图书管理系统的用户是学校图书馆，主要包括管理图书的库存信息、每一本书的借阅信息以及每一个人的借书信息。每一种图书的库存信息包括书名、作者、金额等。每一本被借阅的书都包括如下信息：书名、金额等。每一个人的借书信息包括姓名、性别、学号。(The user of library management system is the school library, which mainly includes managing book inventory information, borrowing information of every book and borrowing information of everyone. The inventory information of each kind of books includes the name of the book, the author, the amount and so on. Every book to be borrowed includes the following information: the name of the book, the amount, and so on. Each person's book information includes name, sex, and school number.)