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Flink Mybatis如何整合

小樊
98
2024-07-20 13:52:43

Flink和MyBatis的整合可以通過自定義Source實現(xiàn)。下面是一個簡單的示例：

  1. 首先，創(chuàng)建一個MyBatis的Mapper接口和對應(yīng)的Mapper XML文件，如下所示：
// UserMapper.java
public interface UserMapper {
    User getUserById(int id);
}

<!-- UserMapper.xml -->
<mapper namespace="com.example.UserMapper">
    <select id="getUserById" resultType="com.example.User">
        SELECT * FROM users WHERE id = #{id}
    </select>
</mapper>
  1. 創(chuàng)建一個自定義的Source，用于從MyBatis中讀取數(shù)據(jù)，并將數(shù)據(jù)發(fā)送到Flink的DataStream中：
public class MyBatisSourceFunction implements SourceFunction<User> {

    private boolean running = true;
    private SqlSessionFactory sqlSessionFactory;

    public MyBatisSourceFunction(SqlSessionFactory sqlSessionFactory) {
        this.sqlSessionFactory = sqlSessionFactory;
    }

    @Override
    public void run(SourceContext<User> ctx) throws Exception {
        try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
            int userId = 1;
            while (running) {
                User user = userMapper.getUserById(userId);
                ctx.collect(user);
                userId++;
            }
        }
    }

    @Override
    public void cancel() {
        running = false;
    }
}
  1. 在Flink程序中，創(chuàng)建一個ExecutionEnvironment，并使用自定義的Source作為數(shù)據(jù)源：
public static void main(String[] args) throws Exception {
    // 創(chuàng)建MyBatis的SqlSessionFactory
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("mybatis-config.xml"));

    // 創(chuàng)建ExecutionEnvironment
    final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

    // 添加自定義的Source作為數(shù)據(jù)源
    DataStream<User> stream = env.addSource(new MyBatisSourceFunction(sqlSessionFactory));

    // 打印數(shù)據(jù)流
    stream.print();

    // 執(zhí)行Flink程序
    env.execute("MyBatisSourceFunction Example");
}

通過以上步驟，就可以實現(xiàn)Flink和MyBatis的整合。當(dāng)然，實際應(yīng)用中可能需要根據(jù)具體需求進行定制和調(diào)整。

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