我正在写敏捷 Yii 书。
无论如何，我正在尝试执行此命令：
INSERT INTO tbl_project_user_assignment (project_id, user_id) values ('1','1'), ('1','2');
我得到这个错误：
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`trackstar_dev`.`tbl_project_user_assignment`, CONSTRAINT `FK_project_user` FOREIGN KEY (`project_id`) REFERENCES `tbl_project` (`id`) ON DELETE CASCADE)
所以..我想让我们看看 tbl_project 表是否有 project_id=1。快速 SELECT * FROM tbl_project; 并且项目存在。
好的，那么让我们检查一下用户， SELECT * FROM tbl_user; 是的 2 个用户，ID 为 1 和 2。
我究竟做错了什么？有错别字吗？敏捷 yii 书有几个错别字，但没有那么严重，而且太新，所以没有报告勘误表（已经检查过）。
这是源代码中的数据库模式：
-- Disable foreign keys
SET FOREIGN_KEY_CHECKS = 0 ;
-- Create tables section -------------------------------------------------
-- Table tbl_project
CREATE TABLE IF NOT EXISTS `tbl_project` (
`id` INTEGER NOT NULL auto_increment,
`name` varchar(128) NOT NULL,
`description` text NOT NULL,
`create_time` DATETIME default NULL,
`create_user_id` INTEGER default NULL,
`update_time` DATETIME default NULL,
`update_user_id` INTEGER default NULL,
PRIMARY KEY (`id`)
) ENGINE = InnoDB
;
-- DROP TABLE IF EXISTS `tbl_issue` ;
CREATE TABLE IF NOT EXISTS `tbl_issue`
(
`id` INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
`name` varchar(256) NOT NULL,
`description` varchar(2000),
`project_id` INTEGER,
`type_id` INTEGER,
`status_id` INTEGER,
`owner_id` INTEGER,
`requester_id` INTEGER,
`create_time` DATETIME,
`create_user_id` INTEGER,
`update_time` DATETIME,
`update_user_id` INTEGER
) ENGINE = InnoDB
;
-- DROP TABLE IF EXISTS `tbl_user` ;
-- Table User
CREATE TABLE IF NOT EXISTS `tbl_user`
(
`id` INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
`email` Varchar(256) NOT NULL,
`username` Varchar(256),
`password` Varchar(256),
`last_login_time` Datetime,
`create_time` DATETIME,
`create_user_id` INTEGER,
`update_time` DATETIME,
`update_user_id` INTEGER
) ENGINE = InnoDB
;
-- DROP TABLE IF EXISTS `tbl_project_user_assignment` ;
-- Table User
CREATE TABLE IF NOT EXISTS `tbl_project_user_assignment`
(
`project_id` Int(11) NOT NULL,
`user_id` Int(11) NOT NULL,
`create_time` DATETIME,
`create_user_id` INTEGER,
`update_time` DATETIME,
`update_user_id` INTEGER,
PRIMARY KEY (`project_id`,`user_id`)
) ENGINE = InnoDB
;
-- The Relationships
ALTER TABLE `tbl_issue` ADD CONSTRAINT `FK_issue_project` FOREIGN KEY (`project_id`) REFERENCES `tbl_project` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE `tbl_issue` ADD CONSTRAINT `FK_issue_owner` FOREIGN KEY (`owner_id`) REFERENCES `tbl_user` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE `tbl_issue` ADD CONSTRAINT `FK_issue_requester` FOREIGN KEY (`requester_id`) REFERENCES `tbl_user` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE `tbl_project_user_assignment` ADD CONSTRAINT `FK_project_user` FOREIGN KEY (`project_id`) REFERENCES `tbl_project` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE `tbl_project_user_assignment` ADD CONSTRAINT `FK_user_project` FOREIGN KEY (`user_id`) REFERENCES `tbl_user` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
-- Insert some seed data so we can just begin using the database
INSERT INTO `tbl_user`
(`email`, `username`, `password`)
VALUES
('test1@notanaddress.com','Test_User_One', MD5('test1')),
('test2@notanaddress.com','Test_User_Two', MD5('test2'))
;
-- Enable foreign keys
SET FOREIGN_KEY_CHECKS = 1 ;
无论如何，提前谢谢！
编辑：澄清该项目确实存在^^。
mysql> 从 tbl_project 中选择 id、name；
+----+-------------------+
| 编号 | 姓名 |
+----+-------------------+
| 6 | 项目 1 |
| 1 | 项目僵尸 1 |
+----+-------------------+
2 行（0.00 秒）