test: demo for produce message to TQ and consume message from TQ

examples/JDBC/JDBCDemo/pom.xml

@@ -17,7 +17,7 @@
         <dependency>
             <groupId>com.taosdata.jdbc</groupId>
             <artifactId>taos-jdbcdriver</artifactId>
-            <version>2.0.36</version>
+            <version>2.0.38</version>
         </dependency>
     </dependencies>
 

examples/JDBC/JDBCDemo/src/main/java/com/taosdata/example/TQDemo.java

+package com.taosdata.example;
+
+import com.taosdata.jdbc.TSDBConnection;
+import com.taosdata.jdbc.TSDBResultSet;
+import com.taosdata.jdbc.TSDBSubscribe;
+
+import java.sql.*;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.concurrent.TimeUnit;
+
+public class TQDemo {
+    private static final String host = "192.168.56.105";
+    private static final String topic = "test_tq";
+
+    public static void main(String[] args) {
+        try (Connection conn = getConnection()) {
+            createTopic(conn);
+
+            Thread producer = new Thread(new Producer(conn, topic, 1));
+            producer.start();
+
+            Thread consumer = new Thread(new Consumer(conn, topic, 1), "Consumer");
+            consumer.start();
+
+            producer.join();
+            consumer.join();
+
+        } catch (SQLException | InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static Connection getConnection() throws SQLException {
+        final String jdbcUrl = "jdbc:TAOS://" + host + ":6030/";
+        return DriverManager.getConnection(jdbcUrl, "root", "taosdata");
+    }
+
+    private static void createTopic(Connection conn) throws SQLException {
+        try (Statement stmt = conn.createStatement()) {
+            stmt.execute("drop topic if exists " + topic);
+            stmt.execute("create topic if not exists " + topic + " partitions 1");
+        }
+    }
+
+    private static class Producer implements Runnable {
+        private final Connection conn;
+        private final String topic;
+        private final int partitionIndex;
+
+        private Producer(Connection conn, String topic, int partitionIndex) {
+            this.conn = conn;
+            this.topic = topic;
+            this.partitionIndex = partitionIndex;
+        }
+
+        @Override
+        public void run() {
+            try (Statement stmt = conn.createStatement()) {
+                for (int i = 0; i < 10; i++) {
+                    stmt.execute("insert into " + topic + ".p" + partitionIndex + " (off, ts, content) values(0, now, 'abcdefg')");
+                    TimeUnit.SECONDS.sleep(1);
+                }
+            } catch (SQLException | InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    private static class Consumer implements Runnable {
+        private static final SimpleDateFormat formator = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
+        private final Connection conn;
+        private final String topic;
+        private final int partitionIndex;
+
+        private Consumer(Connection conn, String topic, int partitionIndex) {
+            this.conn = conn;
+            this.topic = topic;
+            this.partitionIndex = partitionIndex;
+        }
+
+        @Override
+        public void run() {
+            try {
+                System.out.println(Thread.currentThread().getName() + " started");
+                TSDBConnection tsdbConn = conn.unwrap(TSDBConnection.class);
+                final String sql = "select * from " + topic + ".p" + partitionIndex;
+                TSDBSubscribe subscribe = tsdbConn.subscribe(topic, sql, false);
+
+
+                for (int count = 0; true; ) {
+                    TSDBResultSet rs = subscribe.consume();
+                    while (rs.next()) {
+                        long offset = rs.getLong("off");
+                        Timestamp ts = rs.getTimestamp("ts");
+                        String content = rs.getString("content");
+
+                        System.out.println(Thread.currentThread().getName()
+                                + " >>> offset: " + offset
+                                + ", ts: " + formator.format(new Date(ts.getTime()))
+                                + ", content: " + content);
+                        count++;
+                    }
+                    if (count == 10)
+                        break;
+                }
+                System.out.println(Thread.currentThread().getName() + " stopped");
+
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+
+        }
+    }
+
+}