The Design Of The Distributed Database System Based On Delphi And The Application Of The Remote Check Meters System

Since the middle of 20^th century to today, in such short several decades, the rapid development and extensive application of Database technology have exceeded other ones. This article firstly expounds the present developing situation of Database Technology and developing direction of distributed Database Technology, then furtherly and specificly expounds the features and the model designation of distributed database .In terms of the development of modern information technology , present appliance situation and practical requirements of big enterprise managing platform, we analyses the necessarities and applied values of the building of distributed database technology. According to the reality and on the base of the practical appliance of enterprises, the thesis chooses managing system exploiting platform of multilayer and distributed. Based on the features of multilayer database, put forwards the feasibilities and advantages of making the Delphi platform as the as the multilayer distributed platform.Through the further discussion of relative technologies of multilayer distributed database, the security of database and the study of encryption techniques arithmetic, this thesis systemically analyses the basic theories of distributed database; combined with the features of 4th generation GUI programmed language, it introduces the Delphi language and groupware technology briefly; at the same time, it introduces the SQL server 2000 and analyses it's traits to support the distributed database. Particularly, it expounds the exploiting methods, realizing process of multilayer distributed database, and the relative technologies , securities to realize distributed database.The thesis uses Delphi+ SQL Server2000 as platform , grounded on Delphi as the foreground application exploiting environment and SQL Server 2000 as background platform and exploiting environment. It is a preferable multilayer distributed systemic resolving project and has a more powerful function. Furthermore ,the choose of database also enlarge the capacity and it's ability of extension. The thesis provides systemic designation and exploiting method for the multilayer distributed database and builds a good model for the practical application. In the end , it is applied to the software designation of The Remote Check Meters system in terms of the basic theories and methods have been discussed.