摘要
本文提出了在演绎数据库系统研究中的一种新的关系叫虚—实关系．虚—实关系集成了实关系与虚关系的一些优点，克服了它们的一些缺点，在演绎数据库系统中它具有特别的性质．将虚—实关系引入演绎数据库系统后我们可以扩大演绎数据库系统的功能．目前，虚—实关系已在ＳＵＮ—３工作站上的演绎数据库系统ＵＮＩＦＹ中实现并正在用于ＣＡＤ图形领域中．
In this paper, a new relation called virtual-real relation in research of deductive database system has been proposed, virtual-real relation can integrate some advantage of real relation and virtual relation, overcome some disadvantage of them, it has a special character in DDBS. After introducing virtual-real relation to DDBS the authors can extend the function of DDBS. Now a virtual-real relation has been realized in DDBS -dUNIFY on SUN-3 workstation and is being applied to CAD and graphic fields.
出处
《软件学报》
EI
CSCD
北大核心
1994年第12期17-23,共7页
Journal of Software
