diff --git a/include/client/taos.h b/include/client/taos.h
index 0b8c67aa794363ff851c69e5848978c78c6a4abc..94e6221b3184a4a5601758bb4d16c22838efab62 100644
--- a/include/client/taos.h
+++ b/include/client/taos.h
@@ -85,6 +85,14 @@ typedef struct taosField {
   int32_t bytes;
 } TAOS_FIELD;
 
+typedef struct TAOS_FIELD_E {
+  char    name[65];
+  int8_t  type;
+  uint8_t precision;
+  uint8_t scale;
+  int32_t bytes;
+} TAOS_FIELD_E;
+
 #ifdef WINDOWS
 #define DLL_EXPORT __declspec(dllexport)
 #else
@@ -135,6 +143,8 @@ DLL_EXPORT int        taos_stmt_prepare(TAOS_STMT *stmt, const char *sql, unsign
 DLL_EXPORT int        taos_stmt_set_tbname_tags(TAOS_STMT *stmt, const char *name, TAOS_MULTI_BIND *tags);
 DLL_EXPORT int        taos_stmt_set_tbname(TAOS_STMT *stmt, const char *name);
 DLL_EXPORT int        taos_stmt_set_sub_tbname(TAOS_STMT *stmt, const char *name);
+DLL_EXPORT int        taos_stmt_get_tag_fields(TAOS_STMT *stmt, int* fieldNum, TAOS_FIELD_E** fields);
+DLL_EXPORT int        taos_stmt_get_col_fields(TAOS_STMT *stmt, int* fieldNum, TAOS_FIELD_E** fields);
 
 DLL_EXPORT int       taos_stmt_is_insert(TAOS_STMT *stmt, int *insert);
 DLL_EXPORT int       taos_stmt_num_params(TAOS_STMT *stmt, int *nums);
diff --git a/include/libs/parser/parser.h b/include/libs/parser/parser.h
index 06272b81514cec2a294da513ec2a57447ad74ef1..ca825b9e2fb460b6aa35110c89535071a50cac52 100644
--- a/include/libs/parser/parser.h
+++ b/include/libs/parser/parser.h
@@ -77,8 +77,8 @@ int32_t qStmtParseQuerySql(SParseContext* pCxt, SQuery* pQuery);
 int32_t qBindStmtColsValue(void* pBlock, TAOS_MULTI_BIND* bind, char* msgBuf, int32_t msgBufLen);
 int32_t qBindStmtSingleColValue(void* pBlock, TAOS_MULTI_BIND* bind, char* msgBuf, int32_t msgBufLen, int32_t colIdx,
                                 int32_t rowNum);
-int32_t qBuildStmtColFields(void* pDataBlock, int32_t* fieldNum, TAOS_FIELD** fields);
-int32_t qBuildStmtTagFields(void* pBlock, void* boundTags, int32_t* fieldNum, TAOS_FIELD** fields);
+int32_t qBuildStmtColFields(void* pDataBlock, int32_t* fieldNum, TAOS_FIELD_E** fields);
+int32_t qBuildStmtTagFields(void* pBlock, void* boundTags, int32_t* fieldNum, TAOS_FIELD_E** fields);
 int32_t qBindStmtTagsValue(void* pBlock, void* boundTags, int64_t suid, char* tName, TAOS_MULTI_BIND* bind,
                            char* msgBuf, int32_t msgBufLen);
 void    destroyBoundColumnInfo(void* pBoundInfo);
diff --git a/source/client/inc/clientStmt.h b/source/client/inc/clientStmt.h
index f0c9dcd67dd8e3b05775003221ddf86681da37ab..936fb92fc4019842485e7051abf161aee8a7d858 100644
--- a/source/client/inc/clientStmt.h
+++ b/source/client/inc/clientStmt.h
@@ -116,8 +116,11 @@ int stmtAffectedRowsOnce(TAOS_STMT *stmt);
 int stmtPrepare(TAOS_STMT *stmt, const char *sql, unsigned long length);
 int stmtSetTbName(TAOS_STMT *stmt, const char *tbName);
 int stmtSetTbTags(TAOS_STMT *stmt, TAOS_MULTI_BIND *tags);
+int stmtGetTagFields(TAOS_STMT* stmt, int* nums, TAOS_FIELD_E** fields);
+int stmtGetColFields(TAOS_STMT* stmt, int* nums, TAOS_FIELD_E** fields);
 int stmtIsInsert(TAOS_STMT *stmt, int *insert);
 int stmtGetParamNum(TAOS_STMT *stmt, int *nums);
+int stmtGetParam(TAOS_STMT *stmt, int idx, int *type, int *bytes);
 int stmtAddBatch(TAOS_STMT *stmt);
 TAOS_RES *stmtUseResult(TAOS_STMT *stmt);
 int stmtBindBatch(TAOS_STMT *stmt, TAOS_MULTI_BIND *bind, int32_t colIdx);
diff --git a/source/client/src/clientMain.c b/source/client/src/clientMain.c
index 53eb443b36b05393b22667a6f623892008f14ebb..e144885e9efc4b3eca7c806996b77ad416d70161 100644
--- a/source/client/src/clientMain.c
+++ b/source/client/src/clientMain.c
@@ -666,8 +666,39 @@ int taos_stmt_set_tbname(TAOS_STMT *stmt, const char *name) {
   return stmtSetTbName(stmt, name);
 }
 
