Distributed Database Access Component And It's Application In EC

Distributed computing techniques usually describe those distributed application systems whose aims are sharing resource and cooperating with each other. Thercfore ,they are usually developed > deployeds managed and maintened on the network computing platform. Currently,three models of the software component are 萇RBAN DCOM and Java EJB.At the beginning of the thesis, three models are compared, and on this basis, Java and 萇RBA techniques are used to design and develop a component named DAB , which can access most kinds of database. This component offers an uniform interface for ali application softwares, by which you can access most kinds of databases transparently (if only the database sustains JDBC or ODBC). In order to improve the performance of the component, the technique of database connection pool is used internallv, and in the process of disposing the data muster, the Java Object Sequentializing technique is used. On the other hand, a general method of disposing the data muster is presented to non-java language client. The efficiency of this method is lower than the foregoing.As an application of the DAB, an electronic commerce website named "VangHua Bookroom" is developed by the author.lt includes two parts: online order and online management.In the online order block, SSL protocol is used,and a moresecure technique------Dynamic Password Authentication is used in the check-outprocess. In addition, an application is developed to produce the card number and password on the server end by C++ Builder.