各种基本数据的录入，修改，删除，查询，统计计算。对于系统的简单操作，如：改 变用户的密码、增加和删除用户、设置数据文件的路径等等。-All kinds of basic data entry, edit, and delete, inquiry, statistics calculation. For the system is easy to operate, such as: change the password of user, add and remove users set d