diff --git a/src/client/src/tscProfile.c b/src/client/src/tscProfile.c
index 777a136a6e215110aaebb2ff93f97456dd215dcf..b9ef98681001b657dafe02214853ef28e02e559c 100644
--- a/src/client/src/tscProfile.c
+++ b/src/client/src/tscProfile.c
@@ -54,14 +54,14 @@ void tscAddIntoSqlList(SSqlObj *pSql) {
   pSql->next = pObj->sqlList;
   if (pObj->sqlList) pObj->sqlList->prev = pSql;
   pObj->sqlList = pSql;
-  pSql->queryId = queryId++;
+  pSql->queryId = atomic_fetch_add_32(&queryId, 1);
 
   pthread_mutex_unlock(&pObj->mutex);
 
   pSql->stime = taosGetTimestampMs();
   pSql->listed = 1;
 
-  tscDebug("0x%"PRIx64" added into sqlList", pSql->self);
+  tscDebug("0x%"PRIx64" added into sqlList, queryId:%u", pSql->self, pSql->queryId);
 }
 
 void tscSaveSlowQueryFpCb(void *param, TAOS_RES *result, int code) {
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index cb863e55b61f70c062274a78fe4cfc593a3b2760..a698e239df4d5fcd15d2240e9464e1f52fefb5ec 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -2859,16 +2859,21 @@ void tscDoQuery(SSqlObj* pSql) {
     return;
   }
   
-  if (pCmd->command == TSDB_SQL_SELECT) {
-    tscAddIntoSqlList(pSql);
-  }
-
   if (pCmd->dataSourceType == DATA_FROM_DATA_FILE) {
     tscImportDataFromFile(pSql);
   } else {
     SQueryInfo *pQueryInfo = tscGetQueryInfo(pCmd, pCmd->clauseIndex);
     uint16_t type = pQueryInfo->type;
 
+    if ((pCmd->command == TSDB_SQL_SELECT) && (!TSDB_QUERY_HAS_TYPE(type, TSDB_QUERY_TYPE_SUBQUERY)) && (!TSDB_QUERY_HAS_TYPE(type, TSDB_QUERY_TYPE_STABLE_SUBQUERY))) {
+      tscAddIntoSqlList(pSql);
+    }
+  
+    if (TSDB_QUERY_HAS_TYPE(type, TSDB_QUERY_TYPE_INSERT)) {  // multi-vnodes insertion
+      tscHandleMultivnodeInsert(pSql);
+      return;
+    }
+
     if (QUERY_IS_JOIN_QUERY(type)) {
       if (!TSDB_QUERY_HAS_TYPE(type, TSDB_QUERY_TYPE_SUBQUERY)) {
         tscHandleMasterJoinQuery(pSql);
diff --git a/src/client/tests/timeParseTest.cpp b/src/client/tests/timeParseTest.cpp
index ba06a6b9aa775dc9cad6191e5d85f6475c017f1b..692398e3b7329b31ac02d4c36635000d4721d8fc 100644
--- a/src/client/tests/timeParseTest.cpp
+++ b/src/client/tests/timeParseTest.cpp
@@ -98,7 +98,7 @@ TEST(testCase, parse_time) {
   taosParseTime(t41, &time, strlen(t41), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, 852048000999);
 
-  int64_t k = timezone;
+//  int64_t k = timezone;
   char    t42[] = "1997-1-1T0:0:0.999999999Z";
   taosParseTime(t42, &time, strlen(t42), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, 852048000999 - timezone * MILLISECOND_PER_SECOND);
@@ -163,7 +163,7 @@ TEST(testCase, parse_time) {
   taosParseTime(t13, &time, strlen(t13), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, -28800 * MILLISECOND_PER_SECOND);
 
-  char* t = "2021-01-08T02:11:40.000+00:00";
+  char t[] = "2021-01-08T02:11:40.000+00:00";
   taosParseTime(t, &time, strlen(t), TSDB_TIME_PRECISION_MILLI, 0);
   printf("%ld\n", time);
 }
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConstants.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConstants.java
index 37073e243fef99176c6d3d16d87d7cdaabb0e1b4..f38555ce8a6c7ee946b3bdbda2204c702b49198a 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConstants.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConstants.java
@@ -30,6 +30,7 @@ public abstract class TSDBConstants {
     public static final int JNI_FETCH_END = -6;
     public static final int JNI_OUT_OF_MEMORY = -7;
     // TSDB Data Types
+    public static final int TSDB_DATA_TYPE_NULL = 0;
     public static final int TSDB_DATA_TYPE_BOOL = 1;
     public static final int TSDB_DATA_TYPE_TINYINT = 2;
     public static final int TSDB_DATA_TYPE_SMALLINT = 3;
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSet.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSet.java
index db635f5f79f187dab98cb9fdfdc50369ca682fa9..530b433d42bf4b387db0e9973ddcf48e3844f2f3 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSet.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSet.java
@@ -6,11 +6,13 @@ import com.google.common.primitives.Ints;
 import com.google.common.primitives.Longs;
 import com.google.common.primitives.Shorts;
 import com.taosdata.jdbc.*;
+import com.taosdata.jdbc.utils.Utils;
 
 import java.math.BigDecimal;
 import java.sql.*;
 import java.time.Instant;
 import java.time.ZoneOffset;
+import java.time.format.DateTimeParseException;
 import java.util.ArrayList;
 import java.util.Calendar;
 
@@ -18,14 +20,13 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
     private volatile boolean isClosed;
     private int pos = -1;
 
-
     private final String database;
     private final Statement statement;
     // data
-    private final ArrayList<ArrayList<Object>> resultSet;
+    private final ArrayList<ArrayList<Object>> resultSet = new ArrayList<>();
     // meta
-    private ArrayList<String> columnNames;
-    private ArrayList<Field> columns;
+    private ArrayList<String> columnNames = new ArrayList<>();
+    private ArrayList<Field> columns = new ArrayList<>();
     private RestfulResultSetMetaData metaData;
 
     /**
@@ -37,10 +38,46 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
         this.database = database;
         this.statement = statement;
 
-        // column metadata
+        // get column metadata
         JSONArray columnMeta = resultJson.getJSONArray("column_meta");
-        columnNames = new ArrayList<>();
-        columns = new ArrayList<>();
+        // get row data
+        JSONArray data = resultJson.getJSONArray("data");
+        if (data == null || data.isEmpty()) {
+            columnNames.clear();
+            columns.clear();
+            this.resultSet.clear();
+            return;
+        }
+        // get head
+        JSONArray head = resultJson.getJSONArray("head");
+        // get rows
+        Integer rows = resultJson.getInteger("rows");
+        // parse column_meta
+        if (columnMeta != null) {
+            parseColumnMeta_new(columnMeta);
+        } else {
+            parseColumnMeta_old(head, data, rows);
+        }
+        this.metaData = new RestfulResultSetMetaData(this.database, columns, this);
+        // parse row data
+        resultSet.clear();
+        for (int rowIndex = 0; rowIndex < data.size(); rowIndex++) {
+            ArrayList row = new ArrayList();
+            JSONArray jsonRow = data.getJSONArray(rowIndex);
+            for (int colIndex = 0; colIndex < this.metaData.getColumnCount(); colIndex++) {
+                row.add(parseColumnData(jsonRow, colIndex, columns.get(colIndex).taos_type));
+            }
+            resultSet.add(row);
+        }
+    }
+
+    /***
+     * use this method after TDengine-2.0.18.0 to parse column meta, restful add column_meta in resultSet
+     * @Param columnMeta
+     */
+    private void parseColumnMeta_new(JSONArray columnMeta) throws SQLException {
+        columnNames.clear();
+        columns.clear();
         for (int colIndex = 0; colIndex < columnMeta.size(); colIndex++) {
             JSONArray col = columnMeta.getJSONArray(colIndex);
             String col_name = col.getString(0);
@@ -50,23 +87,55 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
             columnNames.add(col_name);
             columns.add(new Field(col_name, col_type, col_length, "", taos_type));
         }
-        this.metaData = new RestfulResultSetMetaData(this.database, columns, this);
+    }
 
