实现图书的借出和收回，学生借出数量和库存数量同时发生变化，实现学生图书借阅情况的查询。实现图书信息的相关查询。

另外设计应有借阅时间、借阅期限、归还日期，每人最多可借数量等功能

-To achieve the lending of books and back, student lent number and the number of inventory changes at the same time, students borrow books in the query. Book information related queries. Another design should borrow time the loan period, the return date, each person can borrow up to the function of the quantity of