Merge branch 'develop' into test/jenkins

documentation20/cn/04.model/docs.md

@@ -43,7 +43,7 @@ CREATE STABLE meters (ts timestamp, current float, voltage int, phase float) TAG
 ## <a class="anchor" id="create-table"></a>创建表
 
 TDengine对每个数据采集点需要独立建表。与标准的关系型数据一样，一张表有表名，Schema，但除此之外，还可以带有一到多个标签。创建时，需要使用超级表做模板，同时指定标签的具体值。以表一中的智能电表为例，可以使用如下的SQL命令建表：
-```cmd
+```mysql
 CREATE TABLE d1001 USING meters TAGS ("Beijing.Chaoyang", 2);
 ```
 其中d1001是表名，meters是超级表的表名，后面紧跟标签Location的具体标签值”Beijing.Chaoyang"，标签groupId的具体标签值2。虽然在创建表时，需要指定标签值，但可以事后修改。详细细则请见 [TAOS SQL 的表管理](https://www.taosdata.com/cn/documentation/taos-sql#table) 章节。
@@ -54,10 +54,12 @@ TDengine建议将数据采集点的全局唯一ID作为表名(比如设备序列
 
 **自动建表**：在某些特殊场景中，用户在写数据时并不确定某个数据采集点的表是否存在，此时可在写入数据时使用自动建表语法来创建不存在的表，若该表已存在则不会建立新表。比如：
 
-```cmd
+```mysql
 INSERT INTO d1001 USING METERS TAGS ("Beijng.Chaoyang", 2) VALUES (now, 10.2, 219, 0.32);
 ```
-上述SQL语句将记录(now, 10.2, 219, 0.32) 插入进表d1001。如果表d1001还未创建，则使用超级表meters做模板自动创建，同时打上标签值“Beijing.Chaoyang", 2。  
+上述SQL语句将记录 (now, 10.2, 219, 0.32) 插入表d1001。如果表d1001还未创建，则使用超级表meters做模板自动创建，同时打上标签值“Beijing.Chaoyang", 2。  
+
+关于自动建表的详细语法请参见 [插入记录时自动建表](https://www.taosdata.com/cn/documentation/taos-sql#auto_create_table) 章节。
 
 ## 多列模型 vs 单列模型
 

documentation20/cn/12.taos-sql/docs.md

@@ -152,6 +152,14 @@ TDengine缺省的时间戳是毫秒精度，但通过修改配置参数enableMic
     ```
     以指定的超级表为模板，指定 tags 的值来创建数据表。
 
+- **以超级表为模板创建数据表，并指定具体的 tags 列**
+
+    ```mysql
+    CREATE TABLE [IF NOT EXISTS] tb_name USING stb_name (tag_name1, ...) TAGS (tag_value1, ...);
+    ```
+    以指定的超级表为模板，指定一部分 tags 列的值来创建数据表。（没被指定的 tags 列会设为空值。）  
+    说明：从 2.0.17 版本开始支持这种方式。在之前的版本中，不允许指定 tags 列，而必须显式给出所有 tags 列的取值。
+
 - **批量创建数据表**
 
     ```mysql
@@ -306,7 +314,7 @@ TDengine缺省的时间戳是毫秒精度，但通过修改配置参数enableMic
 
 - **插入一条记录，数据对应到指定的列**
     ```mysql
-    INSERT INTO tb_name (field1_name, ...) VALUES (field1_value, ...)
+    INSERT INTO tb_name (field1_name, ...) VALUES (field1_value1, ...);
     ```
     向表tb_name中插入一条记录，数据对应到指定的列。SQL语句中没有出现的列，数据库将自动填充为NULL。主键（时间戳）不能为NULL。
 
@@ -340,6 +348,18 @@ TDengine缺省的时间戳是毫秒精度，但通过修改配置参数enableMic
     1) 如果时间戳为0，系统将自动使用服务器当前时间作为该记录的时间戳；
     2) 允许插入的最老记录的时间戳，是相对于当前服务器时间，减去配置的keep值（数据保留的天数），允许插入的最新记录的时间戳，是相对于当前服务器时间，加上配置的days值（数据文件存储数据的时间跨度，单位为天）。keep和days都是可以在创建数据库时指定的，缺省值分别是3650天和10天。
 
+- <a class="anchor" id="auto_create_table"></a>**插入记录时自动建表**
+    ```mysql
+    INSERT INTO tb_name USING stb_name TAGS (tag_value1, ...) VALUES (field_value1, ...);
+    ```
+    如果用户在写数据时并不确定某个表是否存在，此时可以在写入数据时使用自动建表语法来创建不存在的表，若该表已存在则不会建立新表。自动建表时，要求必须以超级表为模板，并写明数据表的 tags 取值。
+
+- **插入记录时自动建表，并指定具体的 tags 列**
+    ```mysql
+    INSERT INTO tb_name USING stb_name (tag_name1, ...) TAGS (tag_value1, ...) VALUES (field_value1, ...);
+    ```
+    在自动建表时，可以只是指定部分 tags 列的取值，未被指定的 tags 列将取为空值。
+
 **历史记录写入**：可使用IMPORT或者INSERT命令，IMPORT的语法，功能与INSERT完全一样。
 
 说明：针对 insert 类型的 SQL 语句，我们采用的流式解析策略，在发现后面的错误之前，前面正确的部分SQL仍会执行。下面的sql中，insert语句是无效的，但是d1001仍会被创建。
@@ -383,7 +403,7 @@ SELECT select_expr [, select_expr ...]
     [ORDER BY col_list { DESC | ASC }]
     [SLIMIT limit_val [, SOFFSET offset_val]]
     [LIMIT limit_val [, OFFSET offset_val]]
-    [>> export_file]
+    [>> export_file];
 ```
 
 #### SELECT子句

src/connector/jdbc/pom.xml

@@ -128,6 +128,7 @@
                     </includes>
                     <excludes>
                         <exclude>**/AppMemoryLeakTest.java</exclude>
+                        <exclude>**/AuthenticationTest.java</exclude>
                         <exclude>**/TaosInfoMonitorTest.java</exclude>
                         <exclude>**/FailOverTest.java</exclude>
                         <exclude>**/InvalidResultSetPointerTest.java</exclude>

src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractConnection.java

+package com.taosdata.jdbc;
+
+import java.sql.*;
+import java.util.Enumeration;
+import java.util.Map;
+import java.util.Properties;
+import java.util.concurrent.*;
+
+public abstract class AbstractConnection extends WrapperImpl implements Connection {
+
+    protected volatile boolean isClosed;
+    protected volatile String catalog;
+    protected volatile Properties clientInfoProps = new Properties();
+
+    @Override
+    public abstract Statement createStatement() throws SQLException;
+
+    @Override
+    public abstract PreparedStatement prepareStatement(String sql) throws SQLException;
+
+    @Override
+    public CallableStatement prepareCall(String sql) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public String nativeSQL(String sql) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+        // do nothing
+        return sql;
+    }
+
+    @Override
+    public void setAutoCommit(boolean autoCommit) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        //do nothing
+    }
+
+    @Override
+    public boolean getAutoCommit() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        return true;
+    }
+
+    @Override
+    public void commit() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        // do nothing
+    }
+
+    @Override
+    public void rollback() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        // do nothing
+    }
+
+    @Override
+    public abstract void close() throws SQLException;
+
+    @Override
+    public abstract boolean isClosed() throws SQLException;
+
+    @Override
+    public abstract DatabaseMetaData getMetaData() throws SQLException;
+
+    @Override
+    public void setReadOnly(boolean readOnly) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        //do nothing
+    }
+
+    @Override
+    public boolean isReadOnly() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+        return true;
+    }
+
+    @Override
+    public void setCatalog(String catalog) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+        /*
+        try (Statement stmt = createStatement()) {
+            boolean execute = stmt.execute("use " + catalog);
+            if (execute)
+                this.catalog = catalog;
+        } catch (SQLException e) {
+            // do nothing
+        }
+        */
+
+        this.catalog = catalog;
+    }
+
+    @Override
+    public String getCatalog() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        return this.catalog;
+    }
+
+    @Override
+    public void setTransactionIsolation(int level) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        switch (level) {
+            case Connection.TRANSACTION_NONE:
+                break;
+            case Connection.TRANSACTION_READ_UNCOMMITTED:
+            case Connection.TRANSACTION_READ_COMMITTED:
+            case Connection.TRANSACTION_REPEATABLE_READ:
+            case Connection.TRANSACTION_SERIALIZABLE:
+                throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
+            default:
+                throw new SQLException(TSDBConstants.INVALID_VARIABLES);
+        }
+        //do nothing
+    }
+
+    @Override
+    public int getTransactionIsolation() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        return Connection.TRANSACTION_NONE;
+    }
+
+    @Override
+    public SQLWarning getWarnings() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        return null;
+    }
+
+    @Override
+    public void clearWarnings() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        // do nothing
+    }
+
+    @Override
+    public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        switch (resultSetType) {
+            case ResultSet.TYPE_FORWARD_ONLY:
+                break;
+            case ResultSet.TYPE_SCROLL_INSENSITIVE:
+            case ResultSet.TYPE_SCROLL_SENSITIVE:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+            default:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
+        }
+
+        switch (resultSetConcurrency) {
+            case ResultSet.CONCUR_READ_ONLY:
+                break;
+            case ResultSet.CONCUR_UPDATABLE:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+            default:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
+        }
+
+        return createStatement();
+    }
+
+    @Override
+    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        switch (resultSetType) {
+            case ResultSet.TYPE_FORWARD_ONLY:
+                break;
+            case ResultSet.TYPE_SCROLL_INSENSITIVE:
+            case ResultSet.TYPE_SCROLL_SENSITIVE:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+            default:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
+        }
+
+        switch (resultSetConcurrency) {
+            case ResultSet.CONCUR_READ_ONLY:
+                break;
+            case ResultSet.CONCUR_UPDATABLE:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+            default:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
+        }
+        return prepareStatement(sql);
+    }
+
+    @Override
+    public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public Map<String, Class<?>> getTypeMap() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public void setHoldability(int holdability) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        switch (holdability) {
+            case ResultSet.HOLD_CURSORS_OVER_COMMIT:
+                break;
+            case ResultSet.CLOSE_CURSORS_AT_COMMIT:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+            default:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
+        }
+        //do nothing
+    }
+
+    @Override
+    public int getHoldability() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        return ResultSet.HOLD_CURSORS_OVER_COMMIT;
+    }
+
+    @Override
+    public Savepoint setSavepoint() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public Savepoint setSavepoint(String name) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public void rollback(Savepoint savepoint) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public void releaseSavepoint(Savepoint savepoint) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        switch (resultSetHoldability) {
+            case ResultSet.HOLD_CURSORS_OVER_COMMIT:
+                break;
+            case ResultSet.CLOSE_CURSORS_AT_COMMIT:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+            default:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
+        }
+
+        return createStatement(resultSetType, resultSetConcurrency);
+    }
+
+    @Override
+    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)
+            throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        switch (resultSetHoldability) {
+            case ResultSet.HOLD_CURSORS_OVER_COMMIT:
+                break;
+            case ResultSet.CLOSE_CURSORS_AT_COMMIT:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+            default:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
+        }
+        return prepareStatement(sql, resultSetType, resultSetConcurrency);
+    }
+
+    @Override
+    public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        switch (autoGeneratedKeys) {
+            case Statement.RETURN_GENERATED_KEYS:
+                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+            case Statement.NO_GENERATED_KEYS:
+                break;
+        }
+        return prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    }
+
+    @Override
