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;
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