文档介绍：目录学生管理系统........................................................................................................................3第一章需求分析阶段......................................................................................................3一、图书馆组织结构:.................................................................................................:.........................................................................................................:.........................................................................................:DFD.......................................................................................................:.........................................................................................:.........................................................................................................7第二章数据库设计阶段................................................................................................:.........................................................................................................:.....................................................................................................:...............................................................................................11第三章概念结构设计:..............................................................................................141、系统E—R设计:...................................................................................................142、实体图.....................................................................................................................15第四章POWERDESIGNER的概念模型和物理模型..........................................................171、概念模型.................................................................................................................172、物理模型为:.........................................................................................................18第五章