需求:ide
同一主機同實例MySQL有A和B兩個庫,如今需實現test1庫中表host和test2庫中表host插入、刪除、更新單向同步。(table01與table02具備相同表結構)spa
解決方案:orm
能夠使用觸發器實現,舉例以下:遞歸
一、建立模擬環境同步
create database test1;it
use test1io
CREATE TABLE `host` (table
`id` tinyint(4) NOT NULL AUTO_INCREMENT,form
`host` varchar(20) NOT NULL,class
`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
二、建立觸發器(若是須要雙向同步操做,在test2上進行相同操做便可,雙向同步時須要注意避免遞歸死循環)
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 ;
三、相關操做
查看觸發器:SELECT * FROM information_schema.`TRIGGERS`;
刪除觸發器:DROP TRIGGER TRIGGER_NAME;