Research And Implementation Of J2EE-Based Data Access Middleware

With the requirements of enterprise for distributed processing and the rapid development of Internet information network, present network information systems propose higher requirements for efficiency of data interaction, data security and system extensibility. Current database access middleware cannot meet the need of network information system application said above.There are two data access choises on a J2EE application. One is the non-OOP JDBC RowSet,the another is the entity beans of EJB. It is well known that both of them exist obvious limitations.This thesis firstly analyses the problems that water information system is facing while developing data access middleware on J2EE platform. Combining the development trend of current middleware technologies, the article conceives a model of water information data access middleware based on B/S structure and J2EE platform.The model use the light container and O/R Mapping technique to build persistence layer. This design give the solution of Object-Relational impedance mismatch and ensure the service that data access middleware is needed.As a rusult,the middleware has the enough extensible ability to adopt user define optimize means.To aim at the situation on data sharing service of water information system that the number of query exceed update much more,model make use of the object cache technique to cache the business logic computer result. The access performance and multi user concurrent respond time improve. To meet the need of globle query,the paper design a optimization framework base on code shipping and then discuss the compnent and implements of this framework.Finally, the thesis discuss the application of this model in the Jiangsu water conservancy fundational database system and evaluate its feasibility and efficiency by comparison and testing. It provides a model which can be referenced in this domain.