基于Flink CDC datastream mysql to mysql 序列化sql 数据同步
Flink CDC有两种方式同步数据库:
1. 一种是通过FlinkSQL直接输入两表数据库映射进行数据同步,缺点是只能单表进行同步;
2. 一种是通过DataStream开发一个maven项目,打成jar包上传到服务器运行,可以多表多库。
本方案使用DataStream方法,同步两表中的数据。
不需要部署Flink,可单独使用。
主要工作
工程下载连接,点击进入
- 运行简单,只需要配置源数据库与目标数据库信息,运行MysqlCDC文件中的main函数即可使用。
- 修复了mysql数据时区问题、修复了deatatime同步到数据库报错问题
- 使用分为以下三步:
一、 修改源数据库信息
二、 修改目标数据库信息
三、 启动服务
主要源码:
package org.apache.flink;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
import org.jvnet.hk2.annotations.Service;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
/**
* @author dake
*/
@Service
public class MysqlSink extends RichSinkFunction<String> {
private Connection connection = null;
Statement sqlExecute;
@Override
public void open(Configuration parameters) throws Exception {
super.open(parameters);
try {
if (connection == null) {
Class.forName("com.mysql.jdbc.Driver");//加载数据库驱动
connection = DriverManager.getConnection("jdbc:mysql://IP地址:3306/test_target?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8&useSSL=true"
, "账号", "密码");//获取连接
sqlExecute = connection.createStatement();
}
}catch (Exception e){
e.printStackTrace();
}
}
@Override
public void invoke(String value, Context context) {
try {
sqlExecute.execute(value);
}catch (Exception e){
e.printStackTrace();
}
System.out.println("value = " + value);
}
@Override
public void close() throws Exception {
super.close();
if (connection != null) {
connection.close();
}
super.close();
}
}
package org.apache.flink;
import com.ververica.cdc.connectors.mysql.source.MySqlSource;
import com.ververica.cdc.connectors.mysql.table.StartupOptions;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.config.JsonDebeziumDeserializationSchema;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import java.util.Properties;
public class MysqlCDC {
public static void main(String[] args) throws Exception {
MySqlSource<String> mySqlSource = MySqlSource.<String>builder()
.hostname("IP地址")
.port(3306)
.startupOptions(StartupOptions.initial()) //全量同步
.scanNewlyAddedTableEnabled(true) // 开启支持新增表
.databaseList("test_master_resource") // set captured database
.tableList("test_master_resource.test1,test_master_resource.test2") // set captured table
.username("账号")
.password("密码")
.debeziumProperties(getDebeziumProperties())
.serverTimeZone("Asia/Shanghai")
.deserializer(new JsonDebeziumDeserializationSchema()) // converts SourceRecord to JSON String
.build();
Configuration configuration = new Configuration();
// 生产环境夏下,改成参数传进来
// configuration.setString("execution.savepoint.path","file:///tmp/flink-ck/1980d53f557a886f885172bcdf4be8e8/chk-21");
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(configuration);
// enable checkpoint
env.enableCheckpointing(3000);
// 设置本地
env.getCheckpointConfig().setCheckpointStorage("file:///tmp/flink-ck");
env
.fromSource(mySqlSource, WatermarkStrategy.noWatermarks(), "MySQL Source")
.setParallelism(4)
.addSink(new MysqlSink());
// .print("==>").setParallelism(1); // use parallelism 1 for sink to keep message ordering
env.execute("Print MySQL Snapshot + Binlog");
}
}