enh:[TS-5441] cost too long in tmq write meta data by cache meta and vg info

Jenkinsfile2

@@ -426,6 +426,10 @@ pipeline {
                                        cd ${WKC}/tests/parallel_test
                                        ./run_check_assert_container.sh -d ${WKDIR}
                                     '''
+                                    sh '''
+                                       cd ${WKC}/tests/parallel_test
+                                       ./run_check_void_container.sh -d ${WKDIR}
+                                    '''
                                     sh '''
                                         date
                                         rm -rf ${WKC}/debug

cmake/cmake.install

@@ -7,7 +7,17 @@ ADD_CUSTOM_COMMAND(OUTPUT ${PREPARE_ENV_CMD}
     COMMAND ${CMAKE_COMMAND} -E make_directory ${TD_TESTS_OUTPUT_DIR}/cfg/
     COMMAND ${CMAKE_COMMAND} -E make_directory ${TD_TESTS_OUTPUT_DIR}/log/
     COMMAND ${CMAKE_COMMAND} -E make_directory ${TD_TESTS_OUTPUT_DIR}/data/
-    COMMAND ${CMAKE_COMMAND} -E echo dataDir ${TD_TESTS_OUTPUT_DIR}/data > ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo firstEp localhost:6030 > ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo fqdn localhost >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo serverPort 6030 >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo debugFlag 135 >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo asyncLog 0 >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo supportVnodes 1024 >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo numOfLogLines 300000000 >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo logKeepDays -1 >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo checkpointInterval 60 >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo snodeAddress 127.0.0.1:873 >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
+    COMMAND ${CMAKE_COMMAND} -E echo dataDir ${TD_TESTS_OUTPUT_DIR}/data >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
     COMMAND ${CMAKE_COMMAND} -E echo logDir ${TD_TESTS_OUTPUT_DIR}/log  >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
     COMMAND ${CMAKE_COMMAND} -E echo charset UTF-8  >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
     COMMAND ${CMAKE_COMMAND} -E echo monitor 0  >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg

docs/examples/c-ws/.gitignore

@@ -0,0 +1,3 @@
+*
+!*.c
+!.gitignore

docs/examples/c-ws/connect_example.c

@@ -0,0 +1,21 @@
+// compile with
+// gcc connect_example.c -o connect_example -ltaos
+#include <stdio.h>
+#include <stdlib.h>
+#include "taosws.h"
+
+int main() {
+  ws_enable_log("debug");
+  char    *dsn = "ws://localhost:6041";
+  WS_TAOS *taos = ws_connect(dsn);
+  if (taos == NULL) {
+    fprintf(stderr, "Failed to connect to %s, ErrCode: 0x%x, ErrMessage: %s.\n", dsn, ws_errno(NULL), ws_errstr(NULL));
+    return -1;
+  }
+  fprintf(stdout, "Connected to %s successfully.\n", dsn);
+
+  /* put your code here for read and write */
+
+  // close & clean
+  ws_close(taos);
+}

docs/examples/c-ws/create_db_demo.c

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// TAOS standard API example. The same syntax as MySQL, but only a subset
+// to compile: gcc -o create_db_demo create_db_demo.c -ltaos
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "taosws.h"
+
+static int DemoCreateDB() {
+  ws_enable_log("debug");
+  // ANCHOR: create_db_and_table
+  int   code = 0;
+  char *dsn = "ws://localhost:6041";
+  // connect
+  WS_TAOS *taos = ws_connect(dsn);
+
+  if (taos == NULL) {
+    fprintf(stderr, "Failed to connect to %s, ErrCode: 0x%x, ErrMessage: %s.\n", dsn, ws_errno(NULL), ws_errstr(NULL));
+    return -1;
+  }
+
+  // create database
+  WS_RES *result = ws_query(taos, "CREATE DATABASE IF NOT EXISTS power");
+  code = ws_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "Failed to create database power, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+  ws_free_result(result);
+  fprintf(stdout, "Create database power successfully.\n");
+
+  // create table
+  const char *sql =
+      "CREATE STABLE IF NOT EXISTS power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (groupId "
+      "INT, location BINARY(24))";
+  result = ws_query(taos, sql);
+  code = ws_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "Failed to create stable power.meters, ErrCode: 0x%x, ErrMessage: %s\n.", code, ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+  ws_free_result(result);
+  fprintf(stdout, "Create stable power.meters successfully.\n");
+
+  // close & clean
+  ws_close(taos);
+  return 0;
+  // ANCHOR_END: create_db_and_table
+}
+
+int main(int argc, char *argv[]) { return DemoCreateDB(); }

docs/examples/c-ws/insert_data_demo.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// TAOS standard API example. The same syntax as MySQL, but only a subset
+// to compile: gcc -o insert_data_demo insert_data_demo.c -ltaos
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "taosws.h"
+
+static int DemoInsertData() {
+  // ANCHOR: insert_data
+  int   code = 0;
+  char *dsn = "ws://localhost:6041";
+  // connect
+  WS_TAOS *taos = ws_connect(dsn);
+  if (taos == NULL) {
+    fprintf(stderr, "Failed to connect to %s, ErrCode: 0x%x, ErrMessage: %s.\n", dsn, ws_errno(NULL), ws_errstr(NULL));
+    return -1;
+  }
+
+  // insert data, please make sure the database and table are already created
+  const char *sql =
+      "INSERT INTO "
+      "power.d1001 USING power.meters TAGS(2,'California.SanFrancisco') "
+      "VALUES "
+      "(NOW + 1a, 10.30000, 219, 0.31000) "
+      "(NOW + 2a, 12.60000, 218, 0.33000) "
+      "(NOW + 3a, 12.30000, 221, 0.31000) "
+      "power.d1002 USING power.meters TAGS(3, 'California.SanFrancisco') "
+      "VALUES "
+      "(NOW + 1a, 10.30000, 218, 0.25000) ";
+  WS_RES *result = ws_query(taos, sql);
+  code = ws_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "Failed to insert data to power.meters, sql: %s, ErrCode: 0x%x, ErrMessage: %s\n.", sql, code,
+            ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+  ws_free_result(result);
+
+  // you can check affectedRows here
+  int rows = ws_affected_rows(result);
+  fprintf(stdout, "Successfully inserted %d rows into power.meters.\n", rows);
+
+  // close & clean
+  ws_close(taos);
+  return 0;
+  // ANCHOR_END: insert_data
+}
+
+int main(int argc, char *argv[]) { return DemoInsertData(); }

docs/examples/c-ws/query_data_demo.c

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// TAOS standard API example. The same syntax as MySQL, but only a subset
+// to compile: gcc -o query_data_demo query_data_demo.c -ltaos
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "taosws.h"
+
+static int DemoQueryData() {
+  // ANCHOR: query_data
+  int   code = 0;
+  char *dsn = "ws://localhost:6041";
+
+  // connect
+  WS_TAOS *taos = ws_connect(dsn);
+  if (taos == NULL) {
+    fprintf(stderr, "Failed to connect to %s, ErrCode: 0x%x, ErrMessage: %s.\n", dsn, ws_errno(NULL), ws_errstr(NULL));
+    return -1;
+  }
+
+  // query data, please make sure the database and table are already created
+  const char *sql = "SELECT ts, current, location FROM power.meters limit 100";
+  WS_RES     *result = ws_query(taos, sql);
+  code = ws_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "Failed to query data from power.meters, sql: %s, ErrCode: 0x%x, ErrMessage: %s\n.", sql, code,
+            ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+
+  WS_ROW          row = NULL;
+  int             rows = 0;
+  int             num_fields = ws_field_count(result);
+  const WS_FIELD *fields = ws_fetch_fields(result);
+
+  fprintf(stdout, "query successfully, got %d fields, the sql is: %s.\n", num_fields, sql);
+
+  // fetch the records row by row
+  while ((row = ws_fetch_row(result))) {
+    // Add your data processing logic here
+
+    rows++;
+  }
+  fprintf(stdout, "total rows: %d\n", rows);
+  ws_free_result(result);
+
+  // close & clean
+  ws_close(taos);
+  return 0;
+  // ANCHOR_END: query_data
+}
+
+int main(int argc, char *argv[]) { return DemoQueryData(); }

docs/examples/c-ws/sml_insert_demo.c

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// TAOS standard API example. The same syntax as MySQL, but only a subset
+// to compile: gcc -o sml_insert_demo sml_insert_demo.c -ltaos
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "taosws.h"
+
+static int DemoSmlInsert() {
+  // ANCHOR: schemaless
+  int   code = 0;
+  char *dsn = "ws://localhost:6041";
+
+  // connect
+  WS_TAOS *taos = ws_connect(dsn);
+  if (taos == NULL) {
+    fprintf(stderr, "Failed to connect to %s, ErrCode: 0x%x, ErrMessage: %s.\n", dsn, ws_errno(NULL), ws_errstr(NULL));
+    return -1;
+  }
+
+  // create database
+  WS_RES *result = ws_query(taos, "CREATE DATABASE IF NOT EXISTS power");
+  code = ws_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "Failed to create database power, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+  ws_free_result(result);
+
+  // use database
+  result = ws_query(taos, "USE power");
+  code = ws_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "Failed to execute use power, ErrCode: 0x%x, ErrMessage: %s\n.", code, ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+  ws_free_result(result);
+
+  // schemaless demo data
+  char *line_demo =
+      "meters,groupid=2,location=California.SanFrancisco current=10.3000002f64,voltage=219i32,phase=0.31f64 "
+      "1626006833639";
+  char *telnet_demo = "metric_telnet 1707095283260 4 host=host0 interface=eth0";
+  char *json_demo =
+      "{\"metric\": \"metric_json\",\"timestamp\": 1626846400,\"value\": 10.3, \"tags\": {\"groupid\": 2, "
+      "\"location\": \"California.SanFrancisco\", \"id\": \"d1001\"}}";
+
+  // influxdb line protocol
+  char *lines[] = {line_demo};
+  int   totalLines = 0;
+  result = ws_schemaless_insert_raw(taos, line_demo, strlen(line_demo), &totalLines, WS_TSDB_SML_LINE_PROTOCOL,
+                                    WS_TSDB_SML_TIMESTAMP_MILLI_SECONDS);
+  code = ws_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "Failed to insert schemaless line data, data: %s, ErrCode: 0x%x, ErrMessage: %s\n.", line_demo,
+            code, ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+
+  fprintf(stdout, "Insert %d rows of schemaless line data successfully.\n", totalLines);
+  ws_free_result(result);
+
+  // opentsdb telnet protocol
+  totalLines = 0;
+  result = ws_schemaless_insert_raw(taos, telnet_demo, strlen(telnet_demo), &totalLines, WS_TSDB_SML_TELNET_PROTOCOL,
+                                    WS_TSDB_SML_TIMESTAMP_MILLI_SECONDS);
+  code = ws_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "Failed to insert schemaless telnet data, data: %s, ErrCode: 0x%x, ErrMessage: %s\n.", telnet_demo,
+            code, ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+
+  fprintf(stdout, "Insert %d rows of schemaless telnet data successfully.\n", totalLines);
+  ws_free_result(result);
+
+  // opentsdb json protocol
+  char *jsons[1] = {0};
+  // allocate memory for json data. can not use static memory.
+  totalLines = 0;
+  result = ws_schemaless_insert_raw(taos, json_demo, strlen(json_demo), &totalLines, WS_TSDB_SML_JSON_PROTOCOL,
+                                    WS_TSDB_SML_TIMESTAMP_MILLI_SECONDS);
+  code = ws_errno(result);
+  if (code != 0) {
+    free(jsons[0]);
+    fprintf(stderr, "Failed to insert schemaless json data, Server: %s, ErrCode: 0x%x, ErrMessage: %s\n.", json_demo,
+            code, ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+  free(jsons[0]);
+
+  fprintf(stdout, "Insert %d rows of schemaless json data successfully.\n", totalLines);
+  ws_free_result(result);
+
+  // close & clean
+  ws_close(taos);
+  return 0;
+  // ANCHOR_END: schemaless
+}
+
+int main(int argc, char *argv[]) { return DemoSmlInsert(); }

