Aim at special application , this article brings out some data models based on nonstructured engineering data model and use the theory in engineering data model research area for reference , combines the data modeling technology with the object oriented technology , uses the object oriented technology to abstract objects for the application system and abstract the application frame , converts the polymorphism character of the object oriented frame to the complex data storage character , realizes the permanent management of object method hi the object oriented system , and then from the position of data independence , separates the method independent management from the object frame and achieves the polymorphism and extensibility of the object oriented system , fulfills the enterprise application who need customize the software function 本文在非结构化工程数据模型的基础上,吸取非结构化工程数据模型的研究成果,提出针对专门应用的复杂数据模型,并将数据库建模技术与面向对象技术相结合,按照面向对象的方法对工程应用进行分析建模,抽取出系统的对象框架结构,将面向对象系统的实现方法作为复杂数据模型处理,实现对象方法的持久化管理,从而在数据独立性的角度将对象方法从对象框架分离出来单独管理,在更高的层次上实现了面向对象系统的多态性和可扩展性,满足了企业复杂应用中对软件系统进行柔性定制的要求。课题研究的问题为面向对象系统中对象方法的持久化存储与管理。
Data independence is the type of data transparency that matters for a centralized DBMS. It refers to the immunity of user applications to make changes in the definition and organization of data.