Internet-based Educational Resources Consistency Study

With the development of Communication Network Technology, it is overwhelming that selftauch-exam education organization provide teaching by the means of sharing education resources on network based on modern communication technology. Adopting middle-ware technology, the education resources is deeply worked over to find out how they can be used consistently. As CORBA is good at resolving the issue of distributed system, isomerization and extensibility so CORBA is adopted here for construction of distributed database access frame with a background of selftauch-exam education resources.First, introduce middle-ware technology with the points of: CORBA architecture, ORB core, POA ,other conceptions newly added in CORBA 3.0 specification, and introduce naming service theory .Second ,classify and analyse current system resources , issue that education resources are distributed storage, and databases are isomerization and diversification of hardware platform. On the based,give the definition of education resources uniform use,and some problems must be resoved in order to use education resources uniform and it is leaded to a uniform use education resources application frame with three layers.At the end, consideration of characteristic of selftauch-exam education, there is a detailed requirements analysis of created database system. With it, the target of selftauch-exam education resources database system analysis was make up, as well as database functionality module diagram and data flow diagram and database tables and datatypes mapping table; Client find in globe database is converted to finding in part database; Then is the disquisition of multimedia data processing and implementation of database connection through ODBC.Subsequently the disquisition adopts Visibroker ORB, which is CORBA compliant as middle-ware. There is detailed requirements analysis of whole system. And then on the basic of deep research of OMG IDL Specification, put forward througn improving interface performance then improving system performence and efficency, put forward innovatively new conceptions of a data types discriminator which provide a efficiency data transmission functionality of conversion between database data type and IDL data type; And construct a hierarchical naming context structure figure, a arithmetic of naming service,a resolving and a arithmetic of POA.Abase all, the Server application and Client application implementation was followed.