docs/examples/c-ws/stmt_insert_demo.c

@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// TAOS standard API example. The same syntax as MySQL, but only a subset
+// to compile: gcc -o stmt_insert_demo stmt_insert_demo.c -ltaos
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include "taosws.h"
+
+/**
+ * @brief execute sql only.
+ *
+ * @param taos
+ * @param sql
+ */
+void executeSQL(WS_TAOS *taos, const char *sql) {
+  WS_RES *res = ws_query(taos, sql);
+  int     code = ws_errno(res);
+  if (code != 0) {
+    fprintf(stderr, "%s\n", ws_errstr(res));
+    ws_free_result(res);
+    ws_close(taos);
+    exit(EXIT_FAILURE);
+  }
+  ws_free_result(res);
+}
+
+/**
+ * @brief check return status and exit program when error occur.
+ *
+ * @param stmt
+ * @param code
+ * @param msg
+ */
+void checkErrorCode(WS_STMT *stmt, int code, const char *msg) {
+  if (code != 0) {
+    fprintf(stderr, "%s. code: %d, error: %s\n", msg, code, ws_stmt_errstr(stmt));
+    ws_stmt_close(stmt);
+    exit(EXIT_FAILURE);
+  }
+}
+
+typedef struct {
+  int64_t ts;
+  float   current;
+  int     voltage;
+  float   phase;
+} Row;
+
+int num_of_sub_table = 10;
+int num_of_row = 10;
+int total_affected = 0;
+/**
+ * @brief insert data using stmt API
+ *
+ * @param taos
+ */
+void insertData(WS_TAOS *taos) {
+  // init
+  WS_STMT *stmt = ws_stmt_init(taos);
+  if (stmt == NULL) {
+    fprintf(stderr, "Failed to init ws_stmt, error: %s\n", ws_stmt_errstr(NULL));
+    exit(EXIT_FAILURE);
+  }
+  // prepare
+  const char *sql = "INSERT INTO ? USING meters TAGS(?,?) VALUES (?,?,?,?)";
+  int         code = ws_stmt_prepare(stmt, sql, 0);
+  checkErrorCode(stmt, code, "Failed to execute ws_stmt_prepare");
+  for (int i = 1; i <= num_of_sub_table; i++) {
+    char table_name[20];
+    sprintf(table_name, "d_bind_%d", i);
+    char location[20];
+    sprintf(location, "location_%d", i);
+
+    // set table name and tags
+    WS_MULTI_BIND tags[2];
+    // groupId
+    tags[0].buffer_type = TSDB_DATA_TYPE_INT;
+    tags[0].buffer_length = sizeof(int);
+    tags[0].length = (int32_t *)&tags[0].buffer_length;
+    tags[0].buffer = &i;
+    tags[0].is_null = NULL;
+    tags[0].num = 1;
+    // location
+    tags[1].buffer_type = TSDB_DATA_TYPE_BINARY;
+    tags[1].buffer_length = strlen(location);
+    tags[1].length = (int32_t *)&tags[1].buffer_length;
+    tags[1].buffer = location;
+    tags[1].is_null = NULL;
+    tags[1].num = 1;
+    code = ws_stmt_set_tbname_tags(stmt, table_name, tags, 2);
+    checkErrorCode(stmt, code, "Failed to set table name and tags\n");
+
+    // insert rows
+    WS_MULTI_BIND params[4];
+    // ts
+    params[0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[0].buffer_length = sizeof(int64_t);
+    params[0].length = (int32_t *)&params[0].buffer_length;
+    params[0].is_null = NULL;
+    params[0].num = 1;
+    // current
+    params[1].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[1].buffer_length = sizeof(float);
+    params[1].length = (int32_t *)&params[1].buffer_length;
+    params[1].is_null = NULL;
+    params[1].num = 1;
+    // voltage
+    params[2].buffer_type = TSDB_DATA_TYPE_INT;
+    params[2].buffer_length = sizeof(int);
+    params[2].length = (int32_t *)&params[2].buffer_length;
+    params[2].is_null = NULL;
+    params[2].num = 1;
+    // phase
+    params[3].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[3].buffer_length = sizeof(float);
+    params[3].length = (int32_t *)&params[3].buffer_length;
+    params[3].is_null = NULL;
+    params[3].num = 1;
+
+    for (int j = 0; j < num_of_row; j++) {
+      struct timeval tv;
+      gettimeofday(&tv, NULL);
+      long long milliseconds = tv.tv_sec * 1000LL + tv.tv_usec / 1000;  // current timestamp in milliseconds
+      int64_t   ts = milliseconds + j;
+      float     current = (float)rand() / RAND_MAX * 30;
+      int       voltage = rand() % 300;
+      float     phase = (float)rand() / RAND_MAX;
+      params[0].buffer = &ts;
+      params[1].buffer = &current;
+      params[2].buffer = &voltage;
+      params[3].buffer = &phase;
+      // bind param
+      code = ws_stmt_bind_param_batch(stmt, params, 4);
+      checkErrorCode(stmt, code, "Failed to bind param");
+    }
+    // add batch
+    code = ws_stmt_add_batch(stmt);
+    checkErrorCode(stmt, code, "Failed to add batch");
+    // execute batch
+    int affected_rows = 0;
+    code = ws_stmt_execute(stmt, &affected_rows);
+    checkErrorCode(stmt, code, "Failed to exec stmt");
+    // get affected rows
+    int affected = ws_stmt_affected_rows_once(stmt);
+    total_affected += affected;
+  }
+  fprintf(stdout, "Successfully inserted %d rows to power.meters.\n", total_affected);
+  ws_stmt_close(stmt);
+}
+
+int main() {
+  int      code = 0;
+  char    *dsn = "ws://localhost:6041";
+  WS_TAOS *taos = ws_connect(dsn);
+  if (taos == NULL) {
+    fprintf(stderr, "Failed to connect to %s, ErrCode: 0x%x, ErrMessage: %s.\n", dsn, ws_errno(NULL), ws_errstr(NULL));
+    exit(EXIT_FAILURE);
+  }
+  // create database and table
+  executeSQL(taos, "CREATE DATABASE IF NOT EXISTS power");
+  executeSQL(taos, "USE power");
+  executeSQL(taos,
+             "CREATE STABLE IF NOT EXISTS power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS "
+             "(groupId INT, location BINARY(24))");
+  insertData(taos);
+  ws_close(taos);
+}

