Flink JDBC 驱动程序是一个 Java 库，使客户端能够通过 SQL 网关将 Flink SQL 发送到 Flink 集群。
首先启动：1.flink集群，随意任何集群。
2.启动flink-sql-gateway：
sql-gateway.sh start -Dsql-gateway.endpoint.rest.address=localhost验证sql- gateway
curl http://localhost:8083/v1/info- Maven 依赖项
Flink JDBC 驱动是一个通过 JDBC API 访问 Flink 集群的库。有关 Java 中 JDBC 的一般用法，请参见 JDBC 教程。
- 在项目的pom.xml中添加以下依赖项，或者下载 flink-jdbc-driver-bundle-{VERSION}.jar 并将其添加到你的 Classpath 中。
<dependency><groupId>org.apache.flink</groupId><artifactId>flink-sql-jdbc-driver-bundle</artifactId><version>${flink.version}</version></dependency>- 使用特定 URL 连接到 Java 代码中的 Flink SQL 网关。
- 执行您想要的任何语句。
java">public class Main {public static void main(String[] args) throws SQLException {Properties properties = new Properties();properties.setProperty("table.exec.sink.not-null-enforcer","DROP");DataSource dataSource = new FlinkDataSource("jdbc:flink://ip:8083", properties);try (Connection connection = dataSource.getConnection()) {try (Statement statement = connection.createStatement()) {/*statement.execute("CREATE TABLE student (\n" +" id VARCHAR(255),\n" +" sid VARCHAR(255),\n" +" name VARCHAR(255),\n" +" PRIMARY KEY (id) NOT ENFORCED" +") WITH (\n" +" 'connector' = 'jdbc',\n" +" 'url' = 'jdbc:mysql://ip:3306/test?characterEncoding=utf-8&useSSL=false&allowPublicKeyRetrieval=true',\n" +" 'username' = 'test',\n" +" 'password' = 'test@123',\n " +" 'table-name' = 'student' " +")");statement.execute("CREATE TABLE students (\n" +" id VARCHAR(255),\n" +" sid VARCHAR(255),\n" +" name VARCHAR(255),\n" +" PRIMARY KEY (id) NOT ENFORCED" +") WITH (\n" +" 'connector' = 'jdbc',\n" +" 'url' = 'jdbc:mysql://ip:3306/test?characterEncoding=utf-8&useSSL=false&allowPublicKeyRetrieval=true',\n" +" 'username' = 'test',\n" +" 'password' = 'test@123',\n " +" 'table-name' = 'students' " +")");*/statement.execute("CREATE TABLE students (\n" +" name STRING,\n" +" sid BIGINT,\n" +" PRIMARY KEY (sid) NOT ENFORCED" +") WITH (\n" +" 'connector' = 'paimon',\n" +" 'path' = 'hdfs://ip:8072/paimon/hive/olap_mz.db/students'\n" +")");//statement.execute("INSERT INTO students VALUES ('1', 's1', 'Hi'), ('2', 's2','Hello')");try (ResultSet rs = statement.executeQuery("SELECT st.sid,count(st.sid) as coun FROM students st group by st.sid")) {while (rs.next()) {System.out.println(rs.getLong(1) +","+rs.getLong(2) );}statement.close();}connection.close();}}}
}注释的是mysql的，运行的是paimon的。