+    public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public Clob createClob() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public Blob createBlob() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public NClob createNClob() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public SQLXML createSQLXML() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public boolean isValid(int timeout) throws SQLException {
+        //true if the connection is valid, false otherwise
+        if (isClosed())
+            return false;
+        if (timeout < 0)    //SQLException - if the value supplied for timeout is less then 0
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
+
+        ExecutorService executor = Executors.newCachedThreadPool();
+        Future<Boolean> future = executor.submit(() -> {
+            int status;
+            try (Statement stmt = createStatement()) {
+                ResultSet resultSet = stmt.executeQuery("select server_status()");
+                resultSet.next();
+                status = resultSet.getInt("server_status()");
+                resultSet.close();
+            }
+            return status == 1 ? true : false;
+        });
+
+        boolean status = false;
+        try {
+            if (timeout == 0)
+                status = future.get();
+            else
+                status = future.get(timeout, TimeUnit.SECONDS);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        } catch (ExecutionException e) {
+            e.printStackTrace();
+        } catch (TimeoutException e) {
+            future.cancel(true);
+            status = false;
+        } finally {
+            executor.shutdownNow();
+        }
+        return status;
+    }
+
+    @Override
+    public void setClientInfo(String name, String value) throws SQLClientInfoException {
+        if (isClosed)
+            throw TSDBError.createSQLClientInfoException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        if (clientInfoProps == null)
+            clientInfoProps = new Properties();
+        clientInfoProps.setProperty(name, value);
+    }
+
+    @Override
+    public void setClientInfo(Properties properties) throws SQLClientInfoException {
+        if (isClosed)
+            throw TSDBError.createSQLClientInfoException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        for (Enumeration<Object> enumer = properties.keys(); enumer.hasMoreElements(); ) {
+            String name = (String) enumer.nextElement();
+            clientInfoProps.put(name, properties.getProperty(name));
+        }
+    }
+
+    @Override
+    public String getClientInfo(String name) throws SQLException {
+        if (isClosed)
+            throw TSDBError.createSQLClientInfoException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        return clientInfoProps.getProperty(name);
+    }
+
+    @Override
+    public Properties getClientInfo() throws SQLException {
+        if (isClosed)
+            throw TSDBError.createSQLClientInfoException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        return clientInfoProps;
+    }
+
+    @Override
+    public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public void setSchema(String schema) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+        //do nothing
+    }
+
+    @Override
+    public String getSchema() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        return null;
+    }
+
+    @Override
+    public void abort(Executor executor) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        // do nothing
+    }
+
+    @Override
+    public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+        if (milliseconds < 0)
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+
+    @Override
+    public int getNetworkTimeout() throws SQLException {
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
+
+        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+    }
+}

src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDatabaseMetaData.java

@@ -4,7 +4,7 @@ import java.sql.*;
 import java.util.ArrayList;
 import java.util.List;
 
-public abstract class AbstractDatabaseMetaData implements DatabaseMetaData, Wrapper {
+public abstract class AbstractDatabaseMetaData extends WrapperImpl implements DatabaseMetaData {
 
     private final static String PRODUCT_NAME = "TDengine";
     private final static String PRODUCT_VESION = "2.0.x.x";
@@ -981,9 +981,7 @@ public abstract class AbstractDatabaseMetaData implements DatabaseMetaData, Wrap
         return getEmptyResultSet();
     }
 
-    public Connection getConnection() throws SQLException {
-        return null;
-    }
+    public abstract Connection getConnection() throws SQLException;
 
     public boolean supportsSavepoints() throws SQLException {
         return false;
@@ -1067,6 +1065,7 @@ public abstract class AbstractDatabaseMetaData implements DatabaseMetaData, Wrap
     }
 
     public ResultSet getClientInfoProperties() throws SQLException {
+        //TODO: see https://docs.oracle.com/javase/8/docs/api/java/sql/Connection.html#setClientInfo-java.lang.String-java.lang.String-
         return getEmptyResultSet();
     }
 
@@ -1093,20 +1092,6 @@ public abstract class AbstractDatabaseMetaData implements DatabaseMetaData, Wrap
         return new EmptyResultSet();
     }
 
-    @Override
-    public <T> T unwrap(Class<T> iface) throws SQLException {
-        try {
-            return iface.cast(this);
-        } catch (ClassCastException cce) {
-            throw new SQLException("Unable to unwrap to " + iface.toString());
-        }
-    }
-
-    @Override
-    public boolean isWrapperFor(Class<?> iface) throws SQLException {
-        return iface.isInstance(this);
-    }
-
     protected ResultSet getCatalogs(Connection conn) throws SQLException {
         try (Statement stmt = conn.createStatement()) {
             DatabaseMetaDataResultSet resultSet = new DatabaseMetaDataResultSet();

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConnection.java

@@ -14,41 +14,25 @@
  *****************************************************************************/
 package com.taosdata.jdbc;
 
-import java.sql.Array;
-import java.sql.Blob;
-import java.sql.CallableStatement;
-import java.sql.Clob;
-import java.sql.Connection;
-import java.sql.DatabaseMetaData;
-import java.sql.NClob;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLClientInfoException;
-import java.sql.SQLException;
-import java.sql.SQLWarning;
-import java.sql.SQLXML;
-import java.sql.Savepoint;
-import java.sql.Statement;
-import java.sql.Struct;
-import java.util.*;
-import java.util.concurrent.Executor;
+import java.sql.*;
+import java.util.Properties;
 
-public class TSDBConnection implements Connection {
+public class TSDBConnection extends AbstractConnection {
 
-    private TSDBJNIConnector connector = null;
+    private TSDBJNIConnector connector;
+    private TSDBDatabaseMetaData databaseMetaData;
+    private boolean batchFetch;
 
-    private String catalog = null;
-
-    private TSDBDatabaseMetaData dbMetaData;
-
-    private Properties clientInfoProps = new Properties();
-
-    private int timeoutMilliseconds = 0;
+    public Boolean getBatchFetch() {
+        return this.batchFetch;
+    }
 
-    private boolean batchFetch = false;
+    public void setBatchFetch(Boolean batchFetch) {
+        this.batchFetch = batchFetch;
+    }
 
     public TSDBConnection(Properties info, TSDBDatabaseMetaData meta) throws SQLException {
-        this.dbMetaData = meta;
+        this.databaseMetaData = meta;
         connect(info.getProperty(TSDBDriver.PROPERTY_KEY_HOST),
                 Integer.parseInt(info.getProperty(TSDBDriver.PROPERTY_KEY_PORT, "0")),
                 info.getProperty(TSDBDriver.PROPERTY_KEY_DBNAME),
@@ -64,8 +48,8 @@ public class TSDBConnection implements Connection {
     private void connect(String host, int port, String dbName, String user, String password) throws SQLException {
         this.connector = new TSDBJNIConnector();
         this.connector.connect(host, port, dbName, user, password);
-        this.setCatalog(dbName);
-        this.dbMetaData.setConnection(this);
+        this.catalog = dbName;
+        this.databaseMetaData.setConnection(this);
     }
 
     public TSDBJNIConnector getConnection() {
@@ -102,52 +86,11 @@ public class TSDBConnection implements Connection {
         return new TSDBPreparedStatement(this, this.connector, sql);
     }
 
-    public CallableStatement prepareCall(String sql) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public String nativeSQL(String sql) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public void setAutoCommit(boolean autoCommit) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-
-    }
-
-    public boolean getAutoCommit() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-
-        return true;
-    }
-
-    public void commit() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-    }
-
-    public void rollback() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
     public void close() throws SQLException {
         if (isClosed()) {
             throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         }
+        this.isClosed = true;
         this.connector.closeConnection();
     }
 
@@ -155,105 +98,11 @@ public class TSDBConnection implements Connection {
         return this.connector != null && this.connector.isClosed();
     }
 
-    /**
-     * A connection's database is able to provide information describing its tables,
-     * its supported SQL grammar, its stored procedures, the capabilities of this
-     * connection, etc. This information is made available through a
-     * DatabaseMetaData object.
-     *
-     * @return a DatabaseMetaData object for this connection
-     * @throws SQLException if a database access error occurs
-     */
     public DatabaseMetaData getMetaData() throws SQLException {
         if (isClosed()) {
             throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         }
-        return this.dbMetaData;
-    }
-
-    /**
-     * This readOnly option is not supported by TDengine. However, the method is intentionally left blank here to
-     * support HikariCP connection.
-     *
-     * @param readOnly
-     * @throws SQLException
-     */
-    public void setReadOnly(boolean readOnly) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-    }
-
-    public boolean isReadOnly() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        return true;
-    }
-
-    public void setCatalog(String catalog) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        this.catalog = catalog;
-    }
-
-    public String getCatalog() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        return this.catalog;
-    }
-
-    /**
-     * The transaction isolation level option is not supported by TDengine.
-     * This method is intentionally left empty to support HikariCP connection.
-     *
-     * @param level
-     * @throws SQLException
-     */
-    public void setTransactionIsolation(int level) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        switch (level) {
-            case Connection.TRANSACTION_NONE:
-            case Connection.TRANSACTION_READ_COMMITTED:
-            case Connection.TRANSACTION_READ_UNCOMMITTED:
-            case Connection.TRANSACTION_REPEATABLE_READ:
-            case Connection.TRANSACTION_SERIALIZABLE:
-                break;
-            default:
-                throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
-        }
-    }
-
-    /**
-     * The transaction isolation level option is not supported by TDengine.