docs/examples/c-ws/tmq_demo.c

@@ -0,0 +1,488 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// to compile: gcc -o tmq_demo tmq_demo.c -ltaos -lpthread
+
+#include <assert.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include "taosws.h"
+
+volatile int thread_stop = 0;
+static int   running = 1;
+static int   count = 0;
+const char*  topic_name = "topic_meters";
+
+typedef struct {
+  const char* enable_auto_commit;
+  const char* auto_commit_interval_ms;
+  const char* group_id;
+  const char* client_id;
+  const char* td_connect_host;
+  const char* td_connect_port;
+  const char* td_connect_user;
+  const char* td_connect_pass;
+  const char* auto_offset_reset;
+} ConsumerConfig;
+
+ConsumerConfig config = {.enable_auto_commit = "true",
+                         .auto_commit_interval_ms = "1000",
+                         .group_id = "group1",
+                         .client_id = "client1",
+                         .td_connect_host = "localhost",
+                         .td_connect_port = "6030",
+                         .td_connect_user = "root",
+                         .td_connect_pass = "taosdata",
+                         .auto_offset_reset = "latest"};
+
+void* prepare_data(void* arg) {
+  int      code = 0;
+  char*    dsn = "ws://localhost:6041";
+  WS_TAOS* pConn = ws_connect(dsn);
+  if (pConn == NULL) {
+    fprintf(stderr, "Failed to connect to %s, ErrCode: 0x%x, ErrMessage: %s.\n", dsn, ws_errno(NULL), ws_errstr(NULL));
+    return NULL;
+  }
+
+  WS_RES* pRes;
+  int     i = 1;
+
+  while (!thread_stop) {
+    char buf[200] = {0};
+    i++;
+    snprintf(
+        buf, sizeof(buf),
+        "INSERT INTO power.d1001 USING power.meters TAGS(2,'California.SanFrancisco') VALUES (NOW + %da, 10.30000, "
+        "219, 0.31000)",
+        i);
+
+    pRes = ws_query(pConn, buf);
+    code = ws_errno(pRes);
+    if (code != 0) {
+      fprintf(stderr, "Failed to insert data to power.meters, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(pRes));
+    }
+    ws_free_result(pRes);
+    sleep(1);
+  }
+  fprintf(stdout, "Prepare data thread exit\n");
+  return NULL;
+}
+
+// ANCHOR: msg_process
+int32_t msg_process(WS_RES* msg) {
+  int32_t     rows = 0;
+  const char* topicName = ws_tmq_get_topic_name(msg);
+  const char* dbName = ws_tmq_get_db_name(msg);
+  int32_t     vgroupId = ws_tmq_get_vgroup_id(msg);
+
+  while (true) {
+    // get one row data from message
+    WS_ROW row = ws_fetch_row(msg);
+    if (row == NULL) break;
+
+    // Add your data processing logic here
+
+    rows++;
+  }
+
+  return rows;
+}
+// ANCHOR_END: msg_process
+
+WS_TAOS* init_env() {
+  int      code = 0;
+  char*    dsn = "ws://localhost:6041";
+  WS_TAOS* pConn = ws_connect(dsn);
+  if (pConn == NULL) {
+    fprintf(stderr, "Failed to connect to %s, ErrCode: 0x%x, ErrMessage: %s.\n", dsn, ws_errno(NULL), ws_errstr(NULL));
+    return NULL;
+  }
+
+  WS_RES* pRes;
+  // drop database if exists
+  pRes = ws_query(pConn, "DROP TOPIC IF EXISTS topic_meters");
+  code = ws_errno(pRes);
+  if (code != 0) {
+    fprintf(stderr, "Failed to drop topic_meters, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(pRes));
+    goto END;
+  }
+  ws_free_result(pRes);
+
+  pRes = ws_query(pConn, "DROP DATABASE IF EXISTS power");
+  code = ws_errno(pRes);
+  if (code != 0) {
+    fprintf(stderr, "Failed to drop database power, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(pRes));
+    goto END;
+  }
+  ws_free_result(pRes);
+
+  // create database
+  pRes = ws_query(pConn, "CREATE DATABASE power PRECISION 'ms' WAL_RETENTION_PERIOD 3600");
+  code = ws_errno(pRes);
+  if (code != 0) {
+    fprintf(stderr, "Failed to create power, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(pRes));
+    goto END;
+  }
+  ws_free_result(pRes);
+
+  // create super table
+  pRes =
+      ws_query(pConn,
+               "CREATE STABLE IF NOT EXISTS power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS "
+               "(groupId INT, location BINARY(24))");
+  code = ws_errno(pRes);
+  if (code != 0) {
+    fprintf(stderr, "Failed to create super table meters, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(pRes));
+    goto END;
+  }
+  ws_free_result(pRes);
+
+  return pConn;
+
+END:
+  ws_free_result(pRes);
+  ws_close(pConn);
+  return NULL;
+}
+
+void deinit_env(WS_TAOS* pConn) {
+  if (pConn) ws_close(pConn);
+}
+
+int32_t create_topic(WS_TAOS* pConn) {
+  WS_RES* pRes;
+  int     code = 0;
+
+  if (!pConn) {
+    fprintf(stderr, "Invalid input parameter.\n");
+    return -1;
+  }
+
+  pRes = ws_query(pConn, "USE power");
+  code = ws_errno(pRes);
+  if (ws_errno(pRes) != 0) {
+    fprintf(stderr, "Failed to use power, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(pRes));
+    return -1;
+  }
+  ws_free_result(pRes);
+
+  pRes = ws_query(
+      pConn,
+      "CREATE TOPIC IF NOT EXISTS topic_meters AS SELECT ts, current, voltage, phase, groupid, location FROM meters");
+  code = ws_errno(pRes);
+  if (code != 0) {
+    fprintf(stderr, "Failed to create topic topic_meters, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(pRes));
+    return -1;
+  }
+  ws_free_result(pRes);
+  return 0;
+}
+
+int32_t drop_topic(WS_TAOS* pConn) {
+  WS_RES* pRes;
+  int     code = 0;
+
+  if (!pConn) {
+    fprintf(stderr, "Invalid input parameter.\n");
+    return -1;
+  }
+
+  pRes = ws_query(pConn, "USE power");
+  code = ws_errno(pRes);
+  if (ws_errno(pRes) != 0) {
+    fprintf(stderr, "Failed to use power, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(pRes));
+    return -1;
+  }
+  ws_free_result(pRes);
+
+  pRes = ws_query(pConn, "DROP TOPIC IF EXISTS topic_meters");
+  code = ws_errno(pRes);
+  if (code != 0) {
+    fprintf(stderr, "Failed to drop topic topic_meters, ErrCode: 0x%x, ErrMessage: %s.\n", code, ws_errstr(pRes));
+    return -1;
+  }
+  ws_free_result(pRes);
+  return 0;
+}
+
+void tmq_commit_cb_print(ws_tmq_t* tmq, int32_t code, void* param) {
+  count += 1;
+  fprintf(stdout, "tmq_commit_cb_print() code: %d, tmq: %p, param: %p, count: %d.\n", code, tmq, param, count);
+}
+
+// ANCHOR: create_consumer_1
+ws_tmq_t* build_consumer(const ConsumerConfig* config) {
+  ws_tmq_conf_res_t code;
+  ws_tmq_t*         tmq = NULL;
+
+  // create a configuration object
+  ws_tmq_conf_t* conf = ws_tmq_conf_new();
+
+  // set the configuration parameters
+  code = ws_tmq_conf_set(conf, "enable.auto.commit", config->enable_auto_commit);
+  if (WS_TMQ_CONF_OK != code) {
+    ws_tmq_conf_destroy(conf);
+    return NULL;
+  }
+  code = ws_tmq_conf_set(conf, "auto.commit.interval.ms", config->auto_commit_interval_ms);
+  if (WS_TMQ_CONF_OK != code) {
+    ws_tmq_conf_destroy(conf);
+    return NULL;
+  }
+  code = ws_tmq_conf_set(conf, "group.id", config->group_id);
+  if (WS_TMQ_CONF_OK != code) {
+    ws_tmq_conf_destroy(conf);
+    return NULL;
+  }
+  code = ws_tmq_conf_set(conf, "client.id", config->client_id);
+  if (WS_TMQ_CONF_OK != code) {
+    ws_tmq_conf_destroy(conf);
+    return NULL;
+  }
+
+  code = ws_tmq_conf_set(conf, "auto.offset.reset", config->auto_offset_reset);
+  if (WS_TMQ_CONF_OK != code) {
+    ws_tmq_conf_destroy(conf);
+    return NULL;
+  }
+
+  // create a consumer object
+  tmq = ws_tmq_consumer_new(conf, "taos://localhost:6041", NULL, 0);
+
+_end:
+  // destroy the configuration object
+  ws_tmq_conf_destroy(conf);
+  return tmq;
+}
+// ANCHOR_END: create_consumer_1
+
+// ANCHOR: build_topic_list
+// build a topic list used to subscribe
+ws_tmq_list_t* build_topic_list() {
+  // create a empty topic list
+  ws_tmq_list_t* topicList = ws_tmq_list_new();
+
+  // append topic name to the list
+  int32_t code = ws_tmq_list_append(topicList, topic_name);
+  if (code) {
+    // if failed, destroy the list and return NULL
+    ws_tmq_list_destroy(topicList);
+    fprintf(stderr,
+            "Failed to create topic_list, topic: %s, groupId: %s, clientId: %s, ErrCode: 0x%x, ErrMessage: %s.\n",
+            topic_name, config.group_id, config.client_id, code, ws_tmq_errstr(NULL));
+    return NULL;
+  }
+  // if success, return the list
+  return topicList;
+}
+// ANCHOR_END: build_topic_list
+
+// ANCHOR: basic_consume_loop
+void basic_consume_loop(ws_tmq_t* tmq) {
+  int32_t totalRows = 0;   // total rows consumed
+  int32_t msgCnt = 0;      // total messages consumed
+  int32_t timeout = 5000;  // poll timeout
+
+  while (running) {
+    // poll message from TDengine
+    WS_RES* tmqmsg = ws_tmq_consumer_poll(tmq, timeout);
+    if (tmqmsg) {
+      msgCnt++;
+
+      // Add your data processing logic here
+      totalRows += msg_process(tmqmsg);
+
+      // free the message
+      ws_free_result(tmqmsg);
+    }
+    if (msgCnt > 50) {
+      // consume 50 messages and break
+      break;
+    }
+  }
+
+  // print the result: total messages and total rows consumed
+  fprintf(stdout, "%d msg consumed, include %d rows\n", msgCnt, totalRows);
+}
+// ANCHOR_END: basic_consume_loop
+
+// ANCHOR: consume_repeatly
+void consume_repeatly(ws_tmq_t* tmq) {
+  int32_t                  numOfAssignment = 0;
+  ws_tmq_topic_assignment* pAssign = NULL;
+
+  // get the topic assignment
+  int32_t code = ws_tmq_get_topic_assignment(tmq, topic_name, &pAssign, &numOfAssignment);
+  if (code != 0 || pAssign == NULL || numOfAssignment == 0) {
+    fprintf(stderr, "Failed to get assignment, topic: %s, groupId: %s, clientId: %s, ErrCode: 0x%x, ErrMessage: %s.\n",
+            topic_name, config.group_id, config.client_id, code, ws_tmq_errstr(tmq));
+    return;
+  }
+
+  // seek to the earliest offset
+  for (int32_t i = 0; i < numOfAssignment; ++i) {
+    ws_tmq_topic_assignment* p = &pAssign[i];
+
+    code = ws_tmq_offset_seek(tmq, topic_name, p->vgId, p->begin);
+    if (code != 0) {
+      fprintf(stderr,
+              "Failed to seek offset, topic: %s, groupId: %s, clientId: %s, vgId: %d, ErrCode: 0x%x, ErrMessage: %s.\n",
+              topic_name, config.group_id, config.client_id, p->vgId, code, ws_tmq_errstr(tmq));
+      break;
+    }
+  }
+  if (code == 0) fprintf(stdout, "Assignment seek to beginning successfully.\n");
+
+  // free the assignment array
+  ws_tmq_free_assignment(pAssign, numOfAssignment);
+
+  // let's consume the messages again
+  basic_consume_loop(tmq);
+}
+// ANCHOR_END: consume_repeatly
+
+// ANCHOR: manual_commit
+void manual_commit(ws_tmq_t* tmq) {
+  int32_t totalRows = 0;   // total rows consumed
+  int32_t msgCnt = 0;      // total messages consumed
+  int32_t timeout = 5000;  // poll timeout
+
+  while (running) {
+    // poll message from TDengine
+    WS_RES* tmqmsg = ws_tmq_consumer_poll(tmq, timeout);
+    if (tmqmsg) {
+      msgCnt++;
+      // process the message
+      totalRows += msg_process(tmqmsg);
+      // commit the message
+      int32_t code = ws_tmq_commit_sync(tmq, tmqmsg);
+      if (code) {
+        fprintf(stderr,
+                "Failed to commit offset, topic: %s, groupId: %s, clientId: %s, ErrCode: 0x%x, ErrMessage: %s.\n",
+                topic_name, config.group_id, config.client_id, code, ws_tmq_errstr(tmq));
+        // free the message
+        ws_free_result(tmqmsg);
+        break;
+      } else {
+        fprintf(stdout, "Commit offset manually successfully.\n");
+      }
+      // free the message
+      ws_free_result(tmqmsg);
+    }
+    if (msgCnt > 50) {
+      // consume 50 messages and break
+      break;
+    }
+  }
+
+  // print the result: total messages and total rows consumed
+  fprintf(stdout, "%d msg consumed, include %d rows.\n", msgCnt, totalRows);
+}
+// ANCHOR_END: manual_commit
+
+int main(int argc, char* argv[]) {
+  int32_t   code;
+  pthread_t thread_id;
+
+  WS_TAOS* pConn = init_env();
+  if (pConn == NULL) {
+    fprintf(stderr, "Failed to init env.\n");
+    return -1;
+  }
+
+  if (create_topic(pConn) < 0) {
+    fprintf(stderr, "Failed to create topic.\n");
+    return -1;
+  }
+
+  if (pthread_create(&thread_id, NULL, &prepare_data, NULL)) {
+    fprintf(stderr, "Failed to create thread.\n");
+    return -1;
+  }
+
+  // ANCHOR: create_consumer_2
+  ws_tmq_t* tmq = build_consumer(&config);
+  if (NULL == tmq) {
+    fprintf(stderr, "Failed to create native consumer, host: %s, groupId: %s, , clientId: %s.\n",
+            config.td_connect_host, config.group_id, config.client_id);
+    return -1;
+  } else {
+    fprintf(stdout, "Create consumer successfully, host: %s, groupId: %s, clientId: %s.\n", config.td_connect_host,
+            config.group_id, config.client_id);
+  }
+
+  // ANCHOR_END: create_consumer_2
+
+  // ANCHOR: subscribe_3
+  ws_tmq_list_t* topic_list = build_topic_list();
+  if (NULL == topic_list) {
+    fprintf(stderr, "Failed to create topic_list, topic: %s, groupId: %s, clientId: %s.\n", topic_name, config.group_id,
+            config.client_id);
+    return -1;
+  }
+
+  if ((code = ws_tmq_subscribe(tmq, topic_list))) {
+    fprintf(stderr,
+            "Failed to subscribe topic_list, topic: %s, groupId: %s, clientId: %s, ErrCode: 0x%x, ErrMessage: %s.\n",
+            topic_name, config.group_id, config.client_id, code, ws_tmq_errstr(tmq));
+  } else {
+    fprintf(stdout, "Subscribe topics successfully.\n");
+  }
+
+  ws_tmq_list_destroy(topic_list);
+
+  basic_consume_loop(tmq);
+  // ANCHOR_END: subscribe_3
+
+  consume_repeatly(tmq);
+
+  manual_commit(tmq);
+
+  // ANCHOR: unsubscribe_and_close
+  // unsubscribe the topic
+  code = ws_tmq_unsubscribe(tmq);
+  if (code) {
+    fprintf(stderr,
+            "Failed to unsubscribe consumer, topic: %s, groupId: %s, clientId: %s, ErrCode: 0x%x, ErrMessage: %s.\n",
+            topic_name, config.group_id, config.client_id, code, ws_tmq_errstr(tmq));
+  } else {
+    fprintf(stdout, "Consumer unsubscribed successfully.\n");
+  }
+
+  // close the consumer
+  code = ws_tmq_consumer_close(tmq);
+  if (code) {
+    fprintf(stderr, "Failed to close consumer, topic: %s, groupId: %s, clientId: %s, ErrCode: 0x%x, ErrMessage: %s.\n",
+            topic_name, config.group_id, config.client_id, code, ws_tmq_errstr(tmq));
+  } else {
+    fprintf(stdout, "Consumer closed successfully.\n");
+  }
+  // ANCHOR_END: unsubscribe_and_close
+
+  thread_stop = 1;
+  pthread_join(thread_id, NULL);
+
+  if (drop_topic(pConn) < 0) {
+    fprintf(stderr, "Failed to drop topic.\n");
+    return -1;
+  }
+
+  deinit_env(pConn);
+  return 0;
+}

