Research Of Contract Management System Based On Corba

The web technology delegated by Internet has an important influence on the enterprise development, so it is much more urgent for enterprise to undertake MIS. And the Contract Management System which is the most important part must also conform to such development direction. Contract Management is the beginning of the design progress management, and the design progress must rely on the contract context; at the same time, contract management is the ending of the design progress. When the project is over, all the message should be used to embody the contract. Contract Management System runs through the whole progress. Contract Management System based on web has great meanings. For example, it can reduce the put-off, time and charge, it can also improve the efficiency. With the popularization of computer, it is possible to realize the no-paper office work. Before we introduce the whole system, firstly we introduced what contract is, what contract management is and the international developing trend of contract management system. With the development of computer technology, the contract management also need to be informational. Under this background, the ninth mechanical design academy demand to make the contract manage criterion. The information sources of the enterprise show the structure of heterogeneity, distribution, loosing and coupling. With the perfection of the distribution of enterprise, the demand of contract information and c/s system structure and distributive processing technology, contract management system goes to a completely new phase, and the system structure changed from integrative process control to distributed structure that supports the management of the enterprise or inter-management between enterprises based on distributed compute technology. This system absorbs the advantage of integrative structure and distributed structure, completes the contract management system. It meets the ninth mechanical design academy and resolves the problem according to the fact of this academy. It not only ensures to complete the modern contract manage, but also has the characters of the ninth academy. CORBA, the whole name is Common Object Request Broker Architecture. It was made by OMG (Object Management Group) of USA. The aim is to let the application programs on different platform can link up each other and run. CORBA allows application program to call the others without knowing on which service the called one locates . It has the trait of span_platform. In the other side, whatever programming language is used to develop object, the object can be called after being packaged by interface defined by CORBA IDL. So we will not be forbidden by programming language through this CORBA middle component.Therefore, CORBA is a mature criterion, many productions which support it can be chosen. Among them, VisiBroker is the first ORB which supports clients and object completion (that is, both client and object adopt the same middle software), VisiBroker accords with CORBA2.0 criterion, supports span-platform and multi operation system, in-build IIOP engine. At the same time, it completed the basic services of CORBA such as transaction service, naming service and event service, it also can complete SSL protocol and IIOP encrypt transfer. Besides, it offers interface base manage implement. In our system, we adopt the C++Builder VisiBroker of Borland as the CORBA bottom support platform by using the platform to mask the differences of heterogeneous condition and turn client application systems to disparate CORBA objects, difference object communicate by VisiBroker , by adopting the form of CORBA object and request and respond to cooperate with each other to achieve responding work.In the forth section of this thesis, we present the whole frame and system logical structure of contract management system based on CORBA. The system is a distributed contract management system supported by CORBA technology and database system. This kind of distributed multi structure divides the r...