Research On Technology Of Data Integration In Distance Education Evaluation System

Along with the fast development of the information technology and the constantly widening of application field, database system gradually enters various domains. Owing to the fact that the trunk stream technology of database system is changing continuously, the database products of various periods exists simultaneity. To use these database products jointly, the concept of Data Integration is advanced.Nowadays the popular method for Data integration is to adopt XML technology, which needs to solve various problems such as the different structures, the conflict semantic meaning, the integrality and so on. There is great difference between the data structure of XML and the data storage structure of database, and XML technology is not only unripe, but also discommodiousness. In view of these cases, according to the demand of the Data Integration in Distance Education Evaluation System, this paper puts forward a scheme which combines data dictionary with MWP protocol. MWP protocol is an application layer protocol designed by the paper. In this paper the semantic, syntax and temporal order of the MWP protocol are stipulated, and the slide window protocol and congestion control algorithm are planed to ensure the reliability of data transmission. The data dictionary, which contains correspondence of the whole data model and the local data model in the overall data integrated system, is equal to the map of the whole data integrated system. The scheme has been realized in Distance Education Evaluation System, and the testing has proved that this scheme is feasible and high efficiency.This data integrated settlement scheme which is designed simply and can be easily popularized .Therefore it will be applicable to most data integration cases in our country, and has some reference meaning to the study in the field of Data Integration.