Insert Using SQL

Introduction

Application programs can execute INSERT statement through connectors to insert rows. The TDengine CLI can also be used to manually insert data.

Insert Single Row

The below SQL statement is used to insert one row into table “d1001”.

1. INSERT INTO d1001 VALUES (1538548685000, 10.3, 219, 0.31);

Insert Multiple Rows

Multiple rows can be inserted in a single SQL statement. The example below inserts 2 rows into table “d1001”.

1. INSERT INTO d1001 VALUES (1538548684000, 10.2, 220, 0.23) (1538548696650, 10.3, 218, 0.25);

Insert into Multiple Tables

Data can be inserted into multiple tables in the same SQL statement. The example below inserts 2 rows into table “d1001” and 1 row into table “d1002”.

1. INSERT INTO d1001 VALUES (1538548685000, 10.3, 219, 0.31) (1538548695000, 12.6, 218, 0.33) d1002 VALUES (1538548696800, 12.3, 221, 0.31);

For more details about INSERT please refer to INSERT.

Insert Using SQL - 图1info
  • Inserting in batches can improve performance. The higher the batch size, the better the performance. Please note that a single row can’t exceed 48K bytes and each SQL statement can’t exceed 1MB.
  • Inserting with multiple threads can also improve performance. However, at a certain point, increasing the number of threads no longer offers any benefit and can even decrease performance due to the overhead involved in frequent thread switching. The optimal number of threads for a system depends on the processing capabilities and configuration of the server, the configuration of the database, the data schema, and the batch size for writing data. In general, more powerful clients and servers can support higher numbers of concurrently writing threads. Given a sufficiently powerful server, a higher number of vgroups for a database also increases the number of concurrent writes. Finally, a simpler data schema enables more concurrent writes as well.
Insert Using SQL - 图2warning
  • If the timestamp of a new record already exists in a table, columns with new data for that timestamp replace old data with new data, while columns without new data are not affected.
  • The timestamp to be inserted must be newer than the timestamp of subtracting current time by the parameter KEEP. If KEEP is set to 3650 days, then the data older than 3650 days ago can’t be inserted. The timestamp to be inserted cannot be newer than the timestamp of current time plus parameter DURATION. If DURATION is set to 2, the data newer than 2 days later can’t be inserted.

Sample program

Insert Using SQL

  • Java
  • Python
  • Go
  • Rust
  • Node.js
  • C#
  • C
  • PHP
1. package com.taos.example;

3. import java.sql.Connection;
4. import java.sql.DriverManager;
5. import java.sql.SQLException;
6. import java.sql.Statement;
7. import java.util.Arrays;
8. import java.util.List;

11. public class RestInsertExample {
12. private static Connection getConnection() throws SQLException {
13. String jdbcUrl = "jdbc:TAOS-RS://localhost:6041?user=root&password=taosdata";
14. return DriverManager.getConnection(jdbcUrl);
15. }

17. private static List<String> getRawData() {
18. return Arrays.asList(
19. "d1001,2018-10-03 14:38:05.000,10.30000,219,0.31000,'California.SanFrancisco',2",
20. "d1001,2018-10-03 14:38:15.000,12.60000,218,0.33000,'California.SanFrancisco',2",
21. "d1001,2018-10-03 14:38:16.800,12.30000,221,0.31000,'California.SanFrancisco',2",
22. "d1002,2018-10-03 14:38:16.650,10.30000,218,0.25000,'California.SanFrancisco',3",
23. "d1003,2018-10-03 14:38:05.500,11.80000,221,0.28000,'California.LosAngeles',2",
24. "d1003,2018-10-03 14:38:16.600,13.40000,223,0.29000,'California.LosAngeles',2",
25. "d1004,2018-10-03 14:38:05.000,10.80000,223,0.29000,'California.LosAngeles',3",
26. "d1004,2018-10-03 14:38:06.500,11.50000,221,0.35000,'California.LosAngeles',3"
27. );
28. }

31. /**
32. * The generated SQL is:
33. * INSERT INTO power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES('2018-10-03 14:38:05.000',10.30000,219,0.31000)
34. * power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES('2018-10-03 14:38:15.000',12.60000,218,0.33000)
35. * power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES('2018-10-03 14:38:16.800',12.30000,221,0.31000)
36. * power.d1002 USING power.meters TAGS(California.SanFrancisco, 3) VALUES('2018-10-03 14:38:16.650',10.30000,218,0.25000)
37. * power.d1003 USING power.meters TAGS(California.LosAngeles, 2) VALUES('2018-10-03 14:38:05.500',11.80000,221,0.28000)
38. * power.d1003 USING power.meters TAGS(California.LosAngeles, 2) VALUES('2018-10-03 14:38:16.600',13.40000,223,0.29000)
39. * power.d1004 USING power.meters TAGS(California.LosAngeles, 3) VALUES('2018-10-03 14:38:05.000',10.80000,223,0.29000)
40. * power.d1004 USING power.meters TAGS(California.LosAngeles, 3) VALUES('2018-10-03 14:38:06.500',11.50000,221,0.35000)
41. */
42. private static String getSQL() {
43. StringBuilder sb = new StringBuilder("INSERT INTO ");
44. for (String line : getRawData()) {
45. String[] ps = line.split(",");
46. sb.append("power." + ps[0]).append(" USING power.meters TAGS(")
47. .append(ps[5]).append(", ") // tag: location
48. .append(ps[6]) // tag: groupId
49. .append(") VALUES(")
50. .append('\'').append(ps[1]).append('\'').append(",") // ts
51. .append(ps[2]).append(",") // current
52. .append(ps[3]).append(",") // voltage
53. .append(ps[4]).append(") "); // phase
54. }
55. return sb.toString();
56. }

