Flink的sink实战之四：自定义，灵魂拷问_flink 自定义sink

}

public void setAge(int age) {

this.age = age;

}

public Student(String name, int age) {

this.name = name;

this.age = age;

}

}

4. 创建自定义sink类MySQLSinkFunction.java，这是本文的核心，有关数据库的连接、断开、写入数据都集中在此：

package com.bolingcavalry.customize;

import org.apache.flink.configuration.Configuration;

import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.util.concurrent.TimeUnit;

import java.util.concurrent.locks.ReentrantLock;

public class MySQLSinkFunction extends RichSinkFunction {

PreparedStatement preparedStatement;

private Connection connection;

private ReentrantLock reentrantLock = new ReentrantLock();

@Override

public void open(Configuration parameters) throws Exception {

super.open(parameters);

//准备数据库相关实例

buildPreparedStatement();

}

@Override

public void close() throws Exception {

super.close();

try{

if(null!=preparedStatement) {

p