-        // row data
-        JSONArray data = resultJson.getJSONArray("data");
-        resultSet = new ArrayList<>();
-        for (int rowIndex = 0; rowIndex < data.size(); rowIndex++) {
-            ArrayList row = new ArrayList();
-            JSONArray jsonRow = data.getJSONArray(rowIndex);
-            for (int colIndex = 0; colIndex < jsonRow.size(); colIndex++) {
-                row.add(parseColumnData(jsonRow, colIndex, columns.get(colIndex).taos_type));
+    /**
+     * use this method before TDengine-2.0.18.0 to parse column meta
+     */
+    private void parseColumnMeta_old(JSONArray head, JSONArray data, int rows) {
+        columnNames.clear();
+        columns.clear();
+        for (int colIndex = 0; colIndex < head.size(); colIndex++) {
+            String col_name = head.getString(colIndex);
+            columnNames.add(col_name);
+
+            int col_type = Types.NULL;
+            int col_length = 0;
+            int taos_type = TSDBConstants.TSDB_DATA_TYPE_NULL;
+
+            JSONArray row0Json = data.getJSONArray(0);
+            if (colIndex < row0Json.size()) {
+                Object value = row0Json.get(colIndex);
+                if (value instanceof Boolean) {
+                    col_type = Types.BOOLEAN;
+                    col_length = 1;
+                    taos_type = TSDBConstants.TSDB_DATA_TYPE_BOOL;
+                }
+                if (value instanceof Byte || value instanceof Short || value instanceof Integer || value instanceof Long) {
+                    col_type = Types.BIGINT;
+                    col_length = 8;
+                    taos_type = TSDBConstants.TSDB_DATA_TYPE_BIGINT;
+                }
+                if (value instanceof Float || value instanceof Double || value instanceof BigDecimal) {
+                    col_type = Types.DOUBLE;
+                    col_length = 8;
+                    taos_type = TSDBConstants.TSDB_DATA_TYPE_DOUBLE;
+                }
+                if (value instanceof String) {
+                    col_type = Types.NCHAR;
+                    col_length = ((String) value).length();
+                    taos_type = TSDBConstants.TSDB_DATA_TYPE_NCHAR;
+                }
             }
-            resultSet.add(row);
+            columns.add(new Field(col_name, col_type, col_length, "", taos_type));
         }
     }
 
+
     private Object parseColumnData(JSONArray row, int colIndex, int taosType) throws SQLException {
         switch (taosType) {
+            case TSDBConstants.TSDB_DATA_TYPE_NULL:
+                return null;
             case TSDBConstants.TSDB_DATA_TYPE_BOOL:
                 return row.getBoolean(colIndex);
             case TSDBConstants.TSDB_DATA_TYPE_TINYINT:
@@ -290,8 +359,10 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
             return 0;
         }
         wasNull = false;
-        if (value instanceof Float || value instanceof Double)
+        if (value instanceof Float)
             return (float) value;
+        if (value instanceof Double)
+            return new Float((Double) value);
         return Float.parseFloat(value.toString());
     }
 
@@ -329,6 +400,9 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
             return Shorts.toByteArray((short) value);
         if (value instanceof Byte)
             return new byte[]{(byte) value};
+        if (value instanceof Timestamp) {
+            return Utils.formatTimestamp((Timestamp) value).getBytes();
+        }
 
         return value.toString().getBytes();
     }
@@ -342,7 +416,9 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
             return null;
         if (value instanceof Timestamp)
             return new Date(((Timestamp) value).getTime());
-        return Date.valueOf(value.toString());
+        Date date = null;
+        date = Utils.parseDate(value.toString());
+        return date;
     }
 
     @Override
@@ -354,7 +430,13 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
             return null;
         if (value instanceof Timestamp)
             return new Time(((Timestamp) value).getTime());
-        return Time.valueOf(value.toString());
+        Time time = null;
+        try {
+            time = Utils.parseTime(value.toString());
+        } catch (DateTimeParseException e) {
+            time = null;
+        }
+        return time;
     }
 
     @Override
@@ -366,14 +448,20 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
             return null;
         if (value instanceof Timestamp)
             return (Timestamp) value;
-//        if (value instanceof Long) {
-//            if (1_0000_0000_0000_0L > (long) value)
-//                return Timestamp.from(Instant.ofEpochMilli((long) value));
-//            long epochSec = (long) value / 1000_000L;
-//            long nanoAdjustment = (long) ((long) value % 1000_000L * 1000);
-//            return Timestamp.from(Instant.ofEpochSecond(epochSec, nanoAdjustment));
-//        }
-        return Timestamp.valueOf(value.toString());
+        if (value instanceof Long) {
+            if (1_0000_0000_0000_0L > (long) value)
+                return Timestamp.from(Instant.ofEpochMilli((long) value));
+            long epochSec = (long) value / 1000_000L;
+            long nanoAdjustment = (long) value % 1000_000L * 1000;
+            return Timestamp.from(Instant.ofEpochSecond(epochSec, nanoAdjustment));
+        }
+        Timestamp ret;
+        try {
+            ret = Utils.parseTimestamp(value.toString());
+        } catch (Exception e) {
+            ret = null;
+        }
+        return ret;
     }
 
     @Override
@@ -415,7 +503,13 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
             return new BigDecimal(Double.valueOf(value.toString()));
         if (value instanceof Timestamp)
             return new BigDecimal(((Timestamp) value).getTime());
-        return new BigDecimal(value.toString());
+        BigDecimal ret;
+        try {
+            ret = new BigDecimal(value.toString());
+        } catch (Exception e) {
+            ret = null;
+        }
+        return ret;
     }
 
     @Override
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/UtcTimestampUtil.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/UtcTimestampUtil.java
deleted file mode 100644
index 04a11a2beb00832a20d9d2d887a8ce5a68e5cf54..0000000000000000000000000000000000000000
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/UtcTimestampUtil.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package com.taosdata.jdbc.utils;
-
-import java.time.format.DateTimeFormatter;
-import java.time.format.DateTimeFormatterBuilder;
-
-public class UtcTimestampUtil {
-    public static final DateTimeFormatter formatter = new DateTimeFormatterBuilder()
-            .appendPattern("yyyy-MM-ddTHH:mm:ss.SSS+")
-//            .appendFraction(ChronoField.NANO_OF_SECOND, 0, 9, true)
-            .toFormatter();
-
-}
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/Utils.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/Utils.java
index 052f34858df634cc93a3a5b0eab26e8634e1858a..eeb936a1d0843c56e0de63a6c4b113fb644b778f 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/Utils.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/Utils.java
@@ -5,7 +5,15 @@ import com.google.common.collect.RangeSet;
 import com.google.common.collect.TreeRangeSet;
 
 import java.nio.charset.Charset;
+import java.sql.Date;
+import java.sql.Time;
 import java.sql.Timestamp;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.LocalTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeFormatterBuilder;
+import java.time.format.DateTimeParseException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.regex.Matcher;
@@ -17,6 +25,41 @@ public class Utils {
 
     private static Pattern ptn = Pattern.compile(".*?'");
 
+    private static final DateTimeFormatter formatter = new DateTimeFormatterBuilder()
+            .appendPattern("yyyy-MM-dd HH:mm:ss.SSS").toFormatter();
+    private static final DateTimeFormatter formatter2 = new DateTimeFormatterBuilder()
+            .appendPattern("yyyy-MM-dd HH:mm:ss.SSSSSS").toFormatter();
+
+    public static Time parseTime(String timestampStr) throws DateTimeParseException {
+        LocalTime time;
+        try {
+            time = LocalTime.parse(timestampStr, formatter);
+        } catch (DateTimeParseException e) {
+            time = LocalTime.parse(timestampStr, formatter2);
+        }
+        return Time.valueOf(time);
+    }
+
+    public static Date parseDate(String timestampStr) throws DateTimeParseException {
+        LocalDate date;
+        try {
+            date = LocalDate.parse(timestampStr, formatter);
+        } catch (DateTimeParseException e) {
+            date = LocalDate.parse(timestampStr, formatter2);
+        }
+        return Date.valueOf(date);
+    }
+
+    public static Timestamp parseTimestamp(String timeStampStr) {
+        LocalDateTime dateTime;
+        try {
+            dateTime = LocalDateTime.parse(timeStampStr, formatter);
+        } catch (DateTimeParseException e) {
+            dateTime = LocalDateTime.parse(timeStampStr, formatter2);
+        }
+        return Timestamp.valueOf(dateTime);
+    }
+
     public static String escapeSingleQuota(String origin) {
         Matcher m = ptn.matcher(origin);
         StringBuffer sb = new StringBuffer();
@@ -133,4 +176,13 @@ public class Utils {
         }).collect(Collectors.joining());
     }
 
+
+    public static String formatTimestamp(Timestamp timestamp) {
+        int nanos = timestamp.getNanos();
+        if (nanos % 1000000l != 0)
+            return timestamp.toLocalDateTime().format(formatter2);
+        return timestamp.toLocalDateTime().format(formatter);
+    }
+
+
 }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/InsertSpecialCharacterRestfulTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/InsertSpecialCharacterRestfulTest.java
index ea0d1aec41930da64ddf2dba7b6be093ecc0c03f..fa6cbd22b5da0869d4a74e90de12c952fecd22c7 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/InsertSpecialCharacterRestfulTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/InsertSpecialCharacterRestfulTest.java
@@ -7,7 +7,6 @@ import java.sql.*;
 public class InsertSpecialCharacterRestfulTest {
 