-     *
-     * @return
-     * @throws SQLException
-     */
-    public int getTransactionIsolation() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        return Connection.TRANSACTION_NONE;
-    }
-
-    public SQLWarning getWarnings() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        //todo: implement getWarnings according to the warning messages returned from TDengine
-        return null;
-    }
-
-    public void clearWarnings() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        //todo: implement clearWarnings according to the warning messages returned from TDengine
+        return this.databaseMetaData;
     }
 
     public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
@@ -263,253 +112,4 @@ public class TSDBConnection implements Connection {
         throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
     }
 
-    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
-            throws SQLException {
-        // This method is implemented in the current way to support Spark
-        if (resultSetType != ResultSet.TYPE_FORWARD_ONLY) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
-        }
-
-        if (resultSetConcurrency != ResultSet.CONCUR_READ_ONLY) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
-        }
-
-        return this.prepareStatement(sql);
-    }
-
-    public Boolean getBatchFetch() {
-        return this.batchFetch;
-    }
-
-    public void setBatchFetch(Boolean batchFetch) {
-        this.batchFetch = batchFetch;
-    }
-
-    public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public Map<String, Class<?>> getTypeMap() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public void setHoldability(int holdability) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-    }
-
-    /**
-     * the transaction is not supported by TDengine, so the opened ResultSet Objects will remain open
-     *
-     * @return
-     * @throws SQLException
-     */
-    public int getHoldability() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        return ResultSet.HOLD_CURSORS_OVER_COMMIT;
-    }
-
-    public Savepoint setSavepoint() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public Savepoint setSavepoint(String name) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public void rollback(Savepoint savepoint) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public void releaseSavepoint(Savepoint savepoint) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)
-            throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency,
-                                              int resultSetHoldability) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency,
-                                         int resultSetHoldability) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public Clob createClob() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public Blob createBlob() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public NClob createNClob() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public SQLXML createSQLXML() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public boolean isValid(int timeout) throws SQLException {
-        return !this.isClosed();
-    }
-
-    public void setClientInfo(String name, String value) throws SQLClientInfoException {
-        clientInfoProps.setProperty(name, value);
-    }
-
-    public void setClientInfo(Properties properties) throws SQLClientInfoException {
-        for (Enumeration<Object> enumer = properties.keys(); enumer.hasMoreElements(); ) {
-            String name = (String) enumer.nextElement();
-            clientInfoProps.put(name, properties.getProperty(name));
-        }
-    }
-
-    public String getClientInfo(String name) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        return clientInfoProps.getProperty(name);
-    }
-
-    public Properties getClientInfo() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        return clientInfoProps;
-    }
-
-    public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public void setSchema(String schema) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public String getSchema() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public void abort(Executor executor) throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
-    }
-
-    public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
-        this.timeoutMilliseconds = milliseconds;
-    }
-
-    public int getNetworkTimeout() throws SQLException {
-        if (isClosed()) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-        }
-        return this.timeoutMilliseconds;
-    }
-
-    public <T> T unwrap(Class<T> iface) throws SQLException {
-        try {
-            return iface.cast(this);
-        } catch (ClassCastException cce) {
-            throw new SQLException("Unable to unwrap to " + iface.toString());
-        }
-    }
-
-    public boolean isWrapperFor(Class<?> iface) throws SQLException {
-        return iface.isInstance(this);
-    }
 }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDatabaseMetaData.java

@@ -57,39 +57,38 @@ public class TSDBDatabaseMetaData extends AbstractDatabaseMetaData {
      */
     public ResultSet getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types) throws SQLException {
         if (conn == null || conn.isClosed()) {
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         }
         return super.getTables(catalog, schemaPattern, tableNamePattern, types, conn);
     }
 
-
     public ResultSet getCatalogs() throws SQLException {
         if (conn == null || conn.isClosed())
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         return super.getCatalogs(conn);
     }
 
     public ResultSet getTableTypes() throws SQLException {
         if (conn == null || conn.isClosed())
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         return super.getTableTypes();
     }
 
     public ResultSet getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) throws SQLException {
         if (conn == null || conn.isClosed())
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         return super.getColumns(catalog, schemaPattern, tableNamePattern, columnNamePattern, conn);
     }
 
     public ResultSet getPrimaryKeys(String catalog, String schema, String table) throws SQLException {
         if (conn == null || conn.isClosed())
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         return super.getPrimaryKeys(catalog, schema, table, conn);
     }
 
     public ResultSet getSuperTables(String catalog, String schemaPattern, String tableNamePattern) throws SQLException {
         if (conn == null || conn.isClosed())
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         return super.getSuperTables(catalog, schemaPattern, tableNamePattern, conn);
     }
 

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBError.java

 package com.taosdata.jdbc;
 
+import java.sql.SQLClientInfoException;
 import java.sql.SQLException;
 import java.sql.SQLFeatureNotSupportedException;
 import java.util.HashMap;
@@ -17,6 +18,10 @@ public class TSDBError {
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_BATCH_IS_EMPTY, "Batch is empty!");
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_INVALID_WITH_EXECUTEQUERY, "Can not issue data manipulation statements with executeQuery()");
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_INVALID_WITH_EXECUTEUPDATE, "Can not issue SELECT via executeUpdate()");
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE_QUERY, "not a valid sql for executeQuery: (?)");
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_DATABASE_NOT_SPECIFIED_OR_AVAILABLE, "Database not specified or available");
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE_UPDATE, "not a valid sql for executeUpdate: (?)");
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE, "not a valid sql for execute: (?)");
 
         /**************************************************/
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_UNKNOWN, "unknown error");
@@ -58,4 +63,8 @@ public class TSDBError {
         // JNI exception's error number is large than 0x2350
         return new SQLException("TDengine ERROR (" + Integer.toHexString(errorNumber) + "): " + message);
     }
+
+    public static SQLClientInfoException createSQLClientInfoException(int errorNumber) {
+        return new SQLClientInfoException();
+    }
 }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java

@@ -12,6 +12,10 @@ public class TSDBErrorNumbers {
     public static final int ERROR_BATCH_IS_EMPTY = 0x2306;      //Batch is empty!
     public static final int ERROR_INVALID_WITH_EXECUTEQUERY = 0x2307;  //Can not issue data manipulation statements with executeQuery()
     public static final int ERROR_INVALID_WITH_EXECUTEUPDATE = 0x2308; //Can not issue SELECT via executeUpdate()
+    public static final int ERROR_INVALID_FOR_EXECUTE_QUERY = 0x2309;  //not a valid sql for executeQuery: (SQL)
+    public static final int ERROR_DATABASE_NOT_SPECIFIED_OR_AVAILABLE = 0x2310; //Database not specified or available
+    public static final int ERROR_INVALID_FOR_EXECUTE_UPDATE = 0x2311;  //not a valid sql for executeUpdate: (SQL)
+    public static final int ERROR_INVALID_FOR_EXECUTE = 0x2312;         //not a valid sql for execute: (SQL)
 
     public static final int ERROR_UNKNOWN = 0x2350;    //unknown error
 
@@ -37,6 +41,11 @@ public class TSDBErrorNumbers {
         errorNumbers.add(ERROR_RESULTSET_CLOSED);
         errorNumbers.add(ERROR_INVALID_WITH_EXECUTEQUERY);
         errorNumbers.add(ERROR_INVALID_WITH_EXECUTEUPDATE);
+        errorNumbers.add(ERROR_INVALID_FOR_EXECUTE_QUERY);
+        errorNumbers.add(ERROR_DATABASE_NOT_SPECIFIED_OR_AVAILABLE);
+        errorNumbers.add(ERROR_INVALID_FOR_EXECUTE_UPDATE);
+        errorNumbers.add(ERROR_INVALID_FOR_EXECUTE);
+
         /*****************************************************/
         errorNumbers.add(ERROR_SUBSCRIBE_FAILED);
         errorNumbers.add(ERROR_UNSUPPORTED_ENCODING);

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBSubscribe.java

@@ -16,9 +16,6 @@ package com.taosdata.jdbc;
 
 import javax.management.OperationsException;
 import java.sql.SQLException;
-import java.util.Map;
-import java.util.TimerTask;
-import java.util.concurrent.*;
 
 public class TSDBSubscribe {
     private TSDBJNIConnector connecter = null;
@@ -36,9 +33,8 @@ public class TSDBSubscribe {
     /**
      * consume
      *
-     * @throws OperationsException, SQLException
      */
-    public TSDBResultSet consume() throws OperationsException, SQLException {
+    public TSDBResultSet consume() throws SQLException {
         if (this.connecter.isClosed()) {
             throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
         }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulConnection.java

 package com.taosdata.jdbc.rs;
 
-import com.taosdata.jdbc.TSDBConstants;
-import com.taosdata.jdbc.TSDBDriver;
+import com.taosdata.jdbc.*;
 
 import java.sql.*;
-import java.util.Enumeration;
-import java.util.HashMap;
-import java.util.Map;
 import java.util.Properties;
-import java.util.concurrent.Executor;
 
-public class RestfulConnection implements Connection {
+public class RestfulConnection extends AbstractConnection {
 
-    private static final String CONNECTION_IS_CLOSED = "connection is closed.";
-    private static final String AUTO_COMMIT_IS_TRUE = "auto commit is true";
     private final String host;
     private final int port;
-    private final Properties props;
-    private volatile String database;
     private final String url;
+    private volatile String database;
     /******************************************************/
     private boolean isClosed;
-    private DatabaseMetaData metadata;
-    private Map<String, Class<?>> typeMap;
-    private Properties clientInfoProps = new Properties();
+    private final DatabaseMetaData metadata;
 
     public RestfulConnection(String host, String port, Properties props, String database, String url) {
         this.host = host;
         this.port = Integer.parseInt(port);
-        this.props = props;
         this.database = database;
         this.url = url;
         this.metadata = new RestfulDatabaseMetaData(url, props.getProperty(TSDBDriver.PROPERTY_KEY_USER), this);
@@ -37,7 +26,7 @@ public class RestfulConnection implements Connection {
     @Override
     public Statement createStatement() throws SQLException {
         if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);;
 
         return new RestfulStatement(this, database);
     }
@@ -45,61 +34,11 @@ public class RestfulConnection implements Connection {
     @Override
     public PreparedStatement prepareStatement(String sql) throws SQLException {
         if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);;
         //TODO: prepareStatement
         throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
     }
 
-    @Override
-    public CallableStatement prepareCall(String sql) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public String nativeSQL(String sql) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-
-        //nothing did
-        return sql;
-    }
-
-    @Override
-    public void setAutoCommit(boolean autoCommit) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        if (!autoCommit)
-            throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public boolean getAutoCommit() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        return true;
-    }
-
-    @Override
-    public void commit() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        if (getAutoCommit())
-            throw new SQLException(AUTO_COMMIT_IS_TRUE);
-        //nothing to do
-    }
-
-    @Override
-    public void rollback() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        if (getAutoCommit())
-            throw new SQLException(AUTO_COMMIT_IS_TRUE);
-        //nothing to do
-    }
-
     @Override
     public void close() throws SQLException {
         if (isClosed)
@@ -116,356 +55,11 @@ public class RestfulConnection implements Connection {
     @Override
     public DatabaseMetaData getMetaData() throws SQLException {
         if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);;
 
         return this.metadata;
     }
 
-    @Override
-    public void setReadOnly(boolean readOnly) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        // nothing to do
-    }
-
-    @Override
-    public boolean isReadOnly() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        return true;
-    }
-
-    @Override
-    public void setCatalog(String catalog) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        synchronized (RestfulConnection.class) {
-            this.database = catalog;
-        }
-    }
-
-    @Override
-    public String getCatalog() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        return this.database;
-    }
-
-    @Override
-    public void setTransactionIsolation(int level) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        switch (level) {
-            case Connection.TRANSACTION_NONE:
-                break;
-            case Connection.TRANSACTION_READ_UNCOMMITTED:
-            case Connection.TRANSACTION_READ_COMMITTED:
-            case Connection.TRANSACTION_REPEATABLE_READ:
-            case Connection.TRANSACTION_SERIALIZABLE:
-                throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-            default:
-                throw new SQLException(TSDBConstants.INVALID_VARIABLES);
-        }
-    }
-
-    @Override
-    public int getTransactionIsolation() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        //Connection.TRANSACTION_NONE specifies that transactions are not supported.
