先准备一个文件里面数据有：

a, 1547718199, 1000000
b, 1547718200, 1000000
c, 1547718201, 1000000
d, 1547718202, 1000000
e, 1547718203, 1000000
f, 1547718204, 1000000
g, 1547718205, 1000000
h, 1547718210, 1000000
i, 1547718210, 1000000
j, 1547718210, 1000000

 scala代码：

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._

  case class SensorReading(name: String, timestamp: Long, salary: Double)
  object a1 {
    def main(args: Array[String]): Unit = {
      val env = StreamExecutionEnvironment.getExecutionEnvironment
      env.setParallelism(1)
      //数据源
      val dataStream: DataStream[String] = env.readTextFile("D:\\wlf.备份24.1.3\\wlf\\ideaProgram\\bbbbbb\\src\\main\\resources\\salary.txt")
      val stream = dataStream.map(data => {
        val splited = data.split(",")
        SensorReading(splited(0), splited(1).trim.toLong, splited(2).trim.toDouble)
      })
      stream.addSink( new JDBCSink() )
      env.execute("  job")
    }
  }


  class JDBCSink() extends RichSinkFunction[SensorReading]{
    // 定义sql连接、预编译器
    var conn: Connection = _
    var insertStmt: PreparedStatement = _
    var updateStmt: PreparedStatement = _
    // 初始化，创建连接和预编译语句
    override def open(parameters: Configuration): Unit = {
      super.open(parameters)
      conn = DriverManager.getConnection("jdbc:mysql://bigdata1:3306/flink?serverTimezone=UTC", "root", "123456")
      insertStmt = conn.prepareStatement("INSERT INTO salary_table (name, salary) VALUES (?,?)")
      updateStmt = conn.prepareStatement("UPDATE salary_table SET salary = ? WHERE name = ?")
    }
    override def invoke(value: SensorReading): Unit = {
      // 执行更新语句
      updateStmt.setString(1, value.name)
      updateStmt.setDouble(2, value.salary)
      updateStmt.execute()
      // 如果update没有查到数据，那么执行插入语句
      if( updateStmt.getUpdateCount == 0 ){
        insertStmt.setString(1, value.name)
        insertStmt.setDouble(2, value.salary)
        insertStmt.execute()
      }
    }
    // 关闭时做清理工作
    override def close(): Unit = {
      insertStmt.close()
      updateStmt.close()
      conn.close()
    }
}

MySQL中查看表 ：