关于mysql中[Err] 1451 -Cannot delete or update a parent row: a foreign key constraint fails
2018-01-13 11:12
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今天在弄mysql的时候突然出现一条这个错误信息，当时就蒙逼了，不过仔细观察一番后发现是外键的原因，这是由于在删除表的时候存在外键关联这时候就会出现删除错误，我们可以暂时把mysq数据库的外键约束给关闭掉，具体方法请看如下：
[Err] 1451 -Cannot delete or update a parent row: a foreign key constraint fails
SET FOREIGN_KEY_CHECKS = 0 //关闭外键约束
进行完操作后别忘记了再把外键约束重新打开以下是打开数据库的外键约束：
SET FOREIGN_KEY_CHECKS = 1 //打开外键约束
努力工作
[Err] 1451 -Cannot delete or update a parent row: a foreign key constraint fails
SET FOREIGN_KEY_CHECKS = 0 //关闭外键约束
进行完操作后别忘记了再把外键约束重新打开以下是打开数据库的外键约束：
SET FOREIGN_KEY_CHECKS = 1 //打开外键约束
努力工作
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