+int taos_stmt_set_tags(TAOS_STMT *stmt, TAOS_MULTI_BIND *tags) {
+  if (stmt == NULL || tags == NULL) {
+    tscError("NULL parameter for %s", __FUNCTION__);
+    terrno = TSDB_CODE_INVALID_PARA;
+    return terrno;
+  }
+
+  return stmtSetTbTags(stmt, tags);
+}
+
+
 int taos_stmt_set_sub_tbname(TAOS_STMT *stmt, const char *name) { return taos_stmt_set_tbname(stmt, name); }
 
+int taos_stmt_get_tag_fields(TAOS_STMT *stmt, int* fieldNum, TAOS_FIELD_E** fields) {
+  if (stmt == NULL || NULL == fieldNum) {
+    tscError("NULL parameter for %s", __FUNCTION__);
+    terrno = TSDB_CODE_INVALID_PARA;
+    return terrno;
+  }
+  
+  return stmtGetTagFields(stmt, fieldNum, fields);
+}
+
+int taos_stmt_get_col_fields(TAOS_STMT *stmt, int* fieldNum, TAOS_FIELD_E** fields) {
+  if (stmt == NULL || NULL == fieldNum) {
+    tscError("NULL parameter for %s", __FUNCTION__);
+    terrno = TSDB_CODE_INVALID_PARA;
+    return terrno;
+  }
+  
+  return stmtGetColFields(stmt, fieldNum, fields);
+}
+
 int taos_stmt_bind_param(TAOS_STMT *stmt, TAOS_MULTI_BIND *bind) {
   if (stmt == NULL || bind == NULL) {
     tscError("NULL parameter for %s", __FUNCTION__);
@@ -772,6 +803,16 @@ int taos_stmt_num_params(TAOS_STMT *stmt, int *nums) {
   return stmtGetParamNum(stmt, nums);
 }
 
