主要是对图书馆的图书进行管理(录入、修改、删除、借阅)，其中前三个由管理员进行操作，后一个通过管理员实现用户对图书的借阅。-Mainly books for the library management (input, modify, delete, loan), which operates the first three by the administrator, the latter achieved through the administrator users to borrow books.