图书信息管理系统应该具备图书的信息管理功能和流通管理功能。其中，信息管理功能包括查找，增加，修改，删除，显示全部信息等模块。流通管理功能包括图书借阅，归还等模块。因此分别设计各个模块，实现不同的功能。(The library information management system should have the information management function and the circulation management function of the books. Among them, information management functions include searching, adding, modifying, deleting, displaying all the information and other modules. The function of circulation management includes the module of borrowing and returning books and so on. Therefore, each module is designed to achieve different functions.)