MySQL重复更新密钥 [英] MySQL on duplicate key update

问题描述

如果我有这样的查询，我怎么可以引用我已经在update语句中给出的值，这样我不需要再次插入相同的数据来查询？示例我想使用'xxx'更新col1值，但现在我需要在重复的语句中再次输入'xxx'。有没有反驳这些值在重复的语句？

If I have query like this, how can I refer to values I have already given in update statement, so that I don't need to insert same data to query again? Example I would like to update col1 value with 'xxx', but now I need to enter 'xxx' again in duplicate statement. Is there anyway to refer those values in duplicate statement?

INSERT INTO TABLENAME(col1, col2) 
VALUES (’xxx’, ‘yyy’) 
ON DUPLICATE KEY UPDATE col1 = ‘zzz’

推荐答案

这应该工作，更优雅一点：

This should work and is a little more elegant:

INSERT INTO TABLENAME(col1, col2) 
VALUES (’xxx’, ‘yyy’) 
ON DUPLICATE KEY UPDATE col1 = VALUES(col1)

请注意，您不需要更新该行的主键部分。我们知道这是一样的，因为碰撞。

Note that you don't need to update the primary key part of the row. We know that's the same because there was a collision.

这篇关于MySQL重复更新密钥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！