+int taos_stmt_get_param(TAOS_STMT *stmt, int idx, int *type, int *bytes) {
+  if (stmt == NULL || type == NULL || NULL == bytes || idx < 0) {
+    tscError("invalid parameter for %s", __FUNCTION__);
+    terrno = TSDB_CODE_INVALID_PARA;
+    return terrno;
+  }
+
+  return stmtGetParam(stmt, idx, type, bytes);
+}
+
 TAOS_RES *taos_stmt_use_result(TAOS_STMT *stmt) {
   if (stmt == NULL) {
     tscError("NULL parameter for %s", __FUNCTION__);
diff --git a/source/client/src/clientStmt.c b/source/client/src/clientStmt.c
index 01d785ef73107778c818437c18d98c778d1f8893..3adb3684da1164363a1ffda4c26130643efc5f78 100644
--- a/source/client/src/clientStmt.c
+++ b/source/client/src/clientStmt.c
@@ -17,7 +17,7 @@ int32_t stmtSwitchStatus(STscStmt* pStmt, STMT_STATUS newStatus) {
       }
       break;
     case STMT_SETTAGS:
-      if (STMT_STATUS_NE(SETTBNAME)) {
+      if (STMT_STATUS_NE(SETTBNAME) && STMT_STATUS_NE(FETCH_FIELDS)) {
         code = TSDB_CODE_TSC_STMT_API_ERROR;
       }
       break;
@@ -540,6 +540,8 @@ int stmtSetTbName(TAOS_STMT* stmt, const char* tbName) {
   if (pStmt->bInfo.needParse) {
     strncpy(pStmt->bInfo.tbName, tbName, sizeof(pStmt->bInfo.tbName) - 1);
     pStmt->bInfo.tbName[sizeof(pStmt->bInfo.tbName) - 1] = 0;
+
+    STMT_ERR_RET(stmtParseSql(pStmt));
   }
 
   return TSDB_CODE_SUCCESS;
@@ -550,10 +552,6 @@ int stmtSetTbTags(TAOS_STMT* stmt, TAOS_MULTI_BIND* tags) {
 
   STMT_ERR_RET(stmtSwitchStatus(pStmt, STMT_SETTAGS));
 
-  if (pStmt->bInfo.needParse) {
-    STMT_ERR_RET(stmtParseSql(pStmt));
-  }
-
   if (pStmt->bInfo.inExecCache) {
     return TSDB_CODE_SUCCESS;
   }
@@ -571,7 +569,7 @@ int stmtSetTbTags(TAOS_STMT* stmt, TAOS_MULTI_BIND* tags) {
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t stmtFetchTagFields(STscStmt* pStmt, int32_t* fieldNum, TAOS_FIELD** fields) {
+int stmtFetchTagFields(STscStmt* pStmt, int32_t* fieldNum, TAOS_FIELD_E** fields) {
   if (STMT_TYPE_QUERY == pStmt->sql.type) {
     tscError("invalid operation to get query tag fileds");
     STMT_ERR_RET(TSDB_CODE_TSC_STMT_API_ERROR);
@@ -589,7 +587,7 @@ int32_t stmtFetchTagFields(STscStmt* pStmt, int32_t* fieldNum, TAOS_FIELD** fiel
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t stmtFetchColFields(STscStmt* pStmt, int32_t* fieldNum, TAOS_FIELD** fields) {
+int stmtFetchColFields(STscStmt* pStmt, int32_t* fieldNum, TAOS_FIELD_E** fields) {
   if (STMT_TYPE_QUERY == pStmt->sql.type) {
     tscError("invalid operation to get query column fileds");
     STMT_ERR_RET(TSDB_CODE_TSC_STMT_API_ERROR);
@@ -852,6 +850,71 @@ int stmtIsInsert(TAOS_STMT* stmt, int* insert) {
   return TSDB_CODE_SUCCESS;
 }
 
