The Research And Application Of Distributed Data Query Based On Mobile

At present, there are many methods of the distributed data query question' solves, but all are not entirely as desired. In theory the distributed database technology proposes one kind solution based on the overall situation pattern for this deficiency, but the price of establishing and maintaining the overall situation pattern are too high; the method based on Mediator technical establishes wrapper for each data pool, but the complexity is high: Web Service technical realizes the query through founding web service for each data pool, but the reliability of network request high, the network load is big. Therefore, one kind of distributed query application model that are highly effective and agile, compatible and the strong ability of permit mistaking is needed to study and design.This article uses the mobile agent technology, fully uses its characteristic of mobility, independency and intelligence.. Through saving the query service to the mobile agent that can carry on through the network, the mobile agent will move to the server, execute the query and save the conclusion, then it will return to the user. This produces one kind of new distributed query application model. This model has the superiority of the high query efficiency, the support interrupted computation and the strong network compatibility,.First this paper studies the distributed database query and other distributed data query realization technologies , analyzes its deficiency , then through researching the background, system structure and essential technology of the mobile agent technology. It explores the feasibility and the technical superiority which the agent technology combine with the distributed data query in theory, unifying the MA design pattern, it designs a kind of distributed data query application model based on the MA technology. This model has the superiority of the high query efficiency , the support interrupted computation and the strong network compatibility . Finally it produces the distribution query plan for the water conservation foundation database system, and carries on the experiment to the essential technology of this plan, it proves that the model is feasible and it has the obvious superiority in the aspect of supporting interrupted computation and network compatibility.,...