-        return Connection.TRANSACTION_NONE;
-    }
-
-    @Override
-    public SQLWarning getWarnings() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-
-        return null;
-    }
-
-    @Override
-    public void clearWarnings() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        //nothing to do
-    }
-
-    @Override
-    public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-
-        if (resultSetType != ResultSet.TYPE_FORWARD_ONLY) {
-            throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-        }
-        if (resultSetConcurrency != ResultSet.CONCUR_READ_ONLY)
-            throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-        return createStatement();
-    }
-
-    @Override
-    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        if (resultSetType != ResultSet.TYPE_FORWARD_ONLY || resultSetConcurrency != ResultSet.CONCUR_READ_ONLY)
-            throw new SQLFeatureNotSupportedException(TSDBConstants.INVALID_VARIABLES);
-
-        return this.prepareStatement(sql);
-    }
-
-    @Override
-    public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        if (resultSetType != ResultSet.TYPE_FORWARD_ONLY || resultSetConcurrency != ResultSet.CONCUR_READ_ONLY)
-            throw new SQLFeatureNotSupportedException(TSDBConstants.INVALID_VARIABLES);
-
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public Map<String, Class<?>> getTypeMap() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-
-        synchronized (RestfulConnection.class) {
-            if (this.typeMap == null) {
-                this.typeMap = new HashMap<>();
-            }
-            return this.typeMap;
-        }
-    }
-
-    @Override
-    public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-
-        synchronized (RestfulConnection.class) {
-            this.typeMap = map;
-        }
-    }
-
-    @Override
-    public void setHoldability(int holdability) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        if (holdability != ResultSet.HOLD_CURSORS_OVER_COMMIT)
-            throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public int getHoldability() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        return ResultSet.HOLD_CURSORS_OVER_COMMIT;
-    }
-
-    @Override
-    public Savepoint setSavepoint() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        if (getAutoCommit())
-            throw new SQLException(TSDBConstants.INVALID_VARIABLES);
-        //nothing to do
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public Savepoint setSavepoint(String name) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        if (getAutoCommit())
-            throw new SQLException(TSDBConstants.INVALID_VARIABLES);
-        //nothing to do
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public void rollback(Savepoint savepoint) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        if (getAutoCommit())
-            throw new SQLException(TSDBConstants.INVALID_VARIABLES);
-        //nothing to do
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public void releaseSavepoint(Savepoint savepoint) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
-        if (resultSetHoldability != ResultSet.HOLD_CURSORS_OVER_COMMIT)
-            throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-        return createStatement(resultSetType, resultSetConcurrency);
-    }
-
-    @Override
-    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
-        if (resultSetHoldability != ResultSet.HOLD_CURSORS_OVER_COMMIT)
-            throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-        return prepareStatement(sql, resultSetType, resultSetConcurrency);
-    }
-
-    @Override
-    public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public Clob createClob() throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public Blob createBlob() throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public NClob createNClob() throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public SQLXML createSQLXML() throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public boolean isValid(int timeout) throws SQLException {
-        if (timeout < 0)
-            throw new SQLException(TSDBConstants.INVALID_VARIABLES);
-        // TODO:
-        /* The driver shall submit a query on the connection or use some other mechanism that positively verifies
-         the connection is still valid when this method is called.*/
-        return !isClosed();
-    }
-
-    @Override
-    public void setClientInfo(String name, String value) throws SQLClientInfoException {
-        if (isClosed)
-            throw new SQLClientInfoException();
-        clientInfoProps.setProperty(name, value);
-    }
-
-    @Override
-    public void setClientInfo(Properties properties) throws SQLClientInfoException {
-        if (isClosed)
-            throw new SQLClientInfoException();
-
-        for (Enumeration<Object> enumer = properties.keys(); enumer.hasMoreElements(); ) {
-            String name = (String) enumer.nextElement();
-            clientInfoProps.put(name, properties.getProperty(name));
-        }
-    }
-
-    @Override
-    public String getClientInfo(String name) throws SQLException {
-        if (isClosed)
-            throw new SQLClientInfoException();
-
-        return clientInfoProps.getProperty(name);
-    }
-
-    @Override
-    public Properties getClientInfo() throws SQLException {
-        if (isClosed)
-            throw new SQLClientInfoException();
-
-        return clientInfoProps;
-    }
-
-    @Override
-    public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public void setSchema(String schema) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        synchronized (RestfulConnection.class) {
-            this.database = schema;
-        }
-    }
-
-    @Override
-    public String getSchema() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        return this.database;
-    }
-
-    @Override
-    public void abort(Executor executor) throws SQLException {
-        if (executor == null) {
-            throw new SQLException("Executor can not be null");
-        }
-
-        executor.execute(() -> {
-            try {
-                close();
-            } catch (SQLException e) {
-                e.printStackTrace();
-            }
-        });
-    }
-
-    @Override
-    public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        throw new SQLFeatureNotSupportedException(TSDBConstants.UNSUPPORTED_METHOD_EXCEPTION_MSG);
-    }
-
-    @Override
-    public int getNetworkTimeout() throws SQLException {
-        if (isClosed())
-            throw new SQLException(CONNECTION_IS_CLOSED);
-        return 0;
-    }
-
-    @Override
-    public <T> T unwrap(Class<T> iface) throws SQLException {
-        try {
-            return iface.cast(this);
-        } catch (ClassCastException cce) {
-            throw new SQLException("Unable to unwrap to " + iface.toString());
-        }
-    }
-
-    @Override
-    public boolean isWrapperFor(Class<?> iface) throws SQLException {
-        return iface.isInstance(this);
-    }
-
     public String getHost() {
         return host;
     }
@@ -474,10 +68,6 @@ public class RestfulConnection implements Connection {
         return port;
     }
 
-    public Properties getProps() {
-        return props;
-    }
-
     public String getDatabase() {
         return database;
     }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulDatabaseMetaData.java

 package com.taosdata.jdbc.rs;
 
-import com.taosdata.jdbc.*;
+import com.taosdata.jdbc.AbstractDatabaseMetaData;
+import com.taosdata.jdbc.TSDBError;
+import com.taosdata.jdbc.TSDBErrorNumbers;
 
-import java.sql.*;
-import java.util.ArrayList;
-import java.util.List;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
 
 public class RestfulDatabaseMetaData extends AbstractDatabaseMetaData {
 
@@ -33,11 +35,10 @@ public class RestfulDatabaseMetaData extends AbstractDatabaseMetaData {
         return RestfulDriver.class.getName();
     }
 
-
     @Override
     public ResultSet getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types) throws SQLException {
         if (connection == null || connection.isClosed()) {
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         }
         return super.getTables(catalog, schemaPattern, tableNamePattern, types, connection);
     }
@@ -45,14 +46,14 @@ public class RestfulDatabaseMetaData extends AbstractDatabaseMetaData {
     @Override
     public ResultSet getCatalogs() throws SQLException {
         if (connection == null || connection.isClosed())
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         return super.getCatalogs(connection);
     }
 
     @Override
     public ResultSet getTableTypes() throws SQLException {
         if (connection == null || connection.isClosed()) {
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         }
         return super.getTableTypes();
     }
@@ -60,21 +61,26 @@ public class RestfulDatabaseMetaData extends AbstractDatabaseMetaData {
     @Override
     public ResultSet getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) throws SQLException {
         if (connection == null || connection.isClosed())
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         return super.getColumns(catalog, schemaPattern, tableNamePattern, columnNamePattern, connection);
     }
 
     @Override
     public ResultSet getPrimaryKeys(String catalog, String schema, String table) throws SQLException {
         if (connection == null || connection.isClosed())
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         return super.getPrimaryKeys(catalog, schema, table, connection);
     }
 
+    @Override
+    public Connection getConnection() throws SQLException {
+        return this.connection;
+    }
+
     @Override
     public ResultSet getSuperTables(String catalog, String schemaPattern, String tableNamePattern) throws SQLException {
         if (connection == null || connection.isClosed())
-            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
         return super.getSuperTables(catalog, schemaPattern, tableNamePattern, connection);
     }
 

src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulStatement.java

@@ -4,6 +4,8 @@ import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.JSONObject;
 import com.taosdata.jdbc.AbstractStatement;
 import com.taosdata.jdbc.TSDBConstants;
+import com.taosdata.jdbc.TSDBError;
+import com.taosdata.jdbc.TSDBErrorNumbers;
 import com.taosdata.jdbc.rs.util.HttpClientPoolUtil;
 import com.taosdata.jdbc.utils.SqlSyntaxValidator;
 
@@ -63,9 +65,9 @@ public class RestfulStatement extends AbstractStatement {
     @Override
     public ResultSet executeQuery(String sql) throws SQLException {
         if (isClosed())
-            throw new SQLException("statement already closed");
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
         if (!SqlSyntaxValidator.isValidForExecuteQuery(sql))
-            throw new SQLException("not a valid sql for executeQuery: " + sql);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE_QUERY, "not a valid sql for executeQuery: " + sql);
 
         final String url = "http://" + conn.getHost() + ":" + conn.getPort() + "/rest/sql";
         if (SqlSyntaxValidator.isDatabaseUnspecifiedQuery(sql)) {
@@ -73,7 +75,7 @@ public class RestfulStatement extends AbstractStatement {
         }
 
         if (this.database == null || this.database.isEmpty())
-            throw new SQLException("Database not specified or available");
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_DATABASE_NOT_SPECIFIED_OR_AVAILABLE);
         HttpClientPoolUtil.execute(url, "use " + this.database);
         return executeOneQuery(url, sql);
     }
@@ -81,9 +83,9 @@ public class RestfulStatement extends AbstractStatement {
     @Override
     public int executeUpdate(String sql) throws SQLException {
         if (isClosed())
-            throw new SQLException("statement already closed");
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
         if (!SqlSyntaxValidator.isValidForExecuteUpdate(sql))
-            throw new SQLException("not a valid sql for executeUpdate: " + sql);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE_UPDATE, "not a valid sql for executeUpdate: " + sql);
 
         final String url = "http://" + conn.getHost() + ":" + conn.getPort() + "/rest/sql";
         if (SqlSyntaxValidator.isDatabaseUnspecifiedUpdate(sql)) {
@@ -91,7 +93,8 @@ public class RestfulStatement extends AbstractStatement {
         }
 
         if (this.database == null || this.database.isEmpty())
-            throw new SQLException("Database not specified or available");
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_DATABASE_NOT_SPECIFIED_OR_AVAILABLE);
+
         HttpClientPoolUtil.execute(url, "use " + this.database);
         return executeOneUpdate(url, sql);
     }
@@ -107,9 +110,9 @@ public class RestfulStatement extends AbstractStatement {
     @Override
