关闭外键约束,输入命令:SET FOREIGN_KEY_CHECKS=0;
SET
FOREIGN_KEY_CHECKS=0;
启动外键约束,输入命令:SET FOREIGN_KEY_CHECKS=1;
FOREIGN_KEY_CHECKS=1;
查看当前是否有外键约束:SELECT @@FOREIGN_KEY_CHECKS;
SELECT
@@FOREIGN_KEY_CHECKS;