简单的连接数据库源码，最近有很多朋友一直说不会连接MySQL数据库，这里我就发一个我写的源码，很简单，不要笑我，呵呵。-Simply connect to the database source code, many of my friends have been saying recently, will not connect MySQL database, where I made the source code I wrote a very simple, do not laugh at me, huh, huh.