一个小型的图书管理系统,用到了access数据库,其中有三种权限的用户登陆这个系统,每种用户将拥有不同的权限,用户密码和帐户打开程序中的access便可知道.-A small library management system, use the access database, of which there are three users landing the system, each user will have different permissions, the user passwor