     private static final String host = "127.0.0.1";
-    //    private static final String host = "master";
     private static Connection conn;
     private static String dbName = "spec_char_test";
     private static String tbname1 = "test";
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TD4174Test.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TD4174Test.java
new file mode 100644
index 0000000000000000000000000000000000000000..2704d4cfa558ebdb6885c320d7ba775b36b99f09
--- /dev/null
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TD4174Test.java
@@ -0,0 +1,62 @@
+package com.taosdata.jdbc.cases;
+
+import com.alibaba.fastjson.JSONObject;
+import com.taosdata.jdbc.TSDBDriver;
+import org.junit.*;
+
+import java.sql.*;
+import java.util.Properties;
+
+public class TD4174Test {
+    private Connection conn;
+    private static final String host = "127.0.0.1";
+
+    @Test
+    public void test() {
+        long ts = System.currentTimeMillis();
+        try (PreparedStatement pstmt = conn.prepareStatement("insert into weather values(" + ts + ", ?)")) {
+            JSONObject value = new JSONObject();
+            value.put("name", "John Smith");
+            value.put("age", 20);
+            Assert.assertEquals("{\"name\":\"John Smith\",\"age\":20}",value.toJSONString());
+            pstmt.setString(1, value.toJSONString());
+
+            int ret = pstmt.executeUpdate();
+            Assert.assertEquals(1, ret);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void main(String[] args) {
+        JSONObject value = new JSONObject();
+        value.put("name", "John Smith");
+        value.put("age", 20);
+        System.out.println(value.toJSONString());
+    }
+
+    @Before
+    public void before() throws SQLException {
+        String url = "jdbc:TAOS://" + host + ":6030/?user=root&password=taosdata";
+        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(url, properties);
+        try (Statement stmt = conn.createStatement()) {
+            stmt.execute("drop database if exists td4174");
+            stmt.execute("create database if not exists td4174");
+            stmt.execute("use td4174");
+            stmt.execute("create table weather(ts timestamp, text binary(64))");
+        }
+    }
+
+    @After
+    public void after() throws SQLException {
+        if (conn != null)
+            conn.close();
+
+    }
+
+}
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TwoTypeTimestampPercisionInRestfulTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TwoTypeTimestampPercisionInRestfulTest.java
index ed4f979ef33354595bfeb707678e3b9797aba686..5c83b5a9da527a55387a8ad399e78462b6fab63c 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TwoTypeTimestampPercisionInRestfulTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TwoTypeTimestampPercisionInRestfulTest.java
@@ -13,6 +13,7 @@ import java.util.Properties;
 public class TwoTypeTimestampPercisionInRestfulTest {
 
     private static final String host = "127.0.0.1";
+
     private static final String ms_timestamp_db = "ms_precision_test";
     private static final String us_timestamp_db = "us_precision_test";
     private static final long timestamp1 = System.currentTimeMillis();
@@ -94,7 +95,8 @@ public class TwoTypeTimestampPercisionInRestfulTest {
         try (Statement stmt = conn3.createStatement()) {
             ResultSet rs = stmt.executeQuery("select last_row(ts) from " + ms_timestamp_db + ".weather");
             rs.next();
-            long ts = rs.getTimestamp(1).getTime();
+            Timestamp actual = rs.getTimestamp(1);
+            long ts = actual == null ? 0 : actual.getTime();
             Assert.assertEquals(timestamp1, ts);
             ts = rs.getLong(1);
             Assert.assertEquals(timestamp1, ts);
@@ -110,7 +112,7 @@ public class TwoTypeTimestampPercisionInRestfulTest {
             rs.next();
 
             Timestamp timestamp = rs.getTimestamp(1);
-            long ts = timestamp.getTime();
+            long ts = timestamp == null ? 0 : timestamp.getTime();
             Assert.assertEquals(timestamp1, ts);
             int nanos = timestamp.getNanos();
             Assert.assertEquals(timestamp2 % 1000_000l * 1000, nanos);
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/UnsignedNumberJniTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/UnsignedNumberJniTest.java
index d1816a3e7c84703e76a28e6b0e5db842de9c0ac4..fb23c0e64aa7469443d5476de47af305cfd3c09f 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/UnsignedNumberJniTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/UnsignedNumberJniTest.java
@@ -9,19 +9,19 @@ import java.util.Properties;
 
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
 public class UnsignedNumberJniTest {
+
     private static final String host = "127.0.0.1";
     private static Connection conn;
+    private static long ts;
 
     @Test
     public void testCase001() {
         try (Statement stmt = conn.createStatement()) {
             ResultSet rs = stmt.executeQuery("select * from us_table");
             ResultSetMetaData meta = rs.getMetaData();
+            assertResultSetMetaData(meta);
             while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    System.out.print(meta.getColumnLabel(i) + ": " + rs.getString(i) + "\t");
-                }
-                System.out.println();
+                Assert.assertEquals(ts, rs.getTimestamp(1).getTime());
                 Assert.assertEquals("127", rs.getString(2));
                 Assert.assertEquals("32767", rs.getString(3));
                 Assert.assertEquals("2147483647", rs.getString(4));
@@ -37,13 +37,10 @@ public class UnsignedNumberJniTest {
         try (Statement stmt = conn.createStatement()) {
             ResultSet rs = stmt.executeQuery("select * from us_table");
             ResultSetMetaData meta = rs.getMetaData();
+            assertResultSetMetaData(meta);
+
             while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
+                Assert.assertEquals(ts, rs.getTimestamp(1).getTime());
                 Assert.assertEquals(127, rs.getByte(2));
                 Assert.assertEquals(32767, rs.getShort(3));
                 Assert.assertEquals(2147483647, rs.getInt(4));
@@ -61,16 +58,14 @@ public class UnsignedNumberJniTest {
             stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 127, 32767,2147483647, 18446744073709551614)");
             ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
             ResultSetMetaData meta = rs.getMetaData();
+            assertResultSetMetaData(meta);
             while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
+                Assert.assertEquals(now, rs.getTimestamp(1).getTime());
                 Assert.assertEquals(127, rs.getByte(2));
                 Assert.assertEquals(32767, rs.getShort(3));
                 Assert.assertEquals(2147483647, rs.getInt(4));
+                Assert.assertEquals("18446744073709551614", rs.getString(5));
+                rs.getLong(5);
             }
         }
     }
@@ -82,15 +77,15 @@ public class UnsignedNumberJniTest {
             stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 127, 32767,4294967294, 18446744073709551614)");
             ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
             ResultSetMetaData meta = rs.getMetaData();
+            assertResultSetMetaData(meta);
+
             while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
+                Assert.assertEquals(now, rs.getTimestamp(1).getTime());
                 Assert.assertEquals(127, rs.getByte(2));
                 Assert.assertEquals(32767, rs.getShort(3));
+                Assert.assertEquals("4294967294", rs.getString(4));
+                Assert.assertEquals("18446744073709551614", rs.getString(5));
+                rs.getInt(4);
             }
         }
     }
@@ -102,15 +97,15 @@ public class UnsignedNumberJniTest {
             stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 127, 65534,4294967294, 18446744073709551614)");
             ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
             ResultSetMetaData meta = rs.getMetaData();
-            while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
+            assertResultSetMetaData(meta);
 
+            while (rs.next()) {
+                Assert.assertEquals(now, rs.getTimestamp(1).getTime());
                 Assert.assertEquals(127, rs.getByte(2));
+                Assert.assertEquals("65534", rs.getString(3));
+                Assert.assertEquals("4294967294", rs.getString(4));
+                Assert.assertEquals("18446744073709551614", rs.getString(5));
+                rs.getShort(3);
             }
         }
     }
@@ -122,37 +117,27 @@ public class UnsignedNumberJniTest {
             stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 254, 65534,4294967294, 18446744073709551614)");
             ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
             ResultSetMetaData meta = rs.getMetaData();
-            while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
-            }
-        }
-    }
+            assertResultSetMetaData(meta);
 
-    @Test
-    public void testCase007() throws SQLException {
-        try (Statement stmt = conn.createStatement()) {
-            long now = System.currentTimeMillis();
-            stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 254, 65534,4294967294, 18446744073709551614)");
-            ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
-            ResultSetMetaData meta = rs.getMetaData();
             while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    System.out.print(meta.getColumnLabel(i) + ": " + rs.getString(i) + "\t");
-                }
-                System.out.println();
+                Assert.assertEquals(now, rs.getTimestamp(1).getTime());
                 Assert.assertEquals("254", rs.getString(2));
                 Assert.assertEquals("65534", rs.getString(3));
                 Assert.assertEquals("4294967294", rs.getString(4));
                 Assert.assertEquals("18446744073709551614", rs.getString(5));
+                rs.getByte(2);
             }
         }
     }
 
+    private void assertResultSetMetaData(ResultSetMetaData meta) throws SQLException {
+        Assert.assertEquals(5, meta.getColumnCount());
+        Assert.assertEquals("ts", meta.getColumnLabel(1));
+        Assert.assertEquals("f1", meta.getColumnLabel(2));
+        Assert.assertEquals("f2", meta.getColumnLabel(3));
+        Assert.assertEquals("f3", meta.getColumnLabel(4));
+        Assert.assertEquals("f4", meta.getColumnLabel(5));
+    }
 
