseError("Invalid data type returned from database")
+        blocks[i] = CONVERT_FUNC_BLOCK[fields[i]["type"]](data, num_of_rows, fieldLen[i], precision)
+
+    return blocks, abs(num_of_rows)
+
+
+_libtaos.taos_fetch_row.restype = c_void_p
+_libtaos.taos_fetch_row.argtypes = (c_void_p,)
+
+
+def taos_fetch_row_raw(result):
+    # type: (c_void_p) -> c_void_p
+    row = c_void_p(_libtaos.taos_fetch_row(result))
+    if row:
+        return row
+    return None
+
+
+def taos_fetch_row(result, fields):
+    # type: (c_void_p, Array[TaosField]) -> tuple(c_void_p, int)
+    pblock = ctypes.c_void_p(0)
+    pblock = taos_fetch_row_raw(result)
+    if pblock:
+        num_of_rows = 1
+        precision = taos_result_precision(result)
+        field_count = taos_field_count(result)
+        blocks = [None] * field_count
+        field_lens = taos_fetch_lengths(result, field_count)
+        for i in range(field_count):
+            data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
+            if fields[i].type not in CONVERT_FUNC:
+                raise DatabaseError("Invalid data type returned from database")
+            if data is None:
+                blocks[i] = [None]
+            else:
+                blocks[i] = CONVERT_FUNC[fields[i].type](data, num_of_rows, field_lens[i], precision)
+    else:
+        return None, 0
+    return blocks, abs(num_of_rows)
+
+
+_libtaos.taos_free_result.argtypes = (c_void_p,)
 
 
-def _crow_int_unsigned_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C int row to python row
+def taos_free_result(result):
+    # type: (c_void_p) -> None
+    if result != None:
+        _libtaos.taos_free_result(result)
+
+
+_libtaos.taos_field_count.restype = c_int
+_libtaos.taos_field_count.argstype = (c_void_p,)
+
+
+def taos_field_count(result):
+    # type: (c_void_p) -> int
+    return _libtaos.taos_field_count(result)
+
+
+def taos_num_fields(result):
+    # type: (c_void_p) -> int
+    return _libtaos.taos_num_fields(result)
+
+
+_libtaos.taos_fetch_fields.restype = c_void_p
+_libtaos.taos_fetch_fields.argstype = (c_void_p,)
+
+
+def taos_fetch_fields_raw(result):
+    # type: (c_void_p) -> c_void_p
+    return c_void_p(_libtaos.taos_fetch_fields(result))
+
+
+def taos_fetch_fields(result):
+    # type: (c_void_p) -> TaosFields
+    fields = taos_fetch_fields_raw(result)
+    count = taos_field_count(result)
+    return TaosFields(fields, count)
+
+
+def taos_fetch_lengths(result, field_count=None):
+    # type: (c_void_p, int) -> Array[int]
+    """Make sure to call taos_fetch_row or taos_fetch_block before fetch_lengths"""
+    lens = _libtaos.taos_fetch_lengths(result)
+    if field_count == None:
+        field_count = taos_field_count(result)
+    if not lens:
+        raise OperationalError("field length empty, use taos_fetch_row/block before it")
+    return lens[:field_count]
+
+
+def taos_result_precision(result):
+    # type: (c_void_p) -> c_int
+    return _libtaos.taos_result_precision(result)
+
+
+_libtaos.taos_errno.restype = c_int
+_libtaos.taos_errno.argstype = (c_void_p,)
+
+
+def taos_errno(result):
+    # type: (ctypes.c_void_p) -> c_int
+    """Return the error number."""
+    return _libtaos.taos_errno(result)
+
+
+_libtaos.taos_errstr.restype = c_char_p
+_libtaos.taos_errstr.argstype = (c_void_p,)
+
+
+def taos_errstr(result=c_void_p(None)):
+    # type: (ctypes.c_void_p) -> str
+    """Return the error styring"""
+    return _libtaos.taos_errstr(result).decode("utf-8")
+
+
+_libtaos.taos_stop_query.restype = None
+_libtaos.taos_stop_query.argstype = (c_void_p,)
+
+
+def taos_stop_query(result):
+    # type: (ctypes.c_void_p) -> None
+    """Stop current query"""
+    return _libtaos.taos_stop_query(result)
+
+
+_libtaos.taos_load_table_info.restype = c_int
+_libtaos.taos_load_table_info.argstype = (c_void_p, c_char_p)
+
+
+def taos_load_table_info(connection, tables):
+    # type: (ctypes.c_void_p, str) -> None
+    """Stop current query"""
+    errno = _libtaos.taos_load_table_info(connection, c_char_p(tables.encode("utf-8")))
+    if errno != 0:
+        msg = taos_errstr()
+        raise OperationalError(msg, errno)
+
+
+_libtaos.taos_validate_sql.restype = c_int
+_libtaos.taos_validate_sql.argstype = (c_void_p, c_char_p)
+
+
+def taos_validate_sql(connection, sql):
+    # type: (ctypes.c_void_p, str) -> None | str
+    """Get taosd server info"""
+    errno = _libtaos.taos_validate_sql(connection, ctypes.c_char_p(sql.encode("utf-8")))
+    if errno != 0:
+        msg = taos_errstr()
+        return msg
+    return None
+
+
+_libtaos.taos_print_row.restype = c_int
+_libtaos.taos_print_row.argstype = (c_char_p, c_void_p, c_void_p, c_int)
+
+
+def taos_print_row(row, fields, num_fields, buffer_size=4096):
+    # type: (ctypes.c_void_p, ctypes.c_void_p | TaosFields, int, int) -> str
+    """Print an row to string"""
+    p = ctypes.create_string_buffer(buffer_size)
+    if isinstance(fields, TaosFields):
+        _libtaos.taos_print_row(p, row, fields.as_ptr(), num_fields)
+    else:
+        _libtaos.taos_print_row(p, row, fields, num_fields)
+    if p:
+        return p.value.decode("utf-8")
+    raise OperationalError("taos_print_row failed")
+
+
+_libtaos.taos_select_db.restype = c_int
+_libtaos.taos_select_db.argstype = (c_void_p, c_char_p)
+
+
+def taos_select_db(connection, db):
+    # type: (ctypes.c_void_p, str) -> None
+    """Select database, eq to sql: use <db>"""
+    res = _libtaos.taos_select_db(connection, ctypes.c_char_p(db.encode("utf-8")))
+    if res != 0:
+        raise DatabaseError("select database error", res)
+
+
+try:
+    _libtaos.taos_open_stream.restype = c_void_p
+    _libtaos.taos_open_stream.argstype = c_void_p, c_char_p, stream_callback_type, c_int64, c_void_p, Any
+except:
+    pass
+
+
+def taos_open_stream(connection, sql, callback, stime=0, param=None, callback2=None):
+    # type: (ctypes.c_void_p, str, stream_callback_type, c_int64, c_void_p, c_void_p) -> ctypes.pointer
+    if callback2 != None:
+        callback2 = stream_callback2_type(callback2)
+    """Open an stream"""
+    return c_void_p(
+        _libtaos.taos_open_stream(
+            connection, ctypes.c_char_p(sql.encode("utf-8")), stream_callback_type(callback), stime, param, callback2
+        )
+    )
+
+
+_libtaos.taos_close_stream.restype = None
+_libtaos.taos_close_stream.argstype = (c_void_p,)
+
+
+def taos_close_stream(stream):
+    # type: (c_void_p) -> None
+    """Open an stream"""
+    return _libtaos.taos_close_stream(stream)
+
+
+_libtaos.taos_stmt_init.restype = c_void_p
+_libtaos.taos_stmt_init.argstype = (c_void_p,)
+
+
+def taos_stmt_init(connection):
+    # type: (c_void_p) -> (c_void_p)
+    """Create a statement query
+    @param(connection): c_void_p TAOS*
+    @rtype: c_void_p, *TAOS_STMT
+    """
+    return c_void_p(_libtaos.taos_stmt_init(connection))
+
+
+_libtaos.taos_stmt_prepare.restype = c_int
+_libtaos.taos_stmt_prepare.argstype = (c_void_p, c_char_p, c_int)
+
+
+def taos_stmt_prepare(stmt, sql):
+    # type: (ctypes.c_void_p, str) -> None
+    """Prepare a statement query
+    @stmt: c_void_p TAOS_STMT*
     """
-    return [
-        None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
-            data, ctypes.POINTER(
-                ctypes.c_uint))[
-            :abs(num_of_rows)]]
+    buffer = sql.encode("utf-8")
+    res = _libtaos.taos_stmt_prepare(stmt, ctypes.c_char_p(buffer), len(buffer))
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
+
 
+_libtaos.taos_stmt_close.restype = c_int
+_libtaos.taos_stmt_close.argstype = (c_void_p,)
 
-def _crow_bigint_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C bigint row to python row
+
+def taos_stmt_close(stmt):
+    # type: (ctypes.c_void_p) -> None
+    """Close a statement query
+    @stmt: c_void_p TAOS_STMT*
     """
-    return [None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(
-        data, ctypes.POINTER(ctypes.c_int64))[:abs(num_of_rows)]]
+    res = _libtaos.taos_stmt_close(stmt)
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
+
 
+try:
+    _libtaos.taos_stmt_errstr.restype = c_char_p
+    _libtaos.taos_stmt_errstr.argstype = (c_void_p,)
+except AttributeError:
+    print("WARNING: libtaos(%s) does not support taos_stmt_errstr" % taos_get_client_info())
 
-def _crow_bigint_unsigned_to_python(
-        data,
-        num_of_rows,
-        nbytes=None,
-        precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C bigint row to python row
+
+def taos_stmt_errstr(stmt):
+    # type: (ctypes.c_void_p) -> str
+    """Get error message from stetement query
+    @stmt: c_void_p TAOS_STMT*
     """
-    return [
-        None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
-            data, ctypes.POINTER(
-                ctypes.c_uint64))[
-            :abs(num_of_rows)]]
+    err = c_char_p(_libtaos.taos_stmt_errstr(stmt))
+    if err:
+        return err.value.decode("utf-8")
+
+try:
+    _libtaos.taos_stmt_set_tbname.restype = c_int
+    _libtaos.taos_stmt_set_tbname.argstype = (c_void_p, c_char_p)
+except AttributeError:
+    print("WARNING: libtaos(%s) does not support taos_stmt_set_tbname" % taos_get_client_info())
 
 
-def _crow_float_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C float row to python row
+
+def taos_stmt_set_tbname(stmt, name):
+    # type: (ctypes.c_void_p, str) -> None
+    """Set table name of a statement query if exists.
+    @stmt: c_void_p TAOS_STMT*
     """
-    return [None if math.isnan(ele) else ele for ele in ctypes.cast(
-        data, ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)]]
+    res = _libtaos.taos_stmt_set_tbname(stmt, c_char_p(name.encode("utf-8")))
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
+
+try:
+    _libtaos.taos_stmt_set_tbname_tags.restype = c_int
+    _libtaos.taos_stmt_set_tbname_tags.argstype = (c_void_p, c_char_p, c_void_p)
+except AttributeError:
+    print("WARNING: libtaos(%s) does not support taos_stmt_set_tbname_tags" % taos_get_client_info())
+
+
+
+def taos_stmt_set_tbname_tags(stmt, name, tags):
+    # type: (c_void_p, str, c_void_p) -> None
+    """Set table name with tags bind params.
+    @stmt: c_void_p TAOS_STMT*
+    """
+    res = _libtaos.taos_stmt_set_tbname_tags(stmt, ctypes.c_char_p(name.encode("utf-8")), tags)
+
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
 
 
-def _crow_double_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C double row to python row
+_libtaos.taos_stmt_is_insert.restype = c_int
+_libtaos.taos_stmt_is_insert.argstype = (c_void_p, POINTER(c_int))
+
+
+def taos_stmt_is_insert(stmt):
+    # type: (ctypes.c_void_p) -> bool
+    """Set table name with tags bind params.
+    @stmt: c_void_p TAOS_STMT*
     """
-    return [None if math.isnan(ele) else ele for ele in ctypes.cast(
-        data, ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)]]
+    is_insert = ctypes.c_int()
+    res = _libtaos.taos_stmt_is_insert(stmt, ctypes.byref(is_insert))
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
+    return is_insert == 0
+
+
+_libtaos.taos_stmt_num_params.restype = c_int
+_libtaos.taos_stmt_num_params.argstype = (c_void_p, POINTER(c_int))
 
 
-def _crow_binary_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C binary row to python row
+def taos_stmt_num_params(stmt):
+    # type: (ctypes.c_void_p) -> int
+    """Params number of the current statement query.
+    @stmt: TAOS_STMT*
     """
-    assert(nbytes is not None)
-    return [None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode(
-        'utf-8') for ele in (ctypes.cast(data, ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+    num_params = ctypes.c_int()
+    res = _libtaos.taos_stmt_num_params(stmt, ctypes.byref(num_params))
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
+    return num_params.value
 
 
-def _crow_nchar_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C nchar row to python row
+_libtaos.taos_stmt_bind_param.restype = c_int
+_libtaos.taos_stmt_bind_param.argstype = (c_void_p, c_void_p)
+
+
+def taos_stmt_bind_param(stmt, bind):
+    # type: (ctypes.c_void_p, Array[TaosBind]) -> None
+    """Bind params in the statement query.
+    @stmt: TAOS_STMT*
+    @bind: TAOS_BIND*
     """
-    assert(nbytes is not None)
-    res = []
-    for i in range(abs(num_of_rows)):
-        try:
-            if num_of_rows >= 0:
-                tmpstr = ctypes.c_char_p(data)
-                res.append(tmpstr.value.decode())
-            else:
-                res.append((ctypes.cast(data + nbytes * i,
-                                        ctypes.POINTER(ctypes.c_wchar * (nbytes // 4))))[0].value)
-        except ValueError:
-            res.append(None)
+    # ptr = ctypes.cast(bind, POINTER(TaosBind))
+    # ptr = pointer(bind)
+    res = _libtaos.taos_stmt_bind_param(stmt, bind)
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
+
+try:
+    _libtaos.taos_stmt_bind_param_batch.restype = c_int
+    _libtaos.taos_stmt_bind_param_batch.argstype = (c_void_p, c_void_p)
+except AttributeError:
+    print("WARNING: libtaos(%s) does not support taos_stmt_bind_param_batch" % taos_get_client_info())
 
