主动的面向对象数据库管理系统中的事件和规则的设计  

DESIGN OF EVENTS AND RULES IN AN ACTIVE OBJECT ORIENTED DATABASE MANAGEMENT SYSTEM

作　　者：竺卫东[1] 何志均[1] 

机构地区：[1]浙江大学计算机系

出　　处：《计算机研究与发展》1998年第5期455-459,共5页Journal of Computer Research and Development

摘　　要：文中描述了事件－条件－动作（ＥＣＡ）规则的设计以支持ＯＯＤＢＭＳ中的主动能力，并描述了在Ｃ＋＋环境中的具体形式．它支持除了传统的数据库事件外的时序的、显式的、复合的事件．并引入了一组运算符来构造复合事件．还引入了事件接口的概念，这种事件接口被用作说明跨越几个对象或不同类的对象的事件，检测和通知事件的出现．提出了反应对象和可通知对象的概念，将事件和规则都统一为对象．还引入了在规则和对象间的订购机制以监视所选择的对象．Here described are the design of event condition action(ECA) rule to support the active capability in OODBMS and its implementation in C++ environment. It supports temporal,explicit and composite events in addition to the traditional database events.A set of event operators are introduced for building composite events. A concept of event interfaces is also introduced. These event interfaces are used to describe the events spanning objects, possibly from different classes. They are also used to detect and signal the occurrence of events. The concept of reactive and notifiable objects is proposed to unify events and rules into objects. A subscription mechanism between rules and objects is also introduced to monitor the objects selectively.

关 键 词：面向对象 数据库管理系统 ECA规则 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]