数据库程序的作业，，简单了一些，，有些功能未实现，，做了两份作业，一份自己的，一份同学的，，呵呵，，功能一样，，界面不同-database operations, and some simple, some functions had not been achieved, and do two operations, one on their own. a classmate, and huh, and functions, and different interface. .