集成化公路CAD系统工程数据库的研究

从公路设计中的数据需求和流程出发,阐述了工程数据库的特性,规划了公路工程数据库的总体结构,重点对关系数据模型进行了扩展研究,构造了关系-面向对象模型作为工程数据库的数据模型,并以客户/服务器体系结构作为工程数据库的体系结构。在此基础上,针对公路设计过程中数据操作的特殊需要,构造了标准数据查询类、平面工程类。通过对类的封装,实现了数据库功能的有效扩充,从而实现了具有实时查询、实时修改、实时存储以及支持分布式设计功能的公路工程库和公路标准库。

The research of engineering database in integrated CAD system of highway

Based on the analysis of the data requirements and data following in the highway design, this paper discusies the character of engineering database and plans the architecture structure of highway engineering database. This paper emphasizes on the expanding research of Relational Data Model. Further rrtore, it constructs the relationship - OOP model as the data model of engineering database. Based on those theories and the special requests of data manipulation in highway design process, this paper has constructed the standard data query classes, plane engineering classes etc. And by enclosing these classes, the functions of database are expanded effectively and the highway engineering database and highway standard database With the functions of real - time query, real - time modification, real - time storage and supporting distributing design has been constructed.