mysql - 删除后触发THEN UPDATE mysql

Question

我想在删除orders_foods后触发

我的逻辑是:从orders_foods中删除，其中id=;id然后更新订单价格price = sum (orders_foods.price)其中id=orders_foods.order_id

这是我之前尝试过的代码，但出现错误#1363 -

Delimiter //  
CREATE TRIGGER ubah_tot_harga AFTER DELETE ON orders_foods
FOR EACH ROW
BEGIN
    DECLARE harga_1 int default 0;
     SELECT SUM(price) into harga_1 fROM `orders_foods` WHERE order_id = new.order_id;

     update  orders
      set price= harga_1
      where id=old.order_id;
      END
//
delimiter ;

orders table orders_foods table

Answer 1

您需要使用old.order_id，而不是new.order_id。因为删除后没有new.order_id，只有old.order_id。

Delimiter //  
CREATE TRIGGER ubah_tot_harga AFTER DELETE ON orders_foods
FOR EACH ROW
BEGIN
    DECLARE harga_1 int default 0;
     SELECT SUM(price) into harga_1 fROM `orders_foods` WHERE order_id = old.order_id;

     update  orders
      set price= harga_1
      where id=old.order_id;
      END
//
delimiter ;