Research On Object Persistence Based On J2EE

Although Oriented Object Database Management System has appeared, but it's immature;among all kinds of application system currently, the main method of storing and querying data is still the database based on relationship model. How to implementing persistence of all kinds of object using relationship database is necessarily must be solved in orient object programming.In this paper, I analyses the existence of the theory about mapping between relationship model and object model, and throws a scheme of solving the impedance problem between the two models. And then abstract a robust persistence layer, this layer implements mapping between relationship data and object data and some other operations about object like encapsulation, storing and querying etc. Finally, giving some actual patterns based on above persistence layer, and describing every pattern's application scene in detail and analyzing difference with other common methods.We can use this persistence layer in lots of application system byencapsulating it simply based on above theory. Thus, peoples working on application development can save much time on operations about object persistence and concentrate on business issue.