-    return res
 
 
-def _crow_binary_to_python_block(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C binary row to python row
+def taos_stmt_bind_param_batch(stmt, bind):
+    # type: (ctypes.c_void_p, Array[TaosMultiBind]) -> None
+    """Bind params in the statement query.
+    @stmt: TAOS_STMT*
+    @bind: TAOS_BIND*
     """
-    assert(nbytes is not None)
-    res = []
-    for i in range(abs(num_of_rows)):
-        try:
-            rbyte = ctypes.cast(
-                data + nbytes * i,
-                ctypes.POINTER(
-                    ctypes.c_short))[
-                :1].pop()
-            tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
-            res.append(tmpstr.value.decode()[0:rbyte])
-        except ValueError:
-            res.append(None)
-    return res
-
-
-def _crow_nchar_to_python_block(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
-    """Function to convert C nchar row to python row
+    # ptr = ctypes.cast(bind, POINTER(TaosMultiBind))
+    # ptr = pointer(bind)
+    res = _libtaos.taos_stmt_bind_param_batch(stmt, bind)
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
+
+try:
+    _libtaos.taos_stmt_bind_single_param_batch.restype = c_int
+    _libtaos.taos_stmt_bind_single_param_batch.argstype = (c_void_p, c_void_p, c_int)
+except AttributeError:
+    print("WARNING: libtaos(%s) does not support taos_stmt_bind_single_param_batch" % taos_get_client_info())
+
+
+def taos_stmt_bind_single_param_batch(stmt, bind, col):
+    # type: (ctypes.c_void_p, Array[TaosMultiBind], c_int) -> None
+    """Bind params in the statement query.
+    @stmt: TAOS_STMT*
+    @bind: TAOS_MULTI_BIND*
+    @col: column index
     """
-    assert(nbytes is not None)
-    res = []
-    for i in range(abs(num_of_rows)):
-        try:
-            tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
-            res.append(tmpstr.value.decode())
-        except ValueError:
-            res.append(None)
-    return res
-
-
-_CONVERT_FUNC = {
-    FieldType.C_BOOL: _crow_bool_to_python,
-    FieldType.C_TINYINT: _crow_tinyint_to_python,
-    FieldType.C_SMALLINT: _crow_smallint_to_python,
-    FieldType.C_INT: _crow_int_to_python,
-    FieldType.C_BIGINT: _crow_bigint_to_python,
-    FieldType.C_FLOAT: _crow_float_to_python,
-    FieldType.C_DOUBLE: _crow_double_to_python,
-    FieldType.C_BINARY: _crow_binary_to_python,
-    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
-    FieldType.C_NCHAR: _crow_nchar_to_python,
-    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
-    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
-    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
-    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python
-}
-
-_CONVERT_FUNC_BLOCK = {
-    FieldType.C_BOOL: _crow_bool_to_python,
-    FieldType.C_TINYINT: _crow_tinyint_to_python,
-    FieldType.C_SMALLINT: _crow_smallint_to_python,
-    FieldType.C_INT: _crow_int_to_python,
-    FieldType.C_BIGINT: _crow_bigint_to_python,
-    FieldType.C_FLOAT: _crow_float_to_python,
-    FieldType.C_DOUBLE: _crow_double_to_python,
-    FieldType.C_BINARY: _crow_binary_to_python_block,
-    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
-    FieldType.C_NCHAR: _crow_nchar_to_python_block,
-    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
-    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
-    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
-    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python
-}
-
-# Corresponding TAOS_FIELD structure in C
-
-
-class TaosField(ctypes.Structure):
-    _fields_ = [('name', ctypes.c_char * 65),
-                ('type', ctypes.c_char),
-                ('bytes', ctypes.c_short)]
+    res = _libtaos.taos_stmt_bind_single_param_batch(stmt, bind, col)
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
 
-# C interface class
 
+_libtaos.taos_stmt_add_batch.restype = c_int
+_libtaos.taos_stmt_add_batch.argstype = (c_void_p,)
 
-def _load_taos_linux():
-    return ctypes.CDLL('libtaos.so')
 
+def taos_stmt_add_batch(stmt):
+    # type: (ctypes.c_void_p) -> None
+    """Add current params into batch
+    @stmt: TAOS_STMT*
+    """
+    res = _libtaos.taos_stmt_add_batch(stmt)
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
 
-def _load_taos_darwin():
-    return ctypes.CDLL('libtaos.dylib')
 
+_libtaos.taos_stmt_execute.restype = c_int
+_libtaos.taos_stmt_execute.argstype = (c_void_p,)
 
-def _load_taos_windows():
-    return ctypes.windll.LoadLibrary('taos')
 
+def taos_stmt_execute(stmt):
+    # type: (ctypes.c_void_p) -> None
+    """Execute a statement query
+    @stmt: TAOS_STMT*
+    """
+    res = _libtaos.taos_stmt_execute(stmt)
+    if res != 0:
+        raise StatementError(msg=taos_stmt_errstr(stmt), errno=res)
 
-def _load_taos():
-    load_func = {
-        'Linux': _load_taos_linux,
-        'Darwin': _load_taos_darwin,
-        'Windows': _load_taos_windows,
-    }
-    try:
-        return load_func[platform.system()]()
-    except:
-        sys.exit('unsupported platform to TDengine connector')
 
+_libtaos.taos_stmt_use_result.restype = c_void_p
+_libtaos.taos_stmt_use_result.argstype = (c_void_p,)
 
-class CTaosInterface(object):
 
-    libtaos = _load_taos()
-
-    libtaos.taos_fetch_fields.restype = ctypes.POINTER(TaosField)
-    libtaos.taos_init.restype = None
-    libtaos.taos_connect.restype = ctypes.c_void_p
-    # libtaos.taos_use_result.restype = ctypes.c_void_p
-    libtaos.taos_fetch_row.restype = ctypes.POINTER(ctypes.c_void_p)
-    libtaos.taos_errstr.restype = ctypes.c_char_p
-    libtaos.taos_subscribe.restype = ctypes.c_void_p
-    libtaos.taos_consume.restype = ctypes.c_void_p
-    libtaos.taos_fetch_lengths.restype = ctypes.c_void_p
-    libtaos.taos_free_result.restype = None
-    libtaos.taos_errno.restype = ctypes.c_int
-    libtaos.taos_query.restype = ctypes.POINTER(ctypes.c_void_p)
+def taos_stmt_use_result(stmt):
+    # type: (ctypes.c_void_p) -> None
+    """Get result of the statement.
+    @stmt: TAOS_STMT*
+    """
+    result = c_void_p(_libtaos.taos_stmt_use_result(stmt))
+    if result == None:
+        raise StatementError(taos_stmt_errstr(stmt))
+    return result
+
+try:
+    _libtaos.taos_insert_lines.restype = c_int
+    _libtaos.taos_insert_lines.argstype = c_void_p, c_void_p, c_int
+except AttributeError:
+    print("WARNING: libtaos(%s) does not support insert_lines" % taos_get_client_info())
 
+
+
+
+def taos_insert_lines(connection, lines):
+    # type: (c_void_p, list[str] | tuple(str)) -> None
+    num_of_lines = len(lines)
+    lines = (c_char_p(line.encode("utf-8")) for line in lines)
+    lines_type = ctypes.c_char_p * num_of_lines
+    p_lines = lines_type(*lines)
+    errno = _libtaos.taos_insert_lines(connection, p_lines, num_of_lines)
+    if errno != 0:
+        raise LinesError("insert lines error", errno)
+
+
+class CTaosInterface(object):
     def __init__(self, config=None):
-        '''
+        """
         Function to initialize the class
         @host     : str, hostname to connect
         @user     : str, username to connect to server
@@ -298,304 +842,46 @@ class CTaosInterface(object):
         @config   : str, config directory
 
         @rtype    : None
-        '''
+        """
         if config is None:
             self._config = ctypes.c_char_p(None)
         else:
             try:
-                self._config = ctypes.c_char_p(config.encode('utf-8'))
+                self._config = ctypes.c_char_p(config.encode("utf-8"))
             except AttributeError:
                 raise AttributeError("config is expected as a str")
 
         if config is not None:
-            CTaosInterface.libtaos.taos_options(3, self._config)
+            taos_options(3, self._config)
 
-        CTaosInterface.libtaos.taos_init()
+        taos_init()
 
     @property
     def config(self):
-        """ Get current config
-        """
+        """Get current config"""
         return self._config
 
-    def connect(
-            self,
-            host=None,
-            user="root",
-            password="taosdata",
-            db=None,
-            port=0):
-        '''
+    def connect(self, host=None, user="root", password="taosdata", db=None, port=0):
+        """
         Function to connect to server
 
         @rtype: c_void_p, TDengine handle
-        '''
-        # host
-        try:
-            _host = ctypes.c_char_p(host.encode(
-                "utf-8")) if host is not None else ctypes.c_char_p(None)
-        except AttributeError:
-            raise AttributeError("host is expected as a str")
-
-        # user
-        try:
-            _user = ctypes.c_char_p(user.encode("utf-8"))
-        except AttributeError:
-            raise AttributeError("user is expected as a str")
-
-        # password
-        try:
-            _password = ctypes.c_char_p(password.encode("utf-8"))
-        except AttributeError:
-            raise AttributeError("password is expected as a str")
-
-        # db
-        try:
-            _db = ctypes.c_char_p(
-                db.encode("utf-8")) if db is not None else ctypes.c_char_p(None)
-        except AttributeError:
-            raise AttributeError("db is expected as a str")
-
-        # port
-        try:
-            _port = ctypes.c_int(port)
-        except TypeError:
-            raise TypeError("port is expected as an int")
-
-        connection = ctypes.c_void_p(CTaosInterface.libtaos.taos_connect(
-            _host, _user, _password, _db, _port))
-
-        if connection.value is None:
-            print('connect to TDengine failed')
-            raise ConnectionError("connect to TDengine failed")
-            # sys.exit(1)
-        # else:
-        #    print('connect to TDengine success')
-
-        return connection
-
-    @staticmethod
-    def close(connection):
-        '''Close the TDengine handle
-        '''
-        CTaosInterface.libtaos.taos_close(connection)
-        # print('connection is closed')
-
-    @staticmethod
-    def query(connection, sql):
-        '''Run SQL
-
-        @sql: str, sql string to run
-
-        @rtype: 0 on success and -1 on failure
-        '''
-        try:
-            return CTaosInterface.libtaos.taos_query(
-                connection, ctypes.c_char_p(sql.encode('utf-8')))
-        except AttributeError:
-            raise AttributeError("sql is expected as a string")
-        # finally:
-        #     CTaosInterface.libtaos.close(connection)
-
-    @staticmethod
-    def affectedRows(result):
-        """The affected rows after runing query
-        """
-        return CTaosInterface.libtaos.taos_affected_rows(result)
-
-    @staticmethod
-    def insertLines(connection, lines):
-        '''
-            insert through lines protocol
-            @lines: list of str
-            @rtype: tsdb error codes 
-        '''
-        numLines = len(lines)
-        c_lines_type = ctypes.c_char_p*numLines
-        c_lines = c_lines_type()
-        for i in range(numLines):
-            c_lines[i] = ctypes.c_char_p(lines[i].encode('utf-8'))
-        return CTaosInterface.libtaos.taos_insert_lines(connection, c_lines, ctypes.c_int(numLines))
-
-    @staticmethod
-    def subscribe(connection, restart, topic, sql, interval):
-        """Create a subscription
-         @restart boolean,
-         @sql string, sql statement for data query, must be a 'select' statement.
-         @topic string, name of this subscription
-        """
-        return ctypes.c_void_p(CTaosInterface.libtaos.taos_subscribe(
-            connection,
-            1 if restart else 0,
-            ctypes.c_char_p(topic.encode('utf-8')),
-            ctypes.c_char_p(sql.encode('utf-8')),
-            None,
-            None,
-            interval))
-
-    @staticmethod
-    def consume(sub):
-        """Consume data of a subscription
-        """
-        result = ctypes.c_void_p(CTaosInterface.libtaos.taos_consume(sub))
-        fields = []
-        pfields = CTaosInterface.fetchFields(result)
-        for i in range(CTaosInterface.libtaos.taos_num_fields(result)):
-            fields.append({'name': pfields[i].name.decode('utf-8'),
-                           'bytes': pfields[i].bytes,
-                           'type': ord(pfields[i].type)})
-        return result, fields
-
-    @staticmethod
-    def unsubscribe(sub, keepProgress):
-        """Cancel a subscription
-        """
-        CTaosInterface.libtaos.taos_unsubscribe(sub, 1 if keepProgress else 0)
-
-    @staticmethod
-    def useResult(result):
-        '''Use result after calling self.query
-        '''
-        fields = []
-        pfields = CTaosInterface.fetchFields(result)
-        for i in range(CTaosInterface.fieldsCount(result)):
-            fields.append({'name': pfields[i].name.decode('utf-8'),
-                           'bytes': pfields[i].bytes,
-                           'type': ord(pfields[i].type)})
-
-        return fields
-
-    @staticmethod
-    def fetchBlock(result, fields):
-        pblock = ctypes.c_void_p(0)
-        num_of_rows = CTaosInterface.libtaos.taos_fetch_block(
-            result, ctypes.byref(pblock))
-        if num_of_rows == 0:
-            return None, 0
-        precision = CTaosInterface.libtaos.taos_result_precision(result)
-        blocks = [None] * len(fields)
-        fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
-        fieldLen = [
-            ele for ele in ctypes.cast(
-                fieldL, ctypes.POINTER(
-                    ctypes.c_int))[
-                :len(fields)]]
-        for i in range(len(fields)):
-            data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
-            if fields[i]['type'] not in _CONVERT_FUNC_BLOCK:
-                raise DatabaseError("Invalid data type returned from database")
-            blocks[i] = _CONVERT_FUNC_BLOCK[fields[i]['type']](
-                data, num_of_rows, fieldLen[i], precision)
-
-        return blocks, abs(num_of_rows)
-
-    @staticmethod
-    def fetchRow(result, fields):
-        pblock = ctypes.c_void_p(0)
-        pblock = CTaosInterface.libtaos.taos_fetch_row(result)
-        if pblock:
-            num_of_rows = 1
-            precision = CTaosInterface.libtaos.taos_result_precision(result)
-            blocks = [None] * len(fields)
-            fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
-            fieldLen = [
-                ele for ele in ctypes.cast(
-                    fieldL, ctypes.POINTER(
-                        ctypes.c_int))[
-                    :len(fields)]]
-            for i in range(len(fields)):
-                data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
-                if fields[i]['type'] not in _CONVERT_FUNC:
-                    raise DatabaseError(
-                        "Invalid data type returned from database")
-                if data is None:
-                    blocks[i] = [None]
-                else:
-                    blocks[i] = _CONVERT_FUNC[fields[i]['type']](
-                        data, num_of_rows, fieldLen[i], precision)
-        else:
-            return None, 0
-        return blocks, abs(num_of_rows)
-
-    @staticmethod
-    def freeResult(result):
-        CTaosInterface.libtaos.taos_free_result(result)
-        result.value = None
-
-    @staticmethod
-    def fieldsCount(result):
-        return CTaosInterface.libtaos.taos_field_count(result)
-
-    @staticmethod
-    def fetchFields(result):
-        return CTaosInterface.libtaos.taos_fetch_fields(result)
-
-    # @staticmethod
-    # def fetchRow(result, fields):
-    #     l = []
-    #     row = CTaosInterface.libtaos.taos_fetch_row(result)
-    #     if not row:
-    #         return None
-
-    #     for i in range(len(fields)):
-    #         l.append(CTaosInterface.getDataValue(
-    #             row[i], fields[i]['type'], fields[i]['bytes']))
-
-    #     return tuple(l)
-
-    # @staticmethod
-    # def getDataValue(data, dtype, byte):
-    #     '''
-    #     '''
-    #     if not data:
-    #         return None
-
-    #     if (dtype == CTaosInterface.TSDB_DATA_TYPE_BOOL):
-    #         return ctypes.cast(data,  ctypes.POINTER(ctypes.c_bool))[0]
-    #     elif (dtype == CTaosInterface.TSDB_DATA_TYPE_TINYINT):
-    #         return ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[0]
-    #     elif (dtype == CTaosInterface.TSDB_DATA_TYPE_SMALLINT):
-    #         return ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[0]
-    #     elif (dtype == CTaosInterface.TSDB_DATA_TYPE_INT):
-    #         return ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[0]
-    #     elif (dtype == CTaosInterface.TSDB_DATA_TYPE_BIGINT):
-    #         return ctypes.cast(data,  ctypes.POINTER(ctypes.c_int64))[0]
-    #     elif (dtype == CTaosInterface.TSDB_DATA_TYPE_FLOAT):
-    #         return ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[0]
-    #     elif (dtype == CTaosInterface.TSDB_DATA_TYPE_DOUBLE):
-    #         return ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[0]
-    #     elif (dtype == CTaosInterface.TSDB_DATA_TYPE_BINARY):
-    #         return (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char))[0:byte]).rstrip('\x00')
-    #     elif (dtype == CTaosInterface.TSDB_DATA_TYPE_TIMESTAMP):
-    #         return ctypes.cast(data,  ctypes.POINTER(ctypes.c_int64))[0]
-    #     elif (dtype == CTaosInterface.TSDB_DATA_TYPE_NCHAR):
-    #         return (ctypes.cast(data,  ctypes.c_char_p).value).rstrip('\x00')
-
-    @staticmethod
-    def errno(result):
-        """Return the error number.
-        """
-        return CTaosInterface.libtaos.taos_errno(result)
-
-    @staticmethod
-    def errStr(result):
-        """Return the error styring
         """
-        return CTaosInterface.libtaos.taos_errstr(result).decode('utf-8')
+        return taos_connect(host, user, password, db, port)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     cinter = CTaosInterface()
     conn = cinter.connect()
-    result = cinter.query(conn, 'show databases')
+    result = cinter.query(conn, "show databases")
 
