關於mysql中[Err] 1451 -Cannot delete or update a parent row: a foreign key constraint fails

[Err] 1451 -Cannot delete or update a parent row: a foreign key constraint fails SET FOREIGN_KEY_CHECKS = 0 //關閉外鍵約束 進行完操作後別忘記了再把外鍵約束重新打開以下是打開數據庫的外鍵約束： SET FOREIGN_KEY_CHECKS = 1 //打開外鍵約束 t_role表： t_r

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