     @BeforeClass
     public static void beforeClass() {
@@ -160,20 +145,19 @@ public class UnsignedNumberJniTest {
         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");
+        ts = System.currentTimeMillis();
 
         try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
             final String url = "jdbc:TAOS://" + host + ":6030/?user=root&password=taosdata";
             conn = DriverManager.getConnection(url, properties);
-
             Statement stmt = conn.createStatement();
             stmt.execute("drop database if exists unsign_jni");
             stmt.execute("create database if not exists unsign_jni");
             stmt.execute("use unsign_jni");
             stmt.execute("create table us_table(ts timestamp, f1 tinyint unsigned, f2 smallint unsigned, f3 int unsigned, f4 bigint unsigned)");
-            stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(now, 127, 32767,2147483647, 9223372036854775807)");
+            stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + ts + ", 127, 32767,2147483647, 9223372036854775807)");
             stmt.close();
-        } catch (ClassNotFoundException | SQLException e) {
+        } catch (SQLException e) {
             e.printStackTrace();
         }
     }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/UnsignedNumberRestfulTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/UnsignedNumberRestfulTest.java
index 4ae2f36fe95a37eba27dd78222f3120f5cbfaf3a..a659a490cb557f3825deb4bb58d32941b47a62ab 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/UnsignedNumberRestfulTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/UnsignedNumberRestfulTest.java
@@ -13,17 +13,20 @@ public class UnsignedNumberRestfulTest {
 
     private static final String host = "127.0.0.1";
     private static Connection conn;
+    private static long ts;
 
     @Test
     public void testCase001() {
         try (Statement stmt = conn.createStatement()) {
             ResultSet rs = stmt.executeQuery("select * from us_table");
             ResultSetMetaData meta = rs.getMetaData();
+            assertResultSetMetaData(meta);
             while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    System.out.print(meta.getColumnLabel(i) + ": " + rs.getString(i) + "\t");
-                }
-                System.out.println();
+                Assert.assertEquals(ts, rs.getTimestamp(1).getTime());
+                Assert.assertEquals("127", rs.getString(2));
+                Assert.assertEquals("32767", rs.getString(3));
+                Assert.assertEquals("2147483647", rs.getString(4));
+                Assert.assertEquals("9223372036854775807", rs.getString(5));
             }
         } catch (SQLException e) {
             e.printStackTrace();
@@ -35,13 +38,14 @@ public class UnsignedNumberRestfulTest {
         try (Statement stmt = conn.createStatement()) {
             ResultSet rs = stmt.executeQuery("select * from us_table");
             ResultSetMetaData meta = rs.getMetaData();
+            assertResultSetMetaData(meta);
+
             while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
+                Assert.assertEquals(ts, rs.getTimestamp(1).getTime());
+                Assert.assertEquals(127, rs.getByte(2));
+                Assert.assertEquals(32767, rs.getShort(3));
+                Assert.assertEquals(2147483647, rs.getInt(4));
+                Assert.assertEquals(9223372036854775807l, rs.getLong(5));
             }
         } catch (SQLException e) {
             e.printStackTrace();
@@ -55,13 +59,14 @@ public class UnsignedNumberRestfulTest {
             stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 127, 32767,2147483647, 18446744073709551614)");
             ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
             ResultSetMetaData meta = rs.getMetaData();
+            assertResultSetMetaData(meta);
             while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
+                Assert.assertEquals(now, rs.getTimestamp(1).getTime());
+                Assert.assertEquals(127, rs.getByte(2));
+                Assert.assertEquals(32767, rs.getShort(3));
+                Assert.assertEquals(2147483647, rs.getInt(4));
+                Assert.assertEquals("18446744073709551614", rs.getString(5));
+                rs.getLong(5);
             }
         }
     }
@@ -73,13 +78,15 @@ public class UnsignedNumberRestfulTest {
             stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 127, 32767,4294967294, 18446744073709551614)");
             ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
             ResultSetMetaData meta = rs.getMetaData();
+            assertResultSetMetaData(meta);
+
             while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
+                Assert.assertEquals(now, rs.getTimestamp(1).getTime());
+                Assert.assertEquals(127, rs.getByte(2));
+                Assert.assertEquals(32767, rs.getShort(3));
+                Assert.assertEquals("4294967294", rs.getString(4));
+                Assert.assertEquals("18446744073709551614", rs.getString(5));
+                rs.getInt(4);
             }
         }
     }
@@ -91,13 +98,15 @@ public class UnsignedNumberRestfulTest {
             stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 127, 65534,4294967294, 18446744073709551614)");
             ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
             ResultSetMetaData meta = rs.getMetaData();
+            assertResultSetMetaData(meta);
+
             while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
+                Assert.assertEquals(now, rs.getTimestamp(1).getTime());
+                Assert.assertEquals(127, rs.getByte(2));
+                Assert.assertEquals("65534", rs.getString(3));
+                Assert.assertEquals("4294967294", rs.getString(4));
+                Assert.assertEquals("18446744073709551614", rs.getString(5));
+                rs.getShort(3);
             }
         }
     }
@@ -109,57 +118,47 @@ public class UnsignedNumberRestfulTest {
             stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 254, 65534,4294967294, 18446744073709551614)");
             ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
             ResultSetMetaData meta = rs.getMetaData();
-            while (rs.next()) {
-                System.out.print(meta.getColumnLabel(1) + ": " + rs.getTimestamp(1) + "\t");
-                System.out.print(meta.getColumnLabel(2) + ": " + rs.getByte(2) + "\t");
-                System.out.print(meta.getColumnLabel(3) + ": " + rs.getShort(3) + "\t");
-                System.out.print(meta.getColumnLabel(4) + ": " + rs.getInt(4) + "\t");
-                System.out.print(meta.getColumnLabel(5) + ": " + rs.getLong(5) + "\t");
-                System.out.println();
-            }
-        }
-    }
+            assertResultSetMetaData(meta);
 
-    @Test
-    public void testCase007() throws SQLException {
-        try (Statement stmt = conn.createStatement()) {
-            long now = System.currentTimeMillis();
-            stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + now + ", 254, 65534,4294967294, 18446744073709551614)");
-            ResultSet rs = stmt.executeQuery("select * from us_table where ts = " + now);
-            ResultSetMetaData meta = rs.getMetaData();
             while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    System.out.print(meta.getColumnLabel(i) + ": " + rs.getString(i) + "\t");
-                }
-                System.out.println();
+                Assert.assertEquals(now, rs.getTimestamp(1).getTime());
                 Assert.assertEquals("254", rs.getString(2));
                 Assert.assertEquals("65534", rs.getString(3));
                 Assert.assertEquals("4294967294", rs.getString(4));
                 Assert.assertEquals("18446744073709551614", rs.getString(5));
+                rs.getByte(2);
             }
         }
     }
 
+    private void assertResultSetMetaData(ResultSetMetaData meta) throws SQLException {
+        Assert.assertEquals(5, meta.getColumnCount());
+        Assert.assertEquals("ts", meta.getColumnLabel(1));
+        Assert.assertEquals("f1", meta.getColumnLabel(2));
+        Assert.assertEquals("f2", meta.getColumnLabel(3));
+        Assert.assertEquals("f3", meta.getColumnLabel(4));
+        Assert.assertEquals("f4", meta.getColumnLabel(5));
+    }
+
     @BeforeClass
     public static void beforeClass() {
         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");
+        ts = System.currentTimeMillis();
 
         try {
-            Class.forName("com.taosdata.jdbc.rs.RestfulDriver");
             final String url = "jdbc:TAOS-RS://" + host + ":6041/?user=root&password=taosdata";
             conn = DriverManager.getConnection(url, properties);
-
             Statement stmt = conn.createStatement();
             stmt.execute("drop database if exists unsign_restful");
             stmt.execute("create database if not exists unsign_restful");
             stmt.execute("use unsign_restful");
             stmt.execute("create table us_table(ts timestamp, f1 tinyint unsigned, f2 smallint unsigned, f3 int unsigned, f4 bigint unsigned)");
-            stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(now, 127, 32767,2147483647, 9223372036854775807)");
+            stmt.executeUpdate("insert into us_table(ts,f1,f2,f3,f4) values(" + ts + ", 127, 32767,2147483647, 9223372036854775807)");
             stmt.close();
-        } catch (ClassNotFoundException | SQLException e) {
+        } catch (SQLException e) {
             e.printStackTrace();
         }
     }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java
index e4dd6384f9cc2f22d6c9cbcd04ae9b0f67dc477b..ee457ff4127ccf3fe88cf277d581a3dcb3475df9 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java
@@ -10,7 +10,6 @@ import java.sql.*;
 
 public class RestfulPreparedStatementTest {
     private static final String host = "127.0.0.1";
-    //    private static final String host = "master";
     private static Connection conn;
     private static final String sql_insert = "insert into t1 values(?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
     private static PreparedStatement pstmt_insert;
@@ -371,7 +370,6 @@ public class RestfulPreparedStatementTest {
         pstmt_insert.setSQLXML(1, null);
     }
 
-
     @BeforeClass
     public static void beforeClass() {
         try {
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulResultSetTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulResultSetTest.java
index 9bfe9a04ffb33f1ecf9466b2aba85121da85e846..81e762c5ca9646875f21acd89f55bd939440cfd4 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulResultSetTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulResultSetTest.java
@@ -18,7 +18,6 @@ import java.text.SimpleDateFormat;
 public class RestfulResultSetTest {
 
     private static final String host = "127.0.0.1";
-
     private static Connection conn;
     private static Statement stmt;
     private static ResultSet rs;
@@ -95,7 +94,8 @@ public class RestfulResultSetTest {
     @Test
     public void getBigDecimal() throws SQLException {
         BigDecimal f1 = rs.getBigDecimal("f1");
-        Assert.assertEquals(1609430400000l, f1.longValue());
+        long actual = (f1 == null) ? 0 : f1.longValue();
+        Assert.assertEquals(1609430400000l, actual);
 
