Mysql 不寻常的1452错误与学说
我目前正在为一个1452错误(将Symfony2与条令一起使用)绞尽脑汁 情况如下: 我有3张桌子,地点,音乐会和CD,正如预期的那样,音乐会在某个地点举行,CD与音乐会相关,包括一些外键 以下是doctrine为创建数据库而生成的SQL查询:Mysql 不寻常的1452错误与学说,mysql,sql,macos,foreign-keys,mamp,Mysql,Sql,Macos,Foreign Keys,Mamp,我目前正在为一个1452错误(将Symfony2与条令一起使用)绞尽脑汁 情况如下: 我有3张桌子,地点,音乐会和CD,正如预期的那样,音乐会在某个地点举行,CD与音乐会相关,包括一些外键 以下是doctrine为创建数据库而生成的SQL查询: CREATE TABLE CD (id INT AUTO_INCREMENT NOT NULL, concert INT NOT NULL, number INT NOT NULL, INDEX IDX_EB3C8BB0D57C02D2 (concert
CREATE TABLE CD (id INT AUTO_INCREMENT NOT NULL, concert INT NOT NULL, number INT NOT NULL, INDEX IDX_EB3C8BB0D57C02D2 (concert), PRIMARY KEY(id)) ENGINE = InnoDB;
CREATE TABLE Concert (id INT AUTO_INCREMENT NOT NULL, location INT NOT NULL, date DATETIME NOT NULL, name VARCHAR(255) DEFAULT NULL, INDEX IDX_1AC13B4E5E9E89CB (location), PRIMARY KEY(id)) ENGINE = InnoDB;
CREATE TABLE Location (id INT AUTO_INCREMENT NOT NULL, name VARCHAR(40) NOT NULL, city VARCHAR(40) NOT NULL, PRIMARY KEY(id)) ENGINE = InnoDB;
ALTER TABLE CD ADD CONSTRAINT FK_EB3C8BB0D57C02D2 FOREIGN KEY (concert) REFERENCES Concert(id) ON UPDATE CASCADE ON DELETE CASCADE;
ALTER TABLE Concert ADD CONSTRAINT FK_1AC13B4E5E9E89CB FOREIGN KEY (location) REFERENCES Location(id) ON UPDATE CASCADE ON DELETE CASCADE;
事实上,插入位置和连接的音乐会以满足CD的外键是没有问题的:
INSERT INTO Location (id, name, city) VALUES (NULL, 'Church', 'Berlin');
INSERT INTO Concert (id, location, date, name) VALUES (NULL, '1', '2012-06-20 19:30:00', NULL);
但如果我尝试插入CD:
INSERT INTO CD (id ,concert ,number) VALUES (NULL , '1', '1');
我犯了一个著名的错误:
Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`festival`.`cd`, CONSTRAINT `FK_EB3C8BB0D57C02D2` FOREIGN KEY (`concert`) REFERENCES `Concert` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)
所以我尝试了一些技巧:
CREATE TABLE CD (id INT AUTO_INCREMENT NOT NULL, concert INT NOT NULL, number INT NOT NULL, INDEX IDX_EB3C8BB0D57C02D2 (concert), PRIMARY KEY(id)) ENGINE = InnoDB;
CREATE TABLE Concert (id INT AUTO_INCREMENT NOT NULL, location INT NOT NULL, date DATETIME NOT NULL, name VARCHAR(255) DEFAULT NULL, INDEX IDX_1AC13B4E5E9E89CB (location), PRIMARY KEY(id)) ENGINE = InnoDB;
ALTER TABLE CD ADD CONSTRAINT FK_EB3C8BB0D57C02D2 FOREIGN KEY (concert) REFERENCES Concert(id) ON UPDATE CASCADE ON DELETE CASCADE;
CREATE TABLE CD (id INT AUTO_INCREMENT NOT NULL, concert INT NOT NULL, number INT NOT NULL, INDEX IDX_EB3C8BB0D57C02D2 (concert), PRIMARY KEY(id)) ENGINE = InnoDB;
CREATE TABLE Concert (id INT AUTO_INCREMENT NOT NULL, location INT NOT NULL, date DATETIME NOT NULL, name VARCHAR(255) DEFAULT NULL, INDEX IDX_1AC13B4E5E9E89CB (location), PRIMARY KEY(id)) ENGINE = InnoDB;
CREATE TABLE Location (id INT AUTO_INCREMENT NOT NULL, name VARCHAR(40) NOT NULL, city VARCHAR(40) NOT NULL, PRIMARY KEY(id)) ENGINE = InnoDB;
ALTER TABLE CD ADD CONSTRAINT FK_EB3C8BB0D57C02D2 FOREIGN KEY (concert) REFERENCES Concert(id) ON UPDATE CASCADE ON DELETE CASCADE;
ALTER TABLE Concert ADD CONSTRAINT FK_1AC13B4E5E9E89CB FOREIGN KEY (location) REFERENCES Location(id) ON UPDATE CASCADE ON DELETE CASCADE;
ALTER TABLE Concert DROP FOREIGN KEY FK_1AC13B4E5E9E89CB;
ALTER TABLE Concert DROP INDEX IDX_1AC13B4E5E9E89CB;
DROP TABLE Location;
这很有效SET FOREIGN_KEY_CHECKS = 0;
同样的错误- 仅使用小写的表名
- 尝试设置为O或1(但在OSX上,这并不总是可能导致系统区分大小写)
- 降级到MySQL服务器5.5.8(我还没有测试过升级)
.我尝试跳过索引,只使用外键。我没有成功,所以我上一个想法是错误的。好吧,我已经在另一台MySQL服务器上尝试过了,它正在工作。我能注意到的唯一区别是,我运行的是MySQL 5.5.9(失败),成功的尝试是在5.1.44上