mybatis在insert时报Cannot add or update a child row: a foreign key constraint fails (`yanchangzichan`.`productstatusrecord`, CONSTRAINT `p_cu` FOREIGN KEY (`cid`) REFERENCES `customer` (`cid`))错误，重点在“a foreign key constraint fails”，说明主表和附表有外键关联，无法插入为空的值。解决方案：1）：取消表的外键 ，2）插入值不能有空值