     public boolean execute(String sql) throws SQLException {
         if (isClosed())
-            throw new SQLException("Invalid method call on a closed statement.");
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
         if (!SqlSyntaxValidator.isValidForExecute(sql))
-            throw new SQLException("not a valid sql for execute: " + sql);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE, "not a valid sql for execute: " + sql);
 
         //如果执行了use操作应该将当前Statement的catalog设置为新的database
         final String url = "http://" + conn.getHost() + ":" + conn.getPort() + "/rest/sql";
@@ -134,7 +137,7 @@ public class RestfulStatement extends AbstractStatement {
 
     private ResultSet executeOneQuery(String url, String sql) throws SQLException {
         if (!SqlSyntaxValidator.isValidForExecuteQuery(sql))
-            throw new SQLException("not a select sql for executeQuery: " + sql);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE_QUERY, "not a valid sql for executeQuery: " + sql);
 
         // row data
         String result = HttpClientPoolUtil.execute(url, sql);
@@ -165,7 +168,7 @@ public class RestfulStatement extends AbstractStatement {
 
     private int executeOneUpdate(String url, String sql) throws SQLException {
         if (!SqlSyntaxValidator.isValidForExecuteUpdate(sql))
-            throw new SQLException("not a valid sql for executeUpdate: " + sql);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE_UPDATE, "not a valid sql for executeUpdate: " + sql);
 
         String result = HttpClientPoolUtil.execute(url, sql);
         JSONObject jsonObject = JSON.parseObject(result);
@@ -186,16 +189,16 @@ public class RestfulStatement extends AbstractStatement {
 
     @Override
     public int getUpdateCount() throws SQLException {
-        if (isClosed()) {
-            throw new SQLException("Invalid method call on a closed statement.");
-        }
+        if (isClosed())
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
+
         return this.affectedRows;
     }
 
     @Override
     public void addBatch(String sql) throws SQLException {
         if (isClosed())
-            throw new SQLException(TSDBConstants.STATEMENT_CLOSED);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
         //TODO:
     }
 
@@ -213,7 +216,7 @@ public class RestfulStatement extends AbstractStatement {
     @Override
     public Connection getConnection() throws SQLException {
         if (isClosed())
-            throw new SQLException(TSDBConstants.STATEMENT_CLOSED);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
         return this.conn;
     }
 

src/connector/jdbc/src/test/java/com/taosdata/jdbc/ConnectionTest.java

-package com.taosdata.jdbc;
-
-import org.junit.Assert;
-import org.junit.Test;
-
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.Properties;
-
-
-public class ConnectionTest {
-    private Connection connection;
-    private Statement statement;
-    private static String host = "127.0.0.1";
-
-    @Test
-    public void testConnection() {
-        Properties properties = new Properties();
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
-
-        try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
-            connection = DriverManager.getConnection("jdbc:TAOS://" + host + ":0/", properties);
-            Assert.assertTrue(null != connection);
-            statement = connection.createStatement();
-            Assert.assertTrue(null != statement);
-            statement.close();
-            connection.close();
-        } catch (ClassNotFoundException e) {
-            return;
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-}

src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBConnectionTest.java

+package com.taosdata.jdbc;
+
+import org.junit.AfterClass;
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import javax.management.OperationsException;
+import java.sql.*;
+import java.util.Properties;
+
+public class TSDBConnectionTest {
+
+    private static final String host = "127.0.0.1";
+    private static Connection conn;
+
+    @Test
+    public void getConnection() {
+        // already test in beforeClass method
+    }
+
+    @Test
+    public void createStatement() {
+        try (Statement stmt = conn.createStatement()) {
+            ResultSet rs = stmt.executeQuery("select server_status()");
+            rs.next();
+            int status = rs.getInt("server_status()");
+            Assert.assertEquals(1, status);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void subscribe() {
+        try {
+            TSDBConnection unwrap = conn.unwrap(TSDBConnection.class);
+            TSDBSubscribe subscribe = unwrap.subscribe("topic1", "select * from log.log", false);
+            TSDBResultSet rs = subscribe.consume();
+            ResultSetMetaData metaData = rs.getMetaData();
+            for (int count = 0; count < 10 && rs.next(); count++) {
+                for (int i = 1; i <= metaData.getColumnCount(); i++) {
+                    String value = rs.getString(i);
+                    System.out.print(metaData.getColumnLabel(i) + ":" + value + "\t");
+                }
+                System.out.println();
+            }
+            Assert.assertNotNull(rs);
+            subscribe.close(false);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    @Test
+    public void prepareStatement() throws SQLException {
+        PreparedStatement pstmt = conn.prepareStatement("select server_status()");
+        ResultSet rs = pstmt.executeQuery();
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void prepareCall() throws SQLException {
+        conn.prepareCall("select server_status()");
+    }
+
+    @Test
+    public void nativeSQL() throws SQLException {
+        String nativeSQL = conn.nativeSQL("select * from log.log");
+        Assert.assertEquals("select * from log.log", nativeSQL);
+    }
+
+    @Test
+    public void setAutoCommit() throws SQLException {
+        conn.setAutoCommit(true);
+        conn.setAutoCommit(false);
+    }
+
+    @Test
+    public void getAutoCommit() throws SQLException {
+        Assert.assertTrue(conn.getAutoCommit());
+    }
+
+    @Test
+    public void commit() throws SQLException {
+        conn.commit();
+    }
+
+    @Test
+    public void rollback() throws SQLException {
+        conn.rollback();
+    }
+
+    @Test
+    public void close() {
+        // connection will close in afterClass method
+    }
+
+    @Test
+    public void isClosed() throws SQLException {
+        Assert.assertFalse(conn.isClosed());
+    }
+
+    @Test
+    public void getMetaData() throws SQLException {
+        DatabaseMetaData meta = conn.getMetaData();
+        Assert.assertNotNull(meta);
+        Assert.assertEquals("com.taosdata.jdbc.TSDBDriver", meta.getDriverName());
+    }
+
+    @Test
+    public void setReadOnly() throws SQLException {
+        conn.setReadOnly(true);
+    }
+
+    @Test
+    public void isReadOnly() throws SQLException {
+        Assert.assertTrue(conn.isReadOnly());
+    }
+
+    @Test
+    public void setCatalog() throws SQLException {
+        conn.setCatalog("test");
+        Assert.assertEquals("test", conn.getCatalog());
+    }
+
+    @Test
+    public void getCatalog() throws SQLException {
+        conn.setCatalog("log");
+        Assert.assertEquals("log", conn.getCatalog());
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setTransactionIsolation() throws SQLException {
+        conn.setTransactionIsolation(Connection.TRANSACTION_NONE);
+        Assert.assertEquals(Connection.TRANSACTION_NONE, conn.getTransactionIsolation());
+        conn.setTransactionIsolation(Connection.TRANSACTION_READ_UNCOMMITTED);
+    }
+
+    @Test
+    public void getTransactionIsolation() throws SQLException {
+        Assert.assertEquals(Connection.TRANSACTION_NONE, conn.getTransactionIsolation());
+    }
+
+    @Test
+    public void getWarnings() throws SQLException {
+        Assert.assertNull(conn.getWarnings());
+    }
+
+    @Test
+    public void clearWarnings() throws SQLException {
+        conn.clearWarnings();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testCreateStatement() throws SQLException {
+        Statement stmt = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
+        ResultSet rs = stmt.executeQuery("select server_status()");
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+
+        conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement() throws SQLException {
+        PreparedStatement pstmt = conn.prepareStatement("select server_status()",
+                ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
+        ResultSet rs = pstmt.executeQuery();
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+
+        conn.prepareStatement("select server_status", ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareCall() throws SQLException {
+        conn.prepareCall("", ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void getTypeMap() throws SQLException {
+        conn.getTypeMap();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setTypeMap() throws SQLException {
+        conn.setTypeMap(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setHoldability() throws SQLException {
+        conn.setHoldability(ResultSet.HOLD_CURSORS_OVER_COMMIT);
+        Assert.assertEquals(ResultSet.HOLD_CURSORS_OVER_COMMIT, conn.getHoldability());
+        conn.setHoldability(ResultSet.CLOSE_CURSORS_AT_COMMIT);
+    }
+
+    @Test
+    public void getHoldability() throws SQLException {
+        Assert.assertEquals(ResultSet.HOLD_CURSORS_OVER_COMMIT, conn.getHoldability());
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setSavepoint() throws SQLException {
+        conn.setSavepoint();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testSetSavepoint() throws SQLException {
+        conn.setSavepoint(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testRollback() throws SQLException {
+        conn.rollback(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void releaseSavepoint() throws SQLException {
+        conn.releaseSavepoint(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testCreateStatement1() throws SQLException {
+        Statement stmt = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+        ResultSet rs = stmt.executeQuery("select server_status()");
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+
+        conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement1() throws SQLException {
+        PreparedStatement pstmt = conn.prepareStatement("select server_status()",
+                ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+        ResultSet rs = pstmt.executeQuery();
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+
+        conn.prepareStatement("select server_status", ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareCall1() throws SQLException {
+        conn.prepareCall("", ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement2() throws SQLException {
+        Assert.assertNotNull("", Statement.NO_GENERATED_KEYS);
+        conn.prepareStatement("", Statement.RETURN_GENERATED_KEYS);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement3() throws SQLException {
+        conn.prepareStatement("", new int[]{});
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement4() throws SQLException {
+        conn.prepareStatement("", new String[]{});
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createClob() throws SQLException {
+        conn.createClob();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createBlob() throws SQLException {
+        conn.createBlob();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createNClob() throws SQLException {
+        conn.createNClob();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createSQLXML() throws SQLException {
+        conn.createSQLXML();
+    }
+
+    @Test(expected = SQLException.class)
+    public void isValid() throws SQLException {
+        Assert.assertTrue(conn.isValid(10));
+        Assert.assertTrue(conn.isValid(0));
+        conn.isValid(-1);
+    }
+
+    @Test
+    public void setClientInfo() throws SQLClientInfoException {
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "en_US.UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "UTC-8");
+    }
+
+    @Test
+    public void testSetClientInfo() throws SQLClientInfoException {
+        Properties properties = new Properties();
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+        conn.setClientInfo(properties);
+    }
+
+    @Test
+    public void getClientInfo() throws SQLException {
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+
+        Properties info = conn.getClientInfo();
+        String charset = info.getProperty(TSDBDriver.PROPERTY_KEY_CHARSET);
+        Assert.assertEquals("UTF-8", charset);
+        String locale = info.getProperty(TSDBDriver.PROPERTY_KEY_LOCALE);
+        Assert.assertEquals("en_US.UTF-8", locale);
+        String timezone = info.getProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE);
+        Assert.assertEquals("UTC-8", timezone);
+    }
+
+    @Test
