Data Model of Virtual Reality GIS and Its Implementation Based-on Active Object-Oriented Database System

A Object-Oriented Database System

一个面向对象数据库系统

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Set type is an important data type in object-oriented database system and object-relational database system.

集合类型是面向对象数据库和对象-关系数据库中的一种重要的数据类型。

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The main task of storage subsystem in object oriented database system ( OODBS) is not only to deal with volatile objects, but also to manage and store plenty of shared and permanent objects, that's why OODBS is complicated and different from other system.

面向对象数据库系统（OODBS）中存储子系统的主要任务是管理和存储大量的共享、持久对象，而不仅仅是处理挥发性对象，这也是OODBS区别于其它系统或者说其复杂性所在。

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An Approach for the Buffer Management in OODBS

OODBS的一种缓冲管理方法

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M. Halper had presented a methodology based on the metaclass mechanism to incorporate the Part-Whole semantic relationships into OODBs.

Halper等人提出了一种基于元类机制的，将部分-整体语义联系集成到OODBs中的方法。

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With the development of Object-Oriented technologies, OODBS ( Object-Oriented Database system) has been one of the most ubiquitous and promising research and application fields in recent two decades.

面向对象数据库系统（OODBS）是近二十年来随着面向对象技术的发展而被广泛接受且非常具有前景的研究及应用的领域。

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The complexity in concurrency controls should not degrade the performance of OODBs. That is, concurrency controls in OODBs must keep performance while meeting the database consistency requirements.

并发控制中的复杂性不应该降低OODBS的性能，即是，OODBS的并发控制在满足数据库一致性要求的时候，要保持性能。

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Because there are a few OODBs which support the metaclass mechanism, this methodology has limitation to some degree.

但只有少数的OODBs支持元类机制，因此该方法存在一定的局限性。

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For the purpose of this article, I'll take both relational databases ( RDBMS) and object-oriented databases ( OODBS) as one unit, rather than separately.

从本文的主旨出发，我把关系数据库（RDBMS）和面向对象数据库（OODBS）放在一起，不单独讨论。

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Generation of relational model of assembly based on drawings understanding

基于图纸理解的装配关系模型的生成

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The operation of temporal filtration based on historical relational model

基于历史关系模型的时态过滤运算

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Object definition diagram and its conversion to object definition language and relational model

对象定义图及其向对象定义语言和关系模型的转化

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The Research on Storing XML Data Based on General Relational Model

基于通用关系模式的XML数据存储模型研究

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Relational Model Base: Theory and Application

关系模型库的理论及应用

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Comprehensive Evaluation of Performance of Ships Based on Weighted Grey Relational Model

基于加权灰关联模型的船舶性能综合评价

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It's very different from managing according to the traditional relational model.

它与依据传统的关系模型来管理数据有很大区别。

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Checking Consistency of UML Class Diagram with Relational Model

基于关系模型的UML类图一致性检验

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Example: a UML to Relational model transformation

例子：一个UML到关联模型的转换

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This paper discusses how to map object model into relational model, which to save objects.

本文对映射对象模型到存储数据的关系模型的方法进行了探讨。

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Methods of Using XML to Represent m: n Relationship in Relational Model

XML表达关系模型中m：n联系的方法

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