diff --git a/src/client/src/tscPrepare.c b/src/client/src/tscPrepare.c
index f199a5798779523e90e95bfce468a68b8afb6c6d..00d8b60e2f976603c3cc823c478b4698523be0fe 100644
--- a/src/client/src/tscPrepare.c
+++ b/src/client/src/tscPrepare.c
@@ -163,8 +163,8 @@ static int normalStmtBindParam(STscStmt* stmt, TAOS_BIND* bind) {
         break;
 
       default:
-        tscDebug("0x%"PRIx64" bind column%d: type mismatch or invalid", stmt->pSql->self, i);
-        return TSDB_CODE_TSC_INVALID_VALUE;
+        tscError("0x%"PRIx64" bind column%d: type mismatch or invalid", stmt->pSql->self, i);
+        return invalidOperationMsg(tscGetErrorMsgPayload(&stmt->pSql->cmd), "bind type mismatch or invalid");
     }
   }
 
@@ -727,6 +727,7 @@ static int doBindParam(STableDataBlocks* pBlock, char* data, SParamInfo* param,
 #endif
 
   if (bind->buffer_type != param->type) {
+    tscError("column type mismatch");
     return TSDB_CODE_TSC_INVALID_VALUE;
   }
 
@@ -754,6 +755,7 @@ static int doBindParam(STableDataBlocks* pBlock, char* data, SParamInfo* param,
 
     case TSDB_DATA_TYPE_BINARY:
       if ((*bind->length) > (uintptr_t)param->bytes) {
+        tscError("column length is too big");
         return TSDB_CODE_TSC_INVALID_VALUE;
       }
       size = (short)*bind->length;
@@ -763,6 +765,7 @@ static int doBindParam(STableDataBlocks* pBlock, char* data, SParamInfo* param,
     case TSDB_DATA_TYPE_NCHAR: {
       int32_t output = 0;
       if (!taosMbsToUcs4(bind->buffer, *bind->length, varDataVal(data + param->offset), param->bytes - VARSTR_HEADER_SIZE, &output)) {
+        tscError("convert nchar failed");
         return TSDB_CODE_TSC_INVALID_VALUE;
       }
       varDataSetLen(data + param->offset, output);
@@ -787,6 +790,7 @@ static int doBindParam(STableDataBlocks* pBlock, char* data, SParamInfo* param,
 
 static int doBindBatchParam(STableDataBlocks* pBlock, SParamInfo* param, TAOS_MULTI_BIND* bind, int32_t rowNum) {
   if (bind->buffer_type != param->type || !isValidDataType(param->type)) {
+    tscError("column mismatch or invalid");
     return TSDB_CODE_TSC_INVALID_VALUE;
   }
 
@@ -892,8 +896,8 @@ static int insertStmtBindParam(STscStmt* stmt, TAOS_BIND* bind) {
 
     int code = doBindParam(pBlock, data, param, &bind[param->idx], 1);
     if (code != TSDB_CODE_SUCCESS) {
-      tscDebug("0x%"PRIx64" bind column %d: type mismatch or invalid", pStmt->pSql->self, param->idx);
-      return code;
+      tscDebug("0x%"PRIx64" bind column %d: type mismatch or invalid", pStmt->pSql->self, param->idx);      
+      return invalidOperationMsg(tscGetErrorMsgPayload(&stmt->pSql->cmd), "bind column type mismatch or invalid");
     }
   }
 
@@ -957,13 +961,13 @@ static int insertStmtBindParamBatch(STscStmt* stmt, TAOS_MULTI_BIND* bind, int c
       SParamInfo* param = &pBlock->params[j];
       if (bind[param->idx].num != rowNum) {
         tscError("0x%"PRIx64" param %d: num[%d:%d] not match", pStmt->pSql->self, param->idx, rowNum, bind[param->idx].num);
-        return TSDB_CODE_TSC_INVALID_VALUE;
+        return invalidOperationMsg(tscGetErrorMsgPayload(&stmt->pSql->cmd), "bind row num mismatch");
       }
 
       int code = doBindBatchParam(pBlock, param, &bind[param->idx], pCmd->batchSize);
       if (code != TSDB_CODE_SUCCESS) {
         tscError("0x%"PRIx64" bind column %d: type mismatch or invalid", pStmt->pSql->self, param->idx);
-        return code;
+        return invalidOperationMsg(tscGetErrorMsgPayload(&stmt->pSql->cmd), "bind column type mismatch or invalid");
       }
     }
 
