Question

我在prestashop上触发了在产品缺货时更改产品的有效属性：

CREATE TRIGGER change_active AFTER UPDATE ON ps_stock_available
FOR EACH ROW
BEGIN
     UPDATE 
          ps_product_shop 
     SET 
          active=0 
     WHERE 
          id_product IN (SELECT id_product FROM ps_stock_available WHERE quantity=0);
END

它并没有给我任何错误，所以它应该有效但活动属性永远不会改变，即使我将产品的数量设置为零。

编辑：经过多次尝试，我发现在正确的更新后我的触发器没有被调用。这是我的代码，它现在完美无缺。

 CREATE TRIGGER `change_active_after_update` AFTER UPDATE ON `ps_product`
 FOR EACH ROW
 BEGIN
      UPDATE 
           ps_product_shop 
      SET 
           active=0 
      WHERE 
          id_product IN(SELECT id_product FROM ps_stock_available WHERE quantity=0);
END

Answer 1

法规级触发器：

CREATE TRIGGER change_active ON ps_stock_available
FOR UPDATE
BEGIN
     UPDATE 
          ps_product_shop 
     SET 
          active=0
     FROM
        inserted
     WHERE 
          ps_product_shop.id_product = inserted.id_product and
          inserted.quantity=0;
END

行级触发器：

CREATE TRIGGER change_active BEFORE UPDATE ON ps_stock_available
FOR EACH ROW
BEGIN

IF(NEW.quantity = 0) THEN
     UPDATE 
          ps_product_shop 
     SET 
          active=0
     WHERE 
          ps_product_shop.id_product = NEW.id_product;
END IF;
END

Sql触发器不起作用但不会产生任何错误

1 个答案: