Research And Implementation Of Autonomous Heterogeneous Information Query System Based On Message Queue

The traditional centralized database system can't satisfy the demand of data sharing and interoperability more and more, because it ignores the demand of the distributed applications and emphasize centralized management of the data excessively. It has already been in great demands that how to share the data efficiently by utilizing the existing network and data resources fully on the basis of not influencing the independent characteristics of the distributed databases. A multidatabase system is one of the most successful and extensive methods of resolving the interoperability among autonomous and heterogeneous databases. Having researched the query methods and key technology of autonomous database system under this application background, the paper designs and implements a prototype system based on message queue.The paper researches the query methods of multidatabase deeply and gives a new solution of query system of multidatabase. The method avoids the limitation of the traditional solution and improves the dependability of system in which a data center server works as the center. Having researched heterogeneity elimination of multidatabase, the paper gives a solution that data heterogeneity is resolved by XML and realizes transparent query. The paper also designs a method of mergence of XML files based on DOM technology and resolves data mergence.The paper designs and implements a query system of autonomous and heterogeneous information. The system adopts a new kind of framework scheme, in which a data center server works as the center. Data heterogeneity and the mergence of query results are resolved by XML. The query and data are transmitted by message queue middleware. The system resolves the query of distributed information by masking the heterogeneity of the local databases and offering a unified query interface to the user. According to the demand of the applications, the paper also describes the query methods that users are often involved and puts forward the corresponding solution.