Home Database Mysql Tutorial MYSQL ERRNO:#1005

MYSQL ERRNO:#1005

Jun 07, 2016 pm 03:46 PM
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#1005 - Can't create table './my_news_release_system/user.frm' (errno: 150) MySQL Error Number 1005 Cant create table XX.frm (errno: 150) 默认分类 2010-04-28 16:04:41 阅读 364 评论 0 字号:大中小 订阅 烦了我一下午 终于解决了 在这里分享下

#1005 - Can't create table './my_news_release_system/user.frm' (errno: 150)

 

MySQL Error Number 1005 Can’t create table ‘XX.frm’ (errno: 150)

默认分类 2010-04-28 16:04:41 阅读364 评论0   字号:大中小订阅

烦了我一下午  终于解决了  在这里分享下  一篇彻底解析这个错误的文章。

当你试图在mysql中创建一个外键的时候,这个出错会经常发生,这是非常令人沮丧的。像这种不能创建一个.frm 文件的报错好像暗示着操作系统的文件的权限错误或者其它原因,但实际上,这些都不是的,事实上,这个mysql报错已经被报告是一个mysql本身的bug并出现在mysql 开发者列表当中很多年了,然而这似乎又是一种误导。

 

在很多实例中,这种错误的发生都是因为mysql一直以来都不能很好的支持的关系的问题,更不幸的是它也并没有指明到底是哪一个问题会导致上面那种错误,下面我把导致这个可怕150错误的常见原因列出来了,并且我以可能性的大小作了排序

 

已知的原因:

 

1两个字段的类型或者大小不严格匹配,例如,如果一个是INT(10), 那么外键也必须设置成INT(10), 而不是 INT(11) 也不能是 TINYINT. 你得使用 SHOW 命令来查看字段的大小,因为一些查询浏览器有时候把 int(10) int(11) 都显示为integer。另外,你还必须确定两个字段是否一个为 SIGNED,而另一个又是UNSIGNED, 这两字段必须严格地一致匹配,更多关于signed unsigned 的信息,请参阅:http://www.verysimple.com/blog/?p=57

 

2你试图引用的其中一个外键没有建立起索引,或者不是一个primary key , 如果其中一个不是primary key 的放,你必须为它创建一个索引。

 

3外键的名字是一个已经存在的一个键值了,这个时候,你应该检查你的数据库以确保外健名字是唯一的,或者你在键名后面加上几个随机的字符以测试是否是这个原因。

 

4其中一个或者两个表是MyISAM引擎的表,若想要使用外键约束,必须是InnoDB引擎,(实际上,如果两个表都是MyISAM 引擎的,这个错误根本不会发生,但也不会产生外键),你可以通过查询浏览器来设置表的引擎类型

 

5你可能设置了ON DELETE SET NULL, 但是相关的键的字段又设置成了NOTS NULL 值。你可能通过修改cascade 的属性值或者把字段属性设置成 allow null 来搞定这个bug.

 

6请确定你的Charset Collate 选项在表级和字段级上的一致

 

7你可能设置为外键设置了一个默认值,如 default=0

 

8在这个关系里面,其中的一个字段是一个混合键值中的一个,它没有自己独立的索引,这时,你必须为它创建一个独立的索引。

 

9 ALTER 声明中有语法错误

我的错误,SQLMYSQL语法差别

SQL: CONSTRAINT a_b FOREIGN KEY(b_key) REFERENCES b

MYSQL:CONSTRAINT a_b FOREIGN KEY(b_key) REFERENCES b(b_key)

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