面向对象数据库中的等价模式演化策略

A Method of Equivalent Schema Evolution in an Object-oriented Database

面向对象数据库中因为模式演化而导致的软件遗产问题是当今ＯＯＤＢ的一个重要研究课题．该文提出了一种基于路径无关语言的等价演化策略，讨论了等价模式演化的充要条件与具体的实现算法．与传统的模式演化方法相比，该策略较好地解决了模式演化中的软件重用问题．

Software legacv problem caused by schema evolution in an object-oriented database is a very important research issue. This paper proposes a concept and related algorithms of equivalent schema evolution based on a path-independence (PI) language. Compared with traditional approaches, the method resolves software rouse problem in schema evolution.