mysql - MYSQL 触发查询

Question

我正在尝试创建一个触发器来更新两个独立数据库之间的数量。此查询成功运行，但是当我在 mysql 中显示触发器时，它会显示一个空集。任何帮助将非常感激。

delimiter $$ CREATE TRIGGER `quantity_to_clb` AFTER UPDATE ON product 
FOR EACH ROW BEGIN UPDATE cl_boutique.product AS clb 
LEFT JOIN cherrylane.product AS cl 
ON clb.model = cl.code SET clb.quantity = cl.available
 WHERE clb.model = cl.code
 END $$ 
delimiter ;

Answer 1

那是因为您的代码有两个语法错误：

delimiter $$ --delimiter statements need to be on separate lines
CREATE TRIGGER `quantity_to_clb` AFTER UPDATE ON product 
FOR EACH ROW BEGIN 
  UPDATE cl_boutique.product AS clb 
  LEFT JOIN cherrylane.product AS cl 
  ON clb.model = cl.code SET clb.quantity = cl.available
   WHERE clb.model = cl.code; -- ; was needed here
END $$ 
delimiter ;