-    print('Query Affected rows: {}'.format(cinter.affectedRows(result)))
+    print("Query Affected rows: {}".format(cinter.affected_rows(result)))
 
-    fields = CTaosInterface.useResult(result)
+    fields = taos_fetch_fields_raw(result)
 
-    data, num_of_rows = CTaosInterface.fetchBlock(result, fields)
+    data, num_of_rows = taos_fetch_block(result, fields)
 
     print(data)
 
-    cinter.freeResult(result)
+    cinter.free_result(result)
     cinter.close(conn)

src/connector/python/taos/connection.py

-from .cursor import TDengineCursor
-from .subscription import TDengineSubscription
-from .cinterface import CTaosInterface
+# encoding:UTF-8
+from types import FunctionType
+from .cinterface import *
+from .cursor import TaosCursor
+from .subscription import TaosSubscription
+from .statement import TaosStmt
+from .stream import TaosStream
+from .result import *
 
 
-class TDengineConnection(object):
-    """ TDengine connection object
-    """
+class TaosConnection(object):
+    """TDengine connection object"""
 
     def __init__(self, *args, **kwargs):
         self._conn = None
@@ -21,63 +25,130 @@ class TDengineConnection(object):
 
     def config(self, **kwargs):
         # host
-        if 'host' in kwargs:
-            self._host = kwargs['host']
+        if "host" in kwargs:
+            self._host = kwargs["host"]
 
         # user
-        if 'user' in kwargs:
-            self._user = kwargs['user']
+        if "user" in kwargs:
+            self._user = kwargs["user"]
 
         # password
-        if 'password' in kwargs:
-            self._password = kwargs['password']
+        if "password" in kwargs:
+            self._password = kwargs["password"]
 
         # database
-        if 'database' in kwargs:
-            self._database = kwargs['database']
+        if "database" in kwargs:
+            self._database = kwargs["database"]
 
         # port
-        if 'port' in kwargs:
-            self._port = kwargs['port']
+        if "port" in kwargs:
+            self._port = kwargs["port"]
 
         # config
-        if 'config' in kwargs:
-            self._config = kwargs['config']
+        if "config" in kwargs:
+            self._config = kwargs["config"]
 
         self._chandle = CTaosInterface(self._config)
-        self._conn = self._chandle.connect(
-            self._host,
-            self._user,
-            self._password,
-            self._database,
-            self._port)
+        self._conn = self._chandle.connect(self._host, self._user, self._password, self._database, self._port)
 
     def close(self):
-        """Close current connection.
-        """
-        return CTaosInterface.close(self._conn)
-
-    def subscribe(self, restart, topic, sql, interval):
-        """Create a subscription.
-        """
+        """Close current connection."""
+        if self._conn:
+            taos_close(self._conn)
+            self._conn = None
+
+    @property
+    def client_info(self):
+        # type: () -> str
+        return taos_get_client_info()
+
+    @property
+    def server_info(self):
+        # type: () -> str
+        return taos_get_server_info(self._conn)
+
+    def select_db(self, database):
+        # type: (str) -> None
+        taos_select_db(self._conn, database)
+
+    def execute(self, sql):
+        # type: (str) -> None
+        """Simplely execute sql ignoring the results"""
+        res = taos_query(self._conn, sql)
+        taos_free_result(res)
+
+    def query(self, sql):
+        # type: (str) -> TaosResult
+        result = taos_query(self._conn, sql)
+        return TaosResult(result, True, self)
+
+    def query_a(self, sql, callback, param):
+        # type: (str, async_query_callback_type, c_void_p) -> None
+        """Asynchronously query a sql with callback function"""
+        taos_query_a(self._conn, sql, callback, param)
+
+    def subscribe(self, restart, topic, sql, interval, callback=None, param=None):
+        # type: (bool, str, str, int, subscribe_callback_type, c_void_p) -> TaosSubscription
+        """Create a subscription."""
         if self._conn is None:
             return None
-        sub = CTaosInterface.subscribe(
-            self._conn, restart, topic, sql, interval)
-        return TDengineSubscription(sub)
+        sub = taos_subscribe(self._conn, restart, topic, sql, interval, callback, param)
+        return TaosSubscription(sub, callback != None)
 
-    def insertLines(self, lines):
-        """
-        insert lines through line protocol
-        """
+    def statement(self, sql=None):
+        # type: (str | None) -> TaosStmt
         if self._conn is None:
             return None
-        return CTaosInterface.insertLines(self._conn, lines)
-        
-    def cursor(self):
-        """Return a new Cursor object using the connection.
+        stmt = taos_stmt_init(self._conn)
+        if sql != None:
+            taos_stmt_prepare(stmt, sql)
+
+        return TaosStmt(stmt)
+
+    def load_table_info(self, tables):
+        # type: (str) -> None
+        taos_load_table_info(self._conn, tables)
+
+    def stream(self, sql, callback, stime=0, param=None, callback2=None):
+        # type: (str, Callable[[Any, TaosResult, TaosRows], None], int, Any, c_void_p) -> TaosStream
+        # cb = cast(callback, stream_callback_type)
+        # ref = byref(cb)
+
+        stream = taos_open_stream(self._conn, sql, callback, stime, param, callback2)
+        return TaosStream(stream)
+
+    def insert_lines(self, lines):
+        # type: (list[str]) -> None
+        """Line protocol and schemaless support
+
+        ## Example
+
+        ```python
+        import taos
+        conn = taos.connect()
+        conn.exec("drop database if exists test")
+        conn.select_db("test")
+        lines = [
+            'ste,t2=5,t3=L"ste" c1=true,c2=4,c3="string" 1626056811855516532',
+        ]
+        conn.insert_lines(lines)
+        ```
+
+        ## Exception
+
+        ```python
+        try:
+            conn.insert_lines(lines)
+        except SchemalessError as err:
+            print(err)
+        ```
         """
-        return TDengineCursor(self)
+        return taos_insert_lines(self._conn, lines)
+
+    def cursor(self):
+        # type: () -> TaosCursor
+        """Return a new Cursor object using the connection."""
+        return TaosCursor(self)
 
     def commit(self):
         """Commit any pending transaction to the database.
@@ -87,17 +158,18 @@ class TDengineConnection(object):
         pass
 
     def rollback(self):
-        """Void functionality
-        """
+        """Void functionality"""
         pass
 
     def clear_result_set(self):
-        """Clear unused result set on this connection.
-        """
+        """Clear unused result set on this connection."""
         pass
 
+    def __del__(self):
+        self.close()
+
 
 if __name__ == "__main__":
-    conn = TDengineConnection(host='192.168.1.107')
+    conn = TaosConnection()
     conn.close()
     print("Hello world")

src/connector/python/taos/constants.py

+# encoding:UTF-8
+
 """Constants in TDengine python
 """
 
-from .dbapi import *
-
-
 class FieldType(object):
-    """TDengine Field Types
-    """
+    """TDengine Field Types"""
+
     # type_code
     C_NULL = 0
     C_BOOL = 1
@@ -34,9 +33,9 @@ class FieldType(object):
     C_INT_UNSIGNED_NULL = 4294967295
     C_BIGINT_NULL = -9223372036854775808
     C_BIGINT_UNSIGNED_NULL = 18446744073709551615
-    C_FLOAT_NULL = float('nan')
-    C_DOUBLE_NULL = float('nan')
-    C_BINARY_NULL = bytearray([int('0xff', 16)])
+    C_FLOAT_NULL = float("nan")
+    C_DOUBLE_NULL = float("nan")
+    C_BINARY_NULL = bytearray([int("0xff", 16)])
     # Timestamp precision definition
     C_TIMESTAMP_MILLI = 0
     C_TIMESTAMP_MICRO = 1

src/connector/python/taos/cursor.py

-from .cinterface import CTaosInterface
+# encoding:UTF-8
+from .cinterface import *
 from .error import *
 from .constants import FieldType
+from .result import *
 
-# querySeqNum = 0
 
-
-class TDengineCursor(object):
+class TaosCursor(object):
     """Database cursor which is used to manage the context of a fetch operation.
 
     Attributes:
         .description: Read-only attribute consists of 7-item sequences:
 
-            > name (mondatory)
-            > type_code (mondatory)
+            > name (mandatory)
+            > type_code (mandatory)
             > display_size
             > internal_size
             > precision
@@ -55,8 +55,7 @@ class TDengineCursor(object):
             raise OperationalError("Invalid use of fetch iterator")
 
         if self._block_rows <= self._block_iter:
-            block, self._block_rows = CTaosInterface.fetchRow(
-                self._result, self._fields)
+            block, self._block_rows = taos_fetch_row(self._result, self._fields)
             if self._block_rows == 0:
                 raise StopIteration
             self._block = list(map(tuple, zip(*block)))
@@ -69,20 +68,17 @@ class TDengineCursor(object):
 
     @property
     def description(self):
-        """Return the description of the object.
-        """
+        """Return the description of the object."""
         return self._description
 
     @property
     def rowcount(self):
-        """Return the rowcount of the object
-        """
+        """Return the rowcount of the object"""
         return self._rowcount
 
     @property
     def affected_rows(self):
-        """Return the rowcount of insertion
-        """
+        """Return the rowcount of insertion"""
         return self._affected_rows
 
     def callproc(self, procname, *args):
@@ -96,8 +92,7 @@ class TDengineCursor(object):
         self._logfile = logfile
 
     def close(self):
-        """Close the cursor.
-        """
+        """Close the cursor."""
         if self._connection is None:
             return False
 
@@ -107,8 +102,7 @@ class TDengineCursor(object):
         return True
 
     def execute(self, operation, params=None):
-        """Prepare and execute a database operation (query or command).
-        """
+        """Prepare and execute a database operation (query or command)."""
         if not operation:
             return None
 
@@ -124,104 +118,91 @@ class TDengineCursor(object):
 
         # global querySeqNum
         # querySeqNum += 1
-        # localSeqNum = querySeqNum # avoid raice condition
+        # localSeqNum = querySeqNum # avoid race condition
         # print("   >> Exec Query ({}): {}".format(localSeqNum, str(stmt)))
-        self._result = CTaosInterface.query(self._connection._conn, stmt)
+        self._result = taos_query(self._connection._conn, stmt)
         # print("   << Query ({}) Exec Done".format(localSeqNum))
-        if (self._logfile):
+        if self._logfile:
             with open(self._logfile, "a") as logfile:
                 logfile.write("%s;\n" % operation)
 
