Research And Implementation Of Data Access Gateway For Information Integration Application

This thesis studies the problems on how to provide access to the information integrated end to information sources.As to the information integration applications, there are two major kinds of integrated way, one is to materializing views of information integration based on, the other is to virtual view of information integration based on. The problems arise under the materialized views condition, including the query of primary synchronized data when the materialized view is created;a distributing target in the information source point is set up and the incremental data is received etc.But, the problems arise under the virtual view including the query of export schema of information sources. The resource agent system supplies two kinds of way for information integrated. The concern of this thesis is to separate the access information sources module from the integrated system and make it work as a proprietary module, which is called data access gateway. From the perspective of accessing information sources, the thesis contributes to the following jobs:We, Firstly, set up the information source configuration information library,and take configuration information as the information source metadata; then Study the format of the metadata, To information source logic name as keywords,establish mapping relationship between the source logic name and the access of information source for achieving transparent access target.Second, the implementation of data access gateway is divided into two parts: client end and server end. The client end is deployed in the integrated end, serving as requestor for data access; the server is deployed on information source, serving as suppler for data. The interchange procedure of data is handled by data access gate, providing a many-to-many accessing way.Third, according to the demand of accessing to information source, the integrated end for accesing to information is implemented including the task of data query, dispatching the requesting definition and monitoring incremental data and so on. In addition, the method for optimizing performance and enhancing efficiency is discussing here.Finally, By the work of above, a good performance data access gateway is implemented,which provides reliable and highly efficient data access services to the information integration system.