当在Mysql下删除有一个建有外键的表的数据时可能会报此异常，所以可以启动MySql命令行模式，运行如下的sql语句来关闭外键检测：
SET FOREIGN_KEY_CHECKS = 0;
执行你要的操作后把再把外键检测恢复
SET FOREIGN_KEY_CHECKS = 1;
其他相关的有：
关闭唯一性校验
set unique_checks=0;
set unique_checks=1;
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