58. public static void insertData() throws SQLException {
59. try (Connection conn = getConnection()) {
60. try (Statement stmt = conn.createStatement()) {
61. stmt.execute("CREATE DATABASE power KEEP 3650");
62. stmt.execute("CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) " +
63. "TAGS (location BINARY(64), groupId INT)");
64. String sql = getSQL();
65. int rowCount = stmt.executeUpdate(sql);
66. System.out.println("rowCount=" + rowCount); // rowCount=8
67. }
68. }
69. }

71. public static void main(String[] args) throws SQLException {
72. insertData();
73. }
74. }

view source code

1. import taos

3. lines = ["d1001,2018-10-03 14:38:05.000,10.30000,219,0.31000,'California.SanFrancisco',2",
4. "d1004,2018-10-03 14:38:05.000,10.80000,223,0.29000,'California.LosAngeles',3",
5. "d1003,2018-10-03 14:38:05.500,11.80000,221,0.28000,'California.LosAngeles',2",
6. "d1004,2018-10-03 14:38:06.500,11.50000,221,0.35000,'California.LosAngeles',3",
7. "d1002,2018-10-03 14:38:16.650,10.30000,218,0.25000,'California.SanFrancisco',3",
8. "d1001,2018-10-03 14:38:15.000,12.60000,218,0.33000,'California.SanFrancisco',2",
9. "d1001,2018-10-03 14:38:16.800,12.30000,221,0.31000,'California.SanFrancisco',2",
10. "d1003,2018-10-03 14:38:16.600,13.40000,223,0.29000,'California.LosAngeles',2"]

13. def get_connection() -> taos.TaosConnection:
14. """
15. create connection use firstEp in taos.cfg and use default user and password.
16. """
17. return taos.connect()

20. def create_stable(conn: taos.TaosConnection):
21. conn.execute("CREATE DATABASE power")
22. conn.execute("USE power")
23. conn.execute("CREATE STABLE meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) "
24. "TAGS (location BINARY(64), groupId INT)")

27. # The generated SQL is:
28. # INSERT INTO d1001 USING meters TAGS(California.SanFrancisco, 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)
29. #             d1002 USING meters TAGS(California.SanFrancisco, 3) VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)
30. #             d1003 USING meters TAGS(California.LosAngeles, 2) VALUES ('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000) ('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000)
31. #             d1004 USING meters TAGS(California.LosAngeles, 3) VALUES ('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000) ('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)

33. def get_sql():
34. global lines
35. lines = map(lambda line: line.split(','), lines)  # [['d1001', ...]...]
36. lines = sorted(lines, key=lambda ls: ls[0])  # sort by table name
37. sql = "INSERT INTO "
38. tb_name = None
39. for ps in lines:
40. tmp_tb_name = ps[0]
41. if tb_name != tmp_tb_name:
42. tb_name = tmp_tb_name
43. sql += f"{tb_name} USING meters TAGS({ps[5]}, {ps[6]}) VALUES "
44. sql += f"('{ps[1]}', {ps[2]}, {ps[3]}, {ps[4]}) "
45. return sql

48. def insert_data(conn: taos.TaosConnection):
49. sql = get_sql()
50. affected_rows = conn.execute(sql)
51. print("affected_rows", affected_rows)  # 8

54. if __name__ == '__main__':
55. connection = get_connection()
56. try:
57. create_stable(connection)
58. insert_data(connection)
59. finally:
60. connection.close()

view source code

1. package main

3. import (
4. "database/sql"
5. "fmt"
6. "log"

8. _ "github.com/taosdata/driver-go/v3/taosRestful"
9. )

11. func createStable(taos *sql.DB) {
12. _, err := taos.Exec("CREATE DATABASE power")
13. if err != nil {
14. log.Fatalln("failed to create database, err:", err)
15. }
16. _, err = taos.Exec("CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)")
17. if err != nil {
18. log.Fatalln("failed to create stable, err:", err)
19. }
20. }

22. func insertData(taos *sql.DB) {
23. sql := `INSERT INTO power.d1001 USING power.meters TAGS('California.SanFrancisco', 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)
24. power.d1002 USING power.meters TAGS('California.SanFrancisco', 3) VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)
25. power.d1003 USING power.meters TAGS('California.LosAngeles', 2) VALUES ('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000) ('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000)
26. power.d1004 USING power.meters TAGS('California.LosAngeles', 3) VALUES ('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000) ('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)`
27. result, err := taos.Exec(sql)
28. if err != nil {
29. log.Fatalln("failed to insert, err:", err)
30. }
31. rowsAffected, err := result.RowsAffected()
32. if err != nil {
33. log.Fatalln("failed to get affected rows, err:", err)
34. }
35. fmt.Println("RowsAffected", rowsAffected)
36. }

38. func main() {
39. var taosDSN = "root:taosdata@http(localhost:6041)/"
40. taos, err := sql.Open("taosRestful", taosDSN)
41. if err != nil {
42. log.Fatalln("failed to connect TDengine, err:", err)
43. }
44. defer taos.Close()
45. createStable(taos)
46. insertData(taos)
47. }

view source code

1. use taos::*;

3. #[tokio::main]
4. async fn main() -> anyhow::Result<()> {
5. let dsn = "ws://";
6. let taos = TaosBuilder::from_dsn(dsn)?.build()?;

8. taos.exec_many([
9. "DROP DATABASE IF EXISTS power",
10. "CREATE DATABASE power",
11. "USE power",
12. "CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)"
13. ]).await?;

