图书租赁系统的设计方案

（1）　　查询客户信息。负责客户的信息的查询。

（2）　　查询员工信息。负责公司员工信息的查询。

（3）　　查询书籍信息。负责书籍信息的查询。

（4）　　查询客户记录。负责查询客户的书籍租赁历史记录。

-Book rental system design (1) query customer information. Responsible for customer information inquiries. (2) query employee information. Employees responsible for information inquiries. (3) query book information. Responsible for books of information inquiries. (4) customer records inquiries. Responsible for customer inquiries, book rental history.