docs/examples/c-ws/with_reqid_demo.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// TAOS standard API example. The same syntax as MySQL, but only a subset
+// to compile: gcc -o with_reqid_demo with_reqid_demo.c -ltaos
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "taosws.h"
+
+static int DemoWithReqId() {
+  // ANCHOR: with_reqid
+  int   code = 0;
+  char *dsn = "ws://localhost:6041";
+
+  // connect
+  WS_TAOS *taos = ws_connect(dsn);
+  if (taos == NULL) {
+    fprintf(stderr, "Failed to connect to %s, ErrCode: 0x%x, ErrMessage: %s.\n", dsn, ws_errno(NULL), ws_errstr(NULL));
+    return -1;
+  }
+
+  const char *sql = "SELECT ts, current, location FROM power.meters limit 1";
+  // query data with reqid
+  long    reqid = 3L;
+  WS_RES *result = ws_query_with_reqid(taos, sql, reqid);
+  code = ws_errno(result);
+  if (code != 0) {
+    fprintf(stderr, "Failed to execute sql withQID: %ld, ErrCode: 0x%x, ErrMessage: %s\n.", reqid, code,
+            ws_errstr(result));
+    ws_close(taos);
+    return -1;
+  }
+
+  WS_ROW          row = NULL;
+  int             rows = 0;
+  int             num_fields = ws_field_count(result);
+  const WS_FIELD *fields = ws_fetch_fields(result);
+
+  fprintf(stdout, "query successfully, got %d fields, the sql is: %s.\n", num_fields, sql);
+
+  // fetch the records row by row
+  while ((row = ws_fetch_row(result))) {
+    // Add your data processing logic here
+
+    rows++;
+  }
+  fprintf(stdout, "total rows: %d\n", rows);
+  ws_free_result(result);
+
+  // close & clean
+  ws_close(taos);
+  return 0;
+  // ANCHOR_END: with_reqid
+}
+
+int main(int argc, char *argv[]) { return DemoWithReqId(); }

docs/examples/c/CMakeLists.txt

@@ -0,0 +1,101 @@
+PROJECT(TDengine)
+
+IF (TD_LINUX)
+  INCLUDE_DIRECTORIES(. ${TD_SOURCE_DIR}/src/inc ${TD_SOURCE_DIR}/src/client/inc  ${TD_SOURCE_DIR}/inc)
+  AUX_SOURCE_DIRECTORY(. SRC)
+
+  add_executable(docs_connect_example "")
+  add_executable(docs_create_db_demo "")
+  add_executable(docs_insert_data_demo "")
+  add_executable(docs_query_data_demo "")
+  add_executable(docs_with_reqid_demo "")
+  add_executable(docs_sml_insert_demo "")
+  add_executable(docs_stmt_insert_demo "")
+  add_executable(docs_tmq_demo "")
+
+  target_sources(docs_connect_example
+      PRIVATE
+      "connect_example.c"
+      )
+
+  target_sources(docs_create_db_demo
+      PRIVATE
+      "create_db_demo.c"
+      )
+
+  target_sources(docs_insert_data_demo
+      PRIVATE
+      "insert_data_demo.c"
+      )
+
+  target_sources(docs_query_data_demo
+    PRIVATE 
+    "query_data_demo.c"
+    )
+    
+  target_sources(docs_with_reqid_demo
+    PRIVATE 
+    "with_reqid_demo.c"
+    )
+
+  target_sources(docs_sml_insert_demo
+    PRIVATE 
+    "sml_insert_demo.c"
+    )
+
+    target_sources(docs_stmt_insert_demo
+    PRIVATE 
+    "stmt_insert_demo.c"
+    )
+
+    target_sources(docs_tmq_demo
+    PRIVATE 
+    "tmq_demo.c"
+    )
+
+  target_link_libraries(docs_connect_example
+      taos
+      )
+
+  target_link_libraries(docs_create_db_demo
+      taos
+      )
+
+  target_link_libraries(docs_insert_data_demo
+      taos
+      )
+
+  target_link_libraries(docs_query_data_demo
+      taos
+      )
+  
+  target_link_libraries(docs_with_reqid_demo
+      taos
+      )
+
+  target_link_libraries(docs_sml_insert_demo
+      taos
+      )
+
+  target_link_libraries(docs_stmt_insert_demo
+      taos
+      )
+
+  target_link_libraries(docs_tmq_demo
+      taos
+      pthread
+      )
+
+  SET_TARGET_PROPERTIES(docs_connect_example PROPERTIES OUTPUT_NAME docs_connect_example)
+  SET_TARGET_PROPERTIES(docs_create_db_demo PROPERTIES OUTPUT_NAME docs_create_db_demo)
+  SET_TARGET_PROPERTIES(docs_insert_data_demo PROPERTIES OUTPUT_NAME docs_insert_data_demo)
+  SET_TARGET_PROPERTIES(docs_query_data_demo PROPERTIES OUTPUT_NAME docs_query_data_demo)
+  SET_TARGET_PROPERTIES(docs_with_reqid_demo PROPERTIES OUTPUT_NAME docs_with_reqid_demo)
+  SET_TARGET_PROPERTIES(docs_sml_insert_demo PROPERTIES OUTPUT_NAME docs_sml_insert_demo)
+  SET_TARGET_PROPERTIES(docs_stmt_insert_demo PROPERTIES OUTPUT_NAME docs_stmt_insert_demo)
+  SET_TARGET_PROPERTIES(docs_tmq_demo PROPERTIES OUTPUT_NAME docs_tmq_demo)
+ENDIF ()
+IF (TD_DARWIN)
+  INCLUDE_DIRECTORIES(. ${TD_SOURCE_DIR}/src/inc ${TD_SOURCE_DIR}/src/client/inc  ${TD_SOURCE_DIR}/inc)
+  AUX_SOURCE_DIRECTORY(. SRC)
+ENDIF ()

