The Application Research Of Heterogeneous Data Source Integration Technology In Military

With the development of China's military information construction, the software system used in the Army will be more and more. Although these systems focus on different areas, there are functional and cross-cutting links. The systems "integration" will eventually become a major problem, and cross-system applications will be enormous difficulties. With the increased demands of the Army's application, how to search them and provide a unified, consistent interface, thereby eliminating the "islands of information", which become a difficult problem in the informationization of the military.The main studies as follows:1) Select the integration technologies in the current mainstream of Heterogeneous Data Source Integration Programs, and complete integration framework design.2) To study and develop the public data model and the data schema.3) Inquiry decomposition technology is the key component, and its study of the project to be implemented.4) To study the security mechanisms, and to select the access control strategy.By analyzing the Heterogeneous Data Source Integration System basic framework, the project establishes the Heterogeneous Data Source Integration Architecture which bases on the global data schema. It uses XML-Schema definition of integrated data model as the Integrated System of a public data model. On the topic of meta-database design, it completes the schema mapping, and using XQuery as the global query language. And it retrieves data using the inquiries decomposition algorithm. Meanwhile, the project uses lightweight role-based access control strategies to improve the overall system security. It mainly includes:1. The framework design of Heterogeneous Data Source IntegrationOn the basis of current domestic and foreign Heterogeneous Data Source Integration Framework, we study the integration framework which addresses the special nature of military applications. In ensuring the normal operation of the system on the basis of improving the overall system robustness and security, while improving the efficiency of the system.2. Building integrated data schema of the system based on XML-SchemaWe establish the Global Data Schema to meet the current demands of military projects. This global data schema uses XML-Schema and references the design concepts of GML (Geography Markup Language). The project establishes the mapping between the global data and local data sources.3. Research and Implementation of the query decompositionThe Query process is one of the critical technologies in the heterogeneous data integration system. Query decomposition, as well as query scheduling and query optimization is the current core content. The project decides to adopt XQuery as the global query language through research XQuery language features, and this paper provides the entire inquiry process. While shielding the differences of local data sources, the system completes mixed inquiries in multiple data sources.4. Security mechanism of the systemAgainst safety requirements of military application, this paper researches the Role-Based Access Control (Role Based Access Control, RBAC) strategy, and completes the lightweight access control strategy in the actual project. It uses the meta-database to increase the role, the user, and adds mappings between them. This ensures the information security of data source and meets the present security needs.The framework uses XML Schema as global data schema, XQuery as a global data query language and wrapper for translating local query language. This masks heterogeneity of local data sources. The system can integrate different data including relational database systems, file systems, the Web information system and others. Depending on the metadata mapping technology, it can complete data translation. The framework further improves overall security through combine role-based access control strategy.