+int stmtGetTagFields(TAOS_STMT* stmt, int* nums, TAOS_FIELD_E** fields) {
+  STscStmt* pStmt = (STscStmt*)stmt;
+
+  if (STMT_TYPE_QUERY == pStmt->sql.type) {
+    STMT_RET(TSDB_CODE_TSC_STMT_API_ERROR);
+  }
+  
+  STMT_ERR_RET(stmtSwitchStatus(pStmt, STMT_FETCH_FIELDS));
+
+  if (pStmt->bInfo.needParse && pStmt->sql.runTimes && pStmt->sql.type > 0 &&
+      STMT_TYPE_MULTI_INSERT != pStmt->sql.type) {
+    pStmt->bInfo.needParse = false;
+  }
+
+  if (pStmt->exec.pRequest && STMT_TYPE_QUERY == pStmt->sql.type && pStmt->sql.runTimes) {
+    taos_free_result(pStmt->exec.pRequest);
+    pStmt->exec.pRequest = NULL;
+  }
+
+  if (NULL == pStmt->exec.pRequest) {
+    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
+  }
+
+  if (pStmt->bInfo.needParse) {
+    STMT_ERR_RET(stmtParseSql(pStmt));
+  }
+
+  STMT_ERR_RET(stmtFetchTagFields(stmt, nums, fields));
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int stmtGetColFields(TAOS_STMT* stmt, int* nums, TAOS_FIELD_E** fields) {
+  STscStmt* pStmt = (STscStmt*)stmt;
+
+  if (STMT_TYPE_QUERY == pStmt->sql.type) {
+    STMT_RET(TSDB_CODE_TSC_STMT_API_ERROR);
+  }
+  
+  STMT_ERR_RET(stmtSwitchStatus(pStmt, STMT_FETCH_FIELDS));
+
+  if (pStmt->bInfo.needParse && pStmt->sql.runTimes && pStmt->sql.type > 0 &&
+      STMT_TYPE_MULTI_INSERT != pStmt->sql.type) {
+    pStmt->bInfo.needParse = false;
+  }
+
+  if (pStmt->exec.pRequest && STMT_TYPE_QUERY == pStmt->sql.type && pStmt->sql.runTimes) {
+    taos_free_result(pStmt->exec.pRequest);
+    pStmt->exec.pRequest = NULL;
+  }
+
+  if (NULL == pStmt->exec.pRequest) {
+    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
+  }
+
+  if (pStmt->bInfo.needParse) {
+    STMT_ERR_RET(stmtParseSql(pStmt));
+  }
+
+  STMT_ERR_RET(stmtFetchColFields(stmt, nums, fields));
+
+  return TSDB_CODE_SUCCESS;
+}
+
+
 int stmtGetParamNum(TAOS_STMT* stmt, int* nums) {
   STscStmt* pStmt = (STscStmt*)stmt;
 
@@ -884,6 +947,50 @@ int stmtGetParamNum(TAOS_STMT* stmt, int* nums) {
   return TSDB_CODE_SUCCESS;
 }
 
+int stmtGetParam(TAOS_STMT *stmt, int idx, int *type, int *bytes) {
+  STscStmt* pStmt = (STscStmt*)stmt;
+
+  if (STMT_TYPE_QUERY == pStmt->sql.type) {
+    STMT_RET(TSDB_CODE_TSC_STMT_API_ERROR);
+  }
+  
+  STMT_ERR_RET(stmtSwitchStatus(pStmt, STMT_FETCH_FIELDS));
+
+  if (pStmt->bInfo.needParse && pStmt->sql.runTimes && pStmt->sql.type > 0 &&
+      STMT_TYPE_MULTI_INSERT != pStmt->sql.type) {
+    pStmt->bInfo.needParse = false;
+  }
+
+  if (pStmt->exec.pRequest && STMT_TYPE_QUERY == pStmt->sql.type && pStmt->sql.runTimes) {
+    taos_free_result(pStmt->exec.pRequest);
+    pStmt->exec.pRequest = NULL;
+  }
+
+  if (NULL == pStmt->exec.pRequest) {
+    STMT_ERR_RET(buildRequest(pStmt->taos, pStmt->sql.sqlStr, pStmt->sql.sqlLen, &pStmt->exec.pRequest));
+  }
+
+  if (pStmt->bInfo.needParse) {
+    STMT_ERR_RET(stmtParseSql(pStmt));
+  }
+
+  int32_t nums = 0;
+  TAOS_FIELD_E *pField = NULL;
+  STMT_ERR_RET(stmtFetchColFields(stmt, &nums, &pField));
+  if (idx >= nums) {
+    tscError("idx %d is too big", idx);
+    taosMemoryFree(pField);
+    STMT_ERR_RET(TSDB_CODE_INVALID_PARA);
+  }
+
+  *type = pField[idx].type;
+  *bytes = pField[idx].bytes;
+
+  taosMemoryFree(pField);
+
+  return TSDB_CODE_SUCCESS;
+}
+
 TAOS_RES* stmtUseResult(TAOS_STMT* stmt) {
   STscStmt* pStmt = (STscStmt*)stmt;
 
