Assisted Teaching System Based On C / S Model Design And Realization

For the present, Basing on the computer aided instruction system of Internet's terrace development, and has become one kind of new and developing teaching medium, it surmount the unfavorable factor that student lack of use computer's time and fall short of teacher resources etc, in addition,student can arrange intimate study time according to the real circumstances of oneself and shared excellent education resources and the education method.This paper mainly gives account of method and technology of realizing distributed application system basing on three tier client/server; then narrates the method of developing multi-tiers application by Delphi's MIDAS; finally, introduces designation and realization of assistant teaching system basing on Us pattern, anddiscusses in detail key technology of this system.Assistant teaching system basing on Us pattern includes three subsystem: homework system on the net,answer system on the net and examination system on the net. Client/Server system basing on three tiers divides system into browser logical, application logical, data logical to make the system high performance high safety. System backstage database adopts SQL Server2000,Delphi to develop the tool as the proscenium application, and the intermediate strata adopt ODBC to link with the data base. TSimpleObjectBroker of MIDAS in Delphi is adopts to improve fault-tolerance and load balancing of this system.