摘要
介绍了自行研制和开发的面向对象的工程数据库管理系统（ＨＺＥＤＢ）的建模语言的设计思想和基本文法，并讨论了它对产品数据交换国际标准ＳＴＥＰ的建模语言ＥＸＰＲＥＳＳ的支持与ＥＸＰＲＥＳＳ核心规则间映射关系，给出了采用面向对象方法实现ＨＺＥＤＢ建模子系统的总体框架，支持信息的封装，对象继承和复杂对象等ｏｏ特征的数据字典结构以及继承和封装的实现方法．
HZEDB is an object-oriented engineering database rnanaging systern developed by theauthors. This paper is concerned with the design idea and the syntax of its tnodelling lan-guage. Its support to the modelling language EXPRESS in the STEP,an internationalstandard for product data representation and the mapping betwecn the key rules of EX-PRESS are analyzed and the overall architecture of the HZEDB modelling subsybtem imple-mented with tlie object-oriented method is given. The structure of the data dictionarv withobject model orientation is analyzed.It will stipport the generalization of complex objects andtheir relation and the object idcntifier is independent of the object valld. Themeehanism of the inheritance of the object and the enepasulation of the infomiation are discussed.
出处
《华中理工大学学报》
CSCD
北大核心
1995年第5期5-10,共6页
Journal of Huazhong University of Science and Technology
基金
863高科技资助项目
