MySql触发器实现数据同步学习

触发器实现：（增、删、改操作事件触发数据单向同步）
数据库触发器教程：https://www.cnblogs.com/phpper/p/7587031.html
同步代码：

DELIMITER $
DROP TRIGGER IF EXISTS insertdata;
CREATE TRIGGER insertdata AFTER INSERT ON repair.user FOR EACH ROW
BEGIN
DECLARE s1 INT();
DECLARE s2 VARCHAR();
SET s1=NEW.id;
SET s2=NEW.name;
INSERT INTO sale.user(id,name) VALUES(s1,s2);
END $

DELIMITER $
DROP TRIGGER IF EXISTS updatedata;
CREATE TRIGGER updatedata AFTER UPDATE ON repair.user FOR EACH ROW
BEGIN
DECLARE s1 INT();
DECLARE s2 VARCHAR();
SET s1=OLD.id;
SET s2=NEW.name;
UPDATE sale.user a SET a.name=s2 WHERE a.id=s1;
END $

DELIMITER $
DROP TRIGGER IF EXISTS deletedata;
CREATE TRIGGER deletedata AFTER DELETE ON repair.user FOR EACH ROW
BEGIN
DECLARE s1 INT();
DECLARE s2 VARCHAR();
SET s1=OLD.id;
SET s2=OLD.name;
DELETE FROM sale.user WHERE id=s1;
END $