从一个错误语句看Mysql 数据库命名规范
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 ".$this->dbname."
这是列出数据表信息的mysql查询语句，变量".$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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