说明：  将常用的数据库(SQL2005.Access)联接方法，功能处理，如数据连接，数据库操作insert,delete,update。数据库备份，还原等功能。避免代码的重写。
(The common database (SQL2005.Access) connection method, function processing, such as data connections, database operations insert, delete, update. Database backup, restore, and so on. To avoid rewriting the code.)