Study On An Improved Distributed Architecture Model And Its Application Under The .NET Framework

With the continuous development of the internet, the network has embedded into the economy in every aspect gradually.. The network application of software is an inevitable tendency. Distributed technique is an important developing direction of current software development technology. A distributed architecture model under the .NET framework is a model which uses distributed technology and computer network adequately. It can intercommunicate in local area network (LAN) and make long-distance data access in the internet. A typical distributed architecture model under the .net framework is composed of 4 layers: user service layer(USL), business transact layer(BTL), data service layer(DSL) and database layer(DBL). The middle layer which is made up of BTL and DSL is the primary part in the model. USL is the appearance layer of the model. User service is a client which realize in application programs. It can be a web client or a windows client or both of them in the distributed architecture. BTL contains business appearance layer(BAL) and business rule layer(BRL). The former which is used for providing uniform interfaces for basic business object separate client from basic business logic. The later actualize business entity or system object and have to complete all kinds of business rules and business logic. DSL includes data control layer(DCL), data expression layer(DEL) and data access layer(DAL). The problem about object-relation map is solved in DCL, which also consider the problem about the endurance of the data entity class. The problems about the mode of data expression are treated with in DEL. DAL executes the task which receive data from a database(or other data service) and send data to a database. The relevant task, in a distributed architecture, is a memorial process which use data adapters and database service. Usually, DBL whose function is data storage and changing is a single database or a database system comprises a series of database. An insurance system under the model of distributed architecture is an exemplification of the distributed architecture model under the .NET framework. During the period of system designing, the key technique has been analyzed, a reasonable architecture has been constructed, and the whole function of the system has been realized.