图书管理系统样板，案例，初学者参考。用VB和access做的。Public sys_loginsucceeded As Boolean '用户登录标志 Public sys_userid As String '用户id Public sys_borrowlimit As Integer '结束时限 Public sys_continuelimit As Integer '续借时限 Public sys_maxborrow As Integer '最大借书量 Public sys_maxpenalty As Double