数据访问层设计方法地研究.pdf

Abstract Abstract Sincethe of informationis integrationenterprise systemstronglyrequired by many and database must companies，multi—database applicationmigrationapplication be the ofdatabaseaccess isalso solved，and improvement layer’Sdesign necessarN is which an into research field．Thisdissertation becomingimportant introducestwo database modelsof access arebasedon design layer,which object—orientedanalysis and first isthe one model accessbaseon layer-structure．The design o／’databaselayer anotheristhe modeldatabaseaccess object—orientedanalysis，and design of layer baseonseal acode andaclass to operation．We ofdatabase providegenerator library two models first onehasbeen on design the support respectively．The performed One—Cd倒networkservices enhancesthe project“Campus informationsubsystem”．It and the ofthe efficiencyofdevelopment improvesextensibitity subsystem． This dissertationis as