Mysql添加数据时失败 Cannot add or update a child row: a foreign key constraint fails
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用SSM 框架时 添加数据时遇到的问题
Cannot add or update a child row: a foreign key constraint fails
原因：
设置的外键与外键对应的表的主键值不匹配（换句话说你添加外键值在他所对的表中不存在）。
解决方法：
找出不匹配的值修改。
或者清空两表数据。
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