文档介绍：: .
........................12
数据库关系模型 ................................................................................................................................12
3. 系统物理实现 ............................................................................................................................................13
4. 系统部署 ....................................................................................................................................................14
5. 系统其它考虑 ............................................................................................................................................14
系统可扩展性 ....................................................................................................................................14
系统可靠性 ........................................................................................................................................14
系统性能 ............................................................................................................................................15
系统维护性 ........................................................................................................................................15
系统安全 ............................................................................................................................................15
系统异常处理 ....................................................................................................................................15
6. 约束 ............................................................................................................................................................15
设计指南 .....................................................................................................................