使用Apache Flink实现MySQL数据读取和写入的完整指南

import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.source.SourceFunction;
import org.apache.flink.streaming.connectors.mysql.MySqlConnectionData;
import org.apache.flink.streaming.connectors.mysql.MySqlConnector;
import org.apache.flink.streaming.connectors.mysql.MySqlSinkFunction;
import org.apache.flink.streaming.connectors.mysql.table.DynamicTableSink;
import org.apache.flink.types.Row;
 
public class FlinkMySqlExample {
 
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
 
        // 读取MySQL数据
        DataStream<String> inputStream = env.addSource(new MySqlSourceFunction());
 
        // 写入MySQL数据
        inputStream.addSink(MySqlConnector.newBuilder()
                .setDriverName("com.mysql.jdbc.Driver")
                .setUsername("yourUsername")
                .setPassword("yourPassword")
                .setDBUrl("jdbc:mysql://yourJdbcHost:yourJdbcPort/yourDatabase")
                .setTableName("yourTableName")
                .setBatchIntervalMs(2000) // 每2秒执行一次批量写入
                .setBatchSize(1000) // 当批次达到1000条记录时写入数据库
                .build()
        );
 
        env.execute("Flink MySQL Example");
    }
 
    private static class MySqlSourceFunction implements SourceFunction<String> {
        private boolean running = true;
 
        @Override
        public void run(SourceContext<String> ctx) throws Exception {
            // 模拟从MySQL数据库读取数据的逻辑
            while (running) {
                // 假设从数据库中获取到了一条新数据
                String newData = "data from MySQL";
                ctx.collect(newData);
                // 模拟一个数据获取间隔
                Thread.sleep(1000);
            }
        }
 
        @Override
        public void cancel() {
            running = false;
        }
    }
}

这段代码展示了如何使用Apache Flink连接MySQL数据库进行数据读取和写入。首先，我们创建了一个自定义的SourceFunction来模拟从MySQL读取数据。然后，我们使用MySqlConnector来指定如何连接到MySQL数据库，并且如何将数据写入其中。这个例子简单地演示了如何使用Flink的MySQL连接器，并没有包含完整的错误处理或生产就绪的代码。