-        errno = CTaosInterface.libtaos.taos_errno(self._result)
-        if errno == 0:
-            if CTaosInterface.fieldsCount(self._result) == 0:
-                self._affected_rows += CTaosInterface.affectedRows(
-                    self._result)
-                return CTaosInterface.affectedRows(self._result)
-            else:
-                self._fields = CTaosInterface.useResult(
-                    self._result)
-                return self._handle_result()
+        if taos_field_count(self._result) == 0:
+            affected_rows = taos_affected_rows(self._result)
+            self._affected_rows += affected_rows
+            return affected_rows
         else:
-            raise ProgrammingError(
-                CTaosInterface.errStr(
-                    self._result), errno)
+            self._fields = taos_fetch_fields(self._result)
+            return self._handle_result()
 
     def executemany(self, operation, seq_of_parameters):
-        """Prepare a database operation (query or command) and then execute it against all parameter sequences or mappings found in the sequence seq_of_parameters.
-        """
+        """Prepare a database operation (query or command) and then execute it against all parameter sequences or mappings found in the sequence seq_of_parameters."""
         pass
 
     def fetchone(self):
-        """Fetch the next row of a query result set, returning a single sequence, or None when no more data is available.
-        """
+        """Fetch the next row of a query result set, returning a single sequence, or None when no more data is available."""
         pass
 
     def fetchmany(self):
         pass
 
     def istype(self, col, dataType):
-        if (dataType.upper() == "BOOL"):
-            if (self._description[col][1] == FieldType.C_BOOL):
+        if dataType.upper() == "BOOL":
+            if self._description[col][1] == FieldType.C_BOOL:
                 return True
-        if (dataType.upper() == "TINYINT"):
-            if (self._description[col][1] == FieldType.C_TINYINT):
+        if dataType.upper() == "TINYINT":
+            if self._description[col][1] == FieldType.C_TINYINT:
                 return True
-        if (dataType.upper() == "TINYINT UNSIGNED"):
-            if (self._description[col][1] == FieldType.C_TINYINT_UNSIGNED):
+        if dataType.upper() == "TINYINT UNSIGNED":
+            if self._description[col][1] == FieldType.C_TINYINT_UNSIGNED:
                 return True
-        if (dataType.upper() == "SMALLINT"):
-            if (self._description[col][1] == FieldType.C_SMALLINT):
+        if dataType.upper() == "SMALLINT":
+            if self._description[col][1] == FieldType.C_SMALLINT:
                 return True
-        if (dataType.upper() == "SMALLINT UNSIGNED"):
-            if (self._description[col][1] == FieldType.C_SMALLINT_UNSIGNED):
+        if dataType.upper() == "SMALLINT UNSIGNED":
+            if self._description[col][1] == FieldType.C_SMALLINT_UNSIGNED:
                 return True
-        if (dataType.upper() == "INT"):
-            if (self._description[col][1] == FieldType.C_INT):
+        if dataType.upper() == "INT":
+            if self._description[col][1] == FieldType.C_INT:
                 return True
-        if (dataType.upper() == "INT UNSIGNED"):
-            if (self._description[col][1] == FieldType.C_INT_UNSIGNED):
+        if dataType.upper() == "INT UNSIGNED":
+            if self._description[col][1] == FieldType.C_INT_UNSIGNED:
                 return True
-        if (dataType.upper() == "BIGINT"):
-            if (self._description[col][1] == FieldType.C_BIGINT):
+        if dataType.upper() == "BIGINT":
+            if self._description[col][1] == FieldType.C_BIGINT:
                 return True
-        if (dataType.upper() == "BIGINT UNSIGNED"):
-            if (self._description[col][1] == FieldType.C_BIGINT_UNSIGNED):
+        if dataType.upper() == "BIGINT UNSIGNED":
+            if self._description[col][1] == FieldType.C_BIGINT_UNSIGNED:
                 return True
-        if (dataType.upper() == "FLOAT"):
-            if (self._description[col][1] == FieldType.C_FLOAT):
+        if dataType.upper() == "FLOAT":
+            if self._description[col][1] == FieldType.C_FLOAT:
                 return True
-        if (dataType.upper() == "DOUBLE"):
-            if (self._description[col][1] == FieldType.C_DOUBLE):
+        if dataType.upper() == "DOUBLE":
+            if self._description[col][1] == FieldType.C_DOUBLE:
                 return True
-        if (dataType.upper() == "BINARY"):
-            if (self._description[col][1] == FieldType.C_BINARY):
+        if dataType.upper() == "BINARY":
+            if self._description[col][1] == FieldType.C_BINARY:
                 return True
-        if (dataType.upper() == "TIMESTAMP"):
-            if (self._description[col][1] == FieldType.C_TIMESTAMP):
+        if dataType.upper() == "TIMESTAMP":
+            if self._description[col][1] == FieldType.C_TIMESTAMP:
                 return True
-        if (dataType.upper() == "NCHAR"):
-            if (self._description[col][1] == FieldType.C_NCHAR):
+        if dataType.upper() == "NCHAR":
+            if self._description[col][1] == FieldType.C_NCHAR:
                 return True
 
         return False
 
     def fetchall_row(self):
-        """Fetch all (remaining) rows of a query result, returning them as a sequence of sequences (e.g. a list of tuples). Note that the cursor's arraysize attribute can affect the performance of this operation.
-        """
+        """Fetch all (remaining) rows of a query result, returning them as a sequence of sequences (e.g. a list of tuples). Note that the cursor's arraysize attribute can affect the performance of this operation."""
         if self._result is None or self._fields is None:
             raise OperationalError("Invalid use of fetchall")
 
         buffer = [[] for i in range(len(self._fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchRow(
-                self._result, self._fields)
-            errno = CTaosInterface.libtaos.taos_errno(self._result)
+            block, num_of_fields = taos_fetch_row(self._result, self._fields)
+            errno = taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(
-                    CTaosInterface.errStr(
-                        self._result), errno)
+                raise ProgrammingError(taos_errstr(self._result), errno)
             if num_of_fields == 0:
                 break
             self._rowcount += num_of_fields
@@ -230,19 +211,16 @@ class TDengineCursor(object):
         return list(map(tuple, zip(*buffer)))
 
     def fetchall(self):
-        if self._result is None or self._fields is None:
+        if self._result is None:
             raise OperationalError("Invalid use of fetchall")
-
-        buffer = [[] for i in range(len(self._fields))]
+        fields = self._fields if self._fields is not None else taos_fetch_fields(self._result)
+        buffer = [[] for i in range(len(fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchBlock(
-                self._result, self._fields)
-            errno = CTaosInterface.libtaos.taos_errno(self._result)
+            block, num_of_fields = taos_fetch_block(self._result, self._fields)
+            errno = taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(
-                    CTaosInterface.errStr(
-                        self._result), errno)
+                raise ProgrammingError(taos_errstr(self._result), errno)
             if num_of_fields == 0:
                 break
             self._rowcount += num_of_fields
@@ -250,9 +228,12 @@ class TDengineCursor(object):
                 buffer[i].extend(block[i])
         return list(map(tuple, zip(*buffer)))
 
+    def stop_query(self):
+        if self._result != None:
+            taos_stop_query(self._result)
+            
     def nextset(self):
-        """
-        """
+        """ """
         pass
 
     def setinputsize(self, sizes):
@@ -262,12 +243,11 @@ class TDengineCursor(object):
         pass
 
     def _reset_result(self):
-        """Reset the result to unused version.
-        """
+        """Reset the result to unused version."""
         self._description = []
         self._rowcount = -1
         if self._result is not None:
-            CTaosInterface.freeResult(self._result)
+            taos_free_result(self._result)
         self._result = None
         self._fields = None
         self._block = None
@@ -276,11 +256,12 @@ class TDengineCursor(object):
         self._affected_rows = 0
 
     def _handle_result(self):
-        """Handle the return result from query.
-        """
+        """Handle the return result from query."""
         self._description = []
         for ele in self._fields:
-            self._description.append(
-                (ele['name'], ele['type'], None, None, None, None, False))
+            self._description.append((ele["name"], ele["type"], None, None, None, None, False))
 
         return self._result
+
+    def __del__(self):
+        self.close()

src/connector/python/taos/dbapi.py

-"""Type Objects and Constructors.
-"""
-
-import time
-import datetime
-
-
-class DBAPITypeObject(object):
-    def __init__(self, *values):
-        self.values = values
-
-    def __com__(self, other):
-        if other in self.values:
-            return 0
-        if other < self.values:
-            return 1
-        else:
-            return -1
-
-
-Date = datetime.date
-Time = datetime.time
-Timestamp = datetime.datetime
-
-
-def DataFromTicks(ticks):
-    return Date(*time.localtime(ticks)[:3])
-
-
-def TimeFromTicks(ticks):
-    return Time(*time.localtime(ticks)[3:6])
-
-
-def TimestampFromTicks(ticks):
-    return Timestamp(*time.localtime(ticks)[:6])
-
-
-Binary = bytes
-
-# STRING = DBAPITypeObject(*constants.FieldType.get_string_types())
-# BINARY = DBAPITypeObject(*constants.FieldType.get_binary_types())
-# NUMBER = BAPITypeObject(*constants.FieldType.get_number_types())
-# DATETIME = DBAPITypeObject(*constants.FieldType.get_timestamp_types())
-# ROWID = DBAPITypeObject()

src/connector/python/taos/error.py

+# encoding:UTF-8
 """Python exceptions
 """
 
 
 class Error(Exception):
-    def __init__(self, msg=None, errno=None):
+    def __init__(self, msg=None, errno=0xffff):
         self.msg = msg
-        self._full_msg = self.msg
         self.errno = errno
+        self._full_msg = "[0x%04x]: %s" % (self.errno & 0xffff, self.msg)
 
     def __str__(self):
         return self._full_msg
 
 
 class Warning(Exception):
-    """Exception raised for important warnings like data truncations while inserting.
-    """
+    """Exception raised for important warnings like data truncations while inserting."""
+
     pass
 
 
 class InterfaceError(Error):
-    """Exception raised for errors that are related to the database interface rather than the database itself.
-    """
+    """Exception raised for errors that are related to the database interface rather than the database itself."""
+
     pass
 
 
 class DatabaseError(Error):
-    """Exception raised for errors that are related to the database.
-    """
+    """Exception raised for errors that are related to the database."""
+
     pass
 
+class ConnectionError(Error):
+    """Exceptin raised for connection failed"""
+    pass
 
 class DataError(DatabaseError):
-    """Exception raised for errors that are due to problems with the processed data like division by zero, numeric value out of range.
-    """
+    """Exception raised for errors that are due to problems with the processed data like division by zero, numeric value out of range."""
+
     pass
 
 
 class OperationalError(DatabaseError):
-    """Exception raised for errors that are related to the database's operation and not necessarily under the control of the programmer
-    """
+    """Exception raised for errors that are related to the database's operation and not necessarily under the control of the programmer"""
+
     pass
 
 
 class IntegrityError(DatabaseError):
-    """Exception raised when the relational integrity of the database is affected.
-    """
+    """Exception raised when the relational integrity of the database is affected."""
+
     pass
 
 
 class InternalError(DatabaseError):
-    """Exception raised when the database encounters an internal error.
-    """
+    """Exception raised when the database encounters an internal error."""
+
     pass
 
 
 class ProgrammingError(DatabaseError):
-    """Exception raised for programming errors.
-    """
+    """Exception raised for programming errors."""
+
     pass
 
 
 class NotSupportedError(DatabaseError):
-    """Exception raised in case a method or database API was used which is not supported by the database,.
-    """
+    """Exception raised in case a method or database API was used which is not supported by the database,."""
+
     pass
+
+
+class StatementError(DatabaseError):
+    """Exception raised in STMT API."""
+
+    pass
+
+class ResultError(DatabaseError):
+    """Result related APIs."""
+
+    pass
+
+class LinesError(DatabaseError):
+    """taos_insert_lines errors."""
+
+    pass
\ No newline at end of file

src/connector/python/taos/field.py

+# encoding:UTF-8
+import ctypes
+import math
+import datetime
+from ctypes import *
+
+from .constants import FieldType
+from .error import *
+
+_datetime_epoch = datetime.datetime.fromtimestamp(0)
+
+def _convert_millisecond_to_datetime(milli):
+    return _datetime_epoch + datetime.timedelta(seconds=milli / 1000.0)
+
+
+def _convert_microsecond_to_datetime(micro):
+    return _datetime_epoch + datetime.timedelta(seconds=micro / 1000000.0)
+
+
+def _convert_nanosecond_to_datetime(nanosec):
+    return nanosec
+
+
+def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C bool row to python row"""
+    _timestamp_converter = _convert_millisecond_to_datetime
+    if precision == FieldType.C_TIMESTAMP_MILLI:
+        _timestamp_converter = _convert_millisecond_to_datetime
+    elif precision == FieldType.C_TIMESTAMP_MICRO:
+        _timestamp_converter = _convert_microsecond_to_datetime
+    elif precision == FieldType.C_TIMESTAMP_NANO:
+        _timestamp_converter = _convert_nanosecond_to_datetime
+    else:
+        raise DatabaseError("Unknown precision returned from database")
+
+    return [
+        None if ele == FieldType.C_BIGINT_NULL else _timestamp_converter(ele)
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_int64))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_bool_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C bool row to python row"""
+    return [
+        None if ele == FieldType.C_BOOL_NULL else bool(ele)
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_byte))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_tinyint_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C tinyint row to python row"""
+    return [
+        None if ele == FieldType.C_TINYINT_NULL else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_byte))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_tinyint_unsigned_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C tinyint row to python row"""
+    return [
+        None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_ubyte))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_smallint_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C smallint row to python row"""
+    return [
+        None if ele == FieldType.C_SMALLINT_NULL else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_short))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_smallint_unsigned_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C smallint row to python row"""
+    return [
+        None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_ushort))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_int_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C int row to python row"""
+    return [
+        None if ele == FieldType.C_INT_NULL else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_int))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_int_unsigned_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C int row to python row"""
+    return [
+        None if ele == FieldType.C_INT_UNSIGNED_NULL else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_uint))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_bigint_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C bigint row to python row"""
+    return [
+        None if ele == FieldType.C_BIGINT_NULL else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_int64))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_bigint_unsigned_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C bigint row to python row"""
+    return [
+        None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_uint64))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_float_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C float row to python row"""
+    return [
+        None if math.isnan(ele) else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_float))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_double_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C double row to python row"""
+    return [
+        None if math.isnan(ele) else ele
+        for ele in ctypes.cast(data, ctypes.POINTER(ctypes.c_double))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_binary_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C binary row to python row"""
+    assert nbytes is not None
+    return [
+        None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode("utf-8")
+        for ele in (ctypes.cast(data, ctypes.POINTER(ctypes.c_char * nbytes)))[: abs(num_of_rows)]
+    ]
+
+
+def _crow_nchar_to_python(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C nchar row to python row"""
+    assert nbytes is not None
+    res = []
+    for i in range(abs(num_of_rows)):
+        try:
+            if num_of_rows >= 0:
+                tmpstr = ctypes.c_char_p(data)
+                res.append(tmpstr.value.decode())
+            else:
+                res.append(
+                    (
+                        ctypes.cast(
+                            data + nbytes * i,
+                            ctypes.POINTER(ctypes.c_wchar * (nbytes // 4)),
+                        )
+                    )[0].value
+                )
+        except ValueError:
+            res.append(None)
+
+    return res
+
+
+def _crow_binary_to_python_block(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C binary row to python row"""
+    assert nbytes is not None
+    res = []
+    for i in range(abs(num_of_rows)):
+        try:
+            rbyte = ctypes.cast(data + nbytes * i, ctypes.POINTER(ctypes.c_short))[:1].pop()
+            tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+            res.append(tmpstr.value.decode()[0:rbyte])
+        except ValueError:
+            res.append(None)
+    return res
+
+
+def _crow_nchar_to_python_block(data, num_of_rows, nbytes=None, precision=FieldType.C_TIMESTAMP_UNKNOWN):
+    """Function to convert C nchar row to python row"""
+    assert nbytes is not None
+    res = []
+    for i in range(abs(num_of_rows)):
+        try:
+            tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+            res.append(tmpstr.value.decode())
+        except ValueError:
+            res.append(None)
+    return res
+
+
+CONVERT_FUNC = {
+    FieldType.C_BOOL: _crow_bool_to_python,
+    FieldType.C_TINYINT: _crow_tinyint_to_python,
+    FieldType.C_SMALLINT: _crow_smallint_to_python,
+    FieldType.C_INT: _crow_int_to_python,
+    FieldType.C_BIGINT: _crow_bigint_to_python,
+    FieldType.C_FLOAT: _crow_float_to_python,
+    FieldType.C_DOUBLE: _crow_double_to_python,
+    FieldType.C_BINARY: _crow_binary_to_python,
+    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
+    FieldType.C_NCHAR: _crow_nchar_to_python,
+    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
+    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
+    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
+    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python,
+}
+
+CONVERT_FUNC_BLOCK = {
+    FieldType.C_BOOL: _crow_bool_to_python,
+    FieldType.C_TINYINT: _crow_tinyint_to_python,
+    FieldType.C_SMALLINT: _crow_smallint_to_python,
+    FieldType.C_INT: _crow_int_to_python,
+    FieldType.C_BIGINT: _crow_bigint_to_python,
+    FieldType.C_FLOAT: _crow_float_to_python,
+    FieldType.C_DOUBLE: _crow_double_to_python,
+    FieldType.C_BINARY: _crow_binary_to_python_block,
+    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
+    FieldType.C_NCHAR: _crow_nchar_to_python_block,
+    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
+    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
+    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
+    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python,
+}
+
+# Corresponding TAOS_FIELD structure in C
+
+
+class TaosField(ctypes.Structure):
+    _fields_ = [
+        ("_name", ctypes.c_char * 65),
+        ("_type", ctypes.c_uint8),
+        ("_bytes", ctypes.c_uint16),
+    ]
+
+    @property
+    def name(self):
+        return self._name.decode("utf-8")
+
+    @property
+    def length(self):
+        """alias to self.bytes"""
+        return self._bytes
+
+    @property
+    def bytes(self):
+        return self._bytes
+
+    @property
+    def type(self):
+        return self._type
+
+    def __dict__(self):
+        return {"name": self.name, "type": self.type, "bytes": self.length}
+
+    def __str__(self):
+        return "{name: %s, type: %d, bytes: %d}" % (self.name, self.type, self.length)
+
+    def __getitem__(self, item):
+        return getattr(self, item)
+
+
+class TaosFields(object):
+    def __init__(self, fields, count):
+        if isinstance(fields, c_void_p):
+            self._fields = cast(fields, POINTER(TaosField))
+        if isinstance(fields, POINTER(TaosField)):
+            self._fields = fields
+        self._count = count
+        self._iter = 0
+
+    def as_ptr(self):
+        return self._fields
+
+    @property
+    def count(self):
+        return self._count
+
+    @property
+    def fields(self):
+        return self._fields
+
+    def __next__(self):
+        return self._next_field()
+    
+    def next(self):
+        return self._next_field()
+
+    def _next_field(self):
+        if self._iter < self.count:
+            field = self._fields[self._iter]
+            self._iter += 1
+            return field
+        else:
+            raise StopIteration
+
+    def __getitem__(self, item):
+        return self._fields[item]
+
+    def __iter__(self):
+        return self
+
+    def __len__(self):
+        return self.count

