在删除主表数据时,报了一个异常

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

原因是主表中还包含字表的数据,不能删除与这张表或数据有关联的字段,所以无法删除

解决办法:在创建数据库的外键时,将删除的动作配置由RESTRICT改成cascade,就可以解决.

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