这可能是MySQL在InnoDB中设置了foreign key关联，造成无法更新或删除数据。可以通过设置FOREIGN_KEY_CHECKS变量来避免这种情况。
SET FOREIGN_KEY_CHECKS = 0;
删除完成后设置
SET FOREIGN_KEY_CHECKS = 1;
其他：
关闭唯一性校验
set unique_checks=0;
set unique_checks=1;
MYSQL: Cannot delete or update a parent row: a foreign key constraint fails
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Cannot delete or update a parent row: a foreign key constraint fails....
解决Cannot delete or update a parent row: a foreign key constraint fails的mysql报错
关于mysql中[Err] 1451 -Cannot delete or update a parent row: a foreign key constraint fails
数据库错误Cannot delete or update a parent row: a foreign key constraint fails
ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key constraint fails
mysql删除有外链索引数据,Cannot delete or update a parent row: a foreign key constraint fails 问题的解决办法
[ERR] 1217 - Cannot delete or update a parent row: a foreign key constraint
MySQL主从复制中断，报“Error on master: message (format)='Cannot delete or update a parent row: a foreign key constraint fails' error code=1217” 错误
1452, 'Cannot add or update a child row: a foreign key constraint fails
Cannot add or update a child row: a foreign key constraint fails