15. let inserted = taos.exec("INSERT INTO
16. power.d1001 USING power.meters TAGS('California.SanFrancisco', 2)
17. VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000)
18. ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)
19. power.d1002 USING power.meters TAGS('California.SanFrancisco', 3)
20. VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)
21. power.d1003 USING power.meters TAGS('California.LosAngeles', 2)
22. VALUES ('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000) ('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000)
23. power.d1004 USING power.meters TAGS('California.LosAngeles', 3)
24. VALUES ('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000) ('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)").await?;

26. assert_eq!(inserted, 8);
27. Ok(())
28. }

view source code

1. const taos = require("@tdengine/client");

3. const conn = taos.connect({
4. host: "localhost",
5. });

7. const cursor = conn.cursor();
8. try {
9. cursor.execute("CREATE DATABASE power");
10. cursor.execute("USE power");
11. cursor.execute(
12. "CREATE STABLE meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)"
13. );
14. var sql = `INSERT INTO power.d1001 USING power.meters TAGS('California.SanFrancisco', 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)
15. power.d1002 USING power.meters TAGS('California.SanFrancisco', 3) VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)
16. power.d1003 USING power.meters TAGS('California.LosAngeles', 2) VALUES ('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000) ('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000)
17. power.d1004 USING power.meters TAGS('California.LosAngeles', 3) VALUES ('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000) ('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)`;
18. cursor.execute(sql,{'quiet':false});
19. } finally {
20. cursor.close();
21. conn.close();
22. }

24. // run with: node insert_example.js
25. // output:
26. // Successfully connected to TDengine
27. // Query OK, 0 row(s) affected (0.00509570s)
28. // Query OK, 0 row(s) affected (0.00130880s)
29. // Query OK, 0 row(s) affected (0.00467900s)
30. // Query OK, 8 row(s) affected (0.04043550s)
31. // Connection is closed

view source code

1. using TDengineDriver;

4. namespace TDengineExample
5. {
6. internal class SQLInsertExample
7. {

9. static void Main()
10. {
11. IntPtr conn = GetConnection();
12. try
13. {
14. IntPtr res = TDengine.Query(conn, "CREATE DATABASE power");
15. CheckRes(conn, res, "failed to create database");
16. res = TDengine.Query(conn, "USE power");
17. CheckRes(conn, res, "failed to change database");
18. res = TDengine.Query(conn, "CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)");
19. CheckRes(conn, res, "failed to create stable");
20. var sql = "INSERT INTO d1001 USING meters TAGS('California.SanFrancisco', 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000) " +
21. "d1002 USING power.meters TAGS('California.SanFrancisco', 3) VALUES('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000) " +
22. "d1003 USING power.meters TAGS('California.LosAngeles', 2) VALUES('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000)('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000) " +
23. "d1004 USING power.meters TAGS('California.LosAngeles', 3) VALUES('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000)('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)";
24. res = TDengine.Query(conn, sql);
25. CheckRes(conn, res, "failed to insert data");
26. int affectedRows = TDengine.AffectRows(res);
27. Console.WriteLine("affectedRows " + affectedRows);
28. TDengine.FreeResult(res);
29. }
30. finally
31. {
32. TDengine.Close(conn);
33. }

35. }

37. static IntPtr GetConnection()
38. {
39. string host = "localhost";
40. short port = 6030;
41. string username = "root";
42. string password = "taosdata";
43. string dbname = "";
44. var conn = TDengine.Connect(host, username, password, dbname, port);
45. if (conn == IntPtr.Zero)
46. {
47. throw new Exception("Connect to TDengine failed");
48. }
49. else
50. {
51. Console.WriteLine("Connect to TDengine success");
52. }
53. return conn;
54. }

56. static void CheckRes(IntPtr conn, IntPtr res, String errorMsg)
57. {
58. if (TDengine.ErrorNo(res) != 0)
59. {
60. throw new Exception($"{errorMsg} since: {TDengine.Error(res)}");
61. }
62. }

64. }
65. }

67. // output:
68. // Connect to TDengine success
69. // affectedRows 8

view source code

1. // compile with
2. // gcc -o insert_example insert_example.c -ltaos
3. #include <stdio.h>
4. #include <stdlib.h>
5. #include "taos.h"

8. /**
9. * @brief execute sql and print affected rows.
10. *
11. * @param taos
12. * @param sql
13. */
14. void executeSQL(TAOS *taos, const char *sql) {
15. TAOS_RES *res = taos_query(taos, sql);
16. int       code = taos_errno(res);
17. if (code != 0) {
18. printf("Error code: %d; Message: %s\n", code, taos_errstr(res));
19. taos_free_result(res);
20. taos_close(taos);
21. exit(EXIT_FAILURE);
22. }
23. int affectedRows = taos_affected_rows(res);
24. printf("affected rows %d\n", affectedRows);
25. taos_free_result(res);
26. }

30. int main() {
31. TAOS *taos = taos_connect("localhost", "root", "taosdata", NULL, 6030);
32. if (taos == NULL) {
33. printf("failed to connect to server\n");
34. exit(EXIT_FAILURE);
35. }
36. executeSQL(taos, "CREATE DATABASE power");
37. executeSQL(taos, "USE power");
38. executeSQL(taos, "CREATE STABLE meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)");
39. executeSQL(taos, "INSERT INTO d1001 USING meters TAGS('California.SanFrancisco', 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)"
40. "d1002 USING meters TAGS('California.SanFrancisco', 3) VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)"
41. "d1003 USING meters TAGS('California.LosAngeles', 2) VALUES ('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000) ('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000)"
42. "d1004 USING meters TAGS('California.LosAngeles', 3) VALUES ('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000) ('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)");
43. taos_close(taos);
44. taos_cleanup();
45. }

47. // output:
48. // affected rows 0
49. // affected rows 0
50. // affected rows 0
51. // affected rows 8

view source code

1. <?php

3. use TDengine\Connection;
4. use TDengine\Exception\TDengineException;

