图书管理系统，功能和需求：

1）管理员：管理图书，职员，读者，查询图书，借书服务，还书服务，管理个人信息

2）普通职员：管理图书，查询图书，借书服务，还书服务，管理个人信息

3）读者：查询图书，查询借阅信息，借书，还书，管理个人信息

-Library management system, functions and requirements: 1) Manager: management books, staff, readers, query books, library services, book services, management of personal information 2) the general staff: management books, inquiries, books, library services, but also book services, management of personal information 3) readers: Query books, inquiries, loan information, library, book, manage personal information