Lindorm:Java JDBC Driver developer guide

Background information

The JDBC Driver for LindormTSDB implements interfaces defined in the JDBC 4.1 specification. As a time series database, LindormTSDB supports a subset of the basic feature set defined in JDBC 1.0.

Prerequisites

• Java is installed. Java Development Kit (JDK) 1.8 or later is required.

• The client IP address is added to the Lindorm whitelist. For more information, see Set a whitelist.

• The connection address for LindormTSDB has been obtained. For more information, see View endpoints.

Procedure

1. Install the Lindorm JDBC Driver dependency in one of the following ways.

   • Manual installation.

     To integrate the JDBC Driver locally, download the JAR package from Lindorm-all-client. Select the version that you want to install. For example, to install version 2.1.2, download the lindorm-all-client-2.1.2.jar package.

   • Download using Maven.

     To integrate the JDBC Driver in a Maven project, create a project and add the following dependency to the pom.xml file:

     <dependency>
         <groupId>com.aliyun.lindorm</groupId>  
         <artifactId>lindorm-all-client</artifactId>
         <version>2.2.1.3</version>
     </dependency>

     Note

     Set the version number for lindorm-all-client to the version you require.

2. You can access LindormTSDB. For a complete code sample, see Access example.

   1. Establish a connection to LindormTSDB.

      String url = "jdbc:lindorm:tsdb:url=http://<host:port>";
      Connection conn = DriverManager.getConnection(url);

      Note

      • host:port: The connection address and port of LindormTSDB. For example, ld-bp17j28j2y7pm****-proxy-tsdb.lindorm.rds.aliyuncs.com:8242.

      • jdbc:lindorm:tsdb:url=http://<host:port>: The JDBC connection address.

   2. Create a LindormTSDB database and table.

      Statement stmt = conn.createStatement();
      
      stmt.execute("CREATE DATABASE test");
      stmt.execute("USE test");
      stmt.execute("CREATE TABLE sensor (device_id VARCHAR TAG,region VARCHAR TAG,time TIMESTAMP,temperature DOUBLE,humidity DOUBLE,PRIMARY KEY(device_id))");

   3. Insert data into the sensor table.

      // Bulk write data with PreparedStatement (recommended)
      PreparedStatement pstmt = conn.prepareStatement("INSERT INTO sensor (device_id, region, time, temperature, humidity) VALUES (?, ?, ?, ?, ?)");
      int batchSize = 100;
      long ts = System.currentTimeMillis();
      
      for (int i = 0; i < batchSize; i++) {
      
           // Bind parameters in the order of columns in the INSERT statement
           pstmt.setString(1, "F07A1260");
           pstmt.setString(2, "north-cn");
           pstmt.setLong(3, ts + i * 10000);
           pstmt.setDouble(4, 12.1);
           pstmt.setLong(5, 45);
      
           pstmt.addBatch();
      }
      
      pstmt.executeBatch();
      pstmt.clearBatch();
      
      // Bulk write data 
      Statement stmt = conn.createStatement();
      stmt.addBatch("INSERT INTO sensor(device_id, region, time, temperature, humidity) values('F07A1260','north-cn',1619076780000,12.1,45)");
      stmt.addBatch("INSERT INTO sensor(device_id, region, time, temperature, humidity) values('F07A1260','north-cn',1619076790000,13.2,47)");
      stmt.addBatch("INSERT INTO sensor(device_id, region, time, temperature, humidity) values('F07A1260','north-cn',1619076800000,10.6,46)");
      stmt.addBatch("INSERT INTO sensor(device_id, region, time, temperature, humidity) values('F07A1261','south-cn',1619076780000,18.1,44)");
      stmt.addBatch("INSERT INTO sensor(device_id, region, time, temperature, humidity) values('F07A1261','south-cn',1619076790000,19.7,44)");
      stmt.executeBatch();
      stmt.clearBatch();
      
      // Write a single row (not recommended)
      Statement stmt = conn.createStatement();
      stmt.execute("INSERT INTO sensor(device_id, region, time, temperature, humidity) values('F07A1260','north-cn',1619076780000,12.1,45)");

   4. Query data from the sensor table.

      ResultSet rs = stmt.executeQuery("select device_id, region,time,temperature,humidity from sensor where time >= 1619076780000 and time <= 1619076800000");
      
      while (rs.next()) {
          String device_id = rs.getString("device_id");
          String region = rs.getString("region");
          Long time = rs.getLong("time");
          Double temperature = rs.getDouble("temperature");
          Long humidity = rs.getLong("humidity");
          System.out.printf("%s %s %d %f %d\n", device_id, region, time, temperature, humidity);
      }