The Study On The Data Integration Technology Under Heterogeneous Database Environments

With the rapid development of Internet, the network is rapidly becoming an important means of information dissemination and exchange, on the Web a wealth of information resources. To make more effective use of these data in a unified platform for data integration and visit.The traditional way of data integration is far from the people's need of obtaining data. There are a lot of defects in dynamic adding or deleting data sources, supporting the interoperability among heterogeneous data sources, the way of making data sources content as models and custom query and so on. Thus the paper proposes a kind of design and realizing program, which uses XML data transforming format, XML Schema to built public models, and Heterogeneous Data Sources Integration Middleware (HDSIM). To set up a public integrated environment under distributed environment, which shields all differences in aspects of data source including the platform, system environment and internal data structure, and so on. It provides a unified and transparent interface for users to implement the accession and publication of relative data among heterogeneous data sources. The following is the main study of the content:1) The design of the mediator of heterogeneous data sources integration. Present and design HDSIM, which based on XML as shared data transforming format.2) The design and realization from the public model to XML model. Through the analysis of the public model of databases and XML Schema, the transform from relation schema to reasonable and effective XML schema is proposed.3) The structure design and the arithmetic flow of the data inquiry processor and result integration processor. The inquiry assign arithmetic is presented. The inquiry assign arithmetic based on GAV technique is improved in the aspect of...