【摘要】 根据面向对象的分层应用程序,特别是访问关系数据库的应用程序中,各层对象的通信代价和类的重用与可维护性问题,总结了三种类结构模式,并对它们的应用进行了评述。更多还原

【Abstract】 According to the problem of communication among objects at different levels,and the problems of reusibility and maintainability of class in the multitiers ObjectOriented applicatoion,especially in the application accessing relational databases,three architecture patterns are given and commentted for their applications.更多还原