The Application Of Distributed Module Model In The Development Of WEB Database

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.