6. try {
7. // instantiate
8. $host = 'localhost';
9. $port = 6030;
10. $username = 'root';
11. $password = 'taosdata';
12. $dbname = 'power';
13. $connection = new Connection($host, $port, $username, $password, $dbname);

15. // connect
16. $connection->connect();

18. // insert
19. $connection->query('CREATE DATABASE if not exists power');
20. $connection->query('CREATE STABLE if not exists meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)');
21. $resource = $connection->query(<<<'SQL'
22. INSERT INTO power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)
23. power.d1002 USING power.meters TAGS(California.SanFrancisco, 3) VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)
24. power.d1003 USING power.meters TAGS(California.LosAngeles, 2) VALUES ('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000) ('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000)
25. power.d1004 USING power.meters TAGS(California.LosAngeles, 3) VALUES ('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000) ('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)
26. SQL);

28. // get affected rows
29. var_dump($resource->affectedRows());
30. } catch (TDengineException $e) {
31. // throw exception
32. throw $e;
33. }

view source code

Insert Using SQL - 图3note
  1. With either native connection or REST connection, the above samples can work well.
  2. Please note that use db can’t be used with a REST connection because REST connections are stateless, so in the samples dbName.tbName is used to specify the table name.

Insert with Parameter Binding

TDengine also provides API support for parameter binding. Similar to MySQL, only ? can be used in these APIs to represent the parameters to bind. This avoids the resource consumption of SQL syntax parsing when writing data through the parameter binding interface, thus significantly improving write performance in most cases.

Parameter binding is available only with native connection.

  • Java
  • Python
  • Go
  • Rust
  • Node.js
  • C#
  • C
  • PHP
1. package com.taos.example;

3. import com.taosdata.jdbc.TSDBPreparedStatement;

5. import java.sql.Connection;
6. import java.sql.DriverManager;
7. import java.sql.SQLException;
8. import java.sql.Statement;
9. import java.time.LocalDateTime;
10. import java.time.ZoneOffset;
11. import java.time.format.DateTimeFormatter;
12. import java.util.ArrayList;
13. import java.util.Arrays;
14. import java.util.List;

16. public class StmtInsertExample {
17. private static ArrayList<Long> tsToLongArray(String ts) {
18. ArrayList<Long> result = new ArrayList<>();
19. DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
20. LocalDateTime localDateTime = LocalDateTime.parse(ts, formatter);
21. result.add(localDateTime.toInstant(ZoneOffset.of("+8")).toEpochMilli());
22. return result;
23. }

25. private static <T> ArrayList<T> toArray(T v) {
26. ArrayList<T> result = new ArrayList<>();
27. result.add(v);
28. return result;
29. }

31. private static List<String> getRawData() {
32. return Arrays.asList(
33. "d1001,2018-10-03 14:38:05.000,10.30000,219,0.31000,California.SanFrancisco,2",
34. "d1001,2018-10-03 14:38:15.000,12.60000,218,0.33000,California.SanFrancisco,2",
35. "d1001,2018-10-03 14:38:16.800,12.30000,221,0.31000,California.SanFrancisco,2",
36. "d1002,2018-10-03 14:38:16.650,10.30000,218,0.25000,California.SanFrancisco,3",
37. "d1003,2018-10-03 14:38:05.500,11.80000,221,0.28000,California.LosAngeles,2",
38. "d1003,2018-10-03 14:38:16.600,13.40000,223,0.29000,California.LosAngeles,2",
39. "d1004,2018-10-03 14:38:05.000,10.80000,223,0.29000,California.LosAngeles,3",
40. "d1004,2018-10-03 14:38:06.500,11.50000,221,0.35000,California.LosAngeles,3"
41. );
42. }

44. private static Connection getConnection() throws SQLException {
45. String jdbcUrl = "jdbc:TAOS://localhost:6030?user=root&password=taosdata";
46. return DriverManager.getConnection(jdbcUrl);
47. }

49. private static void createTable(Connection conn) throws SQLException {
50. try (Statement stmt = conn.createStatement()) {
51. stmt.execute("CREATE DATABASE power KEEP 3650");
52. stmt.executeUpdate("USE power");
53. stmt.execute("CREATE STABLE meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) " +
54. "TAGS (location BINARY(64), groupId INT)");
55. }
56. }

58. private static void insertData() throws SQLException {
59. try (Connection conn = getConnection()) {
60. createTable(conn);
61. String psql = "INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)";
62. try (TSDBPreparedStatement pst = (TSDBPreparedStatement) conn.prepareStatement(psql)) {
63. for (String line : getRawData()) {
64. String[] ps = line.split(",");
65. // bind table name and tags
66. pst.setTableName(ps[0]);
67. pst.setTagString(0, ps[5]);
68. pst.setTagInt(1, Integer.valueOf(ps[6]));
69. // bind values
70. pst.setTimestamp(0, tsToLongArray(ps[1])); //ps[1] looks like: 2018-10-03 14:38:05.000
71. pst.setFloat(1, toArray(Float.valueOf(ps[2])));
72. pst.setInt(2, toArray(Integer.valueOf(ps[3])));
73. pst.setFloat(3, toArray(Float.valueOf(ps[4])));
74. pst.columnDataAddBatch();
75. }
76. pst.columnDataExecuteBatch();
77. }
78. }
79. }

