报错信息如下: (pymysql.err.IntegrityError) (1452, u'Cannot add or update a child row: a foreign key constraint fails 解决办法: SET FOREIGN_KEY_CHECKS = 0; # 临时取消外键约束 SET FOREIGN_KEY_CHECKS = 1; # 开启外键约束 添加之前临时取消一下外键约束,添加好数据之后,再将外键约束改回来就可以...
代码前段插入: SET@OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT; SET@OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS; SET@OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION; SETNAMESutf8; SET@OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0; SET@OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS...
今天给表中的数据创建外键时,一直报 Cannot add or update a child row: a foreign key constraint fails (company.userinfo, CONSTRAINT afsfasd FOREIGN KEY (ded) REFERENCES detail (ded)) 这是因为你在创建 外键时,表中已经有了数据,并且两个表中的外键不一致,我...[Err] 1452-Cannot add or update a...
法一: show create table 表名; 法二:show table status from 数据库 where name=‘表名’; 法三:use information_schema; select table_catalog,table_schema,table_name,engine from tables where table_schema=‘数据库名’ and table_name=‘表名’; 原因三: 设置的外键与另一个表中的唯一索引列(一般...
运行代码出现如下错误提示:Cannot delete or update a parent row: a foreign key constraint fails下面关于
ERROR 1701 (42000): Cannot truncate a table referenced in a foreign key constraint (`platform`.`app04news_news`, CONSTRAINT `app04news_news_user_id_d2929af9_fk_app04news_userinfo_id`) 问题原因 因为数据库存在主外键关系,不能进行删除或者截断。此时只需要解除主外键约束,就可以清空或者截断数据库...
Hibernate: A foreign key constraint fails Ask Question Asked13 years, 4 months ago Modified12 years, 1 month ago Viewed4k times The following are the SQL statements generated by Hibernate Hibernate: insert intoHOSPITAL_ADDRESS(DOOR_NO,STREET,REFERENCE_LANDMARK,HASH) values (?,?,?,?)Hibernate:...
Java报错:Cannot delete or update a parent row: a foreign key constraint fails 在使用Java进行数据库操作时,我们有时会遇到报错信息"Cannot delete or update a parent row: a foreign key constraint fails",这是由于外键约束引起的。本文将解释什么是外键约束、为什么会报错以及如何解决这个问题。
Cannot delete or update a parent row: a foreign key constraint fails Not sure why I'm getting this error. Any clue? Code below: -- DROP EXISTING TABLES -- DROP TABLE IF EXISTS `category`; DROP TABLE IF EXISTS `format`; DROP TABLE IF EXISTS `customer`; DROP TABLE IF EXISTS `rentals...
Mysql错误1452 – Cannot add or update a child row: a foreign key constraint fails 原因及解决方法[通俗易懂] 大家好,又见面了,我是你们的朋友全栈君。 报错的原因大概分为三种: 原因一: 添加的外键列与另一个表的唯一索引列(一般是主键)的数据类型不同原因...