+    public void testGetClientInfo() throws SQLException {
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+
+        String charset = conn.getClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET);
+        Assert.assertEquals("UTF-8", charset);
+        String locale = conn.getClientInfo(TSDBDriver.PROPERTY_KEY_LOCALE);
+        Assert.assertEquals("en_US.UTF-8", locale);
+        String timezone = conn.getClientInfo(TSDBDriver.PROPERTY_KEY_TIME_ZONE);
+        Assert.assertEquals("UTC-8", timezone);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createArrayOf() throws SQLException {
+        conn.createArrayOf("", null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createStruct() throws SQLException {
+        conn.createStruct("", null);
+    }
+
+    @Test
+    public void setSchema() throws SQLException {
+        conn.setSchema("test");
+    }
+
+    @Test
+    public void getSchema() throws SQLException {
+        Assert.assertNull(conn.getSchema());
+    }
+
+    @Test
+    public void abort() throws SQLException {
+        conn.abort(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setNetworkTimeout() throws SQLException {
+        conn.setNetworkTimeout(null, 1000);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void getNetworkTimeout() throws SQLException {
+        conn.getNetworkTimeout();
+    }
+
+    @Test
+    public void unwrap() {
+        try {
+            TSDBConnection tsdbConnection = conn.unwrap(TSDBConnection.class);
+            Assert.assertNotNull(tsdbConnection);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void isWrapperFor() throws SQLException {
+        Assert.assertTrue(conn.isWrapperFor(TSDBConnection.class));
+    }
+
+    @BeforeClass
+    public static void beforeClass() {
+        try {
+            Class.forName("com.taosdata.jdbc.TSDBDriver");
+            Properties properties = new Properties();
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+            conn = DriverManager.getConnection("jdbc:TAOS://" + host + ":6030/log?user=root&password=taosdata", properties);
+            // create test database for test cases
+            try (Statement stmt = conn.createStatement()) {
+                stmt.execute("create database if not exists test");
+            }
+
+        } catch (ClassNotFoundException | SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @AfterClass
+    public static void afterClass() {
+        try {
+            if (conn != null)
+                conn.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+}
\ No newline at end of file

src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBDriverTest.java

@@ -24,11 +24,10 @@ public class TSDBDriverTest {
             "jdbc:TAOS://:/test",
             "jdbc:TAOS://localhost:0/?user=root&password=taosdata"
     };
-
     private Connection conn;
 
     @Test
-    public void testConnectWithJdbcURL() {
+    public void connectWithJdbcURL() {
         final String url = "jdbc:TAOS://localhost:6030/log?user=root&password=taosdata";
         try {
             conn = DriverManager.getConnection(url);
@@ -40,7 +39,7 @@ public class TSDBDriverTest {
     }
 
     @Test
-    public void testConnectWithProperties() {
+    public void connectWithProperties() {
         final String jdbcUrl = "jdbc:TAOS://localhost:6030/log?user=root&password=taosdata";
         Properties connProps = new Properties();
         connProps.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
@@ -56,7 +55,7 @@ public class TSDBDriverTest {
     }
 
     @Test
-    public void testConnectWithConfigFile() {
+    public void connectWithConfigFile() {
         String jdbcUrl = "jdbc:TAOS://:/log?user=root&password=taosdata";
         Properties connProps = new Properties();
         connProps.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
@@ -71,16 +70,6 @@ public class TSDBDriverTest {
         }
     }
 
-    @Test(expected = SQLException.class)
-    public void testAcceptsURL() throws SQLException {
-        Driver driver = new TSDBDriver();
-        for (String url : validURLs) {
-            assertTrue("failure - acceptsURL(\" " + url + " \") should be true", driver.acceptsURL(url));
-        }
-        driver.acceptsURL(null);
-        fail("acceptsURL throws exception when parameter is null");
-    }
-
     @Test
     public void testParseURL() {
         TSDBDriver driver = new TSDBDriver();
@@ -121,8 +110,19 @@ public class TSDBDriverTest {
         assertNull("failure - dbname should be null", actual.getProperty("dbname"));
     }
 
+
+    @Test(expected = SQLException.class)
+    public void acceptsURL() throws SQLException {
+        Driver driver = new TSDBDriver();
+        for (String url : validURLs) {
+            assertTrue("failure - acceptsURL(\" " + url + " \") should be true", driver.acceptsURL(url));
+        }
+        driver.acceptsURL(null);
+        fail("acceptsURL throws exception when parameter is null");
+    }
+
     @Test
-    public void testGetPropertyInfo() throws SQLException {
+    public void getPropertyInfo() throws SQLException {
         Driver driver = new TSDBDriver();
         final String url = "jdbc:TAOS://localhost:6030/log?user=root&password=taosdata";
         Properties connProps = new Properties();
@@ -142,23 +142,23 @@ public class TSDBDriverTest {
     }
 
     @Test
-    public void testGetMajorVersion() {
-        assertEquals("failure - getMajorVersion should be 2", 2, new TSDBDriver().getMajorVersion());
+    public void getMajorVersion() {
+        assertEquals(2, new TSDBDriver().getMajorVersion());
     }
 
     @Test
-    public void testGetMinorVersion() {
-        assertEquals("failure - getMinorVersion should be 0", 0, new TSDBDriver().getMinorVersion());
+    public void getMinorVersion() {
+        assertEquals(0, new TSDBDriver().getMinorVersion());
     }
 
     @Test
-    public void testJdbcCompliant() {
-        assertFalse("failure - jdbcCompliant should be false", new TSDBDriver().jdbcCompliant());
+    public void jdbcCompliant() {
+        assertFalse(new TSDBDriver().jdbcCompliant());
     }
 
     @Test
-    public void testGetParentLogger() throws SQLFeatureNotSupportedException {
-        assertNull("failure - getParentLogger should be be null", new TSDBDriver().getParentLogger());
+    public void getParentLogger() throws SQLFeatureNotSupportedException {
+        assertNull(new TSDBDriver().getParentLogger());
     }
 
     @BeforeClass
@@ -169,6 +169,4 @@ public class TSDBDriverTest {
             e.printStackTrace();
         }
     }
-
-
 }
\ No newline at end of file

src/connector/jdbc/src/test/java/com/taosdata/jdbc/ImportTest.java → src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ImportTest.java

-package com.taosdata.jdbc;
+package com.taosdata.jdbc.cases;
 
+import com.taosdata.jdbc.TSDBDriver;
 import org.junit.*;
 import org.junit.runners.MethodSorters;
 

src/connector/jdbc/src/test/java/com/taosdata/jdbc/QueryDataTest.java → src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/QueryDataTest.java

-package com.taosdata.jdbc;
+package com.taosdata.jdbc.cases;
 
+import com.taosdata.jdbc.TSDBDriver;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;

src/connector/jdbc/src/test/java/com/taosdata/jdbc/SelectTest.java → src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/SelectTest.java

-package com.taosdata.jdbc;
+package com.taosdata.jdbc.cases;
 
+import com.taosdata.jdbc.TSDBDriver;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;

src/connector/jdbc/src/test/java/com/taosdata/jdbc/StableTest.java → src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/StableTest.java

-package com.taosdata.jdbc;
+package com.taosdata.jdbc.cases;
 
+import com.taosdata.jdbc.TSDBDriver;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.FixMethodOrder;

src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulConnectionTest.java

+package com.taosdata.jdbc.rs;
+
+import com.taosdata.jdbc.TSDBConnection;
+import com.taosdata.jdbc.TSDBDriver;
+import com.taosdata.jdbc.TSDBResultSet;
+import com.taosdata.jdbc.TSDBSubscribe;
+import org.junit.AfterClass;
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import javax.management.OperationsException;
+import java.sql.*;
+import java.util.Properties;
+
+public class RestfulConnectionTest {
+
+    //    private static final String host = "127.0.0.1";
+    private static final String host = "master";
+    private static Connection conn;
+
+    @Test
+    public void getConnection() {
+        // already test in beforeClass method
+    }
+
+    @Test
+    public void createStatement() {
+        try (Statement stmt = conn.createStatement()) {
+            ResultSet rs = stmt.executeQuery("select server_status()");
+            rs.next();
+            int status = rs.getInt("server_status()");
+            Assert.assertEquals(1, status);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void prepareStatement() throws SQLException {
+        PreparedStatement pstmt = conn.prepareStatement("select server_status()");
+        ResultSet rs = pstmt.executeQuery();
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void prepareCall() throws SQLException {
+        conn.prepareCall("select server_status()");
+    }
+
+    @Test
+    public void nativeSQL() throws SQLException {
+        String nativeSQL = conn.nativeSQL("select * from log.log");
+        Assert.assertEquals("select * from log.log", nativeSQL);
+    }
+
+    @Test
+    public void setAutoCommit() throws SQLException {
+        conn.setAutoCommit(true);
+        conn.setAutoCommit(false);
+    }
+
+    @Test
+    public void getAutoCommit() throws SQLException {
+        Assert.assertTrue(conn.getAutoCommit());
+    }
+
+    @Test
+    public void commit() throws SQLException {
+        conn.commit();
+    }
+
+    @Test
+    public void rollback() throws SQLException {
+        conn.rollback();
+    }
+
+    @Test
+    public void close() {
+        // connection will close in afterClass method
+    }
+
+    @Test
+    public void isClosed() throws SQLException {
+        Assert.assertFalse(conn.isClosed());
+    }
+
+    @Test
+    public void getMetaData() throws SQLException {
+        DatabaseMetaData meta = conn.getMetaData();
+        Assert.assertNotNull(meta);
+        Assert.assertEquals("com.taosdata.jdbc.rs.RestfulDriver", meta.getDriverName());
+    }
+
+    @Test
+    public void setReadOnly() throws SQLException {
+        conn.setReadOnly(true);
+    }
+
+    @Test
+    public void isReadOnly() throws SQLException {
+        Assert.assertTrue(conn.isReadOnly());
+    }
+
+    @Test
+    public void setCatalog() throws SQLException {
+        conn.setCatalog("test");
+        Assert.assertEquals("test", conn.getCatalog());
+    }
+
+    @Test
+    public void getCatalog() throws SQLException {
+        conn.setCatalog("log");
+        Assert.assertEquals("log", conn.getCatalog());
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setTransactionIsolation() throws SQLException {
+        conn.setTransactionIsolation(Connection.TRANSACTION_NONE);
+        Assert.assertEquals(Connection.TRANSACTION_NONE, conn.getTransactionIsolation());
+        conn.setTransactionIsolation(Connection.TRANSACTION_READ_UNCOMMITTED);
+    }
+
+    @Test
+    public void getTransactionIsolation() throws SQLException {
+        Assert.assertEquals(Connection.TRANSACTION_NONE, conn.getTransactionIsolation());
+    }
+
+    @Test
+    public void getWarnings() throws SQLException {
+        Assert.assertNull(conn.getWarnings());
+    }
+
+    @Test
+    public void clearWarnings() throws SQLException {
+        conn.clearWarnings();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testCreateStatement() throws SQLException {
+        Statement stmt = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
+        ResultSet rs = stmt.executeQuery("select server_status()");
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+
+        conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement() throws SQLException {
+        PreparedStatement pstmt = conn.prepareStatement("select server_status()",
+                ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
+        ResultSet rs = pstmt.executeQuery();
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+
+        conn.prepareStatement("select server_status", ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareCall() throws SQLException {
+        conn.prepareCall("", ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void getTypeMap() throws SQLException {
+        conn.getTypeMap();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setTypeMap() throws SQLException {
+        conn.setTypeMap(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setHoldability() throws SQLException {
+        conn.setHoldability(ResultSet.HOLD_CURSORS_OVER_COMMIT);
+        Assert.assertEquals(ResultSet.HOLD_CURSORS_OVER_COMMIT, conn.getHoldability());
+        conn.setHoldability(ResultSet.CLOSE_CURSORS_AT_COMMIT);
+    }
+
+    @Test
+    public void getHoldability() throws SQLException {
