flink-jdbc-driver - 技术栈

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：

XML 复制代码

sql-gateway.sh start -Dsql-gateway.endpoint.rest.address=localhost

验证sql- gateway

复制代码

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 复制代码

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。