Flink 写数据到MySql (JDBC Sink)

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-scala_2.11</artifactId>
            <version>1.10.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.flink/flink-streaming-scala -->
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-streaming-scala_2.11</artifactId>
            <version>1.10.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-connector-kafka-0.11_2.11</artifactId>
            <version>1.10.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>

package com.kpwong.sink

import java.sql.{Connection, DriverManager, PreparedStatement}

import org.apache.flink.configuration.Configuration
import org.apache.flink.streaming.api.functions.sink.{RichSinkFunction, SinkFunction}
import org.apache.flink.streaming.api.scala.{DataStream, StreamExecutionEnvironment}
import org.apache.flink.streaming.api.scala._

object JDBCSinkTest {
  def main(args: Array[String]): Unit = {
    val env: StreamExecutionEnvironment = StreamExecutionEnvironment.getExecutionEnvironment
    env.setParallelism(1)

    val socketDS: DataStream[String] = env.socketTextStream("hadoop202",9999)

    //sink

    socketDS.addSink(new MyJDBCSink())


    env.execute()
  }

}
//注意 必须继承富函数类,这样才有生命周期管理函数
class MyJDBCSink extends  RichSinkFunction[String]{
  //定义SQL 链接 预编译器
  var conn: Connection =_
  var insertSql: PreparedStatement=_

  //创建链接和预编译语句
  override def open(parameters: Configuration): Unit = {
    super.open(parameters)
    conn = DriverManager.getConnection("jdbc:mysql://hadoop102:3306/test","root","000000")

    insertSql= conn.prepareStatement("insert into flink(socket) values (?)")

  }

  override def invoke(value: String, context: SinkFunction.Context[_]): Unit = {

//    super.invoke(value, context)
    insertSql.setString(1,value)
    insertSql.execute()
  }

  override def close(): Unit = {
//    super.close()
    insertSql.close()
    conn.close()
  }

}