src/connector/python/taos/precision.py

+class PrecisionEnum(object):
+    """Precision enums"""
+
+    Milliseconds = 0
+    Microseconds = 1
+    Nanoseconds = 2
+
+
+class PrecisionError(Exception):
+    """Python datetime does not support nanoseconds error"""
+
+    pass

src/connector/python/taos/result.py

+from .cinterface import *
+
+# from .connection import TaosConnection
+from .error import *
+
+
+class TaosResult(object):
+    """TDengine result interface"""
+
+    def __init__(self, result, close_after=False, conn=None):
+        # type: (c_void_p, bool, TaosConnection) -> TaosResult
+        # to make the __del__ order right
+        self._conn = conn
+        self._close_after = close_after
+        self._result = result
+        self._fields = None
+        self._field_count = None
+        self._precision = None
+
+        self._block = None
+        self._block_length = None
+        self._row_count = 0
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return self._next_row()
+
+    def next(self):
+        # fetch next row
+        return self._next_row()
+
+    def _next_row(self):
+        if self._result is None or self.fields is None:
+            raise OperationalError("Invalid use of fetch iterator")
+
+        if self._block == None or self._block_iter >= self._block_length:
+            self._block, self._block_length = self.fetch_block()
+            self._block_iter = 0
+            # self._row_count += self._block_length
+
+        raw = self._block[self._block_iter]
+        self._block_iter += 1
+        return raw
+
+    @property
+    def fields(self):
+        """fields definitions of the current result"""
+        if self._result is None:
+            raise ResultError("no result object setted")
+        if self._fields == None:
+            self._fields = taos_fetch_fields(self._result)
+
+        return self._fields
+
+    @property
+    def field_count(self):
+        """Field count of the current result, eq to taos_field_count(result)"""
+        return self.fields.count
+
+    @property
+    def row_count(self):
+        """Return the rowcount of the object"""
+        return self._row_count
+
+    @property
+    def precision(self):
+        if self._precision == None:
+            self._precision = taos_result_precision(self._result)
+        return self._precision
+
+    @property
+    def affected_rows(self):
+        return taos_affected_rows(self._result)
+
+    # @property
+    def field_lengths(self):
+        return taos_fetch_lengths(self._result, self.field_count)
+
+    def rows_iter(self, num_of_rows=None):
+        return TaosRows(self, num_of_rows)
+
+    def blocks_iter(self):
+        return TaosBlocks(self)
+
+    def fetch_block(self):
+        if self._result is None:
+            raise OperationalError("Invalid use of fetch iterator")
+
+        block, length = taos_fetch_block_raw(self._result)
+        if length == 0:
+            raise StopIteration
+        precision = self.precision
+        field_count = self.field_count
+        fields = self.fields
+        blocks = [None] * field_count
+        lengths = self.field_lengths()
+        for i in range(field_count):
+            data = ctypes.cast(block, ctypes.POINTER(ctypes.c_void_p))[i]
+            if fields[i].type not in CONVERT_FUNC_BLOCK:
+                raise DatabaseError("Invalid data type returned from database")
+            blocks[i] = CONVERT_FUNC_BLOCK[fields[i].type](data, length, lengths[i], precision)
+
+        return list(map(tuple, zip(*blocks))), length
+
+    def fetch_all(self):
+        if self._result is None:
+            raise OperationalError("Invalid use of fetchall")
+
+        if self._fields == None:
+            self._fields = taos_fetch_fields(self._result)
+        buffer = [[] for i in range(len(self._fields))]
+        self._row_count = 0
+        while True:
+            block, num_of_fields = taos_fetch_block(self._result, self._fields)
+            errno = taos_errno(self._result)
+            if errno != 0:
+                raise ProgrammingError(taos_errstr(self._result), errno)
+            if num_of_fields == 0:
+                break
+            self._row_count += num_of_fields
+            for i in range(len(self._fields)):
+                buffer[i].extend(block[i])
+        return list(map(tuple, zip(*buffer)))
+
+    def fetch_rows_a(self, callback, param):
+        taos_fetch_rows_a(self._result, callback, param)
+
+    def stop_query(self):
+        return taos_stop_query(self._result)
+
+    def errno(self):
+        """**DO NOT** use this directly unless you know what you are doing"""
+        return taos_errno(self._result)
+
+    def errstr(self):
+        return taos_errstr(self._result)
+
+    def check_error(self, errno=None, close=True):
+        if errno == None:
+            errno = self.errno()
+        if errno != 0:
+            msg = self.errstr()
+            self.close()
+            raise OperationalError(msg, errno)
+
+    def close(self):
+        """free result object."""
+        if self._result != None and self._close_after:
+            taos_free_result(self._result)
+        self._result = None
+        self._fields = None
+        self._field_count = None
+        self._field_lengths = None
+
+    def __del__(self):
+        self.close()
+
+
+class TaosRows:
+    """TDengine result rows iterator"""
+
+    def __init__(self, result, num_of_rows=None):
+        self._result = result
+        self._num_of_rows = num_of_rows
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return self._next_row()
+
+    def next(self):
+        return self._next_row()
+
+    def _next_row(self):
+        if self._result is None:
+            raise OperationalError("Invalid use of fetch iterator")
+        if self._num_of_rows != None and self._num_of_rows <= self._result._row_count:
+            raise StopIteration
+
+        row = taos_fetch_row_raw(self._result._result)
+        if not row:
+            raise StopIteration
+        self._result._row_count += 1
+        return TaosRow(self._result, row)
+
+    @property
+    def row_count(self):
+        """Return the rowcount of the object"""
+        return self._result._row_count
+
+
+class TaosRow:
+    def __init__(self, result, row):
+        self._result = result
+        self._row = row
+
+    def __str__(self):
+        return taos_print_row(self._row, self._result.fields, self._result.field_count)
+
+    def __call__(self):
+        return self.as_tuple()
+
+    def _astuple(self):
+        return self.as_tuple()
+
+    def __iter__(self):
+        return self.as_tuple()
+
+    def as_ptr(self):
+        return self._row
+
+    def as_tuple(self):
+        precision = self._result.precision
+        field_count = self._result.field_count
+        blocks = [None] * field_count
+        fields = self._result.fields
+        field_lens = self._result.field_lengths()
+        for i in range(field_count):
+            data = ctypes.cast(self._row, ctypes.POINTER(ctypes.c_void_p))[i]
+            if fields[i].type not in CONVERT_FUNC:
+                raise DatabaseError("Invalid data type returned from database")
+            if data is None:
+                blocks[i] = None
+            else:
+                blocks[i] = CONVERT_FUNC[fields[i].type](data, 1, field_lens[i], precision)[0]
+        return tuple(blocks)
+
+
+class TaosBlocks:
+    """TDengine result blocks iterator"""
+
+    def __init__(self, result):
+        self._result = result
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return self._result.fetch_block()
+
+    def next(self):
+        return self._result.fetch_block()

src/connector/python/taos/statement.py

+from taos.cinterface import *
+from taos.error import *
+from taos.result import *
+
+
+class TaosStmt(object):
+    """TDengine STMT interface"""
+
+    def __init__(self, stmt, conn = None):
+        self._conn = conn
+        self._stmt = stmt
+
+    def set_tbname(self, name):
+        """Set table name if needed.
+
+        Note that the set_tbname* method should only used in insert statement
+        """
+        if self._stmt is None:
+            raise StatementError("Invalid use of set_tbname")
+        taos_stmt_set_tbname(self._stmt, name)
+
+    def prepare(self, sql):
+        # type: (str) -> None
+        taos_stmt_prepare(self._stmt, sql)
+
+    def set_tbname_tags(self, name, tags):
+        # type: (str, Array[TaosBind]) -> None
+        """Set table name with tags, tags is array of BindParams"""
+        if self._stmt is None:
+            raise StatementError("Invalid use of set_tbname")
+        taos_stmt_set_tbname_tags(self._stmt, name, tags)
+
+    def bind_param(self, params, add_batch=True):
+        # type: (Array[TaosBind], bool) -> None
+        if self._stmt is None:
+            raise StatementError("Invalid use of stmt")
+        taos_stmt_bind_param(self._stmt, params)
+        if add_batch:
+            taos_stmt_add_batch(self._stmt)
+
+    def bind_param_batch(self, binds, add_batch=True):
+        # type: (Array[TaosMultiBind], bool) -> None
+        if self._stmt is None:
+            raise StatementError("Invalid use of stmt")
+        taos_stmt_bind_param_batch(self._stmt, binds)
+        if add_batch:
+            taos_stmt_add_batch(self._stmt)
+
+    def add_batch(self):
+        if self._stmt is None:
+            raise StatementError("Invalid use of stmt")
+        taos_stmt_add_batch(self._stmt)
+
+    def execute(self):
+        if self._stmt is None:
+            raise StatementError("Invalid use of execute")
+        taos_stmt_execute(self._stmt)
+
+    def use_result(self):
+        result = taos_stmt_use_result(self._stmt)
+        return TaosResult(result)
+
+    def close(self):
+        """Close stmt."""
+        if self._stmt is None:
+            return
+        taos_stmt_close(self._stmt)
+        self._stmt = None
+
+    def __del__(self):
+        self.close()
+
+
+if __name__ == "__main__":
+    from taos.connection import TaosConnection
+
+    conn = TaosConnection()
+
+    stmt = conn.statement("select * from log.log limit 10")
+    stmt.execute()
+    result = stmt.use_result()
+    for row in result:
+        print(row)
+    stmt.close()
+    conn.close()

src/connector/python/taos/stream.py

+from taos.cinterface import *
+from taos.error import *
+from taos.result import *
+
+
+class TaosStream(object):
+    """TDengine Stream interface"""
+
+    def __init__(self, stream):
+        self._raw = stream
+
+    def as_ptr(self):
+        return self._raw
+
+    def close(self):
+        """Close stmt."""
+        if self._raw is not None:
+            taos_close_stream(self._raw)
+            self._raw = None
+
+    def __del__(self):
+        self.close()

src/connector/python/taos/subscription.py

-from .cinterface import CTaosInterface
+from taos.result import TaosResult
+from .cinterface import *
 from .error import *
 
 
-class TDengineSubscription(object):
-    """TDengine subscription object
-    """
+class TaosSubscription(object):
+    """TDengine subscription object"""
 
-    def __init__(self, sub):
+    def __init__(self, sub, with_callback = False):
         self._sub = sub
+        self._with_callback = with_callback
 
     def consume(self):
-        """Consume rows of a subscription
-        """
+        """Consume rows of a subscription"""
         if self._sub is None:
             raise OperationalError("Invalid use of consume")
-
-        result, fields = CTaosInterface.consume(self._sub)
-        buffer = [[] for i in range(len(fields))]
-        while True:
-            block, num_of_fields = CTaosInterface.fetchBlock(result, fields)
-            if num_of_fields == 0:
-                break
-            for i in range(len(fields)):
-                buffer[i].extend(block[i])
-
-        self.fields = fields
-        return list(map(tuple, zip(*buffer)))
+        if self._with_callback:
+            raise OperationalError("DONOT use consume method in an subscription with callback")
+        result = taos_consume(self._sub)
+        return TaosResult(result)
 
     def close(self, keepProgress=True):
-        """Close the Subscription.
-        """
+        """Close the Subscription."""
         if self._sub is None:
             return False
 
-        CTaosInterface.unsubscribe(self._sub, keepProgress)
+        taos_unsubscribe(self._sub, keepProgress)
+        self._sub = None
         return True
+    
+    def __del__(self):
+        self.close()
+
 
+if __name__ == "__main__":
+    from .connection import TaosConnection
 
-if __name__ == '__main__':
-    from .connection import TDengineConnection
-    conn = TDengineConnection(
-        host="127.0.0.1",
-        user="root",
-        password="taosdata",
-        database="test")
+    conn = TaosConnection(host="127.0.0.1", user="root", password="taosdata", database="test")
 
