摘要： 针对支持复杂实时应用的实时数据库管理系统,提出了一种面向主动对象的实时数据模型AOORT,将面向对象实时性和主动性更好地集成在一起。模型由对象、关系和规则3部分组成。对象用来对带有时间特性的实体进行建模,扩展了传统对象来提供实时和主动特征;关系描述了对象之间的联系情况;规则体现了数据库的主动性,并集成了时间约束。最后以一个简单网络化控制系统中的实时数据

关键词: 主动对象, 实时数据库, 主动数据库, 数据模型, 规则

Abstract: This paper presents a real-time data model of active object oriented(AOORT) which incorporates object-orientation,real-time,and reactive behavior for complicated real-time databases.AOORT is composed by objects,relationships and rules.Objects are used for modeling real-world entities,extending traditional object model to support time-constrained data and activity.Relationships are used for modeling relationships among objects.Rules are used for modeling logical and temporal consistency constraints and activities of objects.Finally,the paper illustrates how AOORT can be used in practice,a supervisory control and data acquisition system in a simple networked control system is used.

中图分类号: 

• TP311.13