【摘要】 针对面向对象数据库中视图的特点 ,提出了一个延迟视图维护的模型以及相关的更新算法 .在视图更新时 ,要考虑导出它的类的改动 ,以及以此类为根的继承和类组成子层次结构中的所有类的改动 .因此 ,为每个类添加一个修改列表 ,为依赖于它的视图保存修改信息更多还原

【Abstract】 According to the charactors of object oriented views, we present a model for deferred view maintenance and develop a series of related updating algorithms. A view is updated by considering modifications performed within all classes along the inheritance and class composition subhierarchies rooted at every class used in deriving that view. To each class, we add a modification list to keep one modification tuple per view dependent on that class.更多还原