Mysql三个触发器到一个触发器

Question

Mysql表不支持创建多个触发器。但是我有三个触发器用于三个更新查询，我如何使用单个触发器运行这些触发器，

错误：#1235-此版本的MySQL还不支持"multiple"一个表的具有相同操作时间和事件的触发器

感谢

 CREATE TRIGGER `update_yeild2` BEFORE UPDATE ON `today_plan`
 FOR EACH ROW SET NEW.yeild = COALESCE((SELECT kiln_master.yeild 
                   FROM kiln_master
                   WHERE NEW.itemno = kiln_master.item  
                   AND  NEW.pattern = kiln_master.pattern
                   LIMIT 1), 0)

CREATE TRIGGER `update_yeild1` BEFORE UPDATE ON `today_plan`
 FOR EACH ROW SET NEW.temp = COALESCE((SELECT kiln_master.temp 
                   FROM kiln_master
                   WHERE NEW.itemno = kiln_master.item  
                   AND  NEW.pattern = kiln_master.pattern
                   LIMIT 1), 0)
CREATE TRIGGER `update_yeild0` BEFORE UPDATE ON `today_plan`
 FOR EACH ROW SET NEW.kiln = COALESCE((SELECT kiln_master.kiln 
                   FROM kiln_master
                   WHERE NEW.itemno = kiln_master.item  
                   AND  NEW.pattern = kiln_master.pattern
                   LIMIT 1), 0)

更新代码：

CREATE TRIGGER `update_yeild2` BEFORE UPDATE ON `today_plan`
 FOR EACH ROW 
BEGIN
SET NEW.yeild = COALESCE((SELECT kiln_master.yeild 
                   FROM kiln_master
                   WHERE NEW.itemno = kiln_master.item  
                   AND  NEW.pattern = kiln_master.pattern
                   LIMIT 1), 0);

  SET NEW.temp = COALESCE((SELECT kiln_master.temp 
                   FROM kiln_master
                   WHERE NEW.itemno = kiln_master.item  
                   AND  NEW.pattern = kiln_master.pattern
                   LIMIT 1), 0);
  SET NEW.kiln = COALESCE((SELECT kiln_master.kiln 
                   FROM kiln_master
                   WHERE NEW.itemno = kiln_master.item  
                   AND  NEW.pattern = kiln_master.pattern
                   LIMIT 1), 0);
END

感谢

工作代码：感谢RandomSeed

delimiter //
CREATE TRIGGER `update_yeild2` BEFORE UPDATE ON `today_plan`
 FOR EACH ROW 
BEGIN
SET NEW.yeild = COALESCE((SELECT kiln_master.yeild 
                   FROM kiln_master
                   WHERE NEW.itemno = kiln_master.item  
                   AND  NEW.pattern = kiln_master.pattern
                   LIMIT 1), 0);

  SET NEW.temp = COALESCE((SELECT kiln_master.temp 
                   FROM kiln_master
                   WHERE NEW.itemno = kiln_master.item  
                   AND  NEW.pattern = kiln_master.pattern
                   LIMIT 1), 0);
  SET NEW.kiln = COALESCE((SELECT kiln_master.kiln 
                   FROM kiln_master
                   WHERE NEW.itemno = kiln_master.item  
                   AND  NEW.pattern = kiln_master.pattern
                   LIMIT 1), 0);
END
//
delimiter ;

Answer 1

只需将三个触发器的操作包含在一个触发器中：

CREATE TRIGGER (...)
FOR EACH ROW
BEGIN
    SET NEW.yeild = (...) ;
    SET NEW.temp = (...) ;
    SET NEW.kiln = (...) ;
END ;