docs/examples/c/Makefile

@@ -0,0 +1,34 @@
+# Makefile for building TDengine examples on TD Linux platform
+
+INCLUDE_DIRS = 
+
+TARGETS = connect_example       \
+          create_db_demo        \
+          insert_data_demo      \
+          query_data_demo       \
+          with_reqid_demo       \
+          sml_insert_demo       \
+          stmt_insert_demo      \
+          tmq_demo
+
+SOURCES = connect_example.c     \
+          create_db_demo.c      \
+          insert_data_demo.c    \
+          query_data_demo.c     \
+          with_reqid_demo.c     \
+          sml_insert_demo.c     \
+          stmt_insert_demo.c    \
+          tmq_demo.c
+
+LIBS = -ltaos -lpthread
+
+
+CFLAGS = -g
+
+all: $(TARGETS)
+
+$(TARGETS):
+	$(CC) $(CFLAGS) -o $@ $(wildcard $(@F).c) $(LIBS)
+
+clean:
+	rm -f $(TARGETS)

docs/examples/node/package.json

@@ -4,7 +4,6 @@
   "main": "index.js",
   "license": "MIT",
   "dependencies": {
-    "@tdengine/client": "^3.0.1",
-    "@tdengine/rest": "^3.0.0"
+    "@tdengine/websocket": "^3.1.0"
   }
 }

docs/examples/node/websocketexample/all_type_query.js

@@ -34,6 +34,7 @@ async function json_tag_example() {
 
     } catch (err) {
         console.error(`Failed to create database example_json_tag or stable stb, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     } finally {
         if (wsSql) {
             await wsSql.close();
@@ -78,9 +79,10 @@ async function all_type_example() {
             let row = wsRows.getData();
             console.log(row);
         }
-
+        
     } catch (err) {
         console.error(`Failed to create database all_type_example or stable stb, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     } finally {
         if (wsSql) {
             await wsSql.close();
@@ -91,7 +93,7 @@ async function all_type_example() {
 
 async function test() {
     await json_tag_example()
-    await all_type_example()
+    await all_type_example()        
     taos.destroy();
 }
 

docs/examples/node/websocketexample/all_type_stmt.js

@@ -46,6 +46,7 @@ async function json_tag_example() {
 
     } catch (err) {
         console.error(`Failed to create database example_json_tag or stable stb, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err
     } finally {
         if (wsSql) {
             await wsSql.close();
@@ -125,6 +126,7 @@ async function all_type_example() {
 
     } catch (err) {
         console.error(`Failed to create database all_type_example or stable stb, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     } finally {
         if (stmt) {
             await stmt.close();
@@ -136,10 +138,7 @@ async function all_type_example() {
 
 }
 
-
-
-async function test() {
-    taos.setLevel("debug")
+async function test() { 
     await json_tag_example()
     await all_type_example()
     taos.destroy();

docs/examples/node/websocketexample/json_line_example.js

@@ -1,53 +0,0 @@
-const taos = require("@tdengine/websocket");
-
-var host = null;
-for(var i = 2; i < global.process.argv.length; i++){
-  var key = global.process.argv[i].split("=")[0];
-  var value = global.process.argv[i].split("=")[1];
-  if("host" == key){
-    host = value;
-  }
-}
-
-if(host == null){
-    console.log("Usage: node nodejsChecker.js host=<hostname> port=<port>");
-    process.exit(0);
-  }
-
-let dbData = ["{\"metric\": \"meter_current\",\"timestamp\": 1626846402,\"value\": 10.3, \"tags\": {\"groupid\": 2, \"location\": \"California.SanFrancisco\", \"id\": \"d1001\"}}",
-              "{\"metric\": \"meter_current\",\"timestamp\": 1626846403,\"value\": 10.3, \"tags\": {\"groupid\": 2, \"location\": \"California.SanFrancisco\", \"id\": \"d1002\"}}",
-              "{\"metric\": \"meter_current\",\"timestamp\": 1626846404,\"value\": 10.3, \"tags\": {\"groupid\": 2, \"location\": \"California.SanFrancisco\", \"id\": \"d1003\"}}"]
-
-async function createConnect() {
-    let dsn = 'ws://' + host + ':6041'
-    let conf = new taos.WSConfig(dsn);
-    conf.setUser('root');
-    conf.setPwd('taosdata');
-    conf.setDb('power');
-    return await taos.sqlConnect(conf);
-}
-
-async function test() {
-    let wsSql = null;
-    let wsRows = null;
-    let reqId = 0;
-    try {
-        wsSql = await createConnect()
-        await wsSql.exec('CREATE DATABASE IF NOT EXISTS power KEEP 3650 DURATION 10 BUFFER 16 WAL_LEVEL 1;', reqId++);
-        await wsSql.schemalessInsert([dbData], taos.SchemalessProto.OpenTSDBJsonFormatProtocol, taos.Precision.SECONDS, 0);
-    }
-    catch (err) {
-        console.error(err.code, err.message);
-    }
-    finally {
-        if (wsRows) {
-            await wsRows.close();
-        }
-        if (wsSql) {
-            await wsSql.close();
-        }
-        taos.destroy();
-    }
-}
-
-test()

docs/examples/node/websocketexample/line_example.js

@@ -15,8 +15,8 @@ async function createConnect() {
     return wsSql;
 }
 
+
 async function test() {
-    let dsn = 'ws://localhost:6041'
     let wsSql = null;
     let wsRows = null;
     let ttl = 0;
@@ -29,6 +29,7 @@ async function test() {
     }
     catch (err) {
         console.error(`Failed to insert data with schemaless, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     }
     finally {
         if (wsRows) {
@@ -40,4 +41,5 @@ async function test() {
         taos.destroy();
     }
 }
+
 test()

docs/examples/node/websocketexample/nodejsChecker.js

@@ -10,11 +10,9 @@ for(var i = 2; i < global.process.argv.length; i++){
 }
 
 if(host == null){
-    console.log("Usage: node nodejsChecker.js host=<hostname> port=<port>");
-    process.exit(0);
+    host = 'localhost';
 }
 
-
 async function createConnect() {
     let dsn = 'ws://' + host + ':6041'
     console.log(dsn)
@@ -41,7 +39,7 @@ async function test() {
         taosResult = await wsSql.exec('USE power', reqId++);
         console.log(taosResult);
 
-        taosResult = await wsSql.exec('CREATE STABLE IF NOT EXISTS meters (_ts timestamp, current float, voltage int, phase float) TAGS (location binary(64), groupId int);', reqId++);
+        taosResult = await wsSql.exec('CREATE STABLE IF NOT EXISTS meters (ts timestamp, current float, voltage int, phase float) TAGS (location binary(64), groupId int);', reqId++);
         console.log(taosResult);
 
         taosResult = await wsSql.exec('DESCRIBE meters', reqId++);
@@ -62,6 +60,7 @@ async function test() {
     }
     catch (err) {
         console.error(err.code, err.message);
+        throw err;
     }
     finally {
         if (wsRows) {

docs/examples/node/websocketexample/sql_example.js

@@ -41,6 +41,7 @@ async function createDbAndTable() {
         console.log("Create stable power.meters successfully");
     } catch (err) {
         console.error(`Failed to create database power or stable meters, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     } finally {
         if (wsSql) {
             await wsSql.close();
@@ -53,21 +54,23 @@ async function createDbAndTable() {
 // ANCHOR: insertData
 async function insertData() {
     let wsSql = null
+    let insertQuery = "INSERT INTO " +
+        "power.d1001 USING power.meters (location, groupId) TAGS('California.SanFrancisco', 2) " +
+        "VALUES " +
+        "(NOW + 1a, 10.30000, 219, 0.31000) " +
+        "(NOW + 2a, 12.60000, 218, 0.33000) " +
+        "(NOW + 3a, 12.30000, 221, 0.31000) " +
+        "power.d1002 USING power.meters (location, groupId) TAGS('California.SanFrancisco', 3) " +
+        "VALUES " +
+        "(NOW + 1a, 10.30000, 218, 0.25000) "; 
+
     try {
         wsSql = await createConnect();
-        let insertQuery = "INSERT INTO " +
-            "power.d1001 USING power.meters (location, groupId) TAGS('California.SanFrancisco', 2) " +
-            "VALUES " +
-            "(NOW + 1a, 10.30000, 219, 0.31000) " +
-            "(NOW + 2a, 12.60000, 218, 0.33000) " +
-            "(NOW + 3a, 12.30000, 221, 0.31000) " +
-            "power.d1002 USING power.meters TAGS('California.SanFrancisco', 3) " +
-            "VALUES " +
-            "(NOW + 1a, 10.30000, 218, 0.25000) ";
         taosResult = await wsSql.exec(insertQuery);
         console.log("Successfully inserted " + taosResult.getAffectRows() + " rows to power.meters.");
     } catch (err) {
         console.error(`Failed to insert data to power.meters, sql: ${insertQuery}, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     } finally {
         if (wsSql) {
             await wsSql.close();
@@ -91,6 +94,7 @@ async function queryData() {
     }
     catch (err) {
         console.error(`Failed to query data from power.meters, sql: ${sql}, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     }
     finally {
         if (wsRows) {
@@ -118,6 +122,7 @@ async function sqlWithReqid() {
     }
     catch (err) {
         console.error(`Failed to query data from power.meters, reqId: ${reqId}, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     }
     finally {
         if (wsRows) {
@@ -135,7 +140,7 @@ async function test() {
     await insertData();
     await queryData();
     await sqlWithReqid();
-    taos.destroy();
+    taos.destroy();    
 }
 
 test()

docs/examples/node/websocketexample/stmt_example.js

@@ -23,7 +23,7 @@ async function prepare() {
     return wsSql
 }
 
-(async () => {
+async function test() {
     let stmt = null;
     let connector = null;
     try {
@@ -60,6 +60,7 @@ async function prepare() {
     }
     catch (err) {
         console.error(`Failed to insert to table meters using stmt, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     }
     finally {
         if (stmt) {
@@ -70,4 +71,6 @@ async function prepare() {
         }
         taos.destroy();
     }
-})();
+}
+
+test()

