1
的想法很簡單:我有三個(或多個)表MySQL的外鍵到另一個外鍵
- master_tbl (id, something, somethingelse)
- tbl2 (id, ....)
- tbl3 (id, ....)
現在,我要的是一個外鍵關係,如tbl3.id將指向TBL2 .id和tbl2.id會指向master_tbl.id - 所有外鍵都是ON UPDATE CASCADE
和ON DELETE CASCADE
。我從中得到的是,當我從tbl2中刪除一條記錄時,它的tbl3等價物也會被擦除,但不是master_tbl。當我從master_tbl中刪除記錄時,所有三個表都被擦除。
當我嘗試在tbl3.id-> tbl2.id上創建外鍵時,出現mysql錯誤150 - 無法創建表(已創建tbl2.id-> master_tbl.id)。我的MySQL版本是5.1.46
。任何想法,爲什麼這可能是?
編輯:表定義 smf_members又名master_table
-- Table "smf_members" DDL
CREATE TABLE `smf_members` (
`id_member` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
`member_name` varchar(80) NOT NULL DEFAULT '',
`date_registered` int(10) unsigned NOT NULL DEFAULT '0',
`posts` mediumint(8) unsigned NOT NULL DEFAULT '0',
`id_group` smallint(5) unsigned NOT NULL DEFAULT '0',
`lngfile` varchar(255) NOT NULL DEFAULT '',
`last_login` int(10) unsigned NOT NULL DEFAULT '0',
`real_name` varchar(255) NOT NULL DEFAULT '',
`instant_messages` smallint(5) NOT NULL DEFAULT '0',
`unread_messages` smallint(5) NOT NULL DEFAULT '0',
`new_pm` tinyint(3) unsigned NOT NULL DEFAULT '0',
`buddy_list` text NOT NULL,
`pm_ignore_list` varchar(255) NOT NULL DEFAULT '',
`pm_prefs` mediumint(8) NOT NULL DEFAULT '0',
`mod_prefs` varchar(20) NOT NULL DEFAULT '',
`message_labels` text NOT NULL,
`passwd` varchar(64) NOT NULL DEFAULT '',
`openid_uri` text NOT NULL,
`email_address` varchar(255) NOT NULL DEFAULT '',
`personal_text` varchar(255) NOT NULL DEFAULT '',
`gender` tinyint(4) unsigned NOT NULL DEFAULT '0',
`birthdate` date NOT NULL DEFAULT '0001-01-01',
`website_title` varchar(255) NOT NULL DEFAULT '',
`website_url` varchar(255) NOT NULL DEFAULT '',
`location` varchar(255) NOT NULL DEFAULT '',
`icq` varchar(255) NOT NULL DEFAULT '',
`aim` varchar(255) NOT NULL DEFAULT '',
`yim` varchar(32) NOT NULL DEFAULT '',
`msn` varchar(255) NOT NULL DEFAULT '',
`hide_email` tinyint(4) NOT NULL DEFAULT '0',
`show_online` tinyint(4) NOT NULL DEFAULT '1',
`time_format` varchar(80) NOT NULL DEFAULT '',
`signature` text NOT NULL,
`time_offset` float NOT NULL DEFAULT '0',
`avatar` varchar(255) NOT NULL DEFAULT '',
`pm_email_notify` tinyint(4) NOT NULL DEFAULT '0',
`karma_bad` smallint(5) unsigned NOT NULL DEFAULT '0',
`karma_good` smallint(5) unsigned NOT NULL DEFAULT '0',
`usertitle` varchar(255) NOT NULL DEFAULT '',
`notify_announcements` tinyint(4) NOT NULL DEFAULT '1',
`notify_regularity` tinyint(4) NOT NULL DEFAULT '1',
`notify_send_body` tinyint(4) NOT NULL DEFAULT '0',
`notify_types` tinyint(4) NOT NULL DEFAULT '2',
`member_ip` varchar(255) NOT NULL DEFAULT '',
`member_ip2` varchar(255) NOT NULL DEFAULT '',
`secret_question` varchar(255) NOT NULL DEFAULT '',
`secret_answer` varchar(64) NOT NULL DEFAULT '',
`id_theme` tinyint(4) unsigned NOT NULL DEFAULT '0',
`is_activated` tinyint(3) unsigned NOT NULL DEFAULT '1',
`validation_code` varchar(10) NOT NULL DEFAULT '',
`id_msg_last_visit` int(10) unsigned NOT NULL DEFAULT '0',
`additional_groups` varchar(255) NOT NULL DEFAULT '',
`smiley_set` varchar(48) NOT NULL DEFAULT '',
`id_post_group` smallint(5) unsigned NOT NULL DEFAULT '0',
`total_time_logged_in` int(10) unsigned NOT NULL DEFAULT '0',
`password_salt` varchar(255) NOT NULL DEFAULT '',
`ignore_boards` text NOT NULL,
`warning` tinyint(4) NOT NULL DEFAULT '0',
`passwd_flood` varchar(12) NOT NULL DEFAULT '',
`pm_receive_from` tinyint(4) unsigned NOT NULL DEFAULT '1',
PRIMARY KEY (`id_member`),
KEY `member_name` (`member_name`),
KEY `real_name` (`real_name`),
KEY `date_registered` (`date_registered`),
KEY `id_group` (`id_group`),
KEY `birthdate` (`birthdate`),
KEY `posts` (`posts`),
KEY `last_login` (`last_login`),
KEY `lngfile` (`lngfile`(30)),
KEY `id_post_group` (`id_post_group`),
KEY `warning` (`warning`),
KEY `total_time_logged_in` (`total_time_logged_in`),
KEY `id_theme` (`id_theme`)
) ENGINE=InnoDB AUTO_INCREMENT=73 DEFAULT CHARSET=utf8;
cyp_users又名tbl2的
-- Table "cyp_users" DDL
CREATE TABLE `cyp_users` (
`id` mediumint(8) unsigned NOT NULL,
`role` varchar(255) NOT NULL DEFAULT 'unregistered',
PRIMARY KEY (`id`),
CONSTRAINT `cyp_users_ibfk_1` FOREIGN KEY (`id`) REFERENCES `smf_members` (`id_member`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
cyp_vip_users又名TBL3
-- Table "cyp_vip_users" DDL
CREATE TABLE `cyp_vip_users` (
`id` mediumint(8) NOT NULL,
`od` date NOT NULL,
`do` date NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
請發表您使用的腳本。你所要做的是*任何*數據庫服務器的核心要求。該錯誤必須在腳本中。 – 2010-10-26 10:02:39
我試圖通過Navicat MySQL客戶端來做到這一點,但我至少會發布表定義。 – cypher 2010-10-26 10:03:37
從tbl3到tbl2沒有外鍵。我假設你忘了發佈該部分。 – 2010-10-26 10:10:03