     # Generate a cursor object to run SQL commands
     sub = conn.subscribe(True, "test", "select * from meters;", 1000)

src/connector/python/taos/timestamp.py

+
+class TimestampType(object):
+    """Choose which type that parsing TDengine timestamp data to
+
+    - DATETIME: use python datetime.datetime, note that it does not support nanosecond precision,
+        and python taos will use raw c_int64 as a fallback for nanosecond results.
+    - NUMPY: use numpy.datetime64 type.
+    - RAW: use raw c_int64.
+    - TAOS: use taos' TaosTimestamp.
+    """
+    DATETIME = 0,
+    NUMPY = 1,
+    RAW = 2,
+    TAOS = 3,
+
+class TaosTimestamp:
+    pass

src/connector/python/tests/test_ctaos.py

+from taos.cinterface import *
+from taos.precision import *
+from taos.bind import *
+
+import time
+import datetime
+import pytest
+
+@pytest.fixture
+def conn():
+    return CTaosInterface().connect()
+
+
+def test_simple(conn, caplog):
+    dbname = "pytest_ctaos_simple"
+    try:
+        res = taos_query(conn, "create database if not exists %s" % dbname)
+        taos_free_result(res)
+
+        taos_select_db(conn, dbname)
+
+        res = taos_query(
+            conn,
+            "create table if not exists log(ts timestamp, level tinyint, content binary(100), ipaddr binary(134))",
+        )
+        taos_free_result(res)
+
+        res = taos_query(conn, "insert into log values(now, 1, 'hello', 'test')")
+        taos_free_result(res)
+
+        res = taos_query(conn, "select level,content,ipaddr from log limit 1")
+
+        fields = taos_fetch_fields_raw(res)
+        field_count = taos_field_count(res)
+
+        fields = taos_fetch_fields(res)
+        for field in fields:
+            print(field)
+
+        # field_lengths = taos_fetch_lengths(res, field_count)
+        # if not field_lengths:
+        #     raise "fetch lengths error"
+
+        row = taos_fetch_row_raw(res)
+        rowstr = taos_print_row(row, fields, field_count)
+        assert rowstr == "1 hello test"
+
+        row, num = taos_fetch_row(res, fields)
+        print(row)
+        taos_free_result(res)
+        taos_query(conn, "drop database if exists " + dbname)
+        taos_close(conn)
+    except Exception as err:
+        taos_query(conn, "drop database if exists " + dbname)
+        raise err
+
+
+def test_stmt(conn, caplog):
+    dbname = "pytest_ctaos_stmt"
+    try:
+        res = taos_query(conn, "drop database if exists %s" % dbname)
+        taos_free_result(res)
+        res = taos_query(conn, "create database if not exists %s" % dbname)
+        taos_free_result(res)
+
+        taos_select_db(conn, dbname)
+
+        res = taos_query(
+            conn,
+            "create table if not exists log(ts timestamp, nil tinyint, ti tinyint, si smallint, ii int,\
+             bi bigint, tu tinyint unsigned, su smallint unsigned, iu int unsigned, bu bigint unsigned, \
+             ff float, dd double, bb binary(100), nn nchar(100))",
+        )
+        taos_free_result(res)
+
+        stmt = taos_stmt_init(conn)
+
+        taos_stmt_prepare(stmt, "insert into log values(?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
+
+        params = new_bind_params(14)
+        params[0].timestamp(1626861392589, PrecisionEnum.Milliseconds)
+        params[1].null()
+        params[2].tinyint(2)
+        params[3].smallint(3)
+        params[4].int(4)
+        params[5].bigint(5)
+        params[6].tinyint_unsigned(6)
+        params[7].smallint_unsigned(7)
+        params[8].int_unsigned(8)
+        params[9].bigint_unsigned(9)
+        params[10].float(10.1)
+        params[11].double(10.11)
+        params[12].binary("hello")
+        params[13].nchar("stmt")
+        taos_stmt_bind_param(stmt, params)
+        taos_stmt_add_batch(stmt)
+        taos_stmt_execute(stmt)
+
+        res = taos_query(conn, "select * from log limit 1")
+
+        fields = taos_fetch_fields(res)
+        filed_count = taos_field_count(res)
+
+        row = taos_fetch_row_raw(res)
+        rowstr = taos_print_row(row, fields, filed_count, 100)
+
+        taos_free_result(res)
+        taos_query(conn, "drop database if exists " + dbname)
+        taos_close(conn)
+
+        assert rowstr == "1626861392589 NULL 2 3 4 5 6 7 8 9 10.100000 10.110000 hello stmt"
+    except Exception as err:
+        taos_query(conn, "drop database if exists " + dbname)
+        raise err
+
+def stream_callback(param, result, row):
+    # type: (c_void_p, c_void_p, c_void_p) -> None
+    try:
+        if result == None or row == None:
+            return
+        result = c_void_p(result)
+        row = c_void_p(row)
+        fields = taos_fetch_fields_raw(result)
+        num_fields = taos_field_count(result)
+        s = taos_print_row(row, fields, num_fields)
+        print(s)
+        taos_stop_query(result)
+    except Exception as err:
+        print(err)
+
+def test_stream(conn, caplog):
+    dbname = "pytest_ctaos_stream"
+    try:
+        res = taos_query(conn, "create database if not exists %s" % dbname)
+        taos_free_result(res)
+
+        taos_select_db(conn, dbname)
+
+        res = taos_query(
+            conn,
+            "create table if not exists log(ts timestamp, n int)",
+        )
+        taos_free_result(res)
+
+        res = taos_query(conn, "select count(*) from log interval(5s)")
+        cc = taos_num_fields(res)
+        assert cc == 2
+
+        stream = taos_open_stream(conn, "select count(*) from log interval(5s)", stream_callback, 0, None, None)
+        print("waiting for data")
+        time.sleep(1)
+
+        for i in range(0, 2):
+            res = taos_query(conn, "insert into log values(now,0)(now+1s, 1)(now + 2s, 2)")
+            taos_free_result(res)
+            time.sleep(2)
+        taos_close_stream(stream)
+        taos_query(conn, "drop database if exists " + dbname)
+        taos_close(conn)
+    except Exception as err:
+        taos_query(conn, "drop database if exists " + dbname)
+        raise err

src/connector/python/tests/test_info.py

+from taos.cinterface import *
+
+from taos import *
+
+import pytest
+
+@pytest.fixture
+def conn():
+    return connect()
+
+def test_client_info():
+    print(taos_get_client_info())
+    None
+
+def test_server_info(conn):
+    # type: (TaosConnection) -> None
+    print(conn.client_info)
+    print(conn.server_info)
+    None
+
+if __name__ == "__main__":
+    test_client_info()
+    test_server_info(connect())

src/connector/python/tests/test_lines.py

+from taos.error import OperationalError
+from taos import connect, new_bind_params, PrecisionEnum
+from taos import *
+
+from ctypes import *
+import taos
+import pytest
+
+
+@pytest.fixture
+def conn():
+    # type: () -> taos.TaosConnection
+    return connect()
+
+
+def test_insert_lines(conn):
+    # type: (TaosConnection) -> None
+
+    dbname = "pytest_taos_insert_lines"
+    try:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.execute("create database if not exists %s precision 'us'" % dbname)
+        conn.select_db(dbname)
+
+        lines = [
+            'st,t1=3i64,t2=4f64,t3="t3" c1=3i64,c3=L"passit",c2=false,c4=4f64 1626006833639000000ns',
+            'st,t1=4i64,t3="t4",t2=5f64,t4=5f64 c1=3i64,c3=L"passitagin",c2=true,c4=5f64,c5=5f64,c6=7u64 1626006933640000000ns',
+            'stf,t1=4i64,t3="t4",t2=5f64,t4=5f64 c1=3i64,c3=L"passitagin_stf",c2=false,c5=5f64,c6=7u64 1626006933641000000ns',
+        ]
+        conn.insert_lines(lines)
+        print("inserted")
+
+        lines = [
+            'stf,t1=5i64,t3="t4",t2=5f64,t4=5f64 c1=3i64,c3=L"passitagin_stf",c2=false,c5=5f64,c6=7u64 1626006933641000000ns',
+        ]
+        conn.insert_lines(lines)
+        print("inserted")
+        result = conn.query("select * from st")
+        print(*result.fields)
+        all = result.rows_iter()
+        for row in all:
+            print(row)
+        result.close()
+        print(result.row_count)
+
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+
+    except Exception as err:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+        print(err)
+        raise err
+
+
+if __name__ == "__main__":
+    test_insert_lines(connect())

src/connector/python/tests/test_query.py

+from datetime import datetime
+import taos
+import pytest
+
+@pytest.fixture
+def conn():
+    return taos.connect()
+
+def test_query(conn):
+    """This test will use fetch_block for rows fetching, significantly faster than rows_iter"""
+    result = conn.query("select * from log.log limit 10000")
+    fields = result.fields
+    for field in fields:
+        print("field: %s" % field)
+    start = datetime.now()
+    for row in result:
+        # print(row)
+        None
+    end = datetime.now()
+    elapsed = end - start
+    print("elapsed time: ", elapsed)
+    result.close()
+    conn.close()
+
+def test_query_row_iter(conn):
+    """This test will use fetch_row for each row fetching, this is the only way in async callback"""
+    result = conn.query("select * from log.log limit 10000")
+    fields = result.fields
+    for field in fields:
+        print("field: %s" % field)
+    start = datetime.now()
+    for row in result.rows_iter():
+        # print(row)
+        None
+    end = datetime.now()
+    elapsed = end - start
+    print("elapsed time: ", elapsed)
+    result.close()
+    conn.close()
+
+if __name__ == "__main__":
+    test_query(taos.connect(database = "log"))
+    test_query_row_iter(taos.connect(database = "log"))

src/connector/python/tests/test_query_a.py

+from taos import *
+from ctypes import *
+import taos
+import pytest
+import time
+
+
+@pytest.fixture
+def conn():
+    return taos.connect()
+
+def fetch_callback(p_param, p_result, num_of_rows):
+    print("fetched ", num_of_rows, "rows")
+    p = cast(p_param, POINTER(Counter))
+    result = TaosResult(p_result)
+
+    if num_of_rows == 0:
+        print("fetching completed")
+        p.contents.done = True
+        result.close()
+        return
+    if num_of_rows < 0:
+        p.contents.done = True
+        result.check_error(num_of_rows)
+        result.close()
+        return None
+    
+    for row in result.rows_iter(num_of_rows):
+        # print(row)
+        None
+    p.contents.count += result.row_count
+    result.fetch_rows_a(fetch_callback, p_param)
+    
+
+
+def query_callback(p_param, p_result, code):
+    # type: (c_void_p, c_void_p, c_int) -> None
+    if p_result == None:
+        return
+    result = TaosResult(p_result)
+    if code == 0:
+        result.fetch_rows_a(fetch_callback, p_param)
+    result.check_error(code)
+
+
+class Counter(Structure):
+    _fields_ = [("count", c_int), ("done", c_bool)]
+
+    def __str__(self):
+        return "{ count: %d, done: %s }" % (self.count, self.done)
+
+
+def test_query(conn):
+    # type: (TaosConnection) -> None
+    counter = Counter(count=0)
+    conn.query_a("select * from log.log", query_callback, byref(counter))
+
+    while not counter.done:
+        print("wait query callback")
+        time.sleep(1)
+    print(counter)
+    conn.close()
+
+
+if __name__ == "__main__":
+    test_query(taos.connect())

src/connector/python/tests/test_stmt.py

+from taos import *
+
+from ctypes import *
+from datetime import datetime
+import taos
+import pytest
+
+@pytest.fixture
+def conn():
+    # type: () -> taos.TaosConnection
+    return connect()
+
+def test_stmt_insert(conn):
+    # type: (TaosConnection) -> None
+
+    dbname = "pytest_taos_stmt"
+    try:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.execute("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+
+        conn.execute(
+            "create table if not exists log(ts timestamp, bo bool, nil tinyint, ti tinyint, si smallint, ii int,\
+             bi bigint, tu tinyint unsigned, su smallint unsigned, iu int unsigned, bu bigint unsigned, \
+             ff float, dd double, bb binary(100), nn nchar(100), tt timestamp)",
+        )
+        conn.load_table_info("log")
+        
+
+        stmt = conn.statement("insert into log values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
+        params = new_bind_params(16)
+        params[0].timestamp(1626861392589, PrecisionEnum.Milliseconds)
+        params[1].bool(True)
+        params[2].null()
+        params[3].tinyint(2)
+        params[4].smallint(3)
+        params[5].int(4)
+        params[6].bigint(5)
+        params[7].tinyint_unsigned(6)
+        params[8].smallint_unsigned(7)
+        params[9].int_unsigned(8)
+        params[10].bigint_unsigned(9)
+        params[11].float(10.1)
+        params[12].double(10.11)
+        params[13].binary("hello")
+        params[14].nchar("stmt")
+        params[15].timestamp(1626861392589, PrecisionEnum.Milliseconds)
+
+        stmt.bind_param(params)
+        stmt.execute()
+
+        result = stmt.use_result()
+        assert result.affected_rows == 1
+        result.close()
+        stmt.close()
+
+        stmt = conn.statement("select * from log")
+        stmt.execute()
+        result = stmt.use_result()
+        row  = result.next()
+        print(row)
+        assert row[2] == None
+        for i in range(3, 11):
+            assert row[i] == i - 1
+        #float == may not work as expected
+        # assert row[10] == c_float(10.1)
+        assert row[12] == 10.11
+        assert row[13] == "hello"
+        assert row[14] == "stmt"
+
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+
+    except Exception as err:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+        raise err
+
+def test_stmt_insert_multi(conn):
+    # type: (TaosConnection) -> None
+
+    dbname = "pytest_taos_stmt_multi"
+    try:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.execute("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+
+        conn.execute(
+            "create table if not exists log(ts timestamp, bo bool, nil tinyint, ti tinyint, si smallint, ii int,\
+             bi bigint, tu tinyint unsigned, su smallint unsigned, iu int unsigned, bu bigint unsigned, \
+             ff float, dd double, bb binary(100), nn nchar(100), tt timestamp)",
+        )
+        conn.load_table_info("log")
+
+        start = datetime.now()
+        stmt = conn.statement("insert into log values(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)")
+        
+        params = new_multi_binds(16)
+        params[0].timestamp((1626861392589, 1626861392590, 1626861392591))
+        params[1].bool((True, None, False))
+        params[2].tinyint([-128, -128, None]) # -128 is tinyint null
+        params[3].tinyint([0, 127, None])
+        params[4].smallint([3, None, 2])
+        params[5].int([3, 4, None])
+        params[6].bigint([3, 4, None])
+        params[7].tinyint_unsigned([3, 4, None])
+        params[8].smallint_unsigned([3, 4, None])
+        params[9].int_unsigned([3, 4, None])
+        params[10].bigint_unsigned([3, 4, None])
+        params[11].float([3, None, 1])
+        params[12].double([3, None, 1.2])
+        params[13].binary(["abc", "dddafadfadfadfadfa", None])
+        params[14].nchar(["涛思数据", None, "a long string with 中文字符"])
+        params[15].timestamp([None, None, 1626861392591])
+        stmt.bind_param_batch(params)
+        
+        stmt.execute()
+        end = datetime.now()
+        print("elapsed time: ", end - start)
+        result = stmt.use_result()
+        assert result.affected_rows == 3
+        result.close()
+        stmt.close()
+
+        stmt = conn.statement("select * from log")
+        stmt.execute()
+        result = stmt.use_result()
+        for row in result:
+            print(row)
+        result.close()
+
+        stmt.close()
+
+        # start = datetime.now()
+        # conn.query("insert into log values(1626861392660, true, NULL, 0, 3,3,3,3,3,3,3,3.0,3.0, 'abc','涛思数据',NULL)(1626861392661, true, NULL, 0, 3,3,3,3,3,3,3,3.0,3.0, 'abc','涛思数据',NULL)(1626861392662, true, NULL, 0, 3,3,3,3,3,3,3,3.0,3.0, 'abc','涛思数据',NULL)")
+
+        # end = datetime.now()
+        # print("elapsed time: ", end - start)
+
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+
+    except Exception as err:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+        raise err
+if __name__ == "__main__":
+    test_stmt_insert(connect())
+    test_stmt_insert_multi(connect())
\ No newline at end of file

