Research And Realization On User-defined Query Of Military Geographic Information Based On Rule Engine

Along with the rapidly development of computer technology, the construction of Military Information Digitizing has alreadly entered the superheating stage increasingly.Visualization and primitive query function of conventional military information system can not settle for the contemporary war. In order to seek the geographic knowledge of battlefield environment accurately and profoundly, on the swift growth demand of user service requirement ,more and more widely attention are paid to how to achieve the user-defined military information query. The design idea of conventional military information query is merging the user service logic of query with code,which can hardly separate the service logic from the processing rule, still need programmer to participate ,and can not realize the user-defined query by user. For that, this paper discuss the method to introduce the business engine-Rule Engine into military information system, research and realize the technic of military information user-defined query based on Rule Engine. Rule Engine is an excellent business rule processing tool which implemented the Rete algorithm based on model matching. User-defined query that takes advantage of the Rule Engine which is capable of resolving business rules is used as a logic controller of costomized query module of military information system to face the adding or modifying codes by programmer on conditon that rapid increasement and frequent changing demands are required,and it also help define and analyse query rules,which can be easily expanded.In order to adaptting the structure of military data and environment of military information system ,this paper has expanded fuctions of Rule Engine and done some research of it as follows:1. This paper brought up an user-defined query language,which include accidence, syntax, analysis and trasformition.It also has designed rule model files which is used for saving scheme of query and a promoted algorithm of Rete.2. There was a specific interpretation of Rule Base design, and a discussion of the expandible of several rules in Rule Base. Besides that, it pointed out a rational way of expanding rules.3. This paper has expanded functions of Rule Engine and related technique.In order to adaptting the character of military data, the interface of data accessing has been developed, as a result, a data source model facing military object has been brought forward. 4. As a standard of evaluating times of I/O accessing, By using the cost estimate model of query based on SR- tree which was put forward by the writer to experimentalize and compare with other index, there came the conclusion that the SR-tree index was useful and more effective.