diff --git a/src/kit/taosdemo/taosdemo.c b/src/kit/taosdemo/taosdemo.c
index cf84ecad43b953a2ba0432fee66992866eced324..1cdff80faa50b2168cfc350006b0f6cc85a48457 100644
--- a/src/kit/taosdemo/taosdemo.c
+++ b/src/kit/taosdemo/taosdemo.c
@@ -708,27 +708,24 @@ void *readTable(void *sarg) {
       sprintf(command, "select %s from %s%d where ts>= %" PRId64, aggreFunc[j], tb_prefix, i, sTime);
 
       double t = getCurrentTime();
-      if (taos_query(taos, command) != 0) {
-        fprintf(stderr, "Failed to query\n");
-        taos_close(taos);
-        exit(EXIT_FAILURE);
-      }
+      TAOS_RES *pSql = taos_query(taos, command);
+      int32_t code = taos_errno(pSql);
 
-      TAOS_RES *result = taos_use_result(taos);
-      if (result == NULL) {
-        fprintf(stderr, "Failed to retreive results:%s\n", taos_errstr(taos));
+      if (code != 0) {
+        fprintf(stderr, "Failed to query:%s\n", taos_errstr(taos));
+        taos_free_result(pSql);
         taos_close(taos);
-        exit(1);
+        exit(EXIT_FAILURE);
       }
 
-      while (taos_fetch_row(result) != NULL) {
+      while (taos_fetch_row(pSql) != NULL) {
         count++;
       }
 
       t = getCurrentTime() - t;
       totalT += t;
 
-      taos_free_result(result);
+      taos_free_result(pSql);
     }
 
     fprintf(fp, "|%10s  |   %10d   |  %12.2f   |   %10.2f  |\n",
@@ -779,20 +776,18 @@ void *readMetric(void *sarg) {
       fprintf(fp, "%s\n", command);
 
       double t = getCurrentTime();
-      if (taos_query(taos, command) != 0) {
-        fprintf(stderr, "Failed to query\n");
-        taos_close(taos);
-        exit(EXIT_FAILURE);
-      }
 
-      TAOS_RES *result = taos_use_result(taos);
-      if (result == NULL) {
-        fprintf(stderr, "Failed to retreive results:%s\n", taos_errstr(taos));
+      TAOS_RES *pSql = taos_query(taos, command);
+      int32_t code = taos_errno(pSql);
+
+      if (code != 0) {
+        fprintf(stderr, "Failed to query:%s\n", taos_errstr(taos));
+        taos_free_result(pSql);
         taos_close(taos);
         exit(1);
       }
       int count = 0;
-      while (taos_fetch_row(result) != NULL) {
+      while (taos_fetch_row(pSql) != NULL) {
         count++;
       }
       t = getCurrentTime() - t;
@@ -800,7 +795,7 @@ void *readMetric(void *sarg) {
       fprintf(fp, "| Speed: %12.2f(per s) | Latency: %.4f(ms) |\n", num_of_tables * num_of_DPT / t, t * 1000);
       printf("select %10s took %.6f second(s)\n\n", aggreFunc[j], t);
 
-      taos_free_result(result);
+      taos_free_result(pSql);
     }
     fprintf(fp, "\n");
   }
@@ -811,10 +806,19 @@ void *readMetric(void *sarg) {
 
 void queryDB(TAOS *taos, char *command) {
   int i = 5;
-  while (i > 0) {
-    if (taos_query(taos, command) == 0) break;
+  TAOS_RES *pSql = NULL;
+  int32_t code = -1;
+  while (i > 0 && code != 0) {
+    pSql = taos_query(taos, command);
+    code = taos_errno(pSql);
+    taos_free_result(pSql);
+    pSql = NULL;
+    if (code == 0) {
+      break;
+    }
     i--; 
   }
+
   if (i == 0) {
     fprintf(stderr, "Failed to run %s, reason: %s\n", command, taos_errstr(taos));
     taos_close(taos);
@@ -947,6 +951,7 @@ void callBack(void *param, TAOS_RES *res, int code) {
       break;
     }
   }
+   tb_info->timestamp = tmp_time;
 
   taos_query_a(tb_info->taos, buffer, callBack, tb_info);
 
diff --git a/src/kit/taosdump/taosdump.c b/src/kit/taosdump/taosdump.c
index 9886a91f48242191a6259a9d15bbc1f3cefc0a81..6b7ffb200155e293ae7e7881d8408335600ffeb7 100644
--- a/src/kit/taosdump/taosdump.c
+++ b/src/kit/taosdump/taosdump.c
@@ -372,14 +372,12 @@ int taosGetTableRecordInfo(char *table, STableRecordInfo *pTableRecordInfo) {
   memset(pTableRecordInfo, 0, sizeof(STableRecordInfo));
 
   sprintf(command, "show tables like %s", table);
-  if (taos_query(taos, command) != 0) {
-    fprintf(stderr, "failed to run command %s\n", command);
-    return -1;
-  }
+  TAOS_RES *result = taos_query(taos, command);\
+  int32_t code = taos_errno(result);
 
-  result = taos_use_result(taos);
-  if (result == NULL) {
-    fprintf(stderr, "failed to use result\n");
+  if (code != 0) {
+    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
+    taos_free_result(result);
     return -1;
   }
 
@@ -400,14 +398,12 @@ int taosGetTableRecordInfo(char *table, STableRecordInfo *pTableRecordInfo) {
   if (isSet) return 0;
 
   sprintf(command, "show stables like %s", table);
-  if (taos_query(taos, command) != 0) {
-    fprintf(stderr, "failed to run command %s\n", command);
-    return -1;
-  }
 
