mysql 查询

[qqsweb]

UPDATE `ecs_goods_gallery` SET `thumb_url` = 'http://www.123456c.com/proimg/200822034221.jpg' WHERE `img_id` =12 LIMIT 1 ;


如果我要判断http://www.123456c.com/proimg/200822034221.jpg是否存在 存在的就是重复 就不提交 怎么写查询

[dzxccsu]

如果单纯用SQL语句判断的话,好象没什么好方法,LZ可以用PHP+mysql先判断是否有这个值,在进行是否更新!

[阿_布]

UPDATE ecs_goods_gallery 
SET thumb_url = 'http://www.123456c.com/proimg/200822034221.jpg' 
WHERE img_id=12 AND thumb_url != 'http://www.123456c.com/proimg/200822034221.jpg' ;