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我在做敏捷Yii書。嘗試INSERT時MySQL和外鍵衝突
無論如何，我想執行這個命令：
INSERT INTO tbl_project_user_assignment (project_id, user_id) values ('1','1'), ('1','2');
而且我得到這個錯誤：
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，讓我們看看如果tbl_project表已經PROJECT_ID = 1。做了一個快速的SELECT * FROM tbl_project;並且項目存在。好吧，我們來檢查用戶，SELECT * FROM tbl_user; Yup 2用戶，ID爲1和2.
我在做什麼錯？有錯字嗎？敏捷yii書有幾個拼寫錯誤，但它們並不嚴重，而且太新，所以沒有報告勘誤（已經檢查過）。
這裏的數據庫模式從源代碼：
-- 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
('[email protected]','Test_User_One', MD5('test1')),
('[email protected]','Test_User_Two', MD5('test2'))
;
-- Enable foreign keys
SET FOREIGN_KEY_CHECKS = 1 ;
無論如何，在此先感謝！
編輯： 說明該項目確實存在^^。
mysql> select id，name from tbl_project;
+ ---- + ------------------- +
| id |名稱|
+ ---- + ------------------- +
| 6 |項目1 |
| 1 |項目殭屍1 |
+ ---- + ------------------- +
2組行（0.00秒）
爲什麼PROJECT_ID和USER_ID在tbl_project_user_assignment int類型（11 ）而不是INTEGER？我傾向於認爲INTEGER是4 BYTES，INT（11）會去8個BYTES。這可能有一些影響，可能不會。 – MikeAinOz 2010-08-25 23:22:50
@MikeAinOz 謝謝！你修好了。這是問題所在。呃，我猜我會提交勘誤表。 – mythicalprogrammer 2010-08-25 23:30:08