         BigDecimal f2 = rs.getBigDecimal("f2");
         Assert.assertEquals(1, f2.intValue());
@@ -119,7 +119,7 @@ public class RestfulResultSetTest {
     @Test
     public void getBytes() throws SQLException {
         byte[] f1 = rs.getBytes("f1");
-        Assert.assertEquals("2021-01-01 00:00:00.0", new String(f1));
+        Assert.assertEquals("2021-01-01 00:00:00.000", new String(f1));
 
         byte[] f2 = rs.getBytes("f2");
         Assert.assertEquals(1, Ints.fromByteArray(f2));
diff --git a/src/kit/taosdemo/taosdemo.c b/src/kit/taosdemo/taosdemo.c
index 1465cc527fa363c04233fd24795f7208a2fb67cc..3f1a63eed2552179cb7483f77dce1de63ce4b028 100644
--- a/src/kit/taosdemo/taosdemo.c
+++ b/src/kit/taosdemo/taosdemo.c
@@ -120,11 +120,18 @@ enum MODE {
   MODE_BUT
 };
 
-typedef enum enum_INSERT_MODE {
+enum enum_TAOS_INTERFACE {
+    TAOSC_IFACE,
+    REST_IFACE,
+    STMT_IFACE,
+    INTERFACE_BUT
+};
+
+typedef enum enum_PROGRESSIVE_OR_INTERLACE {
     PROGRESSIVE_INSERT_MODE,
     INTERLACE_INSERT_MODE,
     INVALID_INSERT_MODE
-} INSERT_MODE;
+} PROG_OR_INTERLACE_MODE;
 
 typedef enum enumQUERY_TYPE {
   NO_INSERT_TYPE,
@@ -188,6 +195,7 @@ typedef struct SArguments_S {
   uint32_t test_mode;
   char *   host;
   uint16_t port;
+  uint16_t iface;
   char *   user;
   char *   password;
   char *   database;
@@ -238,7 +246,7 @@ typedef struct SSuperTable_S {
   uint8_t      autoCreateTable;         // 0: create sub table, 1: auto create sub table
   char         childTblPrefix[MAX_TB_NAME_SIZE];
   char         dataSource[MAX_TB_NAME_SIZE+1];  // rand_gen or sample
-  char         insertMode[MAX_TB_NAME_SIZE];    // taosc, rest
+  uint16_t     insertMode;              // 0: taosc, 1: rest, 2: stmt
   int64_t      childTblLimit;
   uint64_t     childTblOffset;
 
@@ -405,6 +413,7 @@ typedef struct SQueryMetaInfo_S {
 
 typedef struct SThreadInfo_S {
   TAOS *    taos;
+  TAOS_STMT *stmt;
   int       threadID;
   char      db_name[MAX_DB_NAME_SIZE+1];
   uint32_t  time_precision;
@@ -418,6 +427,7 @@ typedef struct SThreadInfo_S {
   char*     cols;
   bool      use_metric;
   SSuperTable* superTblInfo;
+  char      *buffer;    // sql cmd buffer
 
   // for async insert
   tsem_t    lock_sem;
@@ -536,6 +546,7 @@ SArguments g_args = {
                      0,               // test_mode
                      "127.0.0.1",     // host
                      6030,            // port
+                     TAOSC_IFACE,     // iface
                      "root",          // user
                      #ifdef _TD_POWER_
                      "powerdb",      // password
@@ -652,6 +663,8 @@ static void printHelp() {
           "The host to connect to TDengine. Default is localhost.");
   printf("%s%s%s%s\n", indent, "-p", indent,
           "The TCP/IP port number to use for the connection. Default is 0.");
+  printf("%s%s%s%s\n", indent, "-I", indent,
+          "The interface (taosc, rest, and stmt) taosdemo uses. Default is 'taosc'.");
   printf("%s%s%s%s\n", indent, "-d", indent,
           "Destination database. Default is 'test'.");
   printf("%s%s%s%s\n", indent, "-a", indent,
@@ -740,6 +753,23 @@ static void parse_args(int argc, char *argv[], SArguments *arguments) {
         exit(EXIT_FAILURE);
       }
       arguments->port = atoi(argv[++i]);
+    } else if (strcmp(argv[i], "-I") == 0) {
+      if (argc == i+1) {
+        printHelp();
+        errorPrint("%s", "\n\t-I need a valid string following!\n");
+        exit(EXIT_FAILURE);
+      }
+      ++i;
+      if (0 == strcasecmp(argv[i], "taosc")) {
+          arguments->iface = TAOSC_IFACE;
+      } else if (0 == strcasecmp(argv[i], "rest")) {
+          arguments->iface = REST_IFACE;
+      } else if (0 == strcasecmp(argv[i], "stmt")) {
+          arguments->iface = STMT_IFACE;
+      } else {
+        errorPrint("%s", "\n\t-I need a valid string following!\n");
+        exit(EXIT_FAILURE);
+      }
     } else if (strcmp(argv[i], "-u") == 0) {
       if (argc == i+1) {
         printHelp();
@@ -997,7 +1027,8 @@ static void parse_args(int argc, char *argv[], SArguments *arguments) {
             arguments->port );
     printf("# User:                              %s\n", arguments->user);
     printf("# Password:                          %s\n", arguments->password);
-    printf("# Use metric:                        %s\n", arguments->use_metric ? "true" : "false");
+    printf("# Use metric:                        %s\n",
+            arguments->use_metric ? "true" : "false");
     if (*(arguments->datatype)) {
         printf("# Specified data type:               ");
         for (int i = 0; i < MAX_NUM_DATATYPE; i++)
@@ -1059,7 +1090,7 @@ static int queryDbExec(TAOS *taos, char *command, QUERY_TYPE type, bool quiet) {
   TAOS_RES *res = NULL;
   int32_t   code = -1;
 
-  for (i = 0; i < 5; i++) {
+  for (i = 0; i < 5 /* retry */; i++) {
     if (NULL != res) {
       taos_free_result(res);
       res = NULL;
@@ -1105,7 +1136,6 @@ static void appendResultBufToFile(char *resultBuf, char *resultFile)
     }
   }
 
-
   fprintf(fp, "%s", resultBuf);
   tmfclose(fp);
 }
@@ -1146,8 +1176,8 @@ static void appendResultToFile(TAOS_RES *res, char* resultFile) {
   free(databuf);
 }
 
-static void selectAndGetResult(threadInfo *pThreadInfo, char *command, char* resultFile)
-{
+static void selectAndGetResult(
+        threadInfo *pThreadInfo, char *command, char* resultFile) {
   if (0 == strncasecmp(g_queryInfo.queryMode, "taosc", strlen("taosc"))) {
     TAOS_RES *res = taos_query(pThreadInfo->taos, command);
     if (res == NULL || taos_errno(res) != 0) {
@@ -1291,6 +1321,8 @@ static void init_rand_data() {
 static int printfInsertMeta() {
     SHOW_PARSE_RESULT_START();
 
+  printf("interface:                  \033[33m%s\033[0m\n",
+          (g_args.iface==TAOSC_IFACE)?"taosc":(g_args.iface==REST_IFACE)?"rest":"stmt");
   printf("host:                       \033[33m%s:%u\033[0m\n", g_Dbs.host, g_Dbs.port);
   printf("user:                       \033[33m%s\033[0m\n", g_Dbs.user);
   printf("password:                   \033[33m%s\033[0m\n", g_Dbs.password);
@@ -1395,7 +1427,8 @@ static int printfInsertMeta() {
       printf("      dataSource:        \033[33m%s\033[0m\n",
               g_Dbs.db[i].superTbls[j].dataSource);
       printf("      insertMode:        \033[33m%s\033[0m\n",
-              g_Dbs.db[i].superTbls[j].insertMode);
+          (g_Dbs.db[i].superTbls[j].insertMode==TAOSC_IFACE)?"taosc":
+          (g_Dbs.db[i].superTbls[j].insertMode==REST_IFACE)?"rest":"stmt");
       if (g_Dbs.db[i].superTbls[j].childTblLimit > 0) {
         printf("      childTblLimit:     \033[33m%"PRId64"\033[0m\n",
                 g_Dbs.db[i].superTbls[j].childTblLimit);
@@ -1550,8 +1583,8 @@ static void printfInsertMetaToFile(FILE* fp) {
     }
 
     fprintf(fp, "  super table count:     %"PRIu64"\n", g_Dbs.db[i].superTblCount);
-    for (int j = 0; j < g_Dbs.db[i].superTblCount; j++) {
-      fprintf(fp, "  super table[%d]:\n", j);
+    for (uint64_t j = 0; j < g_Dbs.db[i].superTblCount; j++) {
+      fprintf(fp, "  super table[%"PRIu64"]:\n", j);
 
       fprintf(fp, "      stbName:           %s\n",  g_Dbs.db[i].superTbls[j].sTblName);
 
