mysql删除有外链索引数据,Cannot delete or update a parent row: a foreign key constraint fails 问题的解决办法
mysql删除有外链索引数据
Cannot delete or update a parent row: a foreign key constraint fails 问题的解决办法
查询：DELETE FROM goods WHERE goods_id = '11'
错误代码： 1451
Cannot delete or update a parent row: a foreign key constraint fails (webDB.goods_properties_detail, CONSTRAINT FK_rip_43 FOREIGN KEY (goods_id) REFERENCES goods (goods_id))
以上是因为，该条记录的某个字段作为innodb的另外一个表的外链。而在删除操作时会自动检查外链。
解决办法一：先判断删除关联数据，然后再删除(这样比较符合业务逻辑比较安全)。
解决办法二：不检查外链，设置FOREIGN_KEY_CHECKS变量：
SET FOREIGN_KEY_CHECKS = 0;
DELETE FROM goods WHERE goods_id = '11'
删除完成后设置
SET FOREIGN_KEY_CHECKS = 1;
ps：关闭唯一性校验
set unique_checks=0;
set unique_checks=1;
