First , in this paper , a paraconsistent relational data model and its algebraic operators are introduced briefly . then , paraconsistent relational calculus based on this model is discussed and domain relational calculus for paraconsistent database is presented 本文首先简要介绍了次协调关系数据模型及其代数运算,并在此基础上进一步讨论了次协调关系演算,提出了次协调关系上的域关系演算。
At the same time , we propose a representative data model , i . e . gt data model , and its query language . theoretically , we deeply study the temporal relational algebra and sql - like language based on our ter model , laying a solid theoretic foundation for our accelerator rjf cavity design system 因此,论文提出了一个概念性数据模型,即时态实体一关系数据模型( ter模型厂提出了一个表示性数扼模型,即gt数据模型及其查询语言。
In this paper , the basic concepts of rough sets theory and research actuality of combining rough sets theory and relational database is introduced , the efficient algorithm of attributes reduction , correlative definition and algorithm of reduction in database and the rough relational database model is presented 本文介绍了粗糙集理论的基本概念和它与关系数据库中的研究现状,给出了高效的属性约简算法、数据库约简的相关定义和算法、粗糙关系数据模型。
The data and the function requirements for this database system are deducted firstly by the analyzing of the data flow fig and the compiling of the data dictionary . then , the local e - r fig and the whole e - r fig are obtained by concept structure design . the database physical design is finally completed by sql server 2000 and the whole structure of the database is built 首先通过分析系统数据流图,编写数据字典,得出数据库系统的数据和功能需求;然后经过概念结构设计得到数据库局部e ? r图和全局e - r图,经过逻辑结构设计将e ? r图转换成关系数据模型;最后采用sqlserver2000作为工具完成了数据库的物理设计并建立了数据库的全部结构。
Firstly , the problem that the analysis of function and the analysis of data are separated in the course of traditional analysis and design is analyzed , and that the effective approach to solve this kind of problem is the using of object - oriented technology is pointed out ; secondly , in the phase of system analysis and design , ooa model is used to describe the analysis of demand , and the rules of conversion between object - oriented model and relationship model are put forward 首先,分析了传统的分析设计中存在的功能分析与数据分析相分离的间题,指出了应用面向对象技术是解决此类问题的有效途径;然后,在系统的分析设计阶段,使用了ooa模型对系统的需求分析进行描述,给出了面向对象模型到关系数据模型的转换规则。
Based on the stock exchange , this paper described the approach of conceptual multidimensional data modeling based on multidimensional e / r model in detail , and used it to model the stock exchange subject , then compared it with the existing multidimensional data models . based the applications , this paper described systemically the multidimensional data modeling techniques , and stated classifiedly the main operations used in this technique with formalization means . this paper stated vividly the approach of building the multidimensional data model based on the relation data model 针对证券行业这样一个特定背景,在详细分析基于me r的多维数据概念建模方法的基础上,运用它对股票交易主题进行了概念建模,同时也把me r模型与常用的多维数据模型进行了对比;根据课题背景,对基于关系数据模型的多维数据建模方法进行了详细地阐述。
And how to build a data warehouse system based on miss , how to build a multidimensional data model based on relation data model attract human ' s general attentions . on these situations , this paper concluded the concept , motive , basic techniques , key problems and the present situation of researching of multidimensional data modeling seriously 本文基于这样一个现实背景,对多维数据建模的概念、目的、基本方法、关键技术、国内外研究现状进行了深入地归纳总结;对基于关系数据模型的多维数据建模方法进行了系统总结,并用形式化方法对其主要操作进行了分类描述。
Traditional information system usually has to change a lot of program due to the alternation of business process , regulation of organzation and people , etc . in order to accelerate the process of system development , adapt to the regulation of office workflow in the process of system running , enhance the system flexibility , we development a set of wfms based on relational database which named jkcflow . this system can be used to the definition , browse , and running control and monitor in the information workflow of office automation . in this article we describe the designing idea and construction method of jkcflow 建设项目管理信息系统的开发过程中对业务流程的管理是系统开发要解决的核心问题,传统的mis系统经常由于业务流程变动,机构和人员的调整及其它一些情况的变化而要做大量的程序调整和修改工作,为了加快系统开发进度、适应办公业务流程在系统运行过程的调整,增加系统的灵活性,我们基于关系数据模型开发了一套工作流管理系统jkcflow ,用于建设项目管理系统中的信息处理流程定义、修改及运行控制和监控。
The view of combining of conception data mode and data warehouse has been pointed out . the main content of the paper includes the history of mis development , concept and developing methods , many questions in building mis and the traditional dealing ways . after that the paper expounds the theory of reference conception design , contract relationship theory and using of script building tools with parts 论文的主要内容如下:首先讲述了mis系统的发展历史,并介绍了mis的概念和开发的手段,其中包含了在开发mis过程中遇到的问题和传统的解决方法,然后分章节着重介绍了用于开发mis关系数据模型的参照式概念模型设计理论,用于面向对象程序设计的合约关系理论,以及脚本工具生成技术在mis快速成型技术中的应用。
It took the model driven as software developing pattern , and started at the mapping between relation data model , and supported by mof and mda , and referenced frame technic , and provided the resolvent of existing in information system and improved the efficiency of information system developing and keeping 本课题采取模型驱动的软件开发模式,以关系数据模型之间的映射为研究出发点,以mof 、 mda为整体理论支撑,参考框架技术,为信息系统中存在的一些问题提供了解决方法,在很大程度上提高信息系统开发和维护效率。