81. public static void main(String[] args) throws SQLException {
82. insertData();
83. }
84. }

view source code

Single

1. import taos
2. from datetime import datetime

4. # note: lines have already been sorted by table name
5. lines = [('d1001', '2018-10-03 14:38:05.000', 10.30000, 219, 0.31000, 'California.SanFrancisco', 2),
6. ('d1001', '2018-10-03 14:38:15.000', 12.60000, 218, 0.33000, 'California.SanFrancisco', 2),
7. ('d1001', '2018-10-03 14:38:16.800', 12.30000, 221, 0.31000, 'California.SanFrancisco', 2),
8. ('d1002', '2018-10-03 14:38:16.650', 10.30000, 218, 0.25000, 'California.SanFrancisco', 3),
9. ('d1003', '2018-10-03 14:38:05.500', 11.80000, 221, 0.28000, 'California.LosAngeles', 2),
10. ('d1003', '2018-10-03 14:38:16.600', 13.40000, 223, 0.29000, 'California.LosAngeles', 2),
11. ('d1004', '2018-10-03 14:38:05.000', 10.80000, 223, 0.29000, 'California.LosAngeles', 3),
12. ('d1004', '2018-10-03 14:38:06.500', 11.50000, 221, 0.35000, 'California.LosAngeles', 3)]

15. def get_ts(ts: str):
16. dt = datetime.strptime(ts, '%Y-%m-%d %H:%M:%S.%f')
17. return int(dt.timestamp() * 1000)

20. def create_stable():
21. conn = taos.connect()
22. try:
23. conn.execute("CREATE DATABASE power")
24. conn.execute("CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) "
25. "TAGS (location BINARY(64), groupId INT)")
26. finally:
27. conn.close()

30. def bind_row_by_row(stmt: taos.TaosStmt):
31. tb_name = None
32. for row in lines:
33. if tb_name != row[0]:
34. tb_name = row[0]
35. tags: taos.TaosBind = taos.new_bind_params(2)  # 2 is count of tags
36. tags[0].binary(row[5])  # location
37. tags[1].int(row[6])  # groupId
38. stmt.set_tbname_tags(tb_name, tags)
39. values: taos.TaosBind = taos.new_bind_params(4)  # 4 is count of columns
40. values[0].timestamp(get_ts(row[1]))
41. values[1].float(row[2])
42. values[2].int(row[3])
43. values[3].float(row[4])
44. stmt.bind_param(values)

47. def insert_data():
48. conn = taos.connect(database="power")
49. try:
50. stmt = conn.statement("INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)")
51. bind_row_by_row(stmt)
52. stmt.execute()
53. stmt.close()
54. finally:
55. conn.close()

58. if __name__ == '__main__':
59. create_stable()
60. insert_data()

view source code

Multiple

1. table_tags = {
2. "d1001": ('California.SanFrancisco', 2),
3. "d1002": ('California.SanFrancisco', 3),
4. "d1003": ('California.LosAngeles', 2),
5. "d1004": ('California.LosAngeles', 3)
6. }

8. table_values = {
9. "d1001": [
10. ['2018-10-03 14:38:05.000', '2018-10-03 14:38:15.000', '2018-10-03 14:38:16.800'],
11. [10.3, 12.6, 12.3],
12. [219, 218, 221],
13. [0.31, 0.33, 0.32]
14. ],
15. "d1002": [
16. ['2018-10-03 14:38:16.650'], [10.3], [218], [0.25]
17. ],
18. "d1003": [
19. ['2018-10-03 14:38:05.500', '2018-10-03 14:38:16.600'],
20. [11.8, 13.4],
21. [221, 223],
22. [0.28, 0.29]
23. ],
24. "d1004": [
25. ['2018-10-03 14:38:05.500', '2018-10-03 14:38:06.500'],
26. [10.8, 11.5],
27. [223, 221],
28. [0.29, 0.35]
29. ]
30. }

33. def bind_multi_rows(stmt: taos.TaosStmt):
34. """
35. batch bind example
36. """
37. for tb_name in table_values.keys():
38. tags = table_tags[tb_name]
39. tag_params = taos.new_bind_params(2)
40. tag_params[0].binary(tags[0])
41. tag_params[1].int(tags[1])
42. stmt.set_tbname_tags(tb_name, tag_params)

44. values = table_values[tb_name]
45. value_params = taos.new_multi_binds(4)
46. value_params[0].timestamp([get_ts(t) for t in values[0]])
47. value_params[1].float(values[1])
48. value_params[2].int(values[2])
49. value_params[3].float(values[3])
50. stmt.bind_param_batch(value_params)

53. def insert_data():
54. conn = taos.connect(database="power")
55. try:
56. stmt = conn.statement("INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)")
57. bind_multi_rows(stmt)
58. stmt.execute()
59. stmt.close()
60. finally:
61. conn.close()

view source code

Insert Using SQL - 图4info

Multiple row binding is better in performance than single row binding, but it can only be used with INSERT statement while single row binding can be used for other SQL statements besides INSERT.

1. package main

3. import (
4. "fmt"
5. "time"

7. "github.com/taosdata/driver-go/v3/af"
8. "github.com/taosdata/driver-go/v3/common"
9. "github.com/taosdata/driver-go/v3/common/param"
10. )

12. func checkErr(err error, prompt string) {
13. if err != nil {
14. fmt.Printf("%s\n", prompt)
15. panic(err)
16. }
17. }

19. func prepareStable(conn *af.Connector) {
20. _, err := conn.Exec("CREATE DATABASE power")
21. checkErr(err, "failed to create database")
22. _, err = conn.Exec("CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)")
23. checkErr(err, "failed to create stable")
24. _, err = conn.Exec("USE power")
25. checkErr(err, "failed to change database")
26. }

28. func main() {
29. conn, err := af.Open("localhost", "root", "taosdata", "", 6030)
30. checkErr(err, "fail to connect")
31. defer conn.Close()
32. prepareStable(conn)
33. // create stmt
34. stmt := conn.InsertStmt()
35. defer stmt.Close()
36. err = stmt.Prepare("INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)")
37. checkErr(err, "failed to create prepare statement")

