一种改进的主动规则的系统执行模型  

An Improved Active Rule System Executing Model

作　　者：李庆忠[1] 王海洋[1] 姜跃平[1] 马绍汉[1] 董继润[1] 

机构地区：[1]山东大学计算机科学系,山东济南250100

出　　处：《软件学报》2002年第1期111-117,共7页Journal of Software

基　　金：国家自然科学基金(69473013);国家九五攻关项目(96-B03-04-03-12)~~

摘　　要：主动规则及规则处理机制一直是主动数据库研究的薄弱环节,主要表现为:(1) 语义不够丰富;(2) 缺乏基础语义;(3) 缺乏对规则处理的层次化和结构化的描述.为弥补上述不足,对规则处理机制赋予了丰富的规则延伸语义,根据语义的要求,用规则处理树层次化和结构化地描述规则处理过程对系统状态的影响.新的系统执行模型和扩展后的事务使我们能够提出一种支持丰富语义的规则处理算法.与其他规则处理算法相比,该算法实现了新语义,并利用了递归技术,能更好地吻合规则处理过程.Active rules and its processing mechanism have been the weaknesses in the research area of active database for a long time. The weaknesses were mainly represented: (1) The semantic of rules is not rich enough; (2) Lack of fundamental semantic; (3) Lack of hierarchical and structural description of rule processing. In this paper, in order to make up the above weakness, a rich extending semantic is given to the rule processing mechanism. A rule processing tree is represented to describe the influence of rule processing to the state of system structurally and hierarchically. Based on the new system executing model and the extended transaction model, a rule processing algorithm that supports rich rule semantic can be represented. Comparing with other similar algorithm, the algorithm implements the new semantic. The using of recursive technique makes the algorithm coincide with the rule processing.

关 键 词：主动数据库 ECA-规则 主动规则 系统执行模型 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]