MYSQL: Cannot delete or update a parent row: a foreign key constraint fails

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MYSQL: Cannot delete or update a parent row: a foreign key constraint fails

 

这可能是mysql在InnoDB中设置了foreign key关联，造成无法更新或删除数据。可以通过设置FOREIGN_KEY_CHECKS变量来避免这种情况。 


SET FOREIGN_KEY_CHECKS = 0; 
删除完成后设置 
SET FOREIGN_KEY_CHECKS = 1; 


其他： 
关闭唯一性校验 
set unique_checks=0; 
set unique_checks=1;

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