本系统主要完成访客资料的记录和查询，为此，系统必须能够维护一个记录访客详细资料的数据表，对该表进行写入和读出数据的操作。与此同时，本系统还能维护用户权限，这样系统必须维护用户资料数据表，管理用户ID、密码和用户权限类型。系统还要能够记录和查询用户的每一个操作，就应该再维护一个记录用户操作的数据表，记录用户ID、所进行的操作类型，以及该操作的具体时间等。-This system is mainly to complete the record of visitor information and inquiries, to this end, the system must be able to maintain a record of visitors detailed information on the data table, the table and读出数据write operation. At the same time, this system can also maintain user permissions, so the need to preserve the user information system data tables, manage user ID, password and user permissions type. System should be able to record and query the user for each operation, it should no longer maintain a record of user