图书馆管理数据库设计。如果输入的用户名和密

码正确，则可以进入主窗口。主窗口是MainFrame 类的实例。从这里可以按不

同的按钮进入图书入库（IntoDB 类）、图书查询（SearchFrame 类）、借书

（BorrowFrame 类）、还书（ReturnFrame 类）和借书证管理（ManageFrame 类）。

另外还有一个辅助的FormSQL 类提供一个生产SQL 语句的方法。这些子窗口点

击关闭按钮之后都会回到主窗口，实现多窗口模式。如果在登录的时候输入guest

账号和密码，则可以进入查询界面，查询完毕之后回到登录界面。

-If you enter a user name and password are correct, you can enter the main window. The main window is the MainFrame class. From here you can press the button to enter the books of different storage (IntoDB class), book check (SearchFrame class), library (BorrowFrame class), but the book (ReturnFrame class) and the library card management (ManageFrame class). There is also an auxiliary FormSQL class provides a method for the production SQL statement. These sub-window click the Close button will return to the main window, multi-window mode. If the guest account login and password when the input, you can enter the query interface, the query has finished back to the login screen.