使用flink api把数据写到StarRocks存储系统

使用Flink的JDBC连接器将数据写入StarRocks存储系统中。

以下是一些示例代码，用于将Flink数据流写入StarRocks：

import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Properties;

import org.apache.flink.api.common.functions.RuntimeContext;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
import org.apache.flink.streaming.api.functions.sink.SinkFunction;
import org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction;
import org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.Context;
import org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.Transaction;

import com.starrocks.connector.flink.StarRocksSink;
import com.starrocks.connector.flink.StarRocksSinkBuilder;

public class StarRocksSinkFunction extends RichSinkFunction<Row> implements TwoPhaseCommitSinkFunction<Row, StarRocksSinkFunction.Context, Void> {
    private static final long serialVersionUID = 1L;
    private StarRocksSink sink;
    private PreparedStatement preparedStatement;

    @Override
    public void open(Configuration parameters) throws Exception {
        super.open(parameters);

        Properties properties = new Properties();
        // 设置 StarRocks 连接信息
        properties.setProperty("starrocks.host", "starrocks-host");
        properties.setProperty("starrocks.port", "9030");
        properties.setProperty("user", "user");
        properties.setProperty("password", "password");

        // 构建 StarRocksSink
        StarRocksSinkBuilder builder = new StarRocksSinkBuilder(properties);
        sink = builder.build();
    }

    @Override
    public void invoke(Row value, Context context) throws Exception {
        // 获取 PreparedStatement
        preparedStatement = context.getConnection().prepareStatement("INSERT INTO table_name (column1, column2) VALUES (?, ?)");

        // 设置 PreparedStatement 的参数值
        preparedStatement.setString(1, value.getField(0).toString());
        preparedStatement.setString(2, value.getField(1).toString());

        // 执行 PreparedStatement
        preparedStatement.execute();
    }

    @Override
    public Context beginTransaction() throws Exception {
        // 开启事务
        return new Context();
    }

    @Override
    public void preCommit(Context context) throws Exception {
        // 提交事务前的操作
    }

    @Override
    public void commit(Transaction transaction) throws Exception {
        // 提交事务
        transaction.commit();
    }

    @Override
    public void abort(Transaction transaction) throws Exception {
        // 回滚事务
        transaction.rollback();
    }

    @Override
    public void close() throws Exception {
        super.close();

        // 关闭 StarRocksSink
        if (sink != null) {
            sink.close();
        }

        // 关闭 PreparedStatement
        if (preparedStatement != null) {
            preparedStatement.close();
        }
    }
}

在上述代码中，我们使用了Flink的JDBC连接器，通过StarRocksSinkBuilder来构建StarRocksSink。在invoke方法中，我们获取PreparedStatement，并设置参数值，最后执行PreparedStatement。在事务提交的时候，我们需要实现TwoPhaseCommitSinkFunction接口的preCommit、commit、abort方法，实现事务的提交和回滚。

希望这些代码能够帮助您将数据写入StarRocks存储系统中。