MySQL外键 - 创建表时出现错误150

我写了一些SQL代码来创建具有几个关系（外键）的五个表。MySQL外键 - 创建表时出现错误150

第一个外键关系工作正常，在没有任何错误创建的表，但是当我尝试创建gasten_url_toegangscodes我得到以下错误：

#1005 - Can't create table 'dbname.gasten_url_toegangscodes' (errno: 150).

我读过有关外键的文档和我仍然无法找到问题..最奇怪的是，它可以在前三张表中使用。

任何人都可以帮助我吗？

我的完整的SQL代码是：提前

CREATE TABLE IF NOT EXISTS `groepen` (
    `id` tinyint(3) NOT NULL AUTO_INCREMENT, 
    `naam` varchar(50) NOT NULL DEFAULT '', 
    `status` tinyint(1) NOT NULL DEFAULT '1', 
    PRIMARY KEY (`id`) 
) ENGINE=InnoDB; 

CREATE TABLE IF NOT EXISTS `gasten` (
    `id` int(5) NOT NULL AUTO_INCREMENT, 
    `bedrijf` varchar(100) NOT NULL DEFAULT '', 
    `uniek` varchar(64) NOT NULL, 
    `groepid` tinyint(3) NOT NULL, 
    PRIMARY KEY (`id`), 
    FOREIGN KEY (groepid) REFERENCES `groepen` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION 
) ENGINE=InnoDB; 

CREATE TABLE IF NOT EXISTS `passen` (
    `id` tinyint(3) NOT NULL AUTO_INCREMENT, 
    `naam` varchar(30) NOT NULL DEFAULT '', 
    `color` varchar(7) NOT NULL DEFAULT '#FFFFFF', 
    `bekend` tinyint(1) NOT NULL DEFAULT '0', 
    `welkom` tinyint(1) NOT NULL DEFAULT '0', 
    `aantal` tinyint(1) NOT NULL DEFAULT '0', 
    `nummer` int(11) NOT NULL DEFAULT '0', 
    `begrens` tinyint(1) NOT NULL DEFAULT '0', 
    `status` tinyint(1) NOT NULL DEFAULT '1', 
    `priority` int(11) NOT NULL DEFAULT '0', 
    PRIMARY KEY (`id`), 
    KEY `naam` (`naam`) 
) ENGINE=InnoDB; 

CREATE TABLE IF NOT EXISTS `gasten_url_toegangscodes` (
    `uniek` varchar(64) NOT NULL, 
    `unieke_url_code` char(64) NOT NULL, 
    `salt` char(16) NOT NULL, 
    FOREIGN KEY (uniek) REFERENCES `gasten` (`uniek`) ON DELETE CASCADE ON UPDATE NO ACTION 
) ENGINE=InnoDB DEFAULT CHARSET=latin1; 

CREATE TABLE IF NOT EXISTS `gasten_tickets` (
    `id` int(11) NOT NULL AUTO_INCREMENT, 
    `pas_id` tinyint(3) NOT NULL, 
    `uniek` varchar(64) NOT NULL, 
    `barcode` char(16) NOT NULL, 
    `secret_key` char(32) NOT NULL, 
    `download_count` int(11) NOT NULL DEFAULT '0', 
    `last_download_time` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', 
    `scanned` enum('N','Y') NOT NULL, 
    `scanned_datetime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', 
    PRIMARY KEY (`id`), 
    FOREIGN KEY (uniek) REFERENCES `gasten` (`uniek`) ON DELETE CASCADE ON UPDATE NO ACTION, 
    FOREIGN KEY (pas_id) REFERENCES `passen` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION 
) ENGINE=InnoDB;

谢谢！

来源

2012-03-10 Ivo van Beek

如果你创建'gasten.uniek'指数是否行得通？ 'INDEX idx_uniek（uniek）' – 2012-03-10 14:13:44

另一个不同是'gasten_url_toegangscodes'上的默认字符集' – 2012-03-10 14:15:17

谢谢，这个工程！一直在寻找几个小时！再次感谢！ – 2012-03-10 14:39:11

上gasten.uniek

CREATE TABLE IF NOT EXISTS `gasten` (
    `id` int(5) NOT NULL AUTO_INCREMENT, 
    `bedrijf` varchar(100) NOT NULL DEFAULT '', 
    `uniek` varchar(64) NOT NULL, 
    `groepid` tinyint(3) NOT NULL, 
    PRIMARY KEY (`id`), 
    INDEX `idx_uniek` (`uniek`), 
    FOREIGN KEY (groepid) REFERENCES `groepen` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION 
) ENGINE=InnoDB;

创建索引，并设置FK的字符集在gasten_url_toegangscodes一样在gasten相关列。

假设gasten是UTF-8：

CREATE TABLE IF NOT EXISTS `gasten_url_toegangscodes` (
    /* use same charset for this column */ 
    `uniek` varchar(64) NOT NULL CHARSET UTF-8, 
    `unieke_url_code` char(64) NOT NULL, 
    `salt` char(16) NOT NULL, 
    FOREIGN KEY (uniek) REFERENCES `gasten` (`uniek`) ON DELETE CASCADE ON UPDATE NO ACTION 
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

来源

2012-03-10 14:40:18

MySQL外键 - 创建表时出现错误150

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