mysql跨库单表同步_同主机单实例MySQL跨库同步指定表

需求：

同一主机同实例MySQL有A和B两个库，现在需实现test1库中表host和test2库中表host插入、删除、更新单向同步。(table01与table02具有相同表结构)

解决方案：

可以使用触发器实现，举例如下：

1、创建模拟环境

create database test1;

use test1

CREATE TABLE `host` (

`id` tinyint(4) NOT NULL AUTO_INCREMENT,

`host` varchar(20) NOT NULL,

`port` tinyint(2) NOT NULL,

`user` varchar(10) NOT NULL,

`pwd` varchar(20) NOT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8

create database test2;

use test2

CREATE TABLE `host` (

`id` tinyint(4) NOT NULL AUTO_INCREMENT,

`host` varchar(20) NOT NULL,

`port` tinyint(2) NOT NULL,

`user` varchar(10) NOT NULL,

`pwd` varchar(20) NOT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8

2、创建触发器(如果需要双向同步操作，在test2上进行相同操作即可，双向同步时需要注意避免递归死循环)

use test1

DELIMITER //

CREATE TRIGGER Pee_insert_host AFTER INSERT ON host FOR EACH ROW BEGIN INSERT INTO test2.host VALUES (new.id,new.host,new.port,new.user,new.pwd); END;//

CREATE TRIGGER Pee_delete_host AFTER DELETE ON host FOR EACH ROW BEGIN DELETE from test2.host where test2.host.id=old.id; END;//

CREATE TRIGGER Pee_update_host AFTER UPDATE ON host FOR EACH ROW BEGIN UPDATE test2.host SET host=new.host,port=new.port,user=new.user,pwd=new.pwd WHERE test2.host.id=new.id; END;//

DELIMITER ;

3、相关操作

查看触发器：SELECT * FROM information_schema.`TRIGGERS`;

删除触发器：DROP TRIGGER TRIGGER_NAME;