39. // bind table name and tags
40. tagParams := param.NewParam(2).AddBinary([]byte("California.SanFrancisco")).AddInt(2)
41. err = stmt.SetTableNameWithTags("d1001", tagParams)
42. checkErr(err, "failed to execute SetTableNameWithTags")

44. // specify ColumnType
45. var bindType *param.ColumnType = param.NewColumnType(4).AddTimestamp().AddFloat().AddInt().AddFloat()

47. // bind values. note: can only bind one row each time.
48. valueParams := []*param.Param{
49. param.NewParam(1).AddTimestamp(time.Unix(1648432611, 249300000), common.PrecisionMilliSecond),
50. param.NewParam(1).AddFloat(10.3),
51. param.NewParam(1).AddInt(219),
52. param.NewParam(1).AddFloat(0.31),
53. }
54. err = stmt.BindParam(valueParams, bindType)
55. checkErr(err, "BindParam error")
56. err = stmt.AddBatch()
57. checkErr(err, "AddBatch error")

59. // bind one more row
60. valueParams = []*param.Param{
61. param.NewParam(1).AddTimestamp(time.Unix(1648432611, 749300000), common.PrecisionMilliSecond),
62. param.NewParam(1).AddFloat(12.6),
63. param.NewParam(1).AddInt(218),
64. param.NewParam(1).AddFloat(0.33),
65. }
66. err = stmt.BindParam(valueParams, bindType)
67. checkErr(err, "BindParam error")
68. err = stmt.AddBatch()
69. checkErr(err, "AddBatch error")
70. // execute
71. err = stmt.Execute()
72. checkErr(err, "Execute batch error")
73. }

view source code

Insert Using SQL - 图5tip

github.com/taosdata/driver-go/v3/wrapper module in driver-go is the wrapper for C API, it can be used to insert data with parameter binding.

1. use taos::*;

3. #[tokio::main]
4. async fn main() -> anyhow::Result<()> {
5. let taos = TaosBuilder::from_dsn("taos://")?.build()?;
6. taos.create_database("power").await?;
7. taos.use_database("power").await?;
8. taos.exec("CREATE STABLE IF NOT EXISTS meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)").await?;

10. let mut stmt = Stmt::init(&taos)?;
11. stmt.prepare("INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)")?;
12. // bind table name and tags
13. stmt.set_tbname_tags(
14. "d1001",
15. &[
16. Value::VarChar("California.SanFransico".into()),
17. Value::Int(2),
18. ],
19. )?;
20. // bind values.
21. let values = vec![
22. ColumnView::from_millis_timestamp(vec![1648432611249]),
23. ColumnView::from_floats(vec![10.3]),
24. ColumnView::from_ints(vec![219]),
25. ColumnView::from_floats(vec![0.31]),
26. ];
27. stmt.bind(&values)?;
28. // bind one more row
29. let values2 = vec![
30. ColumnView::from_millis_timestamp(vec![1648432611749]),
31. ColumnView::from_floats(vec![12.6]),
32. ColumnView::from_ints(vec![218]),
33. ColumnView::from_floats(vec![0.33]),
34. ];
35. stmt.bind(&values2)?;

37. stmt.add_batch()?;

39. // execute.
40. let rows = stmt.execute()?;
41. assert_eq!(rows, 2);
42. Ok(())
43. }

view source code

Single

1. const taos = require("@tdengine/client");

3. const conn = taos.connect({
4. host: "localhost",
5. });

7. const cursor = conn.cursor();

9. function prepareSTable() {
10. cursor.execute("CREATE DATABASE power");
11. cursor.execute("USE power");
12. cursor.execute(
13. "CREATE STABLE meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)"
14. );
15. }

17. function insertData() {
18. // init
19. cursor.stmtInit();
20. // prepare
21. cursor.stmtPrepare(
22. "INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)"
23. );

25. // bind table name and tags
26. let tagBind = new taos.TaosMultiBindArr(2);
27. tagBind.multiBindBinary(["California.SanFrancisco"]);
28. tagBind.multiBindInt([2]);
29. cursor.stmtSetTbnameTags("d1001", tagBind.getMultiBindArr());

31. // bind values
32. let rows = [[1648432611249, 1648432611749], [10.3, 12.6], [219, 218], [0.31, 0.33]];

34. let valueBind = new taos.TaosMultiBindArr(4);
35. valueBind.multiBindTimestamp(rows[0]);
36. valueBind.multiBindFloat(rows[1]);
37. valueBind.multiBindInt(rows[2]);
38. valueBind.multiBindFloat(rows[3]);
39. cursor.stmtBindParamBatch(valueBind.getMultiBindArr());
40. cursor.stmtAddBatch();

43. // execute
44. cursor.stmtExecute();
45. cursor.stmtClose();
46. }

48. try {
49. prepareSTable();
50. insertData();
51. } finally {
52. cursor.close();
53. conn.close();
54. }

view source code

Multiple

1. function insertData() {
2. // init
3. cursor.stmtInit();
4. // prepare
5. cursor.stmtPrepare(
6. "INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)"
7. );

9. // bind table name and tags
10. let tagBind = new taos.TaosMultiBindArr(2);
11. tagBind.multiBindBinary(["California.SanFrancisco"]);
12. tagBind.multiBindInt([2]);
13. cursor.stmtSetTbnameTags("d1001", tagBind.getMultiBindArr());

15. // bind values
16. let valueBind = new taos.TaosMultiBindArr(4);
17. valueBind.multiBindTimestamp([1648432611249, 1648432611749]);
18. valueBind.multiBindFloat([10.3, 12.6]);
19. valueBind.multiBindInt([219, 218]);
20. valueBind.multiBindFloat([0.31, 0.33]);
21. cursor.stmtBindParamBatch(valueBind.getMultiBindArr());
22. cursor.stmtAddBatch();

24. // execute
25. cursor.stmtExecute();
26. cursor.stmtClose();
27. }

view source code

Insert Using SQL - 图6info

Multiple row binding is better in performance than single row binding, but it can only be used with INSERT statement while single row binding can be used for other SQL statements besides INSERT.

