我们所要建立的系统主体思想是建立两个类，一个建立用户对象，另一个用来建立图书对象，图书的建立都是建立在用户对象基础上的，也就是说，建立用户对象后才能建立图书对象，一个用户对应多个图书对象，通过方法对图书信息实现查询、删除、插入等一些基本操作。在此过程中我们实现了数据库的连接，将数据库中的信息导入到图书对象数组中并保存，反过来将图书对象的信息插入到数据库中，将数据库中的数据转化成电子表格的形式，实现了数据的导出-We will establish a system main idea is to build two class, a user object, another is used to establish the library, books are established based on the user object basis, that is to say, the establishment of user object to establish library object, a user corresponding to a plurality of the object, to achieve query, delete, insert some basic operations on the books information by. In this process, we achieve the database connection, the array database information into the book the objects and save, in turn will book object information into the database, the database data into electronic form, the data is derived