The Research On Methods Of Date Integration In Virtual Datebase Technology

With the rapid development of the computer technology and computer hardware, the number of the information which people can access and the number of the users growes more and more explosively. There comes a challenge to the research on the database field: How to satisfy the growing number of users who access to the diversity of information requirements. Howerer, there is an unavoidable topic. That is the problem of heterogeneuous data sources which includes heterogeneous hardware, software platform and the logical structure of heterogeneous data. The information which stored in different data sources is often interrelated. Data sharing and integration between different data sources has become a problem.The subject fully analysis the specific needs of its original demand in the new structure inadequacies, and analyze current several kinds of popular data integration technology between heterogeneous data sources, through their respective characteristics and comparison of the shortcomings, the subject proposed topics for the three-layer structure of the virtual database structure design. Three-layer structure of the system is divided into user interface layer, intermediate layer, the underlying data source layer. Intermediate layer provides users with the services to access the heterogeneous data sources from the bottom of the data sources layer.This paper discusses the methods of three-layer architecture in this specific application forms, it has some of the problems encountered in this subject. And it gives for solutions to improve the methods and structure, such as the user interface layer interface agreement design, an intermediary layer of meta-data information management strategy, which includes information format element, according to a unified strategy, elements, according to information extraction and update strategies. There is a strategy of temporary data and returning the results in the process of data access in the intermediary layer, the underlying data source layer, such as database connection strategy. These strategies for future research in related fields give a certain reference value.Subject defines the user interface layer to develop a set of class interfaces, and uses the Webservice technology to pack the services for releasing on the network to improve the reusability of the system code.Finally, system uses the popular technology, low-cost hardware. Virtual database technology is a new form of application in the telecommunications network management system.