计算机应用与软件2013，Vol.30Issue(4)：69-74,6.DOI:10.3969/j.issn.1000-386x.2013.04.020
基于对象时态稳定性分类特征的双时态ER模型
BITEMPORAL ENTITY-RELATIONSHIP MODEL BASED ON OBJECT TEMPORAL STABILITY CLASSIFYING FEATURE
摘要
Abstract
When modelling the bitemporal database, temporal characters of the objective things are used as the start point, the point, combination set and label of bitemporal in regard to temporal representation are defined. By analysing the temporal stability of objective target, it is divided into temporal constant object or temporal variable object. Referring to the basic design method of database conception structure, the bitemporal entity-relationship model based on object temporal stability classifying characters is presented, moreover, the basic graphic elements and related creating rules are defined. Using this model, the data redundancy caused by abundant temporal-irrelevant attributes in the mode can be effectively reduced. Finally, the mutual conversion method of this model and the more generally used BCDM are introduced for providing it with applied value of promotion.关键词
双时态ER模型/时态稳定性/双时态标签/BCDMKey words
Bitemporal entity-relationship model/ Temporal stability/ Bitemporal time label/ BCDM分类
信息技术与安全科学引用本文复制引用
杨春蕾,王祥雒,郑瑞娟..基于对象时态稳定性分类特征的双时态ER模型[J].计算机应用与软件,2013,30(4):69-74,6.基金项目
国家自然科学基金专项(61142002). （61142002）
