diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TD4144Test.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TD4144Test.java new file mode 100644 index 0000000000000000000000000000000000000000..6f29f64111c51600303ad73d517faaa7c59cfe7c --- /dev/null +++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TD4144Test.java @@ -0,0 +1,105 @@ +package com.taosdata.jdbc.cases; + +import com.taosdata.jdbc.TSDBConnection; +import com.taosdata.jdbc.TSDBDriver; +import com.taosdata.jdbc.TSDBResultSet; +import com.taosdata.jdbc.TSDBSubscribe; +import org.junit.AfterClass; +import org.junit.BeforeClass; +import org.junit.Test; + +import java.sql.DriverManager; +import java.sql.ResultSetMetaData; +import java.sql.SQLException; +import java.sql.Statement; +import java.util.Properties; +import java.util.concurrent.TimeUnit; + +public class TD4144Test { + + private static TSDBConnection connection; + private static final String host = "127.0.0.1"; + + private static final String topic = "topic-meter-current-bg-10"; + private static final String sql = "select * from meters where current > 10"; + private static final String sql2 = "select * from meters where ts >= '2020-08-15 12:20:00.000'"; + + + @Test + public void test() throws SQLException { + TSDBSubscribe subscribe = null; + TSDBResultSet res = null; + boolean hasNext = false; + + try { + subscribe = connection.subscribe(topic, sql, false); + int count = 0; + while (true) { + // 等待1秒,避免频繁调用 consume,给服务端造成压力 + TimeUnit.SECONDS.sleep(1); + if (res == null) { + // 消费数据 + res = subscribe.consume(); + hasNext = res.next(); + } + + if (res == null) { + continue; + } + ResultSetMetaData metaData = res.getMetaData(); + int number = 0; + while (hasNext) { + int columnCount = metaData.getColumnCount(); + for (int i = 1; i <= columnCount; i++) { + System.out.print(metaData.getColumnLabel(i) + ": " + res.getString(i) + "\t"); + } + System.out.println(); + count++; + number++; + hasNext = res.next(); + if (!hasNext) { + res.close(); + res = null; + System.out.println("rows: " + count); + } + if (hasNext == true && number >= 10) { + System.out.println("batch" + number); + break; + } + } + + } + + } catch (SQLException | InterruptedException throwables) { + throwables.printStackTrace(); + } finally { + if (subscribe != null) + subscribe.close(true); + } + } + + @BeforeClass + public static void beforeClass() throws SQLException { + Properties properties = new Properties(); + properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8"); + properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8"); + String url = "jdbc:TAOS://" + host + ":6030/?user=root&password=taosdata"; + connection = (DriverManager.getConnection(url, properties)).unwrap(TSDBConnection.class); + try (Statement stmt = connection.createStatement()) { + stmt.execute("drop database if exists power"); + stmt.execute("create database if not exists power"); + stmt.execute("use power"); + stmt.execute("create table meters(ts timestamp, current float, voltage int, phase int) tags(location binary(64), groupId int)"); + stmt.execute("create table d1001 using meters tags(\"Beijing.Chaoyang\", 2)"); + stmt.execute("create table d1002 using meters tags(\"Beijing.Haidian\", 2)"); + stmt.execute("insert into d1001 values(\"2020-08-15 12:00:00.000\", 12, 220, 1),(\"2020-08-15 12:10:00.000\", 12.3, 220, 2),(\"2020-08-15 12:20:00.000\", 12.2, 220, 1)"); + stmt.execute("insert into d1002 values(\"2020-08-15 12:00:00.000\", 9.9, 220, 1),(\"2020-08-15 12:10:00.000\", 10.3, 220, 1),(\"2020-08-15 12:20:00.000\", 11.2, 220, 1)"); + } + } + + @AfterClass + public static void afterClass() throws SQLException { + if (connection != null) + connection.close(); + } +}