The Design And Implement Of Data Exchange And Synchronization At Real Time Between Portal Web Site And Internal OA

With the prevalence and broad application of Internet, especiallye-government system constructed gradually, many works done bygovernment can be completed on Internet. "Information Isolated Island"will appear if the applications used by different departments are notplanned consistently during the e-government being constructed, thus it'sdifficult to share information. As far as a certain department is concerned,the data will be redundant and inconsistent and the data of internal andexternal applications can't not be updated synchronously if the applicationdatabases of internal and external networks are not planned well. One ofthe effective methods to solve the above problem is to build a datainterchange system.This paper presents a Government Data Interchange Model (GDIM) on demand of data interchange between website and internal office network ofChun'an County. GDIM is based on the outer suspended encapsulation ofMeta Data Model, which can support an environment of transformingdifferent data format; the data can be reintegrated, extracted, analyzed andencapsulated between different systems, and then transferred to anothersystem to make the data more re-useful. Based on XML which becomes astandard recently, this paper applies it to universal data interchange modeland creates some tools to make the system administrator transfer the databetween different systems more conveniently. Thus, it can improve theefficiency of developing system and data re-use, decrease the cost ofdeveloping software and maintain data easier.The system has following primary modules and functions:1) File Transform Rules System: it processes data transform rules fromdatabase system. It aims at processing the file format inputted and dataschema and transferring it to data interchange system in the structure ofDOM for future transform.2) Data Transform Process System: it transforms and extracts entity file ofdatabase system, rewrites it into XML format in terms of the previousstructure and relation, and then transforms it into tree-shaped data, thusdata interchange and reuse can be improved.3) Data Interchange Process System: it extracts the data reintegrated fromdatabase and transfers it to other applications by some descriptionlanguages, including HTML, CSS (Cascading Style Sheet), etc., interfaces and programs in order to interchange data.Compared with other data interchange systems, the system ischaracteristic of following: based on XML; applying XML to general datainterchange model to transfer data between different systems for systemadministrator. It can improve the efficiency of developing system, datareuse, decreasing the cost of developing software and data maintenance.