@@ -1578,7 +1611,8 @@ static void printfInsertMetaToFile(FILE* fp) {
       fprintf(fp, "      dataSource:        %s\n",
               g_Dbs.db[i].superTbls[j].dataSource);
       fprintf(fp, "      insertMode:        %s\n",
-              g_Dbs.db[i].superTbls[j].insertMode);
+          (g_Dbs.db[i].superTbls[j].insertMode==TAOSC_IFACE)?"taosc":
+          (g_Dbs.db[i].superTbls[j].insertMode==REST_IFACE)?"rest":"stmt");
       fprintf(fp, "      insertRows:        %"PRId64"\n",
               g_Dbs.db[i].superTbls[j].insertRows);
       fprintf(fp, "      interlace rows:    %"PRIu64"\n",
@@ -2749,7 +2783,7 @@ static int createDatabasesAndStables() {
 
     int validStbCount = 0;
 
-    for (int j = 0; j < g_Dbs.db[i].superTblCount; j++) {
+    for (uint64_t j = 0; j < g_Dbs.db[i].superTblCount; j++) {
       sprintf(command, "describe %s.%s;", g_Dbs.db[i].dbName,
               g_Dbs.db[i].superTbls[j].sTblName);
       verbosePrint("%s() %d command: %s\n", __func__, __LINE__, command);
@@ -2761,7 +2795,7 @@ static int createDatabasesAndStables() {
                 &g_Dbs.db[i].superTbls[j]);
 
         if (0 != ret) {
-          errorPrint("create super table %d failed!\n\n", j);
+          errorPrint("create super table %"PRIu64" failed!\n\n", j);
           continue;
         }
       }
@@ -2789,7 +2823,7 @@ static void* createTable(void *sarg)
   threadInfo *pThreadInfo = (threadInfo *)sarg;
   SSuperTable* superTblInfo = pThreadInfo->superTblInfo;
 
-  int64_t  lastPrintTime = taosGetTimestampMs();
+  uint64_t  lastPrintTime = taosGetTimestampMs();
 
   int buff_len;
   buff_len = BUFFER_SIZE / 8;
@@ -2864,7 +2898,7 @@ static void* createTable(void *sarg)
       return NULL;
     }
 
-    int64_t  currentPrintTime = taosGetTimestampMs();
+    uint64_t  currentPrintTime = taosGetTimestampMs();
     if (currentPrintTime - lastPrintTime > 30*1000) {
       printf("thread[%d] already create %"PRIu64" - %"PRIu64" tables\n",
               pThreadInfo->threadID, pThreadInfo->start_table_from, i);
@@ -2888,7 +2922,7 @@ static int startMultiThreadCreateChildTable(
         char* db_name, SSuperTable* superTblInfo) {
 
   pthread_t *pids = malloc(threads * sizeof(pthread_t));
-  threadInfo *infos = malloc(threads * sizeof(threadInfo));
+  threadInfo *infos = calloc(1, threads * sizeof(threadInfo));
 
   if ((NULL == pids) || (NULL == infos)) {
     printf("malloc failed\n");
@@ -2908,7 +2942,7 @@ static int startMultiThreadCreateChildTable(
   int64_t b = 0;
   b = ntables % threads;
 
-  for (int64_t i = 0; i < threads; i++) {
+  for (int i = 0; i < threads; i++) {
     threadInfo *t_info = infos + i;
     t_info->threadID = i;
     tstrncpy(t_info->db_name, db_name, MAX_DB_NAME_SIZE);
@@ -2961,7 +2995,7 @@ static void createChildTables() {
     if (g_Dbs.use_metric) {
       if (g_Dbs.db[i].superTblCount > 0) {
           // with super table
-        for (int j = 0; j < g_Dbs.db[i].superTblCount; j++) {
+        for (uint64_t j = 0; j < g_Dbs.db[i].superTblCount; j++) {
           if ((AUTO_CREATE_SUBTBL == g_Dbs.db[i].superTbls[j].autoCreateTable)
                 || (TBL_ALREADY_EXISTS == g_Dbs.db[i].superTbls[j].childTblExists)) {
             continue;
@@ -3082,10 +3116,12 @@ static int readTagFromCsvFileToMem(SSuperTable  * superTblInfo) {
   return 0;
 }
 
+#if 0
 int readSampleFromJsonFileToMem(SSuperTable  * superTblInfo) {
   // TODO
   return 0;
 }
+#endif
 
 /*
   Read 10000 lines at most. If more than 10000 lines, continue to read after using
@@ -3785,15 +3821,24 @@ static bool getMetaFromInsertJsonFile(cJSON* root) {
         goto PARSE_OVER;
       }
 
-      cJSON *insertMode = cJSON_GetObjectItem(stbInfo, "insert_mode"); // taosc , rest
+      cJSON *insertMode = cJSON_GetObjectItem(stbInfo, "insert_mode"); // taosc , rest, stmt
       if (insertMode && insertMode->type == cJSON_String
               && insertMode->valuestring != NULL) {
-        tstrncpy(g_Dbs.db[i].superTbls[j].insertMode,
-                insertMode->valuestring, MAX_DB_NAME_SIZE);
+        if (0 == strcasecmp(insertMode->valuestring, "taosc")) {
+            g_Dbs.db[i].superTbls[j].insertMode = TAOSC_IFACE;
+        } else if (0 == strcasecmp(insertMode->valuestring, "rest")) {
+            g_Dbs.db[i].superTbls[j].insertMode = REST_IFACE;
+        } else if (0 == strcasecmp(insertMode->valuestring, "stmt")) {
+            g_Dbs.db[i].superTbls[j].insertMode = STMT_IFACE;
+        } else {
+            errorPrint("%s() LN%d, failed to read json, insert_mode %s not recognized\n",
+                    __func__, __LINE__, insertMode->valuestring);
+            goto PARSE_OVER;
+        }
       } else if (!insertMode) {
-        tstrncpy(g_Dbs.db[i].superTbls[j].insertMode, "taosc", MAX_DB_NAME_SIZE);
+        g_Dbs.db[i].superTbls[j].insertMode = TAOSC_IFACE;
       } else {
-        printf("ERROR: failed to read json, insert_mode not found\n");
+        errorPrint("%s", "failed to read json, insert_mode not found\n");
         goto PARSE_OVER;
       }
 
@@ -4510,7 +4555,7 @@ static void prepareSampleData() {
 static void postFreeResource() {
   tmfclose(g_fpOfInsertResult);
   for (int i = 0; i < g_Dbs.dbCount; i++) {
-    for (int j = 0; j < g_Dbs.db[i].superTblCount; j++) {
+    for (uint64_t j = 0; j < g_Dbs.db[i].superTblCount; j++) {
       if (0 != g_Dbs.db[i].superTbls[j].colsOfCreateChildTable) {
         free(g_Dbs.db[i].superTbls[j].colsOfCreateChildTable);
         g_Dbs.db[i].superTbls[j].colsOfCreateChildTable = NULL;
@@ -4715,32 +4760,43 @@ static int prepareSampleDataForSTable(SSuperTable *superTblInfo) {
   return 0;
 }
 
-static int64_t execInsert(threadInfo *pThreadInfo, char *buffer, uint64_t k)
+static int64_t execInsert(threadInfo *pThreadInfo, uint64_t k)
 {
   int affectedRows;
   SSuperTable* superTblInfo = pThreadInfo->superTblInfo;
 
   verbosePrint("[%d] %s() LN%d %s\n", pThreadInfo->threadID,
-            __func__, __LINE__, buffer);
+            __func__, __LINE__, pThreadInfo->buffer);
   if (superTblInfo) {
-    if (0 == strncasecmp(superTblInfo->insertMode, "taosc", strlen("taosc"))) {
-      affectedRows = queryDbExec(pThreadInfo->taos, buffer, INSERT_TYPE, false);
-    } else if (0 == strncasecmp(superTblInfo->insertMode, "rest", strlen("rest"))) {
+    if (superTblInfo->insertMode == TAOSC_IFACE) {
+      affectedRows = queryDbExec(
+              pThreadInfo->taos,
+              pThreadInfo->buffer, INSERT_TYPE, false);
+    } else if (superTblInfo->insertMode == REST_IFACE) {
       if (0 != postProceSql(g_Dbs.host, &g_Dbs.serv_addr, g_Dbs.port,
-                  buffer, NULL /* not set result file */)) {
+                  pThreadInfo->buffer, NULL /* not set result file */)) {
         affectedRows = -1;
         printf("========restful return fail, threadID[%d]\n",
             pThreadInfo->threadID);
       } else {
         affectedRows = k;
       }
+    } else if (superTblInfo->insertMode == STMT_IFACE) {
+      debugPrint("%s() LN%d, stmt=%p", __func__, __LINE__, pThreadInfo->stmt);
+      if (0 != taos_stmt_execute(pThreadInfo->stmt)) {
+        errorPrint("%s() LN%d, failied to execute insert statement\n",
+                    __func__, __LINE__);
+        exit(-1);
+      }
+
+      affectedRows = k;
     } else {
-      errorPrint("%s() LN%d: unknown insert mode: %s\n",
+      errorPrint("%s() LN%d: unknown insert mode: %d\n",
         __func__, __LINE__, superTblInfo->insertMode);
       affectedRows = 0;
     }
   } else {
-    affectedRows = queryDbExec(pThreadInfo->taos, buffer, INSERT_TYPE, false);
+    affectedRows = queryDbExec(pThreadInfo->taos, pThreadInfo->buffer, INSERT_TYPE, false);
   }
 
   return affectedRows;
@@ -5086,20 +5142,17 @@ static void* syncWriteInterlace(threadInfo *pThreadInfo) {
   if (interlaceRows > g_args.num_of_RPR)
     interlaceRows = g_args.num_of_RPR;
 
