关于MySql删除某一条记录外键约束删除失败解决方案

mysql外键约束删除失败

错误信息如下：

错误1（SSM控制台报错）

Servlet.service() for servlet [ttms] in context with path [/ttms_dl] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException:

Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (ttms.collect_scenic, CONSTRAINT collect1 FOREIGN KEY (alx_uid) REFERENCES alx_user (alx_uid))

The error may involve com.ttms.core.dao.AlxUserDao.deleteAlxUser-Inline

The error occurred while setting parameters

SQL: delete from alx_user where alx_uid=?

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (ttms.collect_scenic, CONSTRAINT collect1 FOREIGN KEY (alx_uid) REFERENCES alx_user (alx_uid))

; SQL []; Cannot delete or update a parent row: a foreign key constraint fails (ttms.collect_scenic, CONSTRAINT collect1 FOREIGN KEY (alx_uid) REFERENCES alx_user (alx_uid)); nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (ttms.collect_scenic, CONSTRAINT collect1 FOREIGN KEY (alx_uid) REFERENCES alx_user (alx_uid))] with root cause com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (ttms.collect_scenic, CONSTRAINT collect1 FOREIGN KEY (alx_uid) REFERENCES alx_user (alx_uid))

错误2（navicat删除时报错）

使用以下方法无效的：

“先取消表的外键约束，再删除表的数据，最后恢复表的外键约束 SET FOREIGN_KEY_CHECKS = 0; 删除操作; SET FOREIGN_KEY_CHECKS = 1; ”

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解决方案：

1.标题找到设置外键的表

RESTRICT：限制 eg:

2.修改为

CASCADE：级联 点左上角保存即可

成功删除效果：

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