摘要
随着计算机技术的不断进步，特别Internet技术的迅速普及，使得基于WEB的数据库应用已经广泛深入到包括网上办公、网上购物、电子商务等各行各业中，WEB数据库应用的开发技术也随之经历了巨大的发展。传统的客户/服务器结构已经不能适应Internet这样一个复杂的分布式异构环境，而由面向对象技术和分布式计算技术相互融合发展起来的分布式组件模型以其高性能、跨平台、可移植、可伸缩等特性逐渐成为WEB数据库应用开发的标准技术。
在这样的背景下，本文通过对分布式组件模型原理和体系结构的研究，探讨了它们在WEB数据库开发中的应用。并针对EJB(Enterprise Java Bean)模型提出了一种建立WEB数据库应用的结构模型，在此基础上实现了一个演示系统。全文共分5章，每章的基本内容包括：
第一章回顾了应用程序体系结构的发展历程，概述了各种WEB数据库应用的开发技术，对其进行了分析和比较，在此基础上提出了本文的研究内容和意义。
第二章从组件技术和分布式对象两方面研究了分布式组件技术的基本结构，在此基础上对CORBA、和J2EE两种分布式组件模型进行了概要介绍。
第三章详细介绍了EJB(Enterprise Java Bean)模型的体系结构，分析了EJB模型给开发者和用户带来的好处，并讨论了EJB模型与CORBA的关系。
第四章在前面各章的基础上研究了使用EJB建立商务模型，访问数据库的方法，提出了一种建立WEB数据库应用的结构模型。并从网络流量、数据库访问和数据安全等角度对此结构模型进行了分析。
第五章描述了一个基于EJB分布式组件模型的应用开发实例。
With the increasing development of computer technology, especially the Internet, which is becoming universal quickly, the database based on WEB is widely used in all trades and professions including office work and shopping through Internet and E-commerce. Hence the development technology of the application of WEB database is undergoing rapid growth. The traditional client / server structure can't adapt to the Internet, a complicated distributed isomerous environment any longer. And the distributed module model, developing from the blend of object-oriented technology and distributed computing technology, is gradually becoming the standard technology of application of WEB database for its advanced function, transflat, portability and flexibility.
Under such background, this thesis, through the research on the principles and architecture of distributed module model, probes into its application in the development of WEB database. And a structure model, in accordance with EJB (Enterprise Java Bean) model, is proposed to fulfill the application of WEB database. On the basis of this a demonstration system is achieved. The thesis can be divided into five chapters.
In chapter one the development of application architecture is reviewed and all kinds of development technologies of WEB database are briefly introduced and analysis and comparison are made towards them. On the basis of this the content and significance of the research is proposed.
In chapter two the basic structure of distributed module technology is studied from two aspects: module technology and distributed object. On the basis of this a brief introduction is made towards the two distributed module models: CORBA and J2EE.
In chapter three the architecture of EJB model is detailed and the advantages which the EJB model brings to developers and users are analyzed and also the relationship between EJB model and CORBA is discussed.
In chapter four the method of setting up commercial model with EJB and calling database is studied and a structure model is proposed to fulfill the application of WEB database . Also the model is analyzed from the aspects of network flux, database call and data safety.
Chapter five is about the description of application example of distributed module model based on EJB.
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