-  int insertMode;
+  int progOrInterlace;
 
   if (interlaceRows > 0) {
-    insertMode = INTERLACE_INSERT_MODE;
+    progOrInterlace= INTERLACE_INSERT_MODE;
   } else {
-    insertMode = PROGRESSIVE_INSERT_MODE;
+    progOrInterlace = PROGRESSIVE_INSERT_MODE;
   }
 
-  // TODO: prompt tbl count multple interlace rows and batch
-  //
-
   uint64_t maxSqlLen = superTblInfo?superTblInfo->maxSqlLen:g_args.max_sql_len;
-  char* buffer = calloc(maxSqlLen, 1);
-  if (NULL == buffer) {
+  pThreadInfo->buffer = calloc(maxSqlLen, 1);
+  if (NULL == pThreadInfo->buffer) {
     errorPrint( "%s() LN%d, Failed to alloc %"PRIu64" Bytes, reason:%s\n",
               __func__, __LINE__, maxSqlLen, strerror(errno));
     return NULL;
@@ -5152,10 +5205,10 @@ static void* syncWriteInterlace(threadInfo *pThreadInfo) {
         flagSleep = false;
     }
     // generate data
-    memset(buffer, 0, maxSqlLen);
+    memset(pThreadInfo->buffer, 0, maxSqlLen);
     uint64_t remainderBufLen = maxSqlLen;
 
-    char *pstr = buffer;
+    char *pstr = pThreadInfo->buffer;
 
     int len = snprintf(pstr, nInsertBufLen + 1, "%s", strInsertInto);
     pstr += len;
@@ -5168,7 +5221,7 @@ static void* syncWriteInterlace(threadInfo *pThreadInfo) {
       if (0 == strlen(tableName)) {
         errorPrint("[%d] %s() LN%d, getTableName return null\n",
             pThreadInfo->threadID, __func__, __LINE__);
-        free(buffer);
+        free(pThreadInfo->buffer);
         return NULL;
       }
 
@@ -5200,7 +5253,7 @@ static void* syncWriteInterlace(threadInfo *pThreadInfo) {
                 pThreadInfo->threadID, __func__, __LINE__,
                 batchPerTbl, recOfBatch);
 
-      if (insertMode == INTERLACE_INSERT_MODE) {
+      if (progOrInterlace == INTERLACE_INSERT_MODE) {
           if (tableSeq == pThreadInfo->start_table_from + pThreadInfo->ntables) {
             // turn to first table
             tableSeq = pThreadInfo->start_table_from;
@@ -5234,7 +5287,7 @@ static void* syncWriteInterlace(threadInfo *pThreadInfo) {
               pThreadInfo->threadID, __func__, __LINE__, recOfBatch,
               pThreadInfo->totalInsertRows);
     verbosePrint("[%d] %s() LN%d, buffer=%s\n",
-           pThreadInfo->threadID, __func__, __LINE__, buffer);
+           pThreadInfo->threadID, __func__, __LINE__, pThreadInfo->buffer);
 
     startTs = taosGetTimestampMs();
 
@@ -5245,7 +5298,7 @@ static void* syncWriteInterlace(threadInfo *pThreadInfo) {
       errorPrint("%s\n", "\tPlease check if the batch or the buffer length is proper value!\n");
       goto free_of_interlace;
     }
-    int64_t affectedRows = execInsert(pThreadInfo, buffer, recOfBatch);
+    int64_t affectedRows = execInsert(pThreadInfo, recOfBatch);
 
     endTs = taosGetTimestampMs();
     uint64_t delay = endTs - startTs;
@@ -5263,7 +5316,7 @@ static void* syncWriteInterlace(threadInfo *pThreadInfo) {
     if (recOfBatch != affectedRows) {
         errorPrint("[%d] %s() LN%d execInsert insert %"PRIu64", affected rows: %"PRId64"\n%s\n",
                 pThreadInfo->threadID, __func__, __LINE__,
-                recOfBatch, affectedRows, buffer);
+                recOfBatch, affectedRows, pThreadInfo->buffer);
         goto free_of_interlace;
     }
 
@@ -5282,8 +5335,8 @@ static void* syncWriteInterlace(threadInfo *pThreadInfo) {
       et = taosGetTimestampMs();
 
       if (insert_interval > (et - st) ) {
-        int sleepTime = insert_interval - (et -st);
-        performancePrint("%s() LN%d sleep: %d ms for insert interval\n",
+        uint64_t sleepTime = insert_interval - (et -st);
+        performancePrint("%s() LN%d sleep: %"PRId64" ms for insert interval\n",
                     __func__, __LINE__, sleepTime);
         taosMsleep(sleepTime); // ms
         sleepTimeTotal += insert_interval;
@@ -5292,7 +5345,7 @@ static void* syncWriteInterlace(threadInfo *pThreadInfo) {
   }
 
 free_of_interlace:
-  tmfree(buffer);
+  tmfree(pThreadInfo->buffer);
   printStatPerThread(pThreadInfo);
   return NULL;
 }
@@ -5311,8 +5364,8 @@ static void* syncWriteProgressive(threadInfo *pThreadInfo) {
   SSuperTable* superTblInfo = pThreadInfo->superTblInfo;
   uint64_t maxSqlLen = superTblInfo?superTblInfo->maxSqlLen:g_args.max_sql_len;
 
-  char* buffer = calloc(maxSqlLen, 1);
-  if (NULL == buffer) {
+  pThreadInfo->buffer = calloc(maxSqlLen, 1);
+  if (NULL == pThreadInfo->buffer) {
     errorPrint( "Failed to alloc %"PRIu64" Bytes, reason:%s\n",
               maxSqlLen,
               strerror(errno));
@@ -5358,7 +5411,7 @@ static void* syncWriteProgressive(threadInfo *pThreadInfo) {
              pThreadInfo->threadID, tableSeq, tableName);
 
       int64_t remainderBufLen = maxSqlLen;
-      char *pstr = buffer;
+      char *pstr = pThreadInfo->buffer;
       int nInsertBufLen = strlen("insert into ");
 
       int len = snprintf(pstr, nInsertBufLen + 1, "%s", "insert into ");
@@ -5381,7 +5434,7 @@ static void* syncWriteProgressive(threadInfo *pThreadInfo) {
 
       startTs = taosGetTimestampMs();
 
-      int64_t affectedRows = execInsert(pThreadInfo, buffer, generated);
+      int64_t affectedRows = execInsert(pThreadInfo, generated);
 
       endTs = taosGetTimestampMs();
       uint64_t delay = endTs - startTs;
@@ -5440,7 +5493,7 @@ static void* syncWriteProgressive(threadInfo *pThreadInfo) {
   } // tableSeq
 
 free_of_progressive:
-  tmfree(buffer);
+  tmfree(pThreadInfo->buffer);
   printStatPerThread(pThreadInfo);
   return NULL;
 }
@@ -5579,15 +5632,6 @@ static int convertHostToServAddr(char *host, uint16_t port, struct sockaddr_in *
 static void startMultiThreadInsertData(int threads, char* db_name,
         char* precision,SSuperTable* superTblInfo) {
 
-  pthread_t *pids = malloc(threads * sizeof(pthread_t));
-  assert(pids != NULL);
-
-  threadInfo *infos = malloc(threads * sizeof(threadInfo));
-  assert(infos != NULL);
-
-  memset(pids, 0, threads * sizeof(pthread_t));
-  memset(infos, 0, threads * sizeof(threadInfo));
-
   //TAOS* taos;
   //if (0 == strncasecmp(superTblInfo->insertMode, "taosc", 5)) {
   //  taos = taos_connect(g_Dbs.host, g_Dbs.user, g_Dbs.password, db_name, g_Dbs.port);
@@ -5648,10 +5692,10 @@ static void startMultiThreadInsertData(int threads, char* db_name,
     }
   }
 
-  TAOS* taos = taos_connect(
+  TAOS* taos0 = taos_connect(
               g_Dbs.host, g_Dbs.user,
               g_Dbs.password, db_name, g_Dbs.port);
-  if (NULL == taos) {
+  if (NULL == taos0) {
     errorPrint("%s() LN%d, connect to server fail , reason: %s\n",
                 __func__, __LINE__, taos_errstr(NULL));
     exit(-1);
@@ -5710,13 +5754,13 @@ static void startMultiThreadInsertData(int threads, char* db_name,
         limit * TSDB_TABLE_NAME_LEN);
     if (superTblInfo->childTblName == NULL) {
       errorPrint("%s() LN%d, alloc memory failed!\n", __func__, __LINE__);
-      taos_close(taos);
+      taos_close(taos0);
       exit(-1);
     }
 
     int64_t childTblCount;
     getChildNameOfSuperTableWithLimitAndOffset(
-        taos,
+        taos0,
         db_name, superTblInfo->sTblName,
         &superTblInfo->childTblName, &childTblCount,
         limit,
@@ -5726,7 +5770,7 @@ static void startMultiThreadInsertData(int threads, char* db_name,
     startFrom = 0;
   }
 
