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从一个错误语句看Mysql 数据库命名规范

Jun 07, 2016 pm 05:23 PM
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在整理WBlog的数据库备份模块时,在后台无法列出数据库的表信息,于是检查问题,对数据库备份模块的代码逐行检查,生怕错漏了哪个地方。一遍,两遍。。。够折腾的了。最后发现,错误的原因竟是数据库的命名不规范!


看下面的mysql语句

SHOW TABLE STATUS FROM ".$this->dbname."
Copy after login

这是列出数据表信息的mysql查询语句,变量".$this->dbname."是数据库的名称。我在本地数据库名称是wblog3.12,因为数据库名称是不能带上"."字符的,所以上面的语句返回的值为null。


     从上面的错误例子可以知道,Mysql 数据库的命名是需要遵循一定的规范的。那么命名范是怎样的呢?

     Mysql 数据库命名涉及的字符规范,采用26 个英文字母(区分大小写)和0-9 这十个自然数,加上下划线'_'组成,共63 个字符,不能出现其他字符(注释除外),并且命名的长度不得超过30 个字符的系统限制。



  


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