@@ -974,7 +978,7 @@ static int insertStmtBindParamBatch(STscStmt* stmt, TAOS_MULTI_BIND* bind, int c
     int code = doBindBatchParam(pBlock, param, bind, pCmd->batchSize);
     if (code != TSDB_CODE_SUCCESS) {
       tscError("0x%"PRIx64" bind column %d: type mismatch or invalid", pStmt->pSql->self, param->idx);
-      return code;
+      return invalidOperationMsg(tscGetErrorMsgPayload(&stmt->pSql->cmd), "bind column type mismatch or invalid");
     }
 
     if (colIdx == (pBlock->numOfParams - 1)) {
@@ -993,7 +997,7 @@ static int insertStmtUpdateBatch(STscStmt* stmt) {
 
   if (pCmd->batchSize > INT16_MAX) {
     tscError("too many record:%d", pCmd->batchSize);
-    return TSDB_CODE_TSC_APP_ERROR;
+    return invalidOperationMsg(tscGetErrorMsgPayload(&stmt->pSql->cmd), "too many records");
   }
 
   if (taosHashGetSize(pCmd->insertParam.pTableBlockHashList) == 0) {
@@ -1057,7 +1061,8 @@ static int insertStmtReset(STscStmt* pStmt) {
 static int insertStmtExecute(STscStmt* stmt) {
   SSqlCmd* pCmd = &stmt->pSql->cmd;
   if (pCmd->batchSize == 0) {
-    return TSDB_CODE_TSC_INVALID_VALUE;
+    tscError("no records bind");
+    return invalidOperationMsg(tscGetErrorMsgPayload(&stmt->pSql->cmd), "no records bind");
   }
 
   if (taosHashGetSize(pCmd->insertParam.pTableBlockHashList) == 0) {
@@ -1174,7 +1179,7 @@ static int insertBatchStmtExecute(STscStmt* pStmt) {
 
   if(pStmt->mtb.nameSet == false) {
     tscError("0x%"PRIx64" no table name set", pStmt->pSql->self);
-    return TSDB_CODE_TSC_APP_ERROR;
+    return invalidOperationMsg(tscGetErrorMsgPayload(&pStmt->pSql->cmd), "no table name set");
   }
 
   pStmt->pSql->retry = pStmt->pSql->maxRetry + 1;  //no retry
@@ -1215,7 +1220,8 @@ int stmtParseInsertTbTags(SSqlObj* pSql, STscStmt* pStmt) {
   int32_t index = 0;
   SStrToken sToken = tStrGetToken(pCmd->insertParam.sql, &index, false);
   if (sToken.n == 0) {
-    return TSDB_CODE_TSC_INVALID_OPERATION;
+    tscError("table is is expected, sql:%s", pCmd->insertParam.sql);
+    return tscSQLSyntaxErrMsg(pCmd->payload, "table name is expected", pCmd->insertParam.sql);
   }
 
   if (sToken.n == 1 && sToken.type == TK_QUESTION) {
@@ -1237,24 +1243,28 @@ int stmtParseInsertTbTags(SSqlObj* pSql, STscStmt* pStmt) {
       return TSDB_CODE_SUCCESS;
     }
 
-    if (sToken.n <= 0 || sToken.type != TK_USING) {
-      return tscSQLSyntaxErrMsg(pCmd->payload, "keywords USING is expected", sToken.z);
+    if (sToken.n <= 0 || sToken.type != TK_USING) {      
+      tscError("keywords USING is expected, sql:%s", pCmd->insertParam.sql);
+      return tscSQLSyntaxErrMsg(pCmd->payload, "keywords USING is expected", sToken.z ? sToken.z : pCmd->insertParam.sql);
     }
 
     sToken = tStrGetToken(pCmd->insertParam.sql, &index, false);
     if (sToken.n <= 0 || ((sToken.type != TK_ID) && (sToken.type != TK_STRING))) {
-      return tscSQLSyntaxErrMsg(pCmd->payload, "invalid token", sToken.z);
+      tscError("invalid token, sql:%s", pCmd->insertParam.sql);
+      return tscSQLSyntaxErrMsg(pCmd->payload, "invalid token", sToken.z ? sToken.z : pCmd->insertParam.sql);
     }
     pStmt->mtb.stbname = sToken;
 
     sToken = tStrGetToken(pCmd->insertParam.sql, &index, false);
     if (sToken.n <= 0 || sToken.type != TK_TAGS) {
-      return tscSQLSyntaxErrMsg(pCmd->payload, "keyword TAGS expected", sToken.z);
+      tscError("keyword TAGS expected, sql:%s", pCmd->insertParam.sql);
+      return tscSQLSyntaxErrMsg(pCmd->payload, "keyword TAGS expected", sToken.z ? sToken.z : pCmd->insertParam.sql);
     }
 