-  taos_close(taos);
+  taos_close(taos0);
 
   int64_t a = ntables / threads;
   if (a < 1) {
@@ -5740,11 +5784,21 @@ static void startMultiThreadInsertData(int threads, char* db_name,
   }
 
   if ((superTblInfo)
-      && (0 == strncasecmp(superTblInfo->insertMode, "rest", strlen("rest")))) {
-    if (convertHostToServAddr(g_Dbs.host, g_Dbs.port, &(g_Dbs.serv_addr)) != 0)
-      exit(-1);
+      && (superTblInfo->insertMode == REST_IFACE)) {
+      if (convertHostToServAddr(g_Dbs.host, g_Dbs.port, &(g_Dbs.serv_addr)) != 0) {
+        exit(-1);
+      }
   }
 
+  pthread_t *pids = malloc(threads * sizeof(pthread_t));
+  assert(pids != NULL);
+
+  threadInfo *infos = calloc(1, threads * sizeof(threadInfo));
+  assert(infos != NULL);
+
+  memset(pids, 0, threads * sizeof(pthread_t));
+  memset(infos, 0, threads * sizeof(threadInfo));
+
   for (int i = 0; i < threads; i++) {
     threadInfo *t_info = infos + i;
     t_info->threadID = i;
@@ -5756,17 +5810,32 @@ static void startMultiThreadInsertData(int threads, char* db_name,
     t_info->minDelay = UINT64_MAX;
 
     if ((NULL == superTblInfo) ||
-            (0 == strncasecmp(superTblInfo->insertMode, "taosc", 5))) {
+            (superTblInfo->insertMode != REST_IFACE)) {
       //t_info->taos = taos;
       t_info->taos = taos_connect(
               g_Dbs.host, g_Dbs.user,
               g_Dbs.password, db_name, g_Dbs.port);
       if (NULL == t_info->taos) {
         errorPrint(
-                "connect to server fail from insert sub thread, reason: %s\n",
+                "%s() LN%d, connect to server fail from insert sub thread, reason: %s\n",
+                __func__, __LINE__,
                 taos_errstr(NULL));
+        free(infos);
         exit(-1);
       }
+
+      if ((superTblInfo) && (superTblInfo->insertMode == STMT_IFACE)) {
+        t_info->stmt = taos_stmt_init(t_info->taos);
+        if (NULL == t_info->stmt) {
+            errorPrint(
+                "%s() LN%d, failed init stmt, reason: %s\n",
+                __func__, __LINE__,
+                taos_errstr(NULL));
+            free(pids);
+            free(infos);
+            exit(-1);
+        }
+      }
     } else {
       t_info->taos = NULL;
     }
@@ -5806,6 +5875,10 @@ static void startMultiThreadInsertData(int threads, char* db_name,
     threadInfo *t_info = infos + i;
 
     tsem_destroy(&(t_info->lock_sem));
+
+    if (t_info->stmt) {
+      taos_stmt_close(t_info->stmt);
+    }
     taos_close(t_info->taos);
 
     debugPrint("%s() LN%d, [%d] totalInsert=%"PRIu64" totalAffected=%"PRIu64"\n",
@@ -6083,7 +6156,7 @@ static int insertTestProcess() {
   for (int i = 0; i < g_Dbs.dbCount; i++) {
     if (g_Dbs.use_metric) {
       if (g_Dbs.db[i].superTblCount > 0) {
-        for (int j = 0; j < g_Dbs.db[i].superTblCount; j++) {
+        for (uint64_t j = 0; j < g_Dbs.db[i].superTblCount; j++) {
 
           SSuperTable* superTblInfo = &g_Dbs.db[i].superTbls[j];
 
@@ -6878,7 +6951,7 @@ static void setParaFromArg(){
     tstrncpy(g_Dbs.db[0].superTbls[0].childTblPrefix,
             g_args.tb_prefix, MAX_TB_NAME_SIZE);
     tstrncpy(g_Dbs.db[0].superTbls[0].dataSource, "rand", MAX_TB_NAME_SIZE);
-    tstrncpy(g_Dbs.db[0].superTbls[0].insertMode, "taosc", MAX_TB_NAME_SIZE);
+    g_Dbs.db[0].superTbls[0].insertMode = g_args.iface;
     tstrncpy(g_Dbs.db[0].superTbls[0].startTimestamp,
             "2017-07-14 10:40:00.000", MAX_TB_NAME_SIZE);
     g_Dbs.db[0].superTbls[0].timeStampStep = DEFAULT_TIMESTAMP_STEP;
diff --git a/src/mnode/src/mnodeProfile.c b/src/mnode/src/mnodeProfile.c
index 459d981138f05fde00c11f71e0b75048f2fc360d..cbf713af6514ce305d91e7edc6710ba0d51eeeec 100644
--- a/src/mnode/src/mnodeProfile.c
+++ b/src/mnode/src/mnodeProfile.c
@@ -123,8 +123,9 @@ SConnObj *mnodeAccquireConn(int32_t connId, char *user, uint32_t ip, uint16_t po
   if (/* pConn->ip != ip || */ pConn->port != port /* || strcmp(pConn->user, user) != 0 */) {
     mDebug("connId:%d, incoming conn user:%s ip:%s:%u, not match exist conn user:%s ip:%s:%u", connId, user,
            taosIpStr(ip), port, pConn->user, taosIpStr(pConn->ip), pConn->port);
-    taosCacheRelease(tsMnodeConnCache, (void **)&pConn, false);
-    return NULL;
+    pConn->port = port;
+    //taosCacheRelease(tsMnodeConnCache, (void **)&pConn, false);
+    //return NULL;
   }
 
   // mDebug("connId:%d, is incoming, user:%s ip:%s:%u", connId, pConn->user, taosIpStr(pConn->ip), pConn->port);
diff --git a/src/mnode/src/mnodeShow.c b/src/mnode/src/mnodeShow.c
index c0fa6368f302387a4cec841215761063be7415d8..5fe22826b7d0a2270300bacc3d1ae8f59d346a54 100644
--- a/src/mnode/src/mnodeShow.c
+++ b/src/mnode/src/mnodeShow.c
@@ -253,10 +253,6 @@ static int32_t mnodeProcessHeartBeatMsg(SMnodeMsg *pMsg) {
     
   int32_t connId = htonl(pHBMsg->connId);
   SConnObj *pConn = mnodeAccquireConn(connId, connInfo.user, connInfo.clientIp, connInfo.clientPort);
-  if (pConn == NULL) {
-    pHBMsg->pid = htonl(pHBMsg->pid);
-    pConn = mnodeCreateConn(connInfo.user, connInfo.clientIp, connInfo.clientPort, pHBMsg->pid, pHBMsg->appName);
-  }
 
   if (pConn == NULL) {
     // do not close existing links, otherwise
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index feaa205c3ef49d988049d7b0253a8ad62facb970..40759c93c4f62721c2ba81d5c5eaed40492de328 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -115,6 +115,8 @@ int64_t genQueryId(void) {
 
   uid |= sid;
 
+  qDebug("gen qid:0x%"PRIx64, uid);
+
   return uid;
 }
 
diff --git a/src/rpc/src/rpcMain.c b/src/rpc/src/rpcMain.c
index 08e7551a2e8fe72a24825362c17cf413509de9c3..605f7d2a326f9b2a66865d9ad0edc2987eb57f81 100644
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@@ -1471,7 +1471,7 @@ static int32_t rpcCompressRpcMsg(char* pCont, int32_t contLen) {
    * only the compressed size is less than the value of contLen - overhead, the compression is applied
    * The first four bytes is set to 0, the second four bytes are utilized to keep the original length of message
    */
-  if (compLen < contLen - overhead) {
+  if (compLen > 0 && compLen < contLen - overhead) {
     SRpcComp *pComp = (SRpcComp *)pCont;
     pComp->reserved = 0; 
     pComp->contLen = htonl(contLen); 
diff --git a/src/wal/src/walWrite.c b/src/wal/src/walWrite.c
index 0981d7a996f97990da42c14ddc11c93171007ede..f865870d478882df64bd2308b87f448c4602c847 100644
--- a/src/wal/src/walWrite.c
+++ b/src/wal/src/walWrite.c
@@ -426,8 +426,8 @@ static int32_t walRestoreWalFile(SWal *pWal, void *pVnode, FWalWrite writeFp, ch
 #endif
     offset = offset + sizeof(SWalHead) + pHead->len;
 
-    wTrace("vgId:%d, restore wal, fileId:%" PRId64 " hver:%" PRIu64 " wver:%" PRIu64 " len:%d", pWal->vgId,
-           fileId, pHead->version, pWal->version, pHead->len);
+    wTrace("vgId:%d, restore wal, fileId:%" PRId64 " hver:%" PRIu64 " wver:%" PRIu64 " len:%d offset:%" PRId64,
+           pWal->vgId, fileId, pHead->version, pWal->version, pHead->len, offset);
 
     pWal->version = pHead->version;
     (*writeFp)(pVnode, pHead, TAOS_QTYPE_WAL, NULL);