摘 要
步入90年代，关系数据库管理系统产品日趋成熟。为适应时代发展的需要，许多新型数据库模型应运而生，时态数据库便是其中一份子。时态数据库是人类创造力在时间维上的延伸，旨在高效地存储和利用时态数据，它在自然现象观测、自然灾害对策、古地质研究、考古和金融股票方面的应用在国外已经开始试用，并不断有原型和报告发表。本文所涉及到的Hbase便是一个32兆内存模拟时态主存数据库的原型。Hbase从第一次用Pascal语言在DOS平台上开发到现在用Visual C++ 5.0在Windows 95平台上开发，经历了三次升级。而且还以Hbase for Windows 2.5版为核心，与四川省科技情报所合作，成功地开发了一个Internet机器翻译系统，即信译系统。
数据操纵语言是一个数据库管理系统的重要组成部分，用户通过这些语言对数据库进行修改。数据操纵语言使用方便、快捷与否，直接影响该数据库管理系统的市场前景。在Hbase的移植过程中，本文主要做了以下工作：
(1)介绍Hbase的背景和结构体系；
(2)改造、调试工具模块；
(3)分析工作区模块；
(4)讨论数据操纵语言的开发方法；
(5)改造、调试数据操纵语言的连接模块；
(6)改造、调试数据操纵语言的投影模块。
关键字
时态数据库 数据操纵语言 连接 投影 移植
Abstract
Relational Data Base Manage System has been more ripened since 1990. For the time’s development , many new data base models were introduced , such as Temporal Data Base Manage System ( Temporal DBMS ) . Temporal DBMS is the extension of human creativity in time dimension , with the ability of storing and using temporal data efficiently . Its application on the observation of natural phenomenon , the tactic of handling the natural disaster , the research of the antiquity geology , archaeology , finance and stock , had being in use on aboard , further more many prototypes and reports had been published successively . Hbase , which is introduced in this paper , is just a prototype of Temporal DBMS over 32M memory platform . Its first version was completed by Pascal in DOS , but its latest version is to be achieved by Visual C++ 5.0 in Windows 95 . In the cooperation of SiChuan Union University and SiChuan Science and Technical Information Institute , we successfully developed an Internet machine translation system called Xin Yi System based on Hbase for Windows 2.5 .
Data Manipulation Language ( DML ) is one of the main component of DBMS , and users can use it to modify DBF directly . The friendliness and performance of DML influence the prosperity of this DBMS’s market . In this transplant , the main contribution of this paper are :
(1)Introduce the background , construct system of the Hbase ;
(2)Modify and debug the Tool model ;
(3)Analyses the WorkArea model ;
(4)Discuss the method to develop DML ;
(5)Modify and debug the Join model of DML ;
(6)Modify and debug the Projection model of DML .
Key Word
Temporal DBMS DML Join Projection Transplant
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