     sToken = tStrGetToken(pCmd->insertParam.sql, &index, false);
     if (sToken.n <= 0 || sToken.type != TK_LP) {
-      return tscSQLSyntaxErrMsg(pCmd->payload, ") expected", sToken.z);
+      tscError("( expected, sql:%s", pCmd->insertParam.sql);
+      return tscSQLSyntaxErrMsg(pCmd->payload, "( expected", sToken.z ? sToken.z : pCmd->insertParam.sql);
     }
 
     pStmt->mtb.tags = taosArrayInit(4, sizeof(SStrToken));
@@ -1264,7 +1274,8 @@ int stmtParseInsertTbTags(SSqlObj* pSql, STscStmt* pStmt) {
     while (loopCont) {
       sToken = tStrGetToken(pCmd->insertParam.sql, &index, false);
       if (sToken.n <= 0) {
-        return TSDB_CODE_TSC_INVALID_OPERATION;
+        tscError("unexpected sql end, sql:%s", pCmd->insertParam.sql);
+        return tscSQLSyntaxErrMsg(pCmd->payload, "unexpected sql end", pCmd->insertParam.sql);
       }
 
       switch (sToken.type) {
@@ -1272,7 +1283,8 @@ int stmtParseInsertTbTags(SSqlObj* pSql, STscStmt* pStmt) {
           loopCont = 0;
           break;
         case TK_VALUES:
-          return TSDB_CODE_TSC_INVALID_OPERATION;
+          tscError("unexpected token values, sql:%s", pCmd->insertParam.sql);
+          return tscSQLSyntaxErrMsg(pCmd->payload, "unexpected token", sToken.z);
         case TK_QUESTION:
           pStmt->mtb.tagSet = false; //continue
         default:
@@ -1282,12 +1294,14 @@ int stmtParseInsertTbTags(SSqlObj* pSql, STscStmt* pStmt) {
     }
 
     if (taosArrayGetSize(pStmt->mtb.tags) <= 0) {
-      return TSDB_CODE_TSC_INVALID_OPERATION;
+      tscError("no tags, sql:%s", pCmd->insertParam.sql);
+      return tscSQLSyntaxErrMsg(pCmd->payload, "no tags", pCmd->insertParam.sql);
     }
 
     sToken = tStrGetToken(pCmd->insertParam.sql, &index, false);
     if (sToken.n <= 0 || (sToken.type != TK_VALUES && sToken.type != TK_LP)) {
-      return TSDB_CODE_TSC_INVALID_OPERATION;
+      tscError("sql error, sql:%s", pCmd->insertParam.sql);
+      return tscSQLSyntaxErrMsg(pCmd->payload, "sql error", sToken.z ? sToken.z : pCmd->insertParam.sql);
     }
 
     pStmt->mtb.values = sToken;
@@ -1329,8 +1343,8 @@ int stmtGenInsertStatement(SSqlObj* pSql, STscStmt* pStmt, const char* name, TAO
         } else {
           if (tags[j].buffer == NULL) {
             free(str);
-            tscError("empty");
-            return TSDB_CODE_TSC_APP_ERROR;
+            tscError("empty tag value in params");
+            return invalidOperationMsg(tscGetErrorMsgPayload(&pStmt->pSql->cmd), "empty tag value in params");
           }
 
           ret = converToStr(str + len, tags[j].buffer_type, tags[j].buffer, tags[j].length ? (int32_t)*tags[j].length : -1, &l);
@@ -1410,6 +1424,11 @@ TAOS_STMT* taos_stmt_init(TAOS* taos) {
     return NULL;
   }
 
+  if (TSDB_CODE_SUCCESS != tscAllocPayload(&pSql->cmd, TSDB_DEFAULT_PAYLOAD_SIZE)) {
+    tscError("%p failed to malloc payload buffer", pSql);
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+
   tsem_init(&pSql->rspSem, 0, 0);
   pSql->signature = pSql;
   pSql->pTscObj   = pObj;
@@ -1431,7 +1450,7 @@ int taos_stmt_prepare(TAOS_STMT* stmt, const char* sql, unsigned long length) {
 
   if (pStmt->last != STMT_INIT) {
     tscError("prepare status error, last:%d", pStmt->last);
-    return TSDB_CODE_TSC_APP_ERROR;
+    return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), "prepare status error");
   }
 
   pStmt->last = STMT_PREPARE;
@@ -1447,11 +1466,6 @@ int taos_stmt_prepare(TAOS_STMT* stmt, const char* sql, unsigned long length) {
   
   pCmd->insertParam.insertType = TSDB_QUERY_TYPE_STMT_INSERT;
 
