构建面向对象时态数据模型的研究  

Constructing a Temporal Object-Oriented Data Model

作　　者：任淑霞[1] 方思行[1] 

机构地区：[1]暨南大学计算机系,广州510632

出　　处：《现代计算机》2002年第7期11-14,共4页Modern Computer

摘　　要：本文通过对现存关系数据库和面向对象数据库的比较分析,总结其优点与不足,并在结合了二者优点的UniSQL/X模型基础上,对该模型进行时态上的扩展,使它能够记录和处理时态信息。在查询代数中,引入了一些特殊的时态操作,通过聚集、概括和时间参考三种关联对对象进行访问,而且此代数同时反映了时态关系代数和对象代数的特点。The advantages and disadvantages ofRDB and OODB have been received by analyzing and comparing between them.UniSQL/X model,the unified model of RDB and OODB,was expended to incorporate the time dimension so that it can record and deal with information on time.In query algebra,there has been some special temporal operations which can access objects by three associations:aggregation,generalization,time-reference,and the algebra reflects the spirit of both temporal relational algebra and object algebra.

关 键 词：面对对象 时态数据模型 关系数据库 查询代数 

分 类 号：TP311.52[自动化与计算机技术—计算机软件与理论]