docs/examples/node/websocketexample/telnet_line_example.js

@@ -1,58 +0,0 @@
-const taos = require("@tdengine/websocket");
-
-var host = null;
-for(var i = 2; i < global.process.argv.length; i++){
-  var key = global.process.argv[i].split("=")[0];
-  var value = global.process.argv[i].split("=")[1];
-  if("host" == key){
-    host = value;
-  }
-}
-
-if(host == null){
-    console.log("Usage: node nodejsChecker.js host=<hostname> port=<port>");
-    process.exit(0);
-  }
-
-  let dbData = ["meters.current 1648432611249 10.3 location=California.SanFrancisco groupid=2",
-  "meters.current 1648432611250 12.6 location=California.SanFrancisco groupid=2",
-  "meters.current 1648432611249 10.8 location=California.LosAngeles groupid=3",
-  "meters.current 1648432611250 11.3 location=California.LosAngeles groupid=3",
-  "meters.voltage 1648432611249 219 location=California.SanFrancisco groupid=2",
-  "meters.voltage 1648432611250 218 location=California.SanFrancisco groupid=2",
-  "meters.voltage 1648432611249 221 location=California.LosAngeles groupid=3",
-  "meters.voltage 1648432611250 217 location=California.LosAngeles groupid=3",];
-
-async function createConnect() {
-    let dsn = 'ws://' + host + ':6041'
-    let conf = new taos.WSConfig(dsn);
-    conf.setUser('root');
-    conf.setPwd('taosdata');
-
-    return await taos.sqlConnect(conf);
-}
-
-async function test() {
-    let wsSql = null;
-    let wsRows = null;
-    let reqId = 0;
-    try {
-        wsSql = await createConnect()
-        await wsSql.exec('create database if not exists power KEEP 3650 DURATION 10 BUFFER 16 WAL_LEVEL 1;', reqId++);
-        await wsSql.exec('use power', reqId++);
-        await wsSql.schemalessInsert(dbData, taos.SchemalessProto.OpenTSDBTelnetLineProtocol, taos.Precision.MILLI_SECONDS, 0);
-    }
-    catch (err) {
-        console.error(err.code, err.message);
-    }
-    finally {
-        if (wsRows) {
-            await wsRows.close();
-        }
-        if (wsSql) {
-            await wsSql.close();
-        }
-        taos.destroy();
-    }
-}
-test()

docs/examples/node/websocketexample/tmq_example.js

@@ -1,3 +1,4 @@
+const { sleep } = require("@tdengine/websocket");
 const taos = require("@tdengine/websocket");
 
 // ANCHOR: create_consumer
@@ -49,12 +50,20 @@ async function prepare() {
 
     let createTopic = `CREATE TOPIC IF NOT EXISTS ${topics[0]} AS SELECT * FROM ${db}.${stable}`;
     await wsSql.exec(createTopic);
+    await wsSql.close();
+}
 
-
-    for (let i = 0; i < 10; i++) {
+async function insert() {
+    let conf = new taos.WSConfig('ws://localhost:6041');
+    conf.setUser('root');
+    conf.setPwd('taosdata');
+    conf.setDb('power');
+    let wsSql = await taos.sqlConnect(conf);
+    for (let i = 0; i < 50; i++) {
         await wsSql.exec(`INSERT INTO d1001 USING ${stable} (location, groupId) TAGS ("California.SanFrancisco", 3) VALUES (NOW, ${10 + i}, ${200 + i}, ${0.32 + i})`);
+        await sleep(100);
     }
-    wsSql.close();
+    await wsSql.close();
 }
 
 async function subscribe(consumer) {
@@ -82,13 +91,17 @@ async function test() {
     let consumer = null;
     try {
         await prepare();
-        consumer = await createConsumer()
-        await subscribe(consumer)
+        consumer = await createConsumer();
+        const allPromises = [];
+        allPromises.push(subscribe(consumer));
+        allPromises.push(insert());
+        await Promise.all(allPromises);
         await consumer.unsubscribe();
         console.log("Consumer unsubscribed successfully.");
     }
     catch (err) {
         console.error(`Failed to unsubscribe consumer, topic: ${topic}, groupId: ${groupId}, clientId: ${clientId}, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     }
     finally {
         if (consumer) {

docs/examples/node/websocketexample/tmq_seek_example.js

@@ -1,41 +1,45 @@
+const { sleep } = require("@tdengine/websocket");
 const taos = require("@tdengine/websocket");
 
 const db = 'power';
 const stable = 'meters';
+const url = 'ws://localhost:6041';
 const topic = 'topic_meters'
 const topics = [topic];
 const groupId = "group1";
 const clientId = "client1";
 
-
-// ANCHOR: create_consumer
 async function createConsumer() {
+
+    let groupId = "group1";
+    let clientId = "client1";
     let configMap = new Map([
-        [taos.TMQConstants.GROUP_ID, "group1"],
-        [taos.TMQConstants.CLIENT_ID, 'client1'],
+        [taos.TMQConstants.GROUP_ID, groupId],
+        [taos.TMQConstants.CLIENT_ID, clientId],
         [taos.TMQConstants.CONNECT_USER, "root"],
         [taos.TMQConstants.CONNECT_PASS, "taosdata"],
         [taos.TMQConstants.AUTO_OFFSET_RESET, "latest"],
-        [taos.TMQConstants.WS_URL, 'ws://localhost:6041'],
+        [taos.TMQConstants.WS_URL, url],
         [taos.TMQConstants.ENABLE_AUTO_COMMIT, 'true'],
         [taos.TMQConstants.AUTO_COMMIT_INTERVAL_MS, '1000']
     ]);
     try {
-        return await taos.tmqConnect(configMap);
+        conn = await taos.tmqConnect(configMap);
+        console.log(`Create consumer successfully, host: ${url}, groupId: ${groupId}, clientId: ${clientId}`)
+        return conn;
     } catch (err) {
-        console.error(err);
+        console.error(`Failed to create websocket consumer, topic: ${topic}, groupId: ${groupId}, clientId: ${clientId}, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
         throw err;
     }
 
 }
-// ANCHOR_END: create_consumer 
 
 async function prepare() {
-    let conf = new taos.WSConfig('ws://localhost:6041');
+    let conf = new taos.WSConfig('ws://192.168.1.98:6041');
     conf.setUser('root');
     conf.setPwd('taosdata');
     conf.setDb('power');
-    const createDB = `CREATE DATABASE IF NOT EXISTS ${db} KEEP 3650 DURATION 10 BUFFER 16 WAL_LEVEL 1;`;
+    const createDB = `CREATE DATABASE IF NOT EXISTS ${db}`;
     const createStable = `CREATE STABLE IF NOT EXISTS ${db}.${stable} (ts timestamp, current float, voltage int, phase float) TAGS (location binary(64), groupId int);`;
 
     let wsSql = await taos.sqlConnect(conf);
@@ -44,58 +48,63 @@ async function prepare() {
 
     let createTopic = `CREATE TOPIC IF NOT EXISTS ${topics[0]} AS SELECT * FROM ${db}.${stable}`;
     await wsSql.exec(createTopic);
+    await wsSql.close();
+}
 
-
-    for (let i = 0; i < 10; i++) {
+async function insert() {
+    let conf = new taos.WSConfig('ws://localhost:6041');
+    conf.setUser('root');
+    conf.setPwd('taosdata');
+    conf.setDb('power');
+    let wsSql = await taos.sqlConnect(conf);
+    for (let i = 0; i < 1; i++) {
         await wsSql.exec(`INSERT INTO d1001 USING ${stable} (location, groupId) TAGS ("California.SanFrancisco", 3) VALUES (NOW, ${10 + i}, ${200 + i}, ${0.32 + i})`);
     }
     await wsSql.close();
 }
 
-// ANCHOR: subscribe 
+// ANCHOR: offset 
 async function subscribe(consumer) {
     try {
-        await consumer.subscribe(['topic_meters']);
-        for (let i = 0; i < 50; i++) {
-            let res = await consumer.poll(100);
-            for (let [key, value] of res) {
-                // Add your data processing logic here
-                console.log(`data: ${key} ${value}`);
-            }
-        }
-    } catch (err) {
-        console.error(`Failed to poll data, topic: ${topic}, groupId: ${groupId}, clientId: ${clientId}, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
-        throw err;
-    }
-
-}
-// ANCHOR_END: subscribe
-
-// ANCHOR: offset 
-async function test() {
-    let consumer = null;
-    try {
-        await prepare();
-        let consumer = await createConsumer()
         await consumer.subscribe(['topic_meters']);
         let res = new Map();
         while (res.size == 0) {
             res = await consumer.poll(100);
+            await consumer.commit();
         }
-
         let assignment = await consumer.assignment();
         await consumer.seekToBeginning(assignment);
         console.log("Assignment seek to beginning successfully");
+    } catch (err) {
+        console.error(`Failed to seek offset, topic: ${topic}, groupId: ${groupId}, clientId: ${clientId}, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
+    }
+}
+// ANCHOR_END: offset 
+
+async function test() {
+    let consumer = null;
+    try {
+        await prepare();
+        consumer = await createConsumer();
+        const allPromises = [];
+        allPromises.push(subscribe(consumer));
+        allPromises.push(insert());
+        await Promise.all(allPromises);
+        await consumer.unsubscribe();
+        console.log("Consumer unsubscribed successfully.");
     }
     catch (err) {
-        console.error(`Failed to seek offset, topic: ${topic}, groupId: ${groupId}, clientId: ${clientId}, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        console.error(`Failed to consumer, topic: ${topic}, groupId: ${groupId}, clientId: ${clientId}, ErrCode: ${err.code}, ErrMessage: ${err.message}`);
+        throw err;
     }
     finally {
         if (consumer) {
             await consumer.close();
+            console.log("Consumer closed successfully.");
         }
         taos.destroy();
     }
 }
-// ANCHOR_END: offset 
+
 test()

docs/examples/python/connect_example.py

@@ -15,6 +15,7 @@ def create_connection():
         print(f"Connected to {host}:{port} successfully.");
     except Exception as err:
         print(f"Failed to connect to {host}:{port} , ErrMessage:{err}")
+        raise err
     finally:
         if conn:
             conn.close()

docs/examples/python/connect_websocket_examples.py

@@ -15,7 +15,7 @@ def create_connection():
         print(f"Connected to {host}:{port} successfully.");
     except Exception as err:
         print(f"Failed to connect to {host}:{port} , ErrMessage:{err}")
-   
+        raise err
     return conn
  # ANCHOR_END: connect
 