+        Assert.assertEquals(ResultSet.HOLD_CURSORS_OVER_COMMIT, conn.getHoldability());
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setSavepoint() throws SQLException {
+        conn.setSavepoint();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testSetSavepoint() throws SQLException {
+        conn.setSavepoint(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testRollback() throws SQLException {
+        conn.rollback(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void releaseSavepoint() throws SQLException {
+        conn.releaseSavepoint(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testCreateStatement1() throws SQLException {
+        Statement stmt = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+        ResultSet rs = stmt.executeQuery("select server_status()");
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+
+        conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement1() throws SQLException {
+        PreparedStatement pstmt = conn.prepareStatement("select server_status()",
+                ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+        ResultSet rs = pstmt.executeQuery();
+        rs.next();
+        int status = rs.getInt("server_status()");
+        Assert.assertEquals(1, status);
+
+        conn.prepareStatement("select server_status", ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareCall1() throws SQLException {
+        conn.prepareCall("", ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement2() throws SQLException {
+        Assert.assertNotNull("", Statement.NO_GENERATED_KEYS);
+        conn.prepareStatement("", Statement.RETURN_GENERATED_KEYS);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement3() throws SQLException {
+        conn.prepareStatement("", new int[]{});
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void testPrepareStatement4() throws SQLException {
+        conn.prepareStatement("", new String[]{});
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createClob() throws SQLException {
+        conn.createClob();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createBlob() throws SQLException {
+        conn.createBlob();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createNClob() throws SQLException {
+        conn.createNClob();
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createSQLXML() throws SQLException {
+        conn.createSQLXML();
+    }
+
+    @Test(expected = SQLException.class)
+    public void isValid() throws SQLException {
+        Assert.assertTrue(conn.isValid(10));
+        Assert.assertTrue(conn.isValid(0));
+        conn.isValid(-1);
+    }
+
+    @Test
+    public void setClientInfo() throws SQLClientInfoException {
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "en_US.UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "UTC-8");
+    }
+
+    @Test
+    public void testSetClientInfo() throws SQLClientInfoException {
+        Properties properties = new Properties();
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+        conn.setClientInfo(properties);
+    }
+
+    @Test
+    public void getClientInfo() throws SQLException {
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+
+        Properties info = conn.getClientInfo();
+        String charset = info.getProperty(TSDBDriver.PROPERTY_KEY_CHARSET);
+        Assert.assertEquals("UTF-8", charset);
+        String locale = info.getProperty(TSDBDriver.PROPERTY_KEY_LOCALE);
+        Assert.assertEquals("en_US.UTF-8", locale);
+        String timezone = info.getProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE);
+        Assert.assertEquals("UTC-8", timezone);
+    }
+
+    @Test
+    public void testGetClientInfo() throws SQLException {
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+        conn.setClientInfo(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+
+        String charset = conn.getClientInfo(TSDBDriver.PROPERTY_KEY_CHARSET);
+        Assert.assertEquals("UTF-8", charset);
+        String locale = conn.getClientInfo(TSDBDriver.PROPERTY_KEY_LOCALE);
+        Assert.assertEquals("en_US.UTF-8", locale);
+        String timezone = conn.getClientInfo(TSDBDriver.PROPERTY_KEY_TIME_ZONE);
+        Assert.assertEquals("UTC-8", timezone);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createArrayOf() throws SQLException {
+        conn.createArrayOf("", null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void createStruct() throws SQLException {
+        conn.createStruct("", null);
+    }
+
+    @Test
+    public void setSchema() throws SQLException {
+        conn.setSchema("test");
+    }
+
+    @Test
+    public void getSchema() throws SQLException {
+        Assert.assertNull(conn.getSchema());
+    }
+
+    @Test
+    public void abort() throws SQLException {
+        conn.abort(null);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void setNetworkTimeout() throws SQLException {
+        conn.setNetworkTimeout(null, 1000);
+    }
+
+    @Test(expected = SQLFeatureNotSupportedException.class)
+    public void getNetworkTimeout() throws SQLException {
+        conn.getNetworkTimeout();
+    }
+
+    @Test
+    public void unwrap() {
+        try {
+            RestfulConnection restfulConnection = conn.unwrap(RestfulConnection.class);
+            Assert.assertNotNull(restfulConnection);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void isWrapperFor() throws SQLException {
+        Assert.assertTrue(conn.isWrapperFor(RestfulConnection.class));
+    }
+
+    @BeforeClass
+    public static void beforeClass() {
+        try {
+            Class.forName("com.taosdata.jdbc.rs.RestfulDriver");
+            Properties properties = new Properties();
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+            conn = DriverManager.getConnection("jdbc:TAOS-RS://" + host + ":6041/log?user=root&password=taosdata", properties);
+            // create test database for test cases
+            try (Statement stmt = conn.createStatement()) {
+                stmt.execute("create database if not exists test");
+            }
+
+        } catch (ClassNotFoundException | SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @AfterClass
+    public static void afterClass() {
+        try {
+            if (conn != null)
+                conn.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+}
\ No newline at end of file

src/connector/python/linux/python2/taos/cinterface.py

@@ -67,13 +67,13 @@ def _crow_tinyint_unsigned_to_python(
         return [
             None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_byte))[
+                    ctypes.c_ubyte))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_byte))[
+                    ctypes.c_ubyte))[
                 :abs(num_of_rows)]]
 
 
@@ -102,13 +102,13 @@ def _crow_smallint_unsigned_to_python(
         return [
             None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_short))[
+                    ctypes.c_ushort))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_short))[
+                    ctypes.c_ushort))[
                 :abs(num_of_rows)]]
 
 
@@ -130,13 +130,13 @@ def _crow_int_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
         return [
             None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_int))[
+                    ctypes.c_uint))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_int))[
+                    ctypes.c_uint))[
                 :abs(num_of_rows)]]
 
 
@@ -162,13 +162,13 @@ def _crow_bigint_unsigned_to_python(
         return [
             None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_long))[
+                    ctypes.c_ulong))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_long))[
+                    ctypes.c_ulong))[
                 :abs(num_of_rows)]]
 
 

src/connector/python/linux/python2/taos/constants.py

@@ -19,10 +19,10 @@ class FieldType(object):
     C_BINARY = 8
     C_TIMESTAMP = 9
     C_NCHAR = 10
-    C_TINYINT_UNSIGNED = 12
-    C_SMALLINT_UNSIGNED = 13
-    C_INT_UNSIGNED = 14
-    C_BIGINT_UNSIGNED = 15
+    C_TINYINT_UNSIGNED = 11
+    C_SMALLINT_UNSIGNED = 12
+    C_INT_UNSIGNED = 13
+    C_BIGINT_UNSIGNED = 14
     # NULL value definition
     # NOTE: These values should change according to C definition in tsdb.h
     C_BOOL_NULL = 0x02

src/connector/python/linux/python3/taos/cinterface.py

@@ -67,13 +67,13 @@ def _crow_tinyint_unsigned_to_python(
         return [
             None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_byte))[
+                    ctypes.c_ubyte))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_byte))[
+                    ctypes.c_ubyte))[
                 :abs(num_of_rows)]]
 
 
@@ -102,13 +102,13 @@ def _crow_smallint_unsigned_to_python(
         return [
             None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_short))[
+                    ctypes.c_ushort))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_short))[
+                    ctypes.c_ushort))[
                 :abs(num_of_rows)]]
 
 
@@ -130,13 +130,13 @@ def _crow_int_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
         return [
             None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_int))[
+                    ctypes.c_uint))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_int))[
+                    ctypes.c_uint))[
                 :abs(num_of_rows)]]
 
 
@@ -162,13 +162,13 @@ def _crow_bigint_unsigned_to_python(
         return [
             None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_long))[
+                    ctypes.c_ulong))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_long))[
+                    ctypes.c_ulong))[
                 :abs(num_of_rows)]]
 
 

src/connector/python/linux/python3/taos/constants.py

@@ -19,10 +19,10 @@ class FieldType(object):
     C_BINARY = 8
     C_TIMESTAMP = 9
     C_NCHAR = 10
-    C_TINYINT_UNSIGNED = 12
-    C_SMALLINT_UNSIGNED = 13
-    C_INT_UNSIGNED = 14
-    C_BIGINT_UNSIGNED = 15
+    C_TINYINT_UNSIGNED = 11
+    C_SMALLINT_UNSIGNED = 12
+    C_INT_UNSIGNED = 13
+    C_BIGINT_UNSIGNED = 14
     # NULL value definition
     # NOTE: These values should change according to C definition in tsdb.h
     C_BOOL_NULL = 0x02

src/connector/python/osx/python3/taos/cinterface.py

@@ -67,13 +67,13 @@ def _crow_tinyint_unsigned_to_python(
         return [
             None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_byte))[
+                    ctypes.c_ubyte))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_byte))[
+                    ctypes.c_ubyte))[
                 :abs(num_of_rows)]]
 
 
@@ -102,13 +102,13 @@ def _crow_smallint_unsigned_to_python(
         return [
             None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_short))[
+                    ctypes.c_ushort))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_short))[
+                    ctypes.c_ushort))[
                 :abs(num_of_rows)]]
 
 
@@ -130,13 +130,13 @@ def _crow_int_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
         return [
             None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_int))[
+                    ctypes.c_uint))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_int))[
+                    ctypes.c_uint))[
                 :abs(num_of_rows)]]
 
 
@@ -162,13 +162,13 @@ def _crow_bigint_unsigned_to_python(
         return [
             None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_long))[
+                    ctypes.c_ulong))[
                 :abs(num_of_rows)]]
     else:
         return [
             None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
                 data, ctypes.POINTER(
-                    ctypes.c_long))[
+                    ctypes.c_ulong))[
                 :abs(num_of_rows)]]
 
 

src/connector/python/osx/python3/taos/constants.py

@@ -19,10 +19,10 @@ class FieldType(object):
     C_BINARY = 8
     C_TIMESTAMP = 9
     C_NCHAR = 10
-    C_TINYINT_UNSIGNED = 12
-    C_SMALLINT_UNSIGNED = 13
-    C_INT_UNSIGNED = 14
-    C_BIGINT_UNSIGNED = 15
+    C_TINYINT_UNSIGNED = 11
+    C_SMALLINT_UNSIGNED = 12
+    C_INT_UNSIGNED = 13
+    C_BIGINT_UNSIGNED = 14
     # NULL value definition
     # NOTE: These values should change according to C definition in tsdb.h
     C_BOOL_NULL = 0x02

src/connector/python/windows/python2/taos/__init__.py

@@ -8,6 +8,7 @@ paramstyle = 'pyformat'
 
 __all__ = ['connection', 'cursor']
 
+
 def connect(*args, **kwargs):
     """ Function to return a TDengine connector object
 

src/connector/python/windows/python2/taos/connection.py

@@ -2,9 +2,11 @@ from .cursor import TDengineCursor
 from .subscription import TDengineSubscription
 from .cinterface import CTaosInterface
 
+
 class TDengineConnection(object):
     """ TDengine connection object
     """
+
     def __init__(self, *args, **kwargs):
         self._conn = None
         self._host = None
@@ -44,7 +46,12 @@ class TDengineConnection(object):
             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.