1. using TDengineDriver;

3. namespace TDengineExample
4. {
5. internal class StmtInsertExample
6. {
7. private static IntPtr conn;
8. private static IntPtr stmt;
9. static void Main()
10. {
11. conn = GetConnection();
12. try
13. {
14. PrepareSTable();
15. // 1. init and prepare
16. stmt = TDengine.StmtInit(conn);
17. if (stmt == IntPtr.Zero)
18. {
19. throw new Exception("failed to init stmt.");
20. }
21. int res = TDengine.StmtPrepare(stmt, "INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)");
22. CheckStmtRes(res, "failed to prepare stmt");

24. // 2. bind table name and tags
25. TAOS_MULTI_BIND[] tags = new TAOS_MULTI_BIND[2] { TaosMultiBind.MultiBindBinary(new string[] { "California.SanFrancisco" }), TaosMultiBind.MultiBindInt(new int?[] { 2 }) };
26. res = TDengine.StmtSetTbnameTags(stmt, "d1001", tags);
27. CheckStmtRes(res, "failed to bind table name and tags");

29. // 3. bind values
30. TAOS_MULTI_BIND[] values = new TAOS_MULTI_BIND[4] {
31. TaosMultiBind.MultiBindTimestamp(new long[2] { 1648432611249, 1648432611749}),
32. TaosMultiBind.MultiBindFloat(new float?[2] { 10.3f, 12.6f}),
33. TaosMultiBind.MultiBindInt(new int?[2] { 219, 218}),
34. TaosMultiBind.MultiBindFloat(new float?[2]{ 0.31f, 0.33f})
35. };
36. res = TDengine.StmtBindParamBatch(stmt, values);
37. CheckStmtRes(res, "failed to bind params");

39. // 4. add batch
40. res = TDengine.StmtAddBatch(stmt);
41. CheckStmtRes(res, "failed to add batch");

43. // 5. execute
44. res = TDengine.StmtExecute(stmt);
45. CheckStmtRes(res, "faild to execute");

47. // 6. free
48. TaosMultiBind.FreeTaosBind(tags);
49. TaosMultiBind.FreeTaosBind(values);
50. }
51. finally
52. {
53. TDengine.Close(conn);
54. }

56. }

58. static IntPtr GetConnection()
59. {
60. string host = "localhost";
61. short port = 6030;
62. string username = "root";
63. string password = "taosdata";
64. string dbname = "";
65. var conn = TDengine.Connect(host, username, password, dbname, port);
66. if (conn == IntPtr.Zero)
67. {
68. throw new Exception("Connect to TDengine failed");
69. }
70. else
71. {
72. Console.WriteLine("Connect to TDengine success");
73. }
74. return conn;
75. }

77. static void PrepareSTable()
78. {
79. IntPtr res = TDengine.Query(conn, "CREATE DATABASE power");
80. CheckResPtr(res, "failed to create database");
81. res = TDengine.Query(conn, "USE power");
82. CheckResPtr(res, "failed to change database");
83. res = TDengine.Query(conn, "CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)");
84. CheckResPtr(res, "failed to create stable");
85. }

87. static void CheckStmtRes(int res, string errorMsg)
88. {
89. if (res != 0)
90. {
91. Console.WriteLine(errorMsg + ", " + TDengine.StmtErrorStr(stmt));
92. int code = TDengine.StmtClose(stmt);
93. if (code != 0)
94. {
95. throw new Exception($"falied to close stmt, {code} reason: {TDengine.StmtErrorStr(stmt)} ");
96. }
97. }
98. }

100. static void CheckResPtr(IntPtr res, string errorMsg)
101. {
102. if (TDengine.ErrorNo(res) != 0)
103. {
104. throw new Exception(errorMsg + " since:" + TDengine.Error(res));
105. }
106. }

108. }
109. }

view source code

Single

1. // compile with
2. // gcc -o stmt_example stmt_example.c -ltaos
3. #include <stdio.h>
4. #include <stdlib.h>
5. #include <string.h>
6. #include "taos.h"

8. /**
9. * @brief execute sql only.
10. *
11. * @param taos
12. * @param sql
13. */
14. void executeSQL(TAOS *taos, const char *sql) {
15. TAOS_RES *res = taos_query(taos, sql);
16. int       code = taos_errno(res);
17. if (code != 0) {
18. printf("%s\n", taos_errstr(res));
19. taos_free_result(res);
20. taos_close(taos);
21. exit(EXIT_FAILURE);
22. }
23. taos_free_result(res);
24. }

26. /**
27. * @brief check return status and exit program when error occur.
28. *
29. * @param stmt
30. * @param code
31. * @param msg
32. */
33. void checkErrorCode(TAOS_STMT *stmt, int code, const char* msg) {
34. if (code != 0) {
35. printf("%s. error: %s\n", msg, taos_stmt_errstr(stmt));
36. taos_stmt_close(stmt);
37. exit(EXIT_FAILURE);
38. }
39. }

41. typedef struct {
42. int64_t ts;
43. float current;
44. int voltage;
45. float phase;
46. } Row;

