涵洞工程数据库数据模型的研究

Study on Data Model of Culvert Database

从涵洞设计工作的流程出发,对设计数据进行了分析、归类和数据结构的描述,提出了涵洞工程数据库中不同数据结构所采用的关系数据模型和对象-关系数据模型,并在此基础上构建了含有语义库、工作库、部件库和结果库等4个子数据库的涵洞工程数据库,并进行了数据库逻辑模型设计,通过数据聚集、函数封装和继承,实现了对数据类型的扩充和复杂对象的描述,从而证实了关系数据模型和对象-关系数据模型是构建涵洞工程数据库较理想的数据模型。

According to the action and feature of culvert database,and through th e analyzing and classifying of design data and the describing of data structure beginning from the work flow of culvert design,a relational data model and objec t-relation data model was used by different data structure in culvert engineerin g database. Based on above,four culvert engineering databases of sub-database we re built,such as semantics database,work database,components database and result database. At the same time,the logic model design of database was put forward,a nd the extension of data type and the describing of complex object was achieved. As being proved,it is relational data model and object-relation data model that are the proper data models.