小型CAD数据库的一种实现方案

Scheme for Realizing Datahase in Small CAD System

针对传统关系数据库不能直接支持工程设计对象表示的弱点,结合小型CAD系统环境,提出了一种基于关系模型概念扩充的CAD数据库模式,并给出了按该模式进行设计对象数据结构与关系文件转换的算法及对库中对象简单操作的流程。

To overcome the shortcoming of the conventional relational database which cannot give a direct modeling to engineering designing object, this paper proposes a schema based on the extended concept of relational model for realizing CAD database in small CAD system. An algorithm is given under the schema for transformation between network data structure and relational files. Also presented are a few simple operation flowcharts.