48. /**
49. * @brief insert data using stmt API
50. *
51. * @param taos
52. */
53. void insertData(TAOS *taos) {
54. // init
55. TAOS_STMT *stmt = taos_stmt_init(taos);
56. // prepare
57. const char *sql = "INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)";
58. int code = taos_stmt_prepare(stmt, sql, 0);
59. checkErrorCode(stmt, code, "failed to execute taos_stmt_prepare");
60. // bind table name and tags
61. TAOS_BIND tags[2];
62. char* location = "California.SanFrancisco";
63. int groupId = 2;
64. tags[0].buffer_type = TSDB_DATA_TYPE_BINARY;
65. tags[0].buffer_length = strlen(location);
66. tags[0].length = &tags[0].buffer_length;
67. tags[0].buffer = location;
68. tags[0].is_null = NULL;

70. tags[1].buffer_type = TSDB_DATA_TYPE_INT;
71. tags[1].buffer_length = sizeof(int);
72. tags[1].length = &tags[1].buffer_length;
73. tags[1].buffer = &groupId;
74. tags[1].is_null = NULL;

76. code = taos_stmt_set_tbname_tags(stmt, "d1001", tags);
77. checkErrorCode(stmt, code, "failed to execute taos_stmt_set_tbname_tags");

79. // insert two rows
80. Row rows[2] = {
81. {1648432611249, 10.3, 219, 0.31},
82. {1648432611749, 12.6, 218, 0.33},
83. };

85. TAOS_BIND values[4];
86. values[0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
87. values[0].buffer_length = sizeof(int64_t);
88. values[0].length = &values[0].buffer_length;
89. values[0].is_null = NULL;

91. values[1].buffer_type = TSDB_DATA_TYPE_FLOAT;
92. values[1].buffer_length = sizeof(float);
93. values[1].length = &values[1].buffer_length;
94. values[1].is_null = NULL;

96. values[2].buffer_type = TSDB_DATA_TYPE_INT;
97. values[2].buffer_length = sizeof(int);
98. values[2].length = &values[2].buffer_length;
99. values[2].is_null = NULL;

101. values[3].buffer_type = TSDB_DATA_TYPE_FLOAT;
102. values[3].buffer_length = sizeof(float);
103. values[3].length = &values[3].buffer_length;
104. values[3].is_null = NULL;

106. for (int i = 0; i < 2; ++i) {
107. values[0].buffer = &rows[i].ts;
108. values[1].buffer = &rows[i].current;
109. values[2].buffer = &rows[i].voltage;
110. values[3].buffer = &rows[i].phase;
111. code = taos_stmt_bind_param(stmt, values); // bind param
112. checkErrorCode(stmt, code, "failed to execute taos_stmt_bind_param");
113. code = taos_stmt_add_batch(stmt); // add batch
114. checkErrorCode(stmt, code, "failed to execute taos_stmt_add_batch");
115. }
116. // execute
117. code = taos_stmt_execute(stmt);
118. checkErrorCode(stmt, code, "failed to execute taos_stmt_execute");
119. int affectedRows = taos_stmt_affected_rows(stmt);
120. printf("successfully inserted %d rows\n", affectedRows);
121. // close
122. taos_stmt_close(stmt);
123. }

125. int main() {
126. TAOS *taos = taos_connect("localhost", "root", "taosdata", NULL, 6030);
127. if (taos == NULL) {
128. printf("failed to connect to server\n");
129. exit(EXIT_FAILURE);
130. }
131. executeSQL(taos, "CREATE DATABASE power");
132. executeSQL(taos, "USE power");
133. executeSQL(taos, "CREATE STABLE meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)");
134. insertData(taos);
135. taos_close(taos);
136. taos_cleanup();
137. }

140. // output:
141. // successfully inserted 2 rows

view source code

Multiple

``` 1. // compile with 2. // gcc -o multi_bind_example multi_bind_example.c -ltaos 3. #include <stdio.h> 4. #include <stdlib.h> 5. #include <string.h> 6. #include "taos.h"

  1. /**
    • @brief execute sql only and ignore result set
  3. *
    • @param taos
    • @param sql
  6. */
  7. void executeSQL(TAOS taos, const char sql) {
  8. TAOS_RES *res = taos_query(taos, sql);
  9. int code = taos_errno(res);
  10. if (code != 0) {
  11. printf("%s\n", taos_errstr(res));
  12. taos_free_result(res);
  13. taos_close(taos);
  14. exit(EXIT_FAILURE);
  15. }
  16. taos_free_result(res);

  17. }

  18. /**

    • @brief exit program when error occur.
  20. *
    • @param stmt
    • @param code
    • @param msg
  24. */
  25. void checkErrorCode(TAOS_STMT stmt, int code, const char msg) {
  26. if (code != 0) {
  27. printf("%s. error: %s\n", msg, taos_stmt_errstr(stmt));
  28. taos_stmt_close(stmt);
  29. exit(EXIT_FAILURE);
  30. }

  31. }

  32. /**

    • @brief insert data using stmt API
  34. *
    • @param taos
  36. */
  37. void insertData(TAOS *taos) {
  38. // init
  39. TAOS_STMT *stmt = taos_stmt_init(taos);
  40. // prepare
  41. const char *sql = "INSERT INTO ? USING meters TAGS(?, ?) values(?, ?, ?, ?)";
  42. int code = taos_stmt_prepare(stmt, sql, 0);
  43. checkErrorCode(stmt, code, "failed to execute taos_stmt_prepare");
  44. // bind table name and tags
  45. TAOS_BIND tags[2];
  46. char *location = "California.SanFrancisco";
  47. int groupId = 2;
  48. tags[0].buffer_type = TSDB_DATA_TYPE_BINARY;
  49. tags[0].buffer_length = strlen(location);
  50. tags[0].length = &tags[0].buffer_length;
  51. tags[0].buffer = location;

  52. tags[0].is_null = NULL;

  53. tags[1].buffer_type = TSDB_DATA_TYPE_INT;

  54. tags[1].buffer_length = sizeof(int);
  55. tags[1].length = &tag

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