Flink from introduction to Zhenxiang (11. Self defined data output of sink - Taking writing to MySQL as an example)

8133ea6r 2020-11-08 12:06:37
flink introduction zhenxiang self defined

The goal is : Flink from txt The data is read from the file , Write to mysql in

Environmental preparation : without mysql, You can install it according to the following command

wget https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm
yum -y install mysql80-community-release-el7-3.noarch.rpm
yum install mysql-community-server -y
systemctl restart mariadb

see mysql Default password

[[email protected]localhost ~]# grep 'temporary password' /var/log/mysqld.log
2020-11-04T02:05:26.432219Z 6 [Note] [MY-010454] [Server] A temporary password is generated for [email protected]localhost: qCk4b_3iEE;V

modify mysql Default password

mysql -uroot -p'qCk4b_3iEE;V'
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '[email protected]';
Query OK, 0 rows affected (0.03 sec)

Allow all hosts to connect to mysql

mysql> update user set host = '%' where user = 'root';
systemctl restart mysqld

establish mysql Database and table of

establish test database :

create database test default character set utf8mb4 collate utf8mb4_unicode_ci;

Create table

-- ----------------------------
-- Table structure for sensor_temp
-- ----------------------------
DROP TABLE IF EXISTS `sensor_temp`;
CREATE TABLE `sensor_temp` (
`ids` varchar(100) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
`temp` double(10,0) DEFAULT NULL

Create a new one scala object class ,JdbcSink

package com.mafei.sinktest
import java.sql.{Connection, DriverManager, PreparedStatement}
import org.apache.flink.configuration.Configuration
import org.apache.flink.streaming.api.functions.sink.RichSinkFunction
import org.apache.flink.streaming.api.scala.{StreamExecutionEnvironment, createTypeInformation}
object JdbcSink {
def main(args: Array[String]): Unit = {
// Create an execution environment 
val env = StreamExecutionEnvironment.getExecutionEnvironment
val inputStream = env.readTextFile("/opt/java2020_study/maven/flink1/src/main/resources/sensor.txt")
// First convert to sample class type 
val dataStream = inputStream
.map(data => {
val arr = data.split(",") // according to , Split data , To get the results 
SensorReadingTest5(arr(0), arr(1).toLong, arr(2).toDouble) // Generate data for a sensor class , Parameters are passed in the middle toLong and toDouble Because the default split is string category 
dataStream.addSink(new MyJdbcSinkFunc())
class MyJdbcSinkFunc() extends RichSinkFunction[SensorReadingTest5]{
// Define connections 、 Precompiled sentences 
var conn: Connection = _
var insertStmt: PreparedStatement = _
var updateStmt: PreparedStatement = _
override def open(parameters: Configuration): Unit = {
conn = DriverManager.getConnection("jdbc:mysql://","root","[email protected]")
insertStmt = conn.prepareStatement("INSERT INTO `sensor_temp`(`ids`, `temp`) VALUES ( ?, ?)")
updateStmt = conn.prepareStatement("update sensor_temp set temp= ? where ids= ? ")
override def invoke(in: SensorReadingTest5): Unit = {
if (updateStmt.getUpdateCount ==0){
println(" Insert operation performed ...")
override def close(): Unit = {

Code structure and effect :

Flink From introduction to Zhenxiang (11、Sink Custom data output - To write MySQL For example )

mysql The rendering of the data in :

Flink From introduction to Zhenxiang (11、Sink Custom data output - To write MySQL For example )


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