酒店管理系统2015-11-101引言...............................................................................................................................................21.1编写目的................................................................................................................................21.2背景.......................................................................................................................................21.3定义.......................................................................................................................................31.4参考资料................................................................................................................................32任务概述.......................................................................................................................................42.1目标.......................................................................................................................................42.2用户的特点............................................................................................................................42.3假定和约束............................................................................................................................53需求说明.......................................................................................................................................63.1对功能的规定........................................................................................................................63.2总体E-R图...........................................................................................................................83.3各实体E-R图........................................................................................................................93.4数据字典.............................................................................................................................133.4DFD图.................................................................................................................................183.5用例及其描述......................................................................................................................204概要设计.....................................................................................................................................434.1概念模型设计......................................................................................................................434.2物理模型设计......................................................................................................................434.3对SQL进行优化...................................................................................................................444.4验证SQL创建的数据是否有误...........................................................................................495附录.............................................................................................................................................555.1对性能的规定......................................................................................................................555.1.1精度............................................................................................................
