Intergration Of Heterogenous Database Based On XML

For a long time, there are some different platform and different technology development in the enterprise or in the department application systems because a series of reasons--lacks of the experience and the whole plan and so on. These systems, as a result of the computer architecture isomerism, operating system isomerism, database structure and semantic isomerism, DBMS reasons and so on, have formed independently"the information isolated island"gradually, Because XML has nothing to do with the platform, easy to expand, interactive good, semantics strong, to be possible to format and so on, This causes XML to become the Web data expression and the exchange new standard and plays the middleware role between in isomerism relational database's exchanging and realizes various isomerism database information exchange.This thesis is based on the XML data mapping algorithm and in the model in the research foundation, compared to the traditional isomerism and carry on the comparative analysis according to the integrated technology. By the XML transformation tool, through the relational database and the XML reversible bilateral change, establishes isomerism relations database the unification transformation tool. The change process may retain the relational database the entity integrity restraint, the reference integrity restraint and the major part user from the definition integrity restraint.This thesis has proved theoretically the middleware causes isomerism database to become"the isomorphism"the algebra system and explained that realizes isomerism data integration possibility. Realizes general algorithm which transforms mutually XML and the relational scheme, pointed out that this algorithm is one kind of contraction mapping. Uses development kits JBuilder2006, Jdom, and so on, has developed the special-purpose transformation tool. This special-purpose transformation tool using the interface technology and revise slightly, may become the common tool. In analysis changing process some difficulties, in union specific items processing changing process difficulty. Is transformation tool can good complete the database the integration, realizes the switching process automation, and enables the user conveniently to the Internet/Intranet issue information. Has provided the technical base for the user isomerism data pool in the top level integration.