-  if (TSDB_CODE_SUCCESS != tscAllocPayload(pCmd, TSDB_DEFAULT_PAYLOAD_SIZE)) {
-    tscError("%p failed to malloc payload buffer", pSql);
-    return TSDB_CODE_TSC_OUT_OF_MEMORY;
-  }
-
   pSql->sqlstr = realloc(pSql->sqlstr, sqlLen + 1);
 
   if (pSql->sqlstr == NULL) {
@@ -1489,6 +1503,7 @@ int taos_stmt_prepare(TAOS_STMT* stmt, const char* sql, unsigned long length) {
     if (code == TSDB_CODE_TSC_ACTION_IN_PROGRESS) {
       // wait for the callback function to post the semaphore
       tsem_wait(&pSql->rspSem);
+      pSql->res.code = code;
       return pSql->res.code;
     }
 
@@ -1510,20 +1525,18 @@ int taos_stmt_set_tbname_tags(TAOS_STMT* stmt, const char* name, TAOS_BIND* tags
   }
 
   if (name == NULL) {
-    terrno = TSDB_CODE_TSC_APP_ERROR;
     tscError("0x%"PRIx64" name is NULL", pSql->self);
-    return TSDB_CODE_TSC_APP_ERROR;
+    return invalidOperationMsg(tscGetErrorMsgPayload(&pStmt->pSql->cmd), "name is NULL");
   }
 
   if (pStmt->multiTbInsert == false || !tscIsInsertData(pSql->sqlstr)) {
-    terrno = TSDB_CODE_TSC_APP_ERROR;
-    tscError("0x%"PRIx64" not multi table insert", pSql->self);
-    return TSDB_CODE_TSC_APP_ERROR;
+    tscError("0x%"PRIx64" not multiple table insert", pSql->self);
+    return invalidOperationMsg(tscGetErrorMsgPayload(&pStmt->pSql->cmd), "not multiple table insert");
   }
 
   if (pStmt->last == STMT_INIT || pStmt->last == STMT_BIND || pStmt->last == STMT_BIND_COL) {
-    tscError("0x%"PRIx64" settbname status error, last:%d", pSql->self, pStmt->last);
-    return TSDB_CODE_TSC_APP_ERROR;
+    tscError("0x%"PRIx64" set_tbname_tags status error, last:%d", pSql->self, pStmt->last);
+    return invalidOperationMsg(tscGetErrorMsgPayload(&pStmt->pSql->cmd), "set_tbname_tags status error");
   }
 
   pStmt->last = STMT_SETTBNAME;
@@ -1552,7 +1565,7 @@ int taos_stmt_set_tbname_tags(TAOS_STMT* stmt, const char* name, TAOS_BIND* tags
   } else {
     if (tags == NULL) {
       tscError("No tags set");
-      return TSDB_CODE_TSC_APP_ERROR;
+      return invalidOperationMsg(tscGetErrorMsgPayload(&pStmt->pSql->cmd), "no tags set");
     }
 
     int32_t ret = stmtGenInsertStatement(pSql, pStmt, name, tags);
diff --git a/tests/script/api/batchprepare.c b/tests/script/api/batchprepare.c
index 55eb62d9bb4272fe7ab85a96561ebd9c87343ed0..af0611ce738f4f7481bdcee313d5663ed8fae031 100644
--- a/tests/script/api/batchprepare.c
+++ b/tests/script/api/batchprepare.c
@@ -1860,6 +1860,224 @@ int stmt_funcb_autoctb_e2(TAOS_STMT *stmt) {
 
 
 
