一个改个的mysql类.以前网上提供的一些都是针对旧版的mysql,现在mysql 4.0,5.0以上的,部分接口已经不能用了.修改了部分接口-A change of the mysql category. Previously available online some are directed at an older version of mysql, now more than mysql 4.0,5.0, some interfaces can not be used. Modify s