Study On Dynamic And Distributed Persistent Data In ERP System About Tobacco Industry Enterprise

With the development of the market economy and information technologies, a successful ERP (Enterprise Resource Planning) system must be satisfactory to enterprises business process reengineering. As well, the enhancement of enterprises operation concern needs an ERP system must be global. This means that a contemporaneous ERP system must have excel performance either in dynamic characteristic or in distribution. Dynamic and distributed persistent data in tobacco industry, which are the basis of dynamic and distributed ERP, are studied in this thesis.First of all,the persistent objects are abstracted into master data, dynamic data and statistical data by function, and also are divided into generalized table structure and generalized recursion structure from the aspect of data structure, which are used to model persistent object. Applying J2EE standard distribution architecture will specify software structure, balance system load, facilitate legacy system integration, simplify the selection of application servers and develop tools, unify security style and support inhomogeneous environment. The MVC design pattern focusing on separating persistent data objects, control logics and user interfaces is needed for implementing dynamic and distributed ERP. The design program that dynamic persistent objects are mapped to relation database and the design thought that persistent objects are constructed on the basis of the abstract data model are brought out and a three-layer model, which is consisted of a business object layer, a persistent object layer and a persistent storage layer, is given, a set of reusable persistent data access components is realized, which proved the feasibility of the thought that an abstract data model component is constructed first and bound dynamically with the concrete physical storage structure lately in the deployment phase. Finally, an example presents that a unified data access object layer is added above different data sources to provide transparent access of the data sources for business objects.Through the Study on the dynamic and distributed of persistent data, the problem of the structure of persistent objects and their uncertainty is solved, which enforced the extensibility and maintenance ability of ERP systems.