TDEngine(taos) 涛思数据库-java写入数据

一、java写入taos简单案例：

pom.xml 中加入以下依赖。

XML 复制代码

<dependency>
  <groupId>com.taosdata.jdbc</groupId>
  <artifactId>taos-jdbcdriver</artifactId>
  <version>3.3.0</version>
</dependency>

java代码

java 复制代码

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Arrays;
import java.util.List;


public class RestInsertExample {
    private static Connection getConnection() throws SQLException {
        /**
         * 默认用户名 root
         * 默认端口号 6041
         */
        String jdbcUrl = "jdbc:TAOS-RS://安装taos的ip地址:6041?user=root&password=taosdata";
        return DriverManager.getConnection(jdbcUrl);
    }

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

    /**
     * 对应涛思数据库插入语句:
     * INSERT INTO power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES('2018-10-03 14:38:05.000',10.30000,219,0.31000)
     * power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES('2018-10-03 14:38:15.000',12.60000,218,0.33000)
     * power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES('2018-10-03 14:38:16.800',12.30000,221,0.31000)
     * power.d1002 USING power.meters TAGS(California.SanFrancisco, 3) VALUES('2018-10-03 14:38:16.650',10.30000,218,0.25000)
     * power.d1003 USING power.meters TAGS(California.LosAngeles, 2) VALUES('2018-10-03 14:38:05.500',11.80000,221,0.28000)
     * power.d1003 USING power.meters TAGS(California.LosAngeles, 2) VALUES('2018-10-03 14:38:16.600',13.40000,223,0.29000)
     * power.d1004 USING power.meters TAGS(California.LosAngeles, 3) VALUES('2018-10-03 14:38:05.000',10.80000,223,0.29000)
     * power.d1004 USING power.meters TAGS(California.LosAngeles, 3) VALUES('2018-10-03 14:38:06.500',11.50000,221,0.35000)
     */
    private static String getSQL() {
        // 拼接插入sql
        StringBuilder sb = new StringBuilder("INSERT INTO ");
        for (String line : getRawData()) {
            String[] ps = line.split(",");
            sb.append("power." + ps[0]).append(" USING power.meters TAGS(")
                    .append(ps[5]).append(", ") // tag: location
                    .append(ps[6]) // tag: groupId
                    .append(") VALUES(")
                    .append('\'').append(ps[1]).append('\'').append(",") // ts
                    .append(ps[2]).append(",") // current
                    .append(ps[3]).append(",") // voltage
                    .append(ps[4]).append(") "); // phase
        }
        return sb.toString();
    }

    public static void insertData() throws SQLException {
        try (Connection conn = getConnection()) {
            try (Statement stmt = conn.createStatement()) {
                //写入的数据的时间戳必须大于当前时间减去数据库配置参数 KEEP 的时间。
                // 如果 KEEP 配置为 3650 天，那么无法写入比 3650 天还早的数据
                stmt.execute("CREATE DATABASE power KEEP 3650");
                stmt.execute("CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) " +
                        "TAGS (location BINARY(64), groupId INT)");
                String sql = getSQL();
                int rowCount = stmt.executeUpdate(sql);
                System.out.println("rowCount=" + rowCount); // rowCount=8
            }
        }
    }

    public static void main(String[] args) throws SQLException {
        insertData();
    }
}

执行结果插入成功：