Question

下面是代码接下来的想法：在表订单中插入记录后，我需要获取last_orderid，对于该orderid，我需要来自同一表的餐厅名称，使用功能和餐厅名称，我将获得驾驶员姓名作为函数输出，对于该驾驶员姓名，我将找到车号在表驱动程序中，并且如果is_delivery = Yes，则该值希望以表顺序插入car_number列中。

我尝试最初更改表，但是主要问题是我需要功能的精确餐厅名称。

CREATE DEFINER=root@localhost TRIGGER select_driver AFTER INSERT ON orders 
FOR EACH ROW 
BEGIN
    set @orderid = (select max(order_id) from orders); 
    SET @restauranatname=(select Restaurant_Name from orders WHERE order_id=@orderid); 
    set @drivername = (SELECT find_lazy_driver('@restauranatname')); 
    SET @car_number = (SELECT car_number FROM driver WHERE driver_name=@drivername); 
    update orders 
    SET car_number= @car_number 
    WHERE Order_ID = @orderid; 
END

下面的代码在SQL中效果很好，但是在任何触发器中都会产生问题-我在插入以及更新之前/之后都尝试过

  set @orderid = (select max(order_id) from orders);
  SET @restauranatname=(select Restaurant_Name from orders WHERE 
  order_id=@orderid);
  set @drivername = (SELECT `find_lazy_driver`(@restauranatname));
  SET @car_number = (SELECT car_number FROM driver WHERE 
  driver_name=@drivername);
  UPDATE orders
  SET car_number= @car_number
  WHERE order_id=@orderid ;

在MariaDB中触发

0 个答案: