To establish the object-oriented (O-O) engineering for vehicle body design Methods characteristics of vehicle body design data were analyzed by means of theO-Omethod The analytical results were transformed intothe eng...To establish the object-oriented (O-O) engineering for vehicle body design Methods characteristics of vehicle body design data were analyzed by means of theO-Omethod The analytical results were transformed intothe engineering databasethat canbeusedsufficiently to describe the relative information of vehicle body design data.Results TheO-Oengineeringdatabaseforvehiclebodydesignis realized and practiced in the process ofbody design for a QCJ7082 economical car. Conclusion The method is successful in trans- forming vehicle body design object into engineering database.The database supports each procedure of vehicle body design perfectly展开更多
We introduce a model to implement incremental update of views. The principle is that unless a view is accessed, the modification related to the view is not computed. This modification information is used only when vie...We introduce a model to implement incremental update of views. The principle is that unless a view is accessed, the modification related to the view is not computed. This modification information is used only when views are updated. Modification information is embodied in the classes (including inheritance classes and nesting classes) that derive the view. We establish a modify list consisted of tuples (one tuple for each view which is related to the class) to implement view update. A method is used to keep views from re-update. Key words object-oriented database - incremental computation - view-computation - engineering information system CLC number TP 391 Foundation item: Supported by the National Natural Science Foundation of China(60235025)Biography: Guo Hai-ying (1971-), female, Ph. D, research direction: CAD and engineering information system.展开更多
以一所高校学生学籍管理系统的数据库设计为例,按照软件工程中结构化的分析与设计方法,对管理系统进行了需求分析,在此基础上对数据库进行了概念设计和逻辑结构设计,用SQL Server 2000进行了数据库物理设计与实现,给出了学生学籍管理系...以一所高校学生学籍管理系统的数据库设计为例,按照软件工程中结构化的分析与设计方法,对管理系统进行了需求分析,在此基础上对数据库进行了概念设计和逻辑结构设计,用SQL Server 2000进行了数据库物理设计与实现,给出了学生学籍管理系统数据库设计的全过程。展开更多
数字高程模型(DEM)是进行三维分析的核心数据,其在诸多领域起着辅助设计与决策的作用。随着多尺度DEM数据的急剧增多,要求对DEM数据进行高效存储与管理,同时对DEM数据的安全、快速、实时的多用户访问提出了要求,空间数据库的管理模式是...数字高程模型(DEM)是进行三维分析的核心数据,其在诸多领域起着辅助设计与决策的作用。随着多尺度DEM数据的急剧增多,要求对DEM数据进行高效存储与管理,同时对DEM数据的安全、快速、实时的多用户访问提出了要求,空间数据库的管理模式是适应这种要求的最佳解决方案。对多尺度DEM数据库内容进行了详细分析;通过对空间数据库技术的各类方案进行对比,选用ArcSDE for SQL Server进行建库工作,实现了空间数据与属性数据的统一存储;采用Arc Engine(AE)开发方式开发了数据库管理系统,并以实验地区的DEM数据库系统建设为例,完成了数据库基本操作功能模块的开发与设计,实现了各类数据的查询、浏览和管理功能。展开更多
文摘To establish the object-oriented (O-O) engineering for vehicle body design Methods characteristics of vehicle body design data were analyzed by means of theO-Omethod The analytical results were transformed intothe engineering databasethat canbeusedsufficiently to describe the relative information of vehicle body design data.Results TheO-Oengineeringdatabaseforvehiclebodydesignis realized and practiced in the process ofbody design for a QCJ7082 economical car. Conclusion The method is successful in trans- forming vehicle body design object into engineering database.The database supports each procedure of vehicle body design perfectly
文摘We introduce a model to implement incremental update of views. The principle is that unless a view is accessed, the modification related to the view is not computed. This modification information is used only when views are updated. Modification information is embodied in the classes (including inheritance classes and nesting classes) that derive the view. We establish a modify list consisted of tuples (one tuple for each view which is related to the class) to implement view update. A method is used to keep views from re-update. Key words object-oriented database - incremental computation - view-computation - engineering information system CLC number TP 391 Foundation item: Supported by the National Natural Science Foundation of China(60235025)Biography: Guo Hai-ying (1971-), female, Ph. D, research direction: CAD and engineering information system.
文摘数字高程模型(DEM)是进行三维分析的核心数据,其在诸多领域起着辅助设计与决策的作用。随着多尺度DEM数据的急剧增多,要求对DEM数据进行高效存储与管理,同时对DEM数据的安全、快速、实时的多用户访问提出了要求,空间数据库的管理模式是适应这种要求的最佳解决方案。对多尺度DEM数据库内容进行了详细分析;通过对空间数据库技术的各类方案进行对比,选用ArcSDE for SQL Server进行建库工作,实现了空间数据与属性数据的统一存储;采用Arc Engine(AE)开发方式开发了数据库管理系统,并以实验地区的DEM数据库系统建设为例,完成了数据库基本操作功能模块的开发与设计,实现了各类数据的查询、浏览和管理功能。
