flink读取kafka实时数据sink到mysql(scala版)

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mo</groupId>
    <artifactId>Flink</artifactId>
    <version>1.0-SNAPSHOT</version>


    <dependencies>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-nop</artifactId>
            <version>1.7.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-jdbc_2.11</artifactId>
            <version>1.10.0</version>
        </dependency>


        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <version>5.1.27</version>

        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-scala_2.11</artifactId>
            <version>1.10.0</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>1.10.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-connector-kafka-0.11_2.11</artifactId>
            <version>1.10.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-connector-elasticsearch6_2.11</artifactId>
            <version>1.10.0</version>
        </dependency>


        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-statebackend-rocksdb_2.11</artifactId>
            <version>1.10.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-table-planner_2.11</artifactId>
            <version>1.10.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-table-planner-blink_2.11</artifactId>
            <version>1.10.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-table-api-scala-bridge_2.11</artifactId>
            <version>1.10.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-csv</artifactId>
            <version>1.10.0</version>
        </dependency>



    </dependencies>

    <build>
        <plugins>
            <!-- 该插件用于将Scala代码编译成class文件 -->
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>3.4.6</version>
                <executions>
                    <execution>
                        <!-- 声明绑定到maven的compile阶段 -->
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.0.0</version>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>



</project>

需求:统计数据流中ID为1的温度计和相对应的温度值
数据流(id,timeStamp,Temp)=>(id,Temp)

package com.mo.flinkTable

import org.apache.flink.streaming.api.scala._
import org.apache.flink.table.api._
import org.apache.flink.table.api.scala._
import org.apache.flink.table.descriptors._

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

    val blinkStreamSettings = EnvironmentSettings.newInstance()
      .useBlinkPlanner()
      .inStreamingMode()
      .build()
    val tableEnv = StreamTableEnvironment.create(env, blinkStreamSettings)

//    val tableEnv = StreamTableEnvironment.create(env)

        tableEnv.connect(new Kafka()
          .version("0.11")
          .topic("thermometer")
          .property("zookeeper.connect", "hadoop102:2181")
          .property("zookeeper.connect", "hadoop103:2181")
          .property("zookeeper.connect", "hadoop104:2181")
          .property("bootstrap.servers", "hadoop102:9092")
          .property("bootstrap.servers", "hadoop103:9092")
          .property("bootstrap.servers", "hadoop104:9092")
        )
          .withFormat(new Csv())
          .withSchema(new Schema()
            .field("id", DataTypes.STRING())
            .field("timestamp", DataTypes.BIGINT())
            .field("Temp", DataTypes.DOUBLE())
          )
          .createTemporaryTable("kafkaInputTable")

    val Result : Table = tableEnv.from("kafkaInputTable")
    val kafkaEndResult = Result.select("id , Temp")
      .filter("id == '1' ")

    kafkaEndResult.toAppendStream[(String,Double)].print("kafkaDataTest")
    
    val sinkDDL : String =
      """
        |create table kafkaOutputTable (
        | id varchar ,
        | temp double
        |) with (
        | 'connector.type' = 'jdbc',
        | 'connector.url' = 'jdbc:mysql://localhost:3306/test',
        | 'connector.table' = 'thermometer',
        | 'connector.driver' = 'com.mysql.jdbc.Driver',
        | 'connector.username' = 'root',
        | 'connector.password' = '123456'
        |)
     """.stripMargin
     //注意thermometer是真正存在mysql中的表,而kafkaOutputTable只是在流式环境中存在的与mysql中所对应的表

    tableEnv.sqlUpdate(sinkDDL) //执行DDL创建kafkaOutputTable表
    kafkaEndResult.insertInto("kafkaOutputTable")
    env.execute("kafka to mysql test")

  }
}

liunx上开启zoookeeper和kafka,创建一个thermometer主题,注意mysql要提前创建好代码中定义好的thermometer表和相应字段,运行代码可以看到kafka的数据已经实时的存在了mysql中.

.wu