@@ -56,7 +63,8 @@ class TDengineConnection(object):
         """
         if self._conn is None:
             return None
-        sub = CTaosInterface.subscribe(self._conn, restart, topic, sql, interval)
+        sub = CTaosInterface.subscribe(
+            self._conn, restart, topic, sql, interval)
         return TDengineSubscription(sub)
 
     def cursor(self):
@@ -81,6 +89,7 @@ class TDengineConnection(object):
         """
         pass
 
+
 if __name__ == "__main__":
     conn = TDengineConnection(host='192.168.1.107')
     conn.close()

src/connector/python/windows/python2/taos/constants.py

@@ -3,6 +3,7 @@
 
 from .dbapi import *
 
+
 class FieldType(object):
     """TDengine Field Types
     """
@@ -18,13 +19,21 @@ class FieldType(object):
     C_BINARY = 8
     C_TIMESTAMP = 9
     C_NCHAR = 10
+    C_TINYINT_UNSIGNED = 11
+    C_SMALLINT_UNSIGNED = 12
+    C_INT_UNSIGNED = 13
+    C_BIGINT_UNSIGNED = 14
     # NULL value definition
     # NOTE: These values should change according to C definition in tsdb.h
     C_BOOL_NULL = 0x02
     C_TINYINT_NULL = -128
+    C_TINYINT_UNSIGNED_NULL = 255
     C_SMALLINT_NULL = -32768
+    C_SMALLINT_UNSIGNED_NULL = 65535
     C_INT_NULL = -2147483648
+    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)])

src/connector/python/windows/python2/taos/cursor.py

@@ -5,6 +5,7 @@ import threading
 
 # querySeqNum = 0
 
+
 class TDengineCursor(object):
     """Database cursor which is used to manage the context of a fetch operation.
 
@@ -50,7 +51,8 @@ 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 = CTaosInterface.fetchRow(
+                self._result, self._fields)
             if self._block_rows == 0:
                 raise StopIteration
             self._block = list(map(tuple, zip(*block)))
@@ -117,8 +119,9 @@ class TDengineCursor(object):
         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 )
+                self._affected_rows += CTaosInterface.affectedRows(
+                    self._result)
+                return CTaosInterface.affectedRows(self._result)
             else:
                 self._fields = CTaosInterface.useResult(self._result)
                 return self._handle_result()
@@ -147,10 +150,13 @@ class TDengineCursor(object):
         buffer = [[] for i in range(len(self._fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchRow(self._result, self._fields)
+            block, num_of_fields = CTaosInterface.fetchRow(
+                self._result, self._fields)
             errno = CTaosInterface.libtaos.taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(CTaosInterface.errStr(self._result), errno)
+                raise ProgrammingError(
+                    CTaosInterface.errStr(
+                        self._result), errno)
             if num_of_fields == 0:
                 break
             self._rowcount += num_of_fields
@@ -165,20 +171,21 @@ class TDengineCursor(object):
         buffer = [[] for i in range(len(self._fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchBlock(self._result, self._fields)
+            block, num_of_fields = CTaosInterface.fetchBlock(
+                self._result, self._fields)
             errno = CTaosInterface.libtaos.taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(CTaosInterface.errStr(self._result), errno)
-            if num_of_fields == 0: break
+                raise ProgrammingError(
+                    CTaosInterface.errStr(
+                        self._result), errno)
+            if num_of_fields == 0:
+                break
             self._rowcount += num_of_fields
             for i in range(len(self._fields)):
                 buffer[i].extend(block[i])
 
-        
         return list(map(tuple, zip(*buffer)))
 
-
-
     def nextset(self):
         """
         """
@@ -209,6 +216,7 @@ class TDengineCursor(object):
         """
         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

src/connector/python/windows/python2/taos/dbapi.py

@@ -4,6 +4,7 @@
 import time
 import datetime
 
+
 class DBAPITypeObject(object):
     def __init__(self, *values):
         self.values = values
@@ -16,19 +17,24 @@ class DBAPITypeObject(object):
         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())

src/connector/python/windows/python2/taos/error.py

 """Python exceptions
 """
 
+
 class Error(Exception):
     def __init__(self, msg=None, errno=None):
         self.msg = msg
@@ -10,26 +11,31 @@ class Error(Exception):
     def __str__(self):
         return self._full_msg
 
+
 class Warning(Exception):
     """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.
     """
     pass
 
+
 class DatabaseError(Error):
     """Exception raised for errors that are related to the database.
     """
     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.
     """
     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
     """
@@ -41,16 +47,19 @@ class IntegrityError(DatabaseError):
     """
     pass
 
+
 class InternalError(DatabaseError):
     """Exception raised when the database encounters an internal error.
     """
     pass
 
+
 class ProgrammingError(DatabaseError):
     """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,.
     """

src/connector/python/windows/python2/taos/subscription.py

 from .cinterface import CTaosInterface
 from .error import *
 
+
 class TDengineSubscription(object):
     """TDengine subscription object
     """
+
     def __init__(self, sub):
         self._sub = sub
 
-
     def consume(self):
         """Consume rows of a subscription
         """
@@ -18,15 +19,15 @@ class TDengineSubscription(object):
         buffer = [[] for i in range(len(fields))]
         while True:
             block, num_of_fields = CTaosInterface.fetchBlock(result, fields)
-            if num_of_fields == 0: break
+            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)))
 
-
-    def close(self, keepProgress = True):
+    def close(self, keepProgress=True):
         """Close the Subscription.
         """
         if self._sub is None:
@@ -38,12 +39,16 @@ class TDengineSubscription(object):
 
 if __name__ == '__main__':
     from .connection import TDengineConnection
-    conn = TDengineConnection(host="127.0.0.1", user="root", password="taosdata", database="test")
+    conn = TDengineConnection(
+        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)
 
-    for i in range(0,10):
+    for i in range(0, 10):
         data = sub.consume()
         for d in data:
             print(d)

src/connector/python/windows/python3/taos/__init__.py

@@ -8,6 +8,7 @@ paramstyle = 'pyformat'
 
 __all__ = ['connection', 'cursor']
 
+
 def connect(*args, **kwargs):
     """ Function to return a TDengine connector object
 

src/connector/python/windows/python3/taos/connection.py

@@ -2,9 +2,11 @@ from .cursor import TDengineCursor
 from .subscription import TDengineSubscription
 from .cinterface import CTaosInterface
 
+
 class TDengineConnection(object):
     """ TDengine connection object
     """
+
     def __init__(self, *args, **kwargs):
         self._conn = None
         self._host = None
@@ -44,7 +46,12 @@ class TDengineConnection(object):
             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.
@@ -56,7 +63,8 @@ class TDengineConnection(object):
         """
         if self._conn is None:
             return None
-        sub = CTaosInterface.subscribe(self._conn, restart, topic, sql, interval)
+        sub = CTaosInterface.subscribe(
+            self._conn, restart, topic, sql, interval)
         return TDengineSubscription(sub)
 
     def cursor(self):
@@ -81,6 +89,7 @@ class TDengineConnection(object):
         """
         pass
 
+
 if __name__ == "__main__":
     conn = TDengineConnection(host='192.168.1.107')
     conn.close()

src/connector/python/windows/python3/taos/constants.py

@@ -3,6 +3,7 @@
 
 from .dbapi import *
 
+
 class FieldType(object):
     """TDengine Field Types
     """
@@ -18,13 +19,21 @@ class FieldType(object):
     C_BINARY = 8
     C_TIMESTAMP = 9
     C_NCHAR = 10
+    C_TINYINT_UNSIGNED = 11
+    C_SMALLINT_UNSIGNED = 12
+    C_INT_UNSIGNED = 13
+    C_BIGINT_UNSIGNED = 14
     # NULL value definition
     # NOTE: These values should change according to C definition in tsdb.h
     C_BOOL_NULL = 0x02
     C_TINYINT_NULL = -128
+    C_TINYINT_UNSIGNED_NULL = 255
     C_SMALLINT_NULL = -32768
+    C_SMALLINT_UNSIGNED_NULL = 65535
     C_INT_NULL = -2147483648
+    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)])

src/connector/python/windows/python3/taos/dbapi.py

@@ -4,6 +4,7 @@
 import time
 import datetime
 
+
 class DBAPITypeObject(object):
     def __init__(self, *values):
         self.values = values
@@ -16,19 +17,24 @@ class DBAPITypeObject(object):
         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())

src/plugins/http/src/httpContext.c

@@ -155,6 +155,7 @@ void httpReleaseContext(HttpContext *pContext, bool clearRes) {
 
   if (clearRes) {
     httpClearParser(pContext->parser);
+    memset(&pContext->singleCmd, 0, sizeof(HttpSqlCmd));
   }
 
   HttpContext **ppContext = pContext->ppContext;
@@ -185,9 +186,9 @@ void httpCloseContextByApp(HttpContext *pContext) {
   pContext->parsed = false;
   bool keepAlive = true;
 
-  if (parser->httpVersion == HTTP_VERSION_10 && parser->keepAlive != HTTP_KEEPALIVE_ENABLE) {
+  if (parser && parser->httpVersion == HTTP_VERSION_10 && parser->keepAlive != HTTP_KEEPALIVE_ENABLE) {
     keepAlive = false;
-  } else if (parser->httpVersion != HTTP_VERSION_10 && parser->keepAlive == HTTP_KEEPALIVE_DISABLE) {
+  } else if (parser && parser->httpVersion != HTTP_VERSION_10 && parser->keepAlive == HTTP_KEEPALIVE_DISABLE) {
     keepAlive = false;
   } else {
   }