src/connector/python/tests/test_stream.py

+from taos.cinterface import *
+from taos.precision import *
+from taos.bind import *
+from taos import *
+from ctypes import *
+import time
+import pytest
+
+
+@pytest.fixture
+def conn():
+    return connect()
+
+
+def stream_callback(p_param, p_result, p_row):
+    # type: (c_void_p, c_void_p, c_void_p) -> None
+
+    if p_result == None or p_row == None:
+        return
+    result = TaosResult(p_result)
+    row = TaosRow(result, p_row)
+    try:
+        ts, count = row()
+        p = cast(p_param, POINTER(Counter))
+        p.contents.count += count
+        print("[%s] inserted %d in 5s, total count: %d" % (ts.strftime("%Y-%m-%d %H:%M:%S"), count, p.contents.count))
+
+    except Exception as err:
+        print(err)
+        raise err
+
+
+class Counter(ctypes.Structure):
+    _fields_ = [
+        ("count", c_int),
+    ]
+
+    def __str__(self):
+        return "%d" % self.count
+
+
+def test_stream(conn):
+    # type: (TaosConnection) -> None
+    dbname = "pytest_taos_stream"
+    try:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.execute("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+        conn.execute("create table if not exists log(ts timestamp, n int)")
+
+        result = conn.query("select count(*) from log interval(5s)")
+        assert result.field_count == 2
+        counter = Counter()
+        counter.count = 0
+        stream = conn.stream("select count(*) from log interval(5s)", stream_callback, param=byref(counter))
+
+        for _ in range(0, 20):
+            conn.execute("insert into log values(now,0)(now+1s, 1)(now + 2s, 2)")
+            time.sleep(2)
+        stream.close()
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+    except Exception as err:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+        raise err
+
+
+if __name__ == "__main__":
+    test_stream(connect())

src/connector/python/tests/test_subscribe.py

+from taos.subscription import TaosSubscription
+from taos import *
+from ctypes import *
+import taos
+import pytest
+import time
+from random import random
+
+
+@pytest.fixture
+def conn():
+    return taos.connect()
+
+
+def test_subscribe(conn):
+    # type: (TaosConnection) -> None
+
+    dbname = "pytest_taos_subscribe_callback"
+    try:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.execute("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+        conn.execute("create table if not exists log(ts timestamp, n int)")
+        for i in range(10):
+            conn.execute("insert into log values(now, %d)" % i)
+
+        sub = conn.subscribe(True, "test", "select * from log", 1000)
+        print("# consume from begin")
+        for ts, n in sub.consume():
+            print(ts, n)
+        
+        print("# consume new data")
+        for i in range(5):
+            conn.execute("insert into log values(now, %d)(now+1s, %d)" % (i, i))
+            result = sub.consume()
+            for ts, n in result:
+                print(ts, n)
+        
+        print("# consume with a stop condition")
+        for i in range(10):
+            conn.execute("insert into log values(now, %d)" % int(random() * 10))
+            result = sub.consume()
+            try:
+                ts, n = next(result)
+                print(ts, n)
+                if n > 5:
+                    result.stop_query()
+                    print("## stopped")
+                    break
+            except StopIteration:
+                continue
+
+        sub.close()
+
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+    except Exception as err:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+        raise err
+
+
+def subscribe_callback(p_sub, p_result, p_param, errno):
+    # type: (c_void_p, c_void_p, c_void_p, c_int) -> None
+    print("callback")
+    result = TaosResult(p_result)
+    result.check_error(errno)
+    for row in result.rows_iter():
+        ts, n = row()
+        print(ts, n)
+
+
+def test_subscribe_callback(conn):
+    # type: (TaosConnection) -> None
+    dbname = "pytest_taos_subscribe_callback"
+    try:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.execute("create database if not exists %s" % dbname)
+        conn.select_db(dbname)
+        conn.execute("create table if not exists log(ts timestamp, n int)")
+
+        print("# subscribe with callback")
+        sub = conn.subscribe(False, "test", "select * from log", 1000, subscribe_callback)
+
+        for i in range(10):
+            conn.execute("insert into log values(now, %d)" % i)
+            time.sleep(0.7)
+        sub.close()
+
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+    except Exception as err:
+        conn.execute("drop database if exists %s" % dbname)
+        conn.close()
+        raise err
+
+
+if __name__ == "__main__":
+    test_subscribe(taos.connect())
+    test_subscribe_callback(taos.connect())

tests/pytest/insert/line_insert.py

@@ -42,18 +42,18 @@ class TDTestCase:
                     "stf,t1=4i64,t3=\"t4\",t2=5f64,t4=5f64 c1=3i64,c3=L\"passitagin_stf\",c2=false,c5=5f64,c6=7u64 1626006933641000000ns"
                 ]
 
-        code = self._conn.insertLines(lines)
-        print("insertLines result {}".format(code))
+        code = self._conn.insert_lines(lines)
+        print("insert_lines result {}".format(code))
 
         lines2 = [  "stg,t1=3i64,t2=4f64,t3=\"t3\" c1=3i64,c3=L\"passit\",c2=false,c4=4f64 1626006833639000000ns",
                     "stg,t1=4i64,t3=\"t4\",t2=5f64,t4=5f64 c1=3i64,c3=L\"passitagin\",c2=true,c4=5f64,c5=5f64 1626006833640000000ns"
                 ]
         
-        code = self._conn.insertLines([ lines2[0] ])
-        print("insertLines result {}".format(code))
+        code = self._conn.insert_lines([ lines2[0] ])
+        print("insert_lines result {}".format(code))
 
-        self._conn.insertLines([ lines2[1] ])
-        print("insertLines result {}".format(code))
+        self._conn.insert_lines([ lines2[1] ])
+        print("insert_lines result {}".format(code))
 
         tdSql.query("select * from st")
         tdSql.checkRows(4)
@@ -73,7 +73,7 @@ class TDTestCase:
         tdSql.query("describe stf")
         tdSql.checkData(2, 2, 14)
 
-        self._conn.insertLines([
+        self._conn.insert_lines([
                                 "sth,t1=4i64,t2=5f64,t4=5f64,ID=\"childtable\" c1=3i64,c3=L\"passitagin_stf\",c2=false,c5=5f64,c6=7u64 1626006933641ms",
                                 "sth,t1=4i64,t2=5f64,t4=5f64 c1=3i64,c3=L\"passitagin_stf\",c2=false,c5=5f64,c6=7u64 1626006933654ms"                    
                                 ])

tests/pytest/insert/schemalessInsert.py

@@ -11,8 +11,10 @@
 
 # -*- coding: utf-8 -*-
 
+import traceback
 import random
 import string
+from taos.error import LinesError
 import time
 from copy import deepcopy
 import numpy as np
@@ -292,7 +294,7 @@ class TDTestCase:
 
     def resCmp(self, input_sql, stb_name, query_sql="select * from", condition="", ts=None, id=True, none_check_tag=None):
         expect_list = self.inputHandle(input_sql)
-        self._conn.insertLines([input_sql])
+        self._conn.insert_lines([input_sql])
         query_sql = f"{query_sql} {stb_name} {condition}"
         res_row_list, res_field_list_without_ts, res_type_list = self.resHandle(query_sql, True)
         if ts == 0:
@@ -312,7 +314,9 @@ class TDTestCase:
                     expect_list[0].pop(j)
             tdSql.checkEqual(res_row_list[0], expect_list[0])
         tdSql.checkEqual(res_field_list_without_ts, expect_list[1])
-        tdSql.checkEqual(res_type_list, expect_list[2])
+        for i in range(len(res_type_list)):
+            tdSql.checkEqual(res_type_list[i], expect_list[2][i])
+        # tdSql.checkEqual(res_type_list, expect_list[2])
 
     def cleanStb(self):
         query_sql = "show stables"
@@ -405,13 +409,14 @@ class TDTestCase:
         """
         for input_sql in [self.genLongSql(128, 1)[0], self.genLongSql(1, 4094)[0]]:
             self.cleanStb()
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkEqual(code, 0)
+            self._conn.insert_lines([input_sql])
         for input_sql in [self.genLongSql(129, 1)[0], self.genLongSql(1, 4095)[0]]:
             self.cleanStb()
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
-
+            try:
+                self._conn.insert_lines([input_sql])
+            except LinesError:
+                pass
+            
     def idIllegalNameCheckCase(self):
         """
             test illegal id name
@@ -421,8 +426,10 @@ class TDTestCase:
         rstr = list("`~!@#$¥%^&*()-+={}|[]、「」【】\:;《》<>?")
         for i in rstr:
             input_sql = self.genFullTypeSql(tb_name=f"\"aaa{i}bbb\"")[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+            except LinesError:
+                pass
 
     def idStartWithNumCheckCase(self):
         """
@@ -430,8 +437,10 @@ class TDTestCase:
         """
         self.cleanStb()
         input_sql = self.genFullTypeSql(tb_name=f"\"1aaabbb\"")[0]
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+        except LinesError:
+            pass
 
     def nowTsCheckCase(self):
         """
@@ -439,8 +448,10 @@ class TDTestCase:
         """
         self.cleanStb()
         input_sql = self.genFullTypeSql(ts="now")[0]
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+        except LinesError:
+            pass
 
     def dateFormatTsCheckCase(self):
         """
@@ -448,8 +459,10 @@ class TDTestCase:
         """
         self.cleanStb()
         input_sql = self.genFullTypeSql(ts="2021-07-21\ 19:01:46.920")[0]
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+        except LinesError:
+            pass
     
     def illegalTsCheckCase(self):
         """
@@ -457,8 +470,10 @@ class TDTestCase:
         """
         self.cleanStb()
         input_sql = self.genFullTypeSql(ts="16260068336390us19")[0]
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+        except LinesError:
+            pass
 
     def tagValueLengthCheckCase(self):
         """
@@ -471,8 +486,10 @@ class TDTestCase:
             self.resCmp(input_sql, stb_name)
         for t1 in ["-128i8", "128i8"]:
             input_sql = self.genFullTypeSql(t1=t1)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+            except LinesError:
+                pass
 
         #i16
         for t2 in ["-32767i16", "32767i16"]:
@@ -480,8 +497,10 @@ class TDTestCase:
             self.resCmp(input_sql, stb_name)
         for t2 in ["-32768i16", "32768i16"]:
             input_sql = self.genFullTypeSql(t2=t2)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+            except LinesError:
+                pass
 
         #i32
         for t3 in ["-2147483647i32", "2147483647i32"]:
@@ -489,8 +508,10 @@ class TDTestCase:
             self.resCmp(input_sql, stb_name)
         for t3 in ["-2147483648i32", "2147483648i32"]:
             input_sql = self.genFullTypeSql(t3=t3)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+            except LinesError:
+                pass
 
         #i64
         for t4 in ["-9223372036854775807i64", "9223372036854775807i64"]:
@@ -498,8 +519,10 @@ class TDTestCase:
             self.resCmp(input_sql, stb_name)
         for t4 in ["-9223372036854775808i64", "9223372036854775808i64"]:
             input_sql = self.genFullTypeSql(t4=t4)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+            except LinesError:
+                pass
 
         # f32
         for t5 in [f"{-3.4028234663852885981170418348451692544*(10**38)}f32", f"{3.4028234663852885981170418348451692544*(10**38)}f32"]:
@@ -508,8 +531,12 @@ class TDTestCase:
         # * limit set to 4028234664*(10**38)
         for t5 in [f"{-3.4028234664*(10**38)}f32", f"{3.4028234664*(10**38)}f32"]:
             input_sql = self.genFullTypeSql(t5=t5)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
+
 
         # f64
         for t6 in [f'{-1.79769*(10**308)}f64', f'{-1.79769*(10**308)}f64']:
@@ -518,27 +545,36 @@ class TDTestCase:
         # * limit set to 1.797693134862316*(10**308)
         for c6 in [f'{-1.797693134862316*(10**308)}f64', f'{-1.797693134862316*(10**308)}f64']:
             input_sql = self.genFullTypeSql(c6=c6)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
 
         # binary 
         stb_name = self.getLongName(7, "letters")
         input_sql = f'{stb_name},t0=t,t1="{self.getLongName(16374, "letters")}" c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines([input_sql])
+        
         input_sql = f'{stb_name},t0=t,t1="{self.getLongName(16375, "letters")}" c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            pass
 
         # nchar
         # * legal nchar could not be larger than 16374/4
         stb_name = self.getLongName(7, "letters")
         input_sql = f'{stb_name},t0=t,t1=L"{self.getLongName(4093, "letters")}" c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines([input_sql])
+
         input_sql = f'{stb_name},t0=t,t1=L"{self.getLongName(4094, "letters")}" c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
 
     def colValueLengthCheckCase(self):
         """
@@ -552,16 +588,22 @@ class TDTestCase:
 
         for c1 in ["-128i8", "128i8"]:
             input_sql = self.genFullTypeSql(c1=c1)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
         # i16
         for c2 in ["-32767i16"]:
             input_sql, stb_name = self.genFullTypeSql(c2=c2)
             self.resCmp(input_sql, stb_name)
         for c2 in ["-32768i16", "32768i16"]:
             input_sql = self.genFullTypeSql(c2=c2)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
 
         # i32
         for c3 in ["-2147483647i32"]:
@@ -569,8 +611,11 @@ class TDTestCase:
             self.resCmp(input_sql, stb_name)
         for c3 in ["-2147483648i32", "2147483648i32"]:
             input_sql = self.genFullTypeSql(c3=c3)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
 
         # i64
         for c4 in ["-9223372036854775807i64"]:
@@ -578,8 +623,11 @@ class TDTestCase:
             self.resCmp(input_sql, stb_name)
         for c4 in ["-9223372036854775808i64", "9223372036854775808i64"]:
             input_sql = self.genFullTypeSql(c4=c4)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
 
         # f32       
         for c5 in [f"{-3.4028234663852885981170418348451692544*(10**38)}f32", f"{3.4028234663852885981170418348451692544*(10**38)}f32"]:
@@ -588,8 +636,11 @@ class TDTestCase:
         # * limit set to 4028234664*(10**38)
         for c5 in [f"{-3.4028234664*(10**38)}f32", f"{3.4028234664*(10**38)}f32"]:
             input_sql = self.genFullTypeSql(c5=c5)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
 