+
+
+
+
+//1 tables 10 records
+int stmt_funcb_autoctb_e3(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[10];
+      int8_t v1[10];
+      int16_t v2[10];
+      int32_t v4[10];
+      int64_t v8[10];
+      float f4[10];
+      double f8[10];
+      char bin[10][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 1 * 10);
+  
+  int *lb = malloc(10 * sizeof(int));
+
+  TAOS_BIND *tags = calloc(1, sizeof(TAOS_BIND) * 9 * 1);
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 1*10);
+
+//  int one_null = 1;
+  int one_not_null = 0;
+  
+  char* is_null = malloc(sizeof(char) * 10);
+  char* no_null = malloc(sizeof(char) * 10);
+
+  for (int i = 0; i < 10; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+  
+  for (int i = 0; i < 10; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[10*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 10;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = 10;
+
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = 10;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = 10;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = 10;
+
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = 10;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = 10;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = 10;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = 10;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = 10;
+    
+  }
+
+  int64_t tts = 1591060628000;
+  for (int i = 0; i < 10; ++i) {
+    v.ts[i] = tts + i;
+  }
+
+
+  for (int i = 0; i < 1; ++i) {
+    tags[i+0].buffer_type = TSDB_DATA_TYPE_INT;
+    tags[i+0].buffer = v.v4;
+    tags[i+0].is_null = &one_not_null;
+    tags[i+0].length = NULL;
+
+    tags[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    tags[i+1].buffer = v.b;
+    tags[i+1].is_null = &one_not_null;
+    tags[i+1].length = NULL;
+
+    tags[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    tags[i+2].buffer = v.v1;
+    tags[i+2].is_null = &one_not_null;
+    tags[i+2].length = NULL;
+
+    tags[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    tags[i+3].buffer = v.v2;
+    tags[i+3].is_null = &one_not_null;
+    tags[i+3].length = NULL;
+
+    tags[i+4].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    tags[i+4].buffer = v.v8;
+    tags[i+4].is_null = &one_not_null;
+    tags[i+4].length = NULL;
+
+    tags[i+5].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    tags[i+5].buffer = v.f4;
+    tags[i+5].is_null = &one_not_null;
+    tags[i+5].length = NULL;
+
+    tags[i+6].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    tags[i+6].buffer = v.f8;
+    tags[i+6].is_null = &one_not_null;
+    tags[i+6].length = NULL;
+
+    tags[i+7].buffer_type = TSDB_DATA_TYPE_BINARY;
+    tags[i+7].buffer = v.bin;
+    tags[i+7].is_null = &one_not_null;
+    tags[i+7].length = (uintptr_t *)lb;
+
+    tags[i+8].buffer_type = TSDB_DATA_TYPE_NCHAR;
+    tags[i+8].buffer = v.bin;
+    tags[i+8].is_null = &one_not_null;
+    tags[i+8].length = (uintptr_t *)lb;
+  }
+
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? using stb1 (id1,id2,id3,id4,id5,id6,id7,id8,id9) tags(?,?,?,?,?,?,?,?,?) values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+    return -1;
+    //exit(1);
+  }
+
+  int id = 0;
+  for (int zz = 0; zz < 1; zz++) {
+    char buf[32];
+    sprintf(buf, "m%d", zz);
+    code = taos_stmt_set_tbname_tags(stmt, buf, NULL);
+    if (code != 0){
+      printf("failed to execute taos_stmt_set_tbname_tags. code:0x%x\n", code);
+      return -1;
+    }  
+
+    taos_stmt_bind_param_batch(stmt, params + id * 10);
+    taos_stmt_add_batch(stmt);
+  }
+
+  if (taos_stmt_execute(stmt) != 0) {
+    printf("failed to execute insert statement.\n");
+    exit(1);
+  }
+
+  ++id;
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 10, (endtime-starttime)/1000000UL, (endtime-starttime)/(10));
+
+  free(v.ts);  
+  free(lb);
+  free(params);
+  free(is_null);
+  free(no_null);
+  free(tags);
+
+  return 0;
+}
+
+
+
 //300 tables 60 records
 int stmt_funcb1(TAOS_STMT *stmt) {
   struct {
@@ -3835,7 +4053,7 @@ void* runcase(void *par) {
 #endif
 
 
-#if 1  
+#if 1 
   prepare(taos, 1, 1);
 
   stmt = taos_stmt_init(taos);
@@ -3900,7 +4118,7 @@ void* runcase(void *par) {
 
 #endif
 
-#if 1  
+#if 1 
   prepare(taos, 1, 0);
 
   stmt = taos_stmt_init(taos);
@@ -3930,6 +4148,21 @@ void* runcase(void *par) {
 
 #endif
 
+#if 1  
+  prepare(taos, 1, 0);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("1t+10r+bm+autoctb+e3 start\n");
+  stmt_funcb_autoctb_e3(stmt);
+  printf("1t+10r+bm+autoctb+e3 end\n");
+  printf("check result start\n");
+  //check_result(taos, "m0", 1, 0);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+
+#endif
+
 
 #if 1
   prepare(taos, 1, 1);