-  result = taos_use_result(taos);
-  if (result == NULL) {
-    fprintf(stderr, "failed to use result\n");
+  result = taos_query(taos, command);
+  code = taos_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
+    taos_free_result(result);
     return -1;
   }
 
@@ -467,14 +463,11 @@ int taosDumpOut(SDumpArguments *arguments) {
   taosDumpCharset(fp);
 
   sprintf(command, "show databases");
-  if (taos_query(taos, command) != 0) {
+  result = taos_query(taos, command);
+  int32_t code = taos_errno(result);
+  if (code != 0) {
     fprintf(stderr, "failed to run command: %s, reason: %s\n", command, taos_errstr(taos));
-    goto _exit_failure;
-  }
-
-  result = taos_use_result(taos);
-  if (result == NULL) {
-    fprintf(stderr, "failed to use result\n");
+    taos_free_result(result);
     goto _exit_failure;
   }
 
@@ -612,7 +605,7 @@ int taosDumpDb(SDbInfo *dbInfo, SDumpArguments *arguments, FILE *fp) {
   taosDumpCreateDbClause(dbInfo, arguments->with_property, fp);
 
   sprintf(command, "use %s", dbInfo->name);
-  if (taos_query(taos, command) != 0) {
+  if (taos_errno(taos_query(taos, command)) != 0) {
     fprintf(stderr, "invalid database %s\n", dbInfo->name);
     return -1;
   }
@@ -620,14 +613,11 @@ int taosDumpDb(SDbInfo *dbInfo, SDumpArguments *arguments, FILE *fp) {
   fprintf(fp, "USE %s\n\n", dbInfo->name);
 
   sprintf(command, "show tables");
-  if (taos_query(taos, command) != 0) {
-    fprintf(stderr, "failed to run command %s\n", command);
-    return -1;
-  }
-
-  result = taos_use_result(taos);
-  if (result == NULL) {
-    fprintf(stderr, "failed to use result\n");
+  result = taos_query(taos,command);
+  int32_t code = taos_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
+    taos_free_result(result);
     return -1;
   }
 
@@ -725,14 +715,11 @@ void taosDumpCreateMTableClause(STableDef *tableDes, char *metric, int numOfCols
     TAOS_ROW row = NULL;
 
     sprintf(command, "select %s from %s limit 1", tableDes->cols[counter].field, tableDes->name);
-    if (taos_query(taos, command) != 0) {
-      fprintf(stderr, "failed to run command %s\n", command);
-      return;
-    }
 
-    result = taos_use_result(taos);
-    if (result == NULL) {
-      fprintf(stderr, "failed to use result\n");
+    result = taos_query(taos, command);
+    int32_t code = taos_errno(result);
+    if (code != 0) {
+      fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
       return;
     }
 
@@ -806,14 +793,12 @@ int taosGetTableDes(char *table, STableDef *tableDes) {
   int count = 0;
 
   sprintf(command, "describe %s", table);
-  if (taos_query(taos, command) != 0) {
-    fprintf(stderr, "failed to run command %s\n", command);
-    return -1;
-  }
 
-  result = taos_use_result(taos);
-  if (result == NULL) {
-    fprintf(stderr, "failed to use result\n");
+  result = taos_query(taos, command);
+  int32_t code = taos_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
+    taos_free_result(result);
     return -1;
   }
 
@@ -889,14 +874,11 @@ int32_t taosDumpMetric(char *metric, SDumpArguments *arguments, FILE *fp) {
   strcpy(tableRecord.metric, metric);
 
   sprintf(command, "select tbname from %s", metric);
-  if (taos_query(taos, command) != 0) {
-    fprintf(stderr, "failed to run command %s\n", command);
-    return -1;
-  }
-
-  result = taos_use_result(taos);
-  if (result == NULL) {
-    fprintf(stderr, "failed to use result\n");
+  result = taos_query(taos, command);
+  int32_t code = taos_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "failed to run command %s, error: %s\n", command, taos_errstr(result));
+    taos_free_result(result);
     return -1;
   }
 
@@ -942,18 +924,16 @@ int taosDumpTableData(FILE *fp, char *tbname, SDumpArguments *arguments) {
 
   sprintf(command, "select * from %s where _c0 >= %" PRId64 " and _c0 <= %" PRId64 " order by _c0 asc", tbname, arguments->start_time,
           arguments->end_time);
-  if (taos_query(taos, command) != 0) {
-    fprintf(stderr, "failed to run command %s, reason: %s\n", command, taos_errstr(taos));
-    return -1;
-  }
-
-  result = taos_use_result(taos);
-  if (result == NULL) {
-    fprintf(stderr, "failed to use result\n");
+          
+  result = taos_query(taos, command);
+  int32_t code = taos_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "failed to run command %s, reason: %s\n", command, taos_errstr(result));
+    taos_free_result(result);
     return -1;
   }
 
-  numFields = taos_field_count(taos);
+  numFields = taos_field_count(result);
   assert(numFields > 0);
   TAOS_FIELD *fields = taos_fetch_fields(result);
   tbuf = (char *)malloc(COMMAND_SIZE);
@@ -1242,9 +1222,14 @@ int taosDumpIn(SDumpArguments *arguments) {
         tcommand = command;
       }
       taosReplaceCtrlChar(tcommand);
-      if (taos_query(taos, tcommand) != 0)
+      result = taos_query(taos, tcommand);
+      int32_t code = taos_errno(result);
+      if (code != 0) 
+      {
         fprintf(stderr, "linenu:%" PRId64 " failed to run command %s reason: %s \ncontinue...\n", linenu, command,
                 taos_errstr(taos));
+      }
+      taos_free_result(result);
     }
 
     pstr = command;