这个程序主要作用是从数据库中读取相关的学生信息，运用了cursor的fetch，由于返回结果很多，一个屏幕显示不了，需要添加翻页功能，既按F7和F8可以实现前翻和后翻的效果。-Major role in this process is read from the database related to student information, use the cursor to fetch, returns the result as much of a screen display can not, need to add page function, both can be achieved by F7 and F8 before the turn and after the turn of the effect.