标签: mysql-error-1451

这是我发生的事情的一个例子:

CREATE TABLE Parent (id BIGINT NOT NULL,
  PRIMARY KEY (id)) ENGINE=InnoDB;

CREATE TABLE Child (id BIGINT NOT NULL,
  parentid BIGINT NOT NULL,
  PRIMARY KEY (id),
  KEY (parentid),
  CONSTRAINT fk_parent FOREIGN KEY (parentid) REFERENCES Parent (id) ON DELETE CASCADE) ENGINE=InnoDB;

CREATE TABLE Uncle (id BIGINT NOT NULL,
  parentid BIGINT NOT NULL,
  childid BIGINT NOT NULL,
  PRIMARY KEY (id),
  KEY (parentid),
  KEY (childid),
  CONSTRAINT fk_parent_u FOREIGN KEY (parentid) REFERENCES Parent (id) ON DELETE CASCADE,
  CONSTRAINT fk_child FOREIGN KEY (childid) REFERENCES Child …

CREATE  TABLE `categories` (
  `idcategories` INT NOT NULL AUTO_INCREMENT ,
  `idparent` INT NULL ,
  `description` VARCHAR(45) NULL ,
  PRIMARY KEY (`idcategories`) );

ALTER TABLE `categories` 
  ADD CONSTRAINT `FK_idparent`
  FOREIGN KEY (`idparent` )
  REFERENCES `ilmercatinodelpulcino`.`categories` (`idcategories` )
  ON DELETE CASCADE
  ON UPDATE CASCADE
, ADD INDEX `FK_idparent` (`idparent` ASC) ;

INSERT INTO `categories` (`idcategories`, `description`)
    VALUES (1, 'cat1');
INSERT INTO `categories` (`idcategories`, `idparent`, `description`)
    VALUES (2, 1, 'cat1_child');

因此,此表表示一个类别,具有ID和自我指向的父ID.我插入了一个类别cat1和一个子类别cat1_child,其父ID为cat1.

现在,我希望能够将cat1的idcategory从1更改为10,因为我在更新CASCADE上设置了外键,我希望cat1_child的idparent也将设置为10.但当我这样做时:

UPDATE `categories` SET `idcategories`=10 WHERE `idcategories`='1';

我收到一个错误:

错误1451:无法删除或更新父行:外键约束失败(categories,CONSTRAINT FK_idparent …

我有代码1451的mysql错误.

无法删除或更新父行:外键约束失败(online_store_admin.osa_admin_logs,CONSTRAINT fk_admins_logsFOREIGN KEY(aid)REFERENCES osa_admins(aid))

这里是sql语句:

drop table if exists osa_admins;
create table if not exists osa_admins(
 aid int unsigned not null auto_increment, 
 uid varchar(50) not null, 
 pass char(41) not null, 
 erp_id int unsigned not null, 
 last_login int unsigned not null,
 is_block tinyint unsigned not null,
 menus varchar(50) not null,
 is_login tinyint unsigned not null,
 ip_login char(15) not null,

 constraint idx_osa_admins primary key using btree(aid)
);
insert into osa_admins value …

亲爱的,我在MySQL中遇到问题:我无法DELETE FROM users where user_id ='1';在MySQL CLI中执行.所以我试着在phpMyAdmin中:使用GUI删除一行,我得到了这个:

SQL查询:

DELETE FROM `health_portal`.`users` WHERE `users`.`user_id` =1

MySQL说:文档

Cannot delete or update a parent row: a foreign key constraint fails (`health_portal`.`users`, CONSTRAINT `users_ibfk_2` FOREIGN KEY (`doctor_id`) REFERENCES `users` (`user_id`)) 

我在Mysql网站上查找了这个错误并得到了:错误:1451 SQLSTATE:23000(ER_ROW_IS_REFERENCED_2)

消息:无法删除或更新父行:外键约束失败(%s)

我不知道这里有什么问题,希望有人能给我一个提醒.

很多thx!