SET FOREIGN_KEY_CHECKS = 0 //关闭外键约束
--删除操作--
SET FOREIGN_KEY_CHECKS = 1 //打开外键约束
Cannot delete or update a parent row: a foreign key constraint fails
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SET FOREIGN_KEY_CHECKS = 0 //关闭外键约束
--删除操作--
SET FOREIGN_KEY_CHECKS = 1 //打开外键约束
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