diff --git a/source/libs/parser/src/parInsert.c b/source/libs/parser/src/parInsert.c
index 047c2d15045f667d41319b6d7c14c475cd6273a1..a6e2473c4f945ed48fcaa053c7d7662a32f61335 100644
--- a/source/libs/parser/src/parInsert.c
+++ b/source/libs/parser/src/parInsert.c
@@ -1724,18 +1724,23 @@ int32_t qBindStmtSingleColValue(void* pBlock, TAOS_MULTI_BIND* bind, char* msgBu
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t buildBoundFields(SParsedDataColInfo* boundInfo, SSchema* pSchema, int32_t* fieldNum, TAOS_FIELD** fields) {
+int32_t buildBoundFields(SParsedDataColInfo* boundInfo, SSchema* pSchema, int32_t* fieldNum, TAOS_FIELD_E** fields, uint8_t timePrec) {
   if (fields) {
     *fields = taosMemoryCalloc(boundInfo->numOfBound, sizeof(TAOS_FIELD));
     if (NULL == *fields) {
       return TSDB_CODE_OUT_OF_MEMORY;
     }
 
+    SSchema* pSchema = &pSchema[boundInfo->boundColumns[0]];
+    if (TSDB_DATA_TYPE_TIMESTAMP == pSchema->type) {
+      (*fields)[0].precision = timePrec;
+    }
+    
     for (int32_t i = 0; i < boundInfo->numOfBound; ++i) {
-      SSchema* pTagSchema = &pSchema[boundInfo->boundColumns[i]];
-      strcpy((*fields)[i].name, pTagSchema->name);
-      (*fields)[i].type = pTagSchema->type;
-      (*fields)[i].bytes = pTagSchema->bytes;
+      SSchema* pSchema = &pSchema[boundInfo->boundColumns[i]];
+      strcpy((*fields)[i].name, pSchema->name);
+      (*fields)[i].type = pSchema->type;
+      (*fields)[i].bytes = pSchema->bytes;
     }
   }
 
@@ -1744,7 +1749,7 @@ int32_t buildBoundFields(SParsedDataColInfo* boundInfo, SSchema* pSchema, int32_
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t qBuildStmtTagFields(void* pBlock, void* boundTags, int32_t* fieldNum, TAOS_FIELD** fields) {
+int32_t qBuildStmtTagFields(void* pBlock, void* boundTags, int32_t* fieldNum, TAOS_FIELD_E** fields) {
   STableDataBlocks*   pDataBlock = (STableDataBlocks*)pBlock;
   SParsedDataColInfo* tags = (SParsedDataColInfo*)boundTags;
   if (NULL == tags) {
@@ -1759,12 +1764,12 @@ int32_t qBuildStmtTagFields(void* pBlock, void* boundTags, int32_t* fieldNum, TA
     return TSDB_CODE_SUCCESS;
   }
 
-  CHECK_CODE(buildBoundFields(tags, pSchema, fieldNum, fields));
+  CHECK_CODE(buildBoundFields(tags, pSchema, fieldNum, fields, 0));
 
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t qBuildStmtColFields(void* pBlock, int32_t* fieldNum, TAOS_FIELD** fields) {
+int32_t qBuildStmtColFields(void* pBlock, int32_t* fieldNum, TAOS_FIELD_E** fields) {
   STableDataBlocks* pDataBlock = (STableDataBlocks*)pBlock;
   SSchema*          pSchema = getTableColumnSchema(pDataBlock->pTableMeta);
   if (pDataBlock->boundColumnInfo.numOfBound <= 0) {
@@ -1776,7 +1781,7 @@ int32_t qBuildStmtColFields(void* pBlock, int32_t* fieldNum, TAOS_FIELD** fields
     return TSDB_CODE_SUCCESS;
   }
 
-  CHECK_CODE(buildBoundFields(&pDataBlock->boundColumnInfo, pSchema, fieldNum, fields));
+  CHECK_CODE(buildBoundFields(&pDataBlock->boundColumnInfo, pSchema, fieldNum, fields, pDataBlock->pTableMeta->tableInfo.precision));
 
   return TSDB_CODE_SUCCESS;
 }