         # f64
         for c6 in [f'{-1.79769313486231570814527423731704356798070567525844996598917476803157260780*(10**308)}f64', f'{-1.79769313486231570814527423731704356798070567525844996598917476803157260780*(10**308)}f64']:
@@ -598,27 +649,36 @@ class TDTestCase:
         # * limit set to 1.797693134862316*(10**308)
         for c6 in [f'{-1.797693134862316*(10**308)}f64', f'{-1.797693134862316*(10**308)}f64']:
             input_sql = self.genFullTypeSql(c6=c6)[0]
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
 
         # # binary 
         stb_name = self.getLongName(7, "letters")
         input_sql = f'{stb_name},t0=t c0=f,c1="{self.getLongName(16374, "letters")}" 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines([input_sql])
+        
         input_sql = f'{stb_name},t0=t c0=f,c1="{self.getLongName(16375, "letters")}" 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
 
         # nchar
         # * legal nchar could not be larger than 16374/4
         stb_name = self.getLongName(7, "letters")
         input_sql = f'{stb_name},t0=t c0=f,c1=L"{self.getLongName(4093, "letters")}" 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines([input_sql])
+
         input_sql = f'{stb_name},t0=t c0=f,c1=L"{self.getLongName(4094, "letters")}" 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
 
     def tagColIllegalValueCheckCase(self):
 
@@ -629,11 +689,17 @@ class TDTestCase:
         # bool
         for i in ["TrUe", "tRue", "trUe", "truE", "FalsE", "fAlse", "faLse", "falSe", "falsE"]:
             input_sql1 = self.genFullTypeSql(t0=i)[0]
-            code = self._conn.insertLines([input_sql1])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql1])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
             input_sql2 = self.genFullTypeSql(c0=i)[0]
-            code = self._conn.insertLines([input_sql2])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql2])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
 
         # i8 i16 i32 i64 f32 f64
         for input_sql in [
@@ -651,8 +717,11 @@ class TDTestCase:
                 self.genFullTypeSql(c6="11.1s45f64")[0],
                 self.genFullTypeSql(c9="1s1u64")[0]
             ]:
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
 
         # check binary and nchar blank
         stb_name = self.getLongName(7, "letters")
@@ -661,18 +730,19 @@ class TDTestCase:
         input_sql3 = f'{stb_name},t0=t,t1="abc aaa" c0=f 1626006833639000000ns'
         input_sql4 = f'{stb_name},t0=t,t1=L"abc aaa" c0=f 1626006833639000000ns'
         for input_sql in [input_sql1, input_sql2, input_sql3, input_sql4]:
-            code = self._conn.insertLines([input_sql])
-            tdSql.checkNotEqual(code, 0)
+            try:
+                self._conn.insert_lines([input_sql])
+                raise Exception("should not reach here")
+            except LinesError as err:
+                tdSql.checkNotEqual(err.errno, 0)
 
         # check accepted binary and nchar symbols 
         # # * ~!@#$¥%^&*()-+={}|[]、「」:;
         for symbol in list('~!@#$¥%^&*()-+={}|[]、「」:;'):
             input_sql1 = f'{stb_name},t0=t c0=f,c1="abc{symbol}aaa" 1626006833639000000ns'
             input_sql2 = f'{stb_name},t0=t,t1="abc{symbol}aaa" c0=f 1626006833639000000ns'
-            code = self._conn.insertLines([input_sql1])
-            tdSql.checkEqual(code, 0)
-            code = self._conn.insertLines([input_sql2])
-            tdSql.checkEqual(code, 0)
+            self._conn.insert_lines([input_sql1])
+            self._conn.insert_lines([input_sql2])
         
 
     def duplicateIdTagColInsertCheckCase(self):
@@ -681,23 +751,35 @@ class TDTestCase:
         """
         self.cleanStb()
         input_sql_id = self.genFullTypeSql(id_double_tag=True)[0]
-        code = self._conn.insertLines([input_sql_id])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql_id])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
 
         input_sql = self.genFullTypeSql()[0]
         input_sql_tag = input_sql.replace("t5", "t6")
-        code = self._conn.insertLines([input_sql_tag])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql_tag])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
 
         input_sql = self.genFullTypeSql()[0]
         input_sql_col = input_sql.replace("c5", "c6")
-        code = self._conn.insertLines([input_sql_col])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql_col])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
 
         input_sql = self.genFullTypeSql()[0]
         input_sql_col = input_sql.replace("c5", "C6")
-        code = self._conn.insertLines([input_sql_col])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql_col])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
 
     ##### stb exist #####
     def noIdStbExistCheckCase(self):
@@ -720,8 +802,7 @@ class TDTestCase:
         self.cleanStb()
         input_sql, stb_name = self.genFullTypeSql()
         self.resCmp(input_sql, stb_name)
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines([input_sql])
         self.resCmp(input_sql, stb_name)
 
     def tagColBinaryNcharLengthCheckCase(self):
@@ -788,7 +869,7 @@ class TDTestCase:
         tdSql.checkRows(1)
         tdSql.checkEqual(tb_name1, tb_name2)
         input_sql, stb_name = self.genFullTypeSql(stb_name=stb_name, t0="f", c0="f", id_noexist_tag=True, ct_add_tag=True)
-        self._conn.insertLines([input_sql])
+        self._conn.insert_lines([input_sql])
         tb_name3 = self.getNoIdTbName(stb_name)
         tdSql.query(f"select * from {stb_name}")
         tdSql.checkRows(2)
@@ -803,29 +884,35 @@ class TDTestCase:
         stb_name = self.getLongName(7, "letters")
         tb_name = f'{stb_name}_1'
         input_sql = f'{stb_name},id="{tb_name}",t0=t c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
+        self._conn.insert_lines([input_sql])
 
         # * every binary and nchar must be length+2, so here is two tag, max length could not larger than 16384-2*2
         input_sql = f'{stb_name},t0=t,t1="{self.getLongName(16374, "letters")}",t2="{self.getLongName(5, "letters")}" c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines([input_sql])
+        
         tdSql.query(f"select * from {stb_name}")
         tdSql.checkRows(2)
         input_sql = f'{stb_name},t0=t,t1="{self.getLongName(16374, "letters")}",t2="{self.getLongName(6, "letters")}" c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+            raise Exception("should not reach here")
+        except LinesError:
+            pass
         tdSql.query(f"select * from {stb_name}")
         tdSql.checkRows(2)
 
         # # * check col，col+ts max in describe ---> 16143
         input_sql = f'{stb_name},t0=t c0=f,c1="{self.getLongName(16374, "letters")}",c2="{self.getLongName(16374, "letters")}",c3="{self.getLongName(16374, "letters")}",c4="{self.getLongName(12, "letters")}" 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines([input_sql])
+
         tdSql.query(f"select * from {stb_name}")
         tdSql.checkRows(3)
         input_sql = f'{stb_name},t0=t c0=f,c1="{self.getLongName(16374, "letters")}",c2="{self.getLongName(16374, "letters")}",c3="{self.getLongName(16374, "letters")}",c4="{self.getLongName(13, "letters")}" 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
         tdSql.query(f"select * from {stb_name}")
         tdSql.checkRows(3)
     
@@ -838,28 +925,32 @@ class TDTestCase:
         stb_name = self.getLongName(7, "letters")
         tb_name = f'{stb_name}_1'
         input_sql = f'{stb_name},id="{tb_name}",t0=t c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
+        code = self._conn.insert_lines([input_sql])
 
         # * legal nchar could not be larger than 16374/4
         input_sql = f'{stb_name},t0=t,t1=L"{self.getLongName(4093, "letters")}",t2=L"{self.getLongName(1, "letters")}" c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines([input_sql])
         tdSql.query(f"select * from {stb_name}")
         tdSql.checkRows(2)
         input_sql = f'{stb_name},t0=t,t1=L"{self.getLongName(4093, "letters")}",t2=L"{self.getLongName(2, "letters")}" c0=f 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
         tdSql.query(f"select * from {stb_name}")
         tdSql.checkRows(2)
 
         input_sql = f'{stb_name},t0=t c0=f,c1=L"{self.getLongName(4093, "letters")}",c2=L"{self.getLongName(4093, "letters")}",c3=L"{self.getLongName(4093, "letters")}",c4=L"{self.getLongName(4, "letters")}" 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines([input_sql])
         tdSql.query(f"select * from {stb_name}")
         tdSql.checkRows(3)
         input_sql = f'{stb_name},t0=t c0=f,c1=L"{self.getLongName(4093, "letters")}",c2=L"{self.getLongName(4093, "letters")}",c3=L"{self.getLongName(4093, "letters")}",c4=L"{self.getLongName(5, "letters")}" 1626006833639000000ns'
-        code = self._conn.insertLines([input_sql])
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines([input_sql])
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
         tdSql.query(f"select * from {stb_name}")
         tdSql.checkRows(3)
 
@@ -880,8 +971,7 @@ class TDTestCase:
                 "st123456,t1=4i64,t3=\"t4\",t2=5f64,t4=5f64 c1=3i64,c3=L\"passitagin\",c2=true,c4=5f64,c5=5f64,c6=7u64 1626006933640000000ns",
                 "st123456,t1=4i64,t3=\"t4\",t2=5f64,t4=5f64 c1=3i64,c3=L\"passitagin_stf\",c2=false,c5=5f64,c6=7u64 1626006933641000000ns"
                 ]
-        code = self._conn.insertLines(lines)
-        tdSql.checkEqual(code, 0)
+        self._conn.insert_lines(lines)
     
     def multiInsertCheckCase(self, count):
             """
@@ -894,8 +984,7 @@ class TDTestCase:
             for i in range(count):
                 input_sql = self.genFullTypeSql(stb_name=stb_name, t7=f'"{self.getLongName(8, "letters")}"', c7=f'"{self.getLongName(8, "letters")}"', id_noexist_tag=True)[0]
                 sql_list.append(input_sql)
-            code = self._conn.insertLines(sql_list)
-            tdSql.checkEqual(code, 0)
+            self._conn.insert_lines(sql_list)
 
     def batchErrorInsertCheckCase(self):
         """
@@ -905,8 +994,11 @@ class TDTestCase:
         stb_name = self.getLongName(8, "letters")
         lines = ["st123456,t1=3i64,t2=4f64,t3=\"t3\" c1=3i64,c3=L\"passit\",c2=false,c4=4f64 1626006833639000000ns",
                 f"{stb_name},t2=5f64,t3=L\"ste\" c1=tRue,c2=4i64,c3=\"iam\" 1626056811823316532ns"]
-        code = self._conn.insertLines(lines)
-        tdSql.checkNotEqual(code, 0)
+        try:
+            self._conn.insert_lines(lines)
+            raise Exception("should not reach here")
+        except LinesError as err:
+            tdSql.checkNotEqual(err.errno, 0)
 
     def genSqlList(self, count=5, stb_name="", tb_name=""):
         """
@@ -957,7 +1049,7 @@ class TDTestCase:
     def genMultiThreadSeq(self, sql_list):
         tlist = list()
         for insert_sql in sql_list:
-            t = threading.Thread(target=self._conn.insertLines,args=([insert_sql[0]],))
+            t = threading.Thread(target=self._conn.insert_lines,args=([insert_sql[0]],))
             tlist.append(t)
         return tlist
 
@@ -1155,16 +1247,18 @@ class TDTestCase:
     def test(self):
         input_sql1 = "rfasta,id=\"rfasta_1\",t0=true,t1=127i8,t2=32767i16,t3=2147483647i32,t4=9223372036854775807i64,t5=11.12345f32,t6=22.123456789f64,t7=\"ddzhiksj\",t8=L\"ncharTagValue\" c0=True,c1=127i8,c2=32767i16,c3=2147483647i32,c4=9223372036854775807i64,c5=11.12345f32,c6=22.123456789f64,c7=\"bnhwlgvj\",c8=L\"ncharTagValue\",c9=7u64 1626006933640000000ns"
         input_sql2 = "rfasta,id=\"rfasta_1\",t0=true,t1=127i8,t2=32767i16,t3=2147483647i32,t4=9223372036854775807i64,t5=11.12345f32,t6=22.123456789f64 c0=True,c1=127i8,c2=32767i16,c3=2147483647i32,c4=9223372036854775807i64,c5=11.12345f32,c6=22.123456789f64 1626006933640000000ns"
-        code = self._conn.insertLines([input_sql1])
-        code = self._conn.insertLines([input_sql2])
-        print(code)
-        # self._conn.insertLines([input_sql2])
+        try:
+            self._conn.insert_lines([input_sql1])
+            self._conn.insert_lines([input_sql2])
+        except LinesError as err:
+            print(err.errno)
+        # self._conn.insert_lines([input_sql2])
         # input_sql3 = f'abcd,id="cc¥Ec",t0=True,t1=127i8,t2=32767i16,t3=2147483647i32,t4=9223372036854775807i64,t5=11.12345f32,t6=22.123456789f64,t7="ndsfdrum",t8=L"ncharTagValue" c0=f,c1=127i8,c2=32767i16,c3=2147483647i32,c4=9223372036854775807i64,c5=11.12345f32,c6=22.123456789f64,c7="igwoehkm",c8=L"ncharColValue",c9=7u64 0'
         # print(input_sql3)
         # input_sql4 = 'hmemeb,id="kilrcrldgf",t0=F,t1=127i8,t2=32767i16,t3=2147483647i32,t4=9223372036854775807i64,t5=11.12345f32,t6=22.123456789f64,t7="fysodjql",t8=L"ncharTagValue" c0=True,c1=127i8,c2=32767i16,c3=2147483647i32,c4=9223372036854775807i64,c5=11.12345f32,c6=22.123456789f64,c7="waszbfvc",c8=L"ncharColValue",c9=7u64 0'
-        # code = self._conn.insertLines([input_sql3])
+        # code = self._conn.insert_lines([input_sql3])
         # print(code)
-        # self._conn.insertLines([input_sql4])
+        # self._conn.insert_lines([input_sql4])
 
     def runAll(self):
         self.initCheckCase()
@@ -1222,7 +1316,11 @@ class TDTestCase:
     def run(self):
         print("running {}".format(__file__))
         self.createDb()
-        self.runAll()
+        try:
+            self.runAll()
+        except Exception as err:
+            print(''.join(traceback.format_exception(None, err, err.__traceback__)))
+            raise err
         # self.tagColIllegalValueCheckCase()
         # self.test()
 

tests/pytest/util/sub.py

@@ -29,9 +29,10 @@ class TDSub:
 		self.sub.close(keepProgress)	
 
 	def consume(self):
-		self.data = self.sub.consume()
-		self.consumedRows = len(self.data)
-		self.consumedCols = len(self.sub.fields)
+		self.result = self.sub.consume()
+		self.result.fetch_all()
+		self.consumedRows = self.result.row_count
+		self.consumedCols = self.result.field_count
 		return self.consumedRows
 
 	def checkRows(self, expectRows):