将字段设置为在UPDATE时自动插入时间戳? [英] Set field to automatically insert time-stamp on UPDATE?

问题描述

我有一个表，其中有一个名为product_price的 DEC 字段，我想添加一个名为price_updated_date的字段.有没有一种方法可以将表设置为在product_price字段更新时自动插入当前时间戳?

I have a table with a DEC field named product_price and I wanted to add a field called price_updated_date. Is there a way to set the table to automatically insert the current time-stamp whenever the product_price field has been updated?

如果没有，是否有办法将其设置为在条目完全更新时插入当前时间戳?

If not, is there a way to set it to insert the current time-stamp any time the entry is updated at all?

在这里使用触发器似乎是最好的选择.我是触发器的新手，在创建它时遇到了一些麻烦.这是我的代码:

It seems like using a trigger is the best option here. I am new to triggers and having some trouble creating it. Here is my code:

CREATE TRIGGER price_update
AFTER UPDATE ON cart_product
FOR EACH ROW
IF(OLD.product_price != NEW.product_price)
THEN
UPDATE cart_product 
SET price_updated_date = CURDATE()
WHERE product_id = NEW.product_id

这给了我这个错误:

#1064-您的SQL语法有错误；检查与您的MySQL服务器版本相对应的手册，以找到在第8行

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 8

推荐答案

是的，在对表进行更新后创建触发器

yup, create trigger after update on your table

CREATE TRIGGER price_update AFTER UPDATE on _table_ FOR EACH ROW UPDATE _table_ SET price_updated_date = CURTIME() where id=NEW.id

这篇关于将字段设置为在UPDATE时自动插入时间戳?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！