使用Flinkcdc 采集mysql数据

1.下载 Flink CDC 连接器

（1）登录官网下载
https://github.com/apache/flink-cdc/releases
（1）或者虚拟机在线下载
wget https://repo1.maven.org/maven2/com/ververica/flink-sql-connector-mysql-cdc/2.2.1/flink-sql-connector-mysql-cdc-2.2.1.jar

（2）将下载的 JAR 文件放到 Flink 集群的 lib/ 目录 中，重启flink集群。

[root@node1 ~]# cd /export/server/flink
[root@node1 flink]# bin/start-cluster.sh

2.创建mysql表和数据

Drop database if exists test;
Create database test character set utf8;
Use test;
--建表语句：
-- 建表
-- 学生表
CREATE TABLE `Student`(
      `s_id` VARCHAR(20),
      `s_name` VARCHAR(20) NOT NULL DEFAULT '',
      `s_birth` VARCHAR(20) NOT NULL DEFAULT '',
      `s_sex` VARCHAR(10) NOT NULL DEFAULT '',
      PRIMARY KEY(`s_id`)
);
-- 成绩表
CREATE TABLE `Score`(
    `s_id` VARCHAR(20),
    `c_id` VARCHAR(20),
    `s_score` INT(3),
    PRIMARY KEY(`s_id`,`c_id`)
);
-- 插入学生表测试数据
insert into Student values('01' , '赵雷' , '1990-01-01' , '男');
insert into Student values('02' , '钱电' , '1990-12-21' , '男');
insert into Student values('03' , '孙风' , '1990-05-20' , '男');
insert into Student values('04' , '李云' , '1990-08-06' , '男');
insert into Student values('05' , '周梅' , '1991-12-01' , '女');
insert into Student values('06' , '吴兰' , '1992-03-01' , '女');
insert into Student values('07' , '郑竹' , '1989-07-01' , '女');
insert into Student values('08' , '王菊' , '1990-01-20' , '女');
-- 成绩表测试数据
insert into Score values('01' , '01' , 80);
insert into Score values('01' , '02' , 90);
insert into Score values('01' , '03' , 99);
insert into Score values('02' , '01' , 70);
insert into Score values('02' , '02' , 60);
insert into Score values('02' , '03' , 80);
insert into Score values('03' , '01' , 80);
insert into Score values('03' , '02' , 80);
insert into Score values('03' , '03' , 80);
insert into Score values('04' , '01' , 50);
insert into Score values('04' , '02' , 30);
insert into Score values('04' , '03' , 20);
insert into Score values('05' , '01' , 76);
insert into Score values('05' , '02' , 87);
insert into Score values('06' , '01' , 31);
insert into Score values('06' , '03' , 34);
insert into Score values('07' , '02' , 89);
insert into Score values('07' , '03' , 98);

3.使用Flink cdc 采集mysql

!!!注意：开启 binlog 日志功能，如果已开启忽略如下对mysql的配置操作，直接编辑flink sql即可

验证 MySQL 配置： Flink CDC 依赖 MySQL 的 binlog 功能进行数据采集。确保 binlog 已开启，执行以下命令检查：

[root@node1 ~]# mysql -uroot -p

在mysql里面执行，如果返回值为 OFF，需要开启 binlog 功能;
SHOW VARIABLES LIKE 'log_bin';

开启方式：

vi /etc/my.cnf
在[mysqld]下面增加如下代码:
server_id=1
log_bin = mysql-bin
binlog_format = ROW
expire_logs_days = 30

解释：
server_id=1 # MySQL 实例唯一标识符，必须是唯一的
log_bin = mysql-bin # 开启 binlog 功能，文件名为 mysql-bin
binlog_format = ROW # 设置 binlog 格式为 ROW，必需
expire_logs_days = 30 # binlog 日志保留天数，自动清理超过30天的日志

然后重启 MySQL 服务：

systemctl restart mysqld

====================================

启动flink sql客户端

sql-client.sh

在FlinkSQL-Client,执行创建表 mysql_cdc_to_test_Student

CREATE TABLE if not exists mysql_cdc_to_test_Student (
     s_id     STRING,
     s_name   STRING,
     s_birth  STRING,
     s_sex    STRING,
     PRIMARY KEY (`s_id`) NOT ENFORCED
) WITH (
    'connector'= 'mysql-cdc',
    'hostname'= '192.168.77.161',
    'port'= '3306',
    'username'= 'root',
    'password'='123456',
    'server-time-zone'= 'Asia/Shanghai',
    'debezium.snapshot.mode'='initial',
    'database-name'= 'test',
    'table-name'= 'Student'
);

#设置以表形式查看
SET sql-client.execution.result-mode = tableau;

select * from mysql_cdc_to_test_Student;