@@ -28,6 +28,7 @@ def create_db_table(conn):
         conn.execute("CREATE TABLE  IF NOT EXISTS `d0` USING `meters` (groupId, location) TAGS(0, 'Los Angles')")
     except Exception as err:
         print(f'Exception {err}')
+        raise err
 # ANCHOR_END: create_db
 
 def insert(conn):
@@ -42,9 +43,10 @@ def insert(conn):
     """
     try:
         inserted = conn.execute(sql)
-        assert inserted == 8
+        assert inserted == 4
     except Exception as err:
         print(f'Exception111 {err}')
+        raise err
 # ANCHOR_END: insert
 
 def query(conn):
@@ -58,6 +60,7 @@ def query(conn):
             print(row)
     except Exception as err:
         print(f'Exception {err}')
+        raise err
 # ANCHOR_END: query
 
 if __name__ == "__main__":

docs/examples/python/create_db_native.py

@@ -21,6 +21,7 @@ try:
 
 except Exception as err:
     print(f"Failed to create database power or stable meters, ErrMessage:{err}") 
+    raise err
 finally:
     if conn:
         conn.close()       

docs/examples/python/create_db_rest.py

@@ -20,6 +20,7 @@ try:
 
 except Exception as err:
     print(f"Failed to create database power or stable meters, ErrMessage:{err}") 
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/create_db_ws.py

@@ -21,6 +21,7 @@ try:
 
 except Exception as err:
     print(f"Failed to create database power or stable meters, ErrMessage:{err}") 
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/insert_native.py

@@ -22,6 +22,7 @@ try:
 
 except Exception as err:
     print(f"Failed to insert data to power.meters, sql: {sql}, ErrMessage: {err}.")
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/insert_rest.py

@@ -21,6 +21,7 @@ try:
 
 except Exception as err:
     print(f"Failed to insert data to power.meters, sql:{sql}, ErrMessage:{err}.")
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/insert_ws.py

@@ -22,6 +22,7 @@ try:
 
 except Exception as err:
     print(f"Failed to insert data to power.meters, sql: {sql}, ErrMessage: {err}.")
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/query_native.py

@@ -16,6 +16,7 @@ try:
 
 except Exception as err:
     print(f"Failed to query data from power.meters, sql: {sql}, ErrMessage:{err}")
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/query_rest.py

@@ -15,3 +15,4 @@ try:
 
 except Exception as err:
     print(f"Failed to query data from power.meters, sql: {sql}, ErrMessage:{err}")
+    raise err

docs/examples/python/query_ws.py

@@ -15,6 +15,7 @@ try:
 
 except Exception as err:
     print(f"Failed to query data from power.meters, sql: {sql}, ErrMessage:{err}")
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/reqid_native.py

@@ -18,7 +18,7 @@ try:
 
 except Exception as err:
     print(f"Failed to execute sql with reqId:{reqId}, ErrMessage:{err}")
-    
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/reqid_rest.py

@@ -16,3 +16,4 @@ try:
 
 except Exception as err:
     print(f"Failed to execute sql with reqId:{reqId}, ErrMessage:{err}")
+    raise err

docs/examples/python/reqid_ws.py

@@ -19,6 +19,7 @@ try:
 
 except Exception as err:
     print(f"Failed to execute sql with reqId:{reqId}, ErrMessage:{err}")
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/schemaless_native.py

@@ -35,6 +35,7 @@ try:
     print("Inserted data with schemaless successfully.");
 except Exception as err:
     print(f"Failed to insert data with schemaless, ErrMessage:{err}")
+    raise err
 finally:
     if conn:
         conn.close()

docs/examples/python/schemaless_ws.py

@@ -75,8 +75,6 @@ def schemaless_insert():
             conn.close()
 
 if __name__ == "__main__":
-    try:
-        prepare()
-        schemaless_insert()
-    except Exception as err:
-          print(f"Failed to insert data with schemaless, err:{err}")   
+    prepare()
+    schemaless_insert()
+  

docs/examples/python/stmt_native.py

@@ -57,6 +57,7 @@ try:
 
 except Exception as err:
     print(f"Failed to insert to table meters using stmt, ErrMessage:{err}") 
+    raise err
 finally:
     if stmt:
         stmt.close()

docs/examples/python/stmt_ws.py

@@ -62,6 +62,7 @@ try:
         
 except Exception as err:
     print(f"Failed to insert to table meters using stmt, ErrMessage:{err}") 
+    raise err
 finally:
     if stmt:
         stmt.close()

docs/examples/python/tmq_native.py

@@ -152,6 +152,7 @@ def unsubscribe(consumer):
         print("Consumer unsubscribed successfully.");
     except Exception as err:
         print(f"Failed to unsubscribe consumer. topic: {topic}, groupId: {groupId}, clientId: {clientId}, ErrMessage:{err}.")
+        raise err
     finally:
         if consumer:
             consumer.close()
@@ -166,7 +167,6 @@ if __name__ == "__main__":
         subscribe(consumer)
         seek_offset(consumer)
         commit_offset(consumer)
-    except Exception as err:
-        print(f"Failed to execute consumer example, topic: {topic}, groupId: {groupId}, clientId: {clientId}, ErrMessage:{err}.")
     finally:
-        unsubscribe(consumer);
+        if consumer:
+            unsubscribe(consumer);

docs/examples/python/tmq_websocket_example.py

@@ -31,7 +31,7 @@ def prepareMeta():
 
         # create super table
         rowsAffected = conn.execute(
-            "CREATE TABLE IF NOT EXISTS `meters` (`ts` TIMESTAMP, `current` FLOAT, `voltage` INT, `phase` FLOAT) TAGS (`groupid` INT, `location` BINARY(16))"
+            "CREATE TABLE IF NOT EXISTS `meters` (`ts` TIMESTAMP, `current` FLOAT, `voltage` INT, `phase` FLOAT) TAGS (`groupid` INT, `location` BINARY(64))"
         )
         assert rowsAffected == 0
 
@@ -155,6 +155,7 @@ def unsubscribe(consumer):
         print("Consumer unsubscribed successfully.");
     except Exception as err:
         print(f"Failed to unsubscribe consumer. topic: {topic}, groupId: {groupId}, clientId: {clientId}, ErrMessage:{err}.")
+        raise err
     finally:
         if consumer:
             consumer.close()
@@ -170,7 +171,6 @@ if __name__ == "__main__":
         subscribe(consumer)
         seek_offset(consumer)
         commit_offset(consumer)      
-    except Exception as err:
-        print(f"Failed to execute consumer example, topic: {topic}, groupId: {groupId}, clientId: {clientId}, ErrMessage:{err}.")
     finally:
-        unsubscribe(consumer)
+        if consumer:
+            unsubscribe(consumer)

docs/examples/rust/restexample/examples/tmq.rs

@@ -83,7 +83,6 @@ async fn main() -> anyhow::Result<()> {
                     eprintln!("Failed to execute insert: {:?}", e);
                 }
                 tokio::time::sleep(Duration::from_millis(10)).await;
-                println!("Succed to execute insert 1 row");
             }
         });
     });

docs/zh/05-basic/03-query.md

@@ -181,7 +181,7 @@ INTERVAL(interval_val [, interval_offset])
 - FILL：用于指定窗口区间数据缺失的情况下，数据的填充模式。
 
 对于时间窗口，interval_val 和 sliding_val 都表示时间段， 语法上支持三种方式。例如：
-1. INTERVAL(1s, 500a) SLIDING(1s)，带时间单位的形式，其中的时间单位是单字符表示， 分别为： a （毫秒）， b （纳秒）， d （天）， h （小时）， m （分钟）， n （月）， s （秒）， u （微妙）， w （周）， y （年）；
+1. INTERVAL(1s, 500a) SLIDING(1s)，带时间单位的形式，其中的时间单位是单字符表示， 分别为： a （毫秒）， b （纳秒）， d （天）， h （小时）， m （分钟）， n （月）， s （秒）， u （微秒）， w （周）， y （年）；
 2. INTERVAL(1000, 500) SLIDING(1000)，不带时间单位的形式，将使用查询库的时间精度作为默认时间单位，当存在多个库时默认采用精度更高的库；
 3. INTERVAL('1s', '500a') SLIDING('1s')，带时间单位的字符串形式，字符串内部不能有任何空格等其它字符。
 

docs/zh/06-advanced/05-data-in/03-pi.md

@@ -27,7 +27,7 @@ PI 系统是一套用于数据收集、查找、分析、传递和可视化的
 
 在数据写入页面中，点击 **+新增数据源** 按钮，进入新增数据源页面。
 
-![kafka-01.png](./kafka-01.png)
+![new.png](./pic/pi-01-new.png)
 
 ### 基本配置
 

docs/zh/06-advanced/05-data-in/05-opcua.md

@@ -208,3 +208,15 @@ CSV 文件中的每个 Row 配置一个 OPC 数据点位。Row 的规则如下
 ### 8. 创建完成
 
 点击 **提交** 按钮，完成创建 OPC UA 到 TDengine 的数据同步任务，回到**数据源列表**页面可查看任务执行情况。
+
+## 增加数据点位
+
+在任务运行中，点击 **编辑**，点击 **增加数据点位** 按钮，追加数据点位到 CSV 文件中。
+
+![增加数据点位](./pic/opc-08-add-point.png)
+
+在弹出的表单中，填写数据点位的信息。
+
+![数据点位表单](./pic/opc-09-add-point.png)
+
+点击 **确定** 按钮，完成数据点位的追加。

docs/zh/06-advanced/05-data-in/06-opcda.md

@@ -182,3 +182,15 @@ CSV 文件中的每个 Row 配置一个 OPC 数据点位。Row 的规则如下
 ### 7. 创建完成
 
 点击 **提交** 按钮，完成创建 OPC DA 到 TDengine 的数据同步任务，回到**数据源列表**页面可查看任务执行情况。
+
+## 增加数据点位
+
+在任务运行中，点击 **编辑**，点击 **增加数据点位** 按钮，追加数据点位到 CSV 文件中。
+
+![增加数据点位](./pic/opc-08-add-point.png)
+
+在弹出的表单中，填写数据点位的信息。
+
+![数据点位表单](./pic/opc-09-add-point.png)
+
+点击 **确定** 按钮，完成数据点位的追加。

docs/zh/06-advanced/05-data-in/07-mqtt.md

@@ -33,13 +33,14 @@ TDengine 可以通过 MQTT 连接器从 MQTT 代理订阅数据并将其写入 T
 
 ### 3. 配置连接和认证信息
 
-在 **MQTT地址** 中填写 MQTT 代理的地址，例如：`192.168.1.42:1883`
+在 **MQTT 地址** 中填写 MQTT 代理的地址，例如：`192.168.1.42`
+
+在 **MQTT 端口** 中填写 MQTT 代理的端口，例如：`1883`
 
