The recommended approach is to separate the data access logic from the presentation layer. 建议的方法是将数据访问逻辑与表示层分离。
They do format the screen and accept keystrokes,but they can't handle other aspects of presentation logic,such as screen sequencing and data validation. 它们的确编排了屏幕显示格式,并接收敲键输入,但它们不能处理表示层其它的逻辑操作,如屏幕显示时序排列和数据验证等。