 在 **用户** 中填写 MQTT 代理的用户名。
 
 在 **密码** 中填写 MQTT 代理的密码。
 
-点击 **连通性检查** 按钮，检查数据源是否可用。
 
 ![mqtt-03.png](./mqtt-03.png)
 
@@ -64,6 +65,8 @@ TDengine 可以通过 MQTT 连接器从 MQTT 代理订阅数据并将其写入 T
 
 在 **订阅主题及 QoS 配置** 中填写要消费的 Topic 名称。使用如下格式设置： `topic1::0,topic2::1`。
 
+点击 **检查连通性** 按钮，检查数据源是否可用。
+
 ![mqtt-05.png](./mqtt-05.png)
 
 ### 6. 配置 MQTT Payload 解析

docs/zh/06-advanced/05-data-in/08-kafka.md

@@ -44,8 +44,50 @@ TDengine 可以高效地从 Kafka 读取数据并将其写入 TDengine，以实
 
 如果服务端开启了 SASL 认证机制，此处需要启用 SASL 并配置相关内容，目前支持 PLAIN/SCRAM-SHA-256/GSSAPI 三种认证机制，请按实际情况进行选择。
 
+#### 4.1. PLAIN 认证
+
+选择 `PLAIN` 认证机制，输入用户名和密码：
+
+![kafka-04-sasl-plain.png](./kafka-04-sasl-plain.png)
+
+#### 4.1. SCRAM(SCRAM-SHA-256) 认证
+
+选择 `SCRAM-SHA-256` 认证机制，输入用户名和密码：
+
 ![kafka-04.png](./kafka-04.png)
 
+#### 4.3. GSSAPI 认证
+
+选择 `GSSAPI` ，将通过 [RDkafka 客户端](https://github.com/confluentinc/librdkafka) 调用 GSSAPI 应用 Kerberos 认证机制：
+
+![kafka-04-sasl-gssapi.png](./kafka-04-sasl-gssapi.png)
+
+需要输入的信息有：
+
+- Kerberos 服务名，一般是 `kafka`；
+- Kerberos 认证主体，即认证用户名，例如 `kafkaclient`；
+- Kerberos 初始化命令（可选，一般不用填写）；
+- Kerberos 密钥表，需提供文件并上传；
+
+以上信息均需由 Kafka 服务管理者提供。
+
+除此之外，在服务器上需要配置 [Kerberos](https://web.mit.edu/kerberos/) 认证服务。在 Ubuntu 下使用 `apt install krb5-user` ；在 CentOS 下，使用 `yum install krb5-workstation`；即可。
+
+配置完成后，可以使用 [kcat](https://github.com/edenhill/kcat) 工具进行 Kafka 主题消费验证：
+
+```bash
+kcat <topic> \
+  -b <kafka-server:port> \
+  -G kcat \
+  -X security.protocol=SASL_PLAINTEXT \
+  -X sasl.mechanism=GSSAPI \
+  -X sasl.kerberos.keytab=</path/to/kafkaclient.keytab> \
+  -X sasl.kerberos.principal=<kafkaclient> \
+  -X sasl.kerberos.service.name=kafka
+```
+
+如果出现错误：“Server xxxx not found in kerberos database”，则需要配置 Kafka 节点对应的域名并在 Kerberos 客户端配置文件 `/etc/krb5.conf` 中配置反向域名解析 `rdns = true`。
+
 ### 5. 配置 SSL 证书
 
 如果服务端开启了 SSL 加密认证,此处需要启用 SSL 并配置相关内容。
@@ -60,7 +102,7 @@ TDengine 可以高效地从 Kafka 读取数据并将其写入 TDengine，以实
 
 在 **主题** 中填写要消费的 Topic 名称。可以配置多个 Topic ， Topic 之间用逗号分隔。例如：`tp1,tp2`。
 
-在 **Client ID** 中填写客户端标识，填写后会生成带有 `taosx` 前缀的客户端 ID （例如，如果填写的标识为 `foo`，则生成的客户端 ID 为 `taosxfoo`）。如果打开末尾处的开关，则会把当前任务的任务 ID 拼接到 `taosx` 之后，输入的标识之前（生成的客户端 ID 形如 `taosx100foo`）。连接到同一个 Kafka 集群的所有客户端 ID 必须保证唯一。
+在 **Client ID** 中填写客户端标识，填写后会生成带有 `taosx` 前缀的客户端 ID （例如，如果填写的标识为 `foo`，则生成的客户端 ID 为 `taosxfoo`）。如果打开末尾处的开关，则会把当前任务的任务 ID 拼接到 `taosx` 之后，输入的标识之前（生成的客户端 ID 形如 `taosx100foo`）。需要注意的是，当使用多个 taosX 订阅同一 Topic 需要进行负载均衡时，必须填写一致的客户端 ID 才能达到均衡效果。
 
 在 **消费者组 ID** 中填写消费者组标识，填写后会生成带有 `taosx` 前缀的消费者组 ID （例如，如果填写的标识为 `foo`，则生成的消费者组 ID 为 `taosxfoo`）。如果打开末尾处的开关，则会把当前任务的任务 ID 拼接到 `taosx` 之后，输入的标识之前（生成的消费者组 ID 形如 `taosx100foo`）。
 
@@ -160,4 +202,4 @@ json 数据支持 JSONObject 或者 JSONArray，使用 json 解析器可以解
 
 ### 9. 创建完成
 
-点击 **提交** 按钮，完成创建 Kafka 到 TDengine 的数据同步任务，回到**数据源列表**页面可查看任务执行情况。
+点击 **提交** 按钮，完成创建 Kafka 到 TDengine 的数据同步任务，回到**数据源列表**页面可查看任务执行情况。

docs/zh/07-develop/01-connect/index.md

@@ -387,7 +387,19 @@ DSN 的详细说明和如何使用详见 [连接功能](../../reference/connecto
     - `reconnectIntervalMs`：重连间隔毫秒时间，默认为 2000。
     </TabItem>
     <TabItem label="C" value="c">
-C/C++ 语言连接器使用 `taos_connect()` 函数用于建立与 TDengine 数据库的连接。其参数详细说明如下：
+**Websocket 连接**  
+C/C++ 语言连接器 Websocket 连接方式使用 `ws_connect()` 函数用于建立与 TDengine 数据库的连接。其参数为 DSN 描述字符串，其基本结构如下：
+
+```text
+<driver>[+<protocol>]://[[<username>:<password>@]<host>:<port>][/<database>][?<p1>=<v1>[&<p2>=<v2>]]
+|------|------------|---|-----------|-----------|------|------|------------|-----------------------|
+|driver|   protocol |   | username  | password  | host | port |  database  |  params               |
+```
+
+DSN 的详细说明和如何使用详见 [连接功能](../../reference/connector/cpp/#dsn)
+
+**原生连接**  
+C/C++ 语言连接器原生连接方式使用 `taos_connect()` 函数用于建立与 TDengine 数据库的连接。其参数详细说明如下：
 
 - `host`：要连接的数据库服务器的主机名或IP地址。如果是本地数据库，可以使用 `"localhost"`。
 - `user`：用于登录数据库的用户名。
@@ -440,7 +452,10 @@ C/C++ 语言连接器使用 `taos_connect()` 函数用于建立与 TDengine 数
 ```
     </TabItem>
 <TabItem label="C" value="c">
-不支持
+```c
+{{#include docs/examples/c-ws/connect_example.c}}
+```
+
 </TabItem>    
 <TabItem label="REST API" value="rest">
 不支持

docs/zh/07-develop/02-sql.md

@@ -68,9 +68,15 @@ REST API：直接调用 `taosadapter` 提供的 REST API 接口，进行数据
 ```
 </TabItem>
 <TabItem label="C" value="c">
-```c
+
+```c  title="Websocket 连接"
+{{#include docs/examples/c-ws/create_db_demo.c:create_db_and_table}}
+```
+
+```c  title="原生连接"
 {{#include docs/examples/c/create_db_demo.c:create_db_and_table}}
 ```
+
 </TabItem>
 <TabItem label="REST API" value="rest">
 
@@ -144,7 +150,12 @@ NOW 为系统内部函数，默认为客户端所在计算机当前时间。 NOW
 ```
 </TabItem>
 <TabItem label="C" value="c">
-```c
+
+```c title="Websocket 连接"
+{{#include docs/examples/c-ws/insert_data_demo.c:insert_data}}
+```
+
+```c title="原生连接"
 {{#include docs/examples/c/insert_data_demo.c:insert_data}}
 ```
 
@@ -218,7 +229,12 @@ rust 连接器还支持使用 **serde** 进行反序列化行为结构体的结
 ```
 </TabItem>
 <TabItem label="C" value="c">
-```c
+
+```c  title="Websocket 连接"
+{{#include docs/examples/c-ws/query_data_demo.c:query_data}}
+```
+
+```c  title="原生连接"
 {{#include docs/examples/c/query_data_demo.c:query_data}}
 ```
 </TabItem>
@@ -293,9 +309,15 @@ reqId 可用于请求链路追踪，reqId 就像分布式系统中的 traceId
 ```
 </TabItem>
 <TabItem label="C" value="c">
-```c
+
+```c "Websocket 连接"
+{{#include docs/examples/c-ws/with_reqid_demo.c:with_reqid}}
+```
+
+```c "原生连接"
 {{#include docs/examples/c/with_reqid_demo.c:with_reqid}}
 ```
+
 </TabItem>
 <TabItem label="REST API" value="rest">