在结构化分析中,用数据流图描述(请作答此空)。当采用数据流图对银行客户关系管理进行分析时,( )是一个加工。
- A.数据对象之间的关系,用于对数据建模
- B.数据在系统中如何被传送或变换,以及如何对数据流进行变换
- C.系统对外部事件如何响应,如何动作,用于对行为建模
- D.系统中的数据对象和控制信息的特性
正确答案及解析
正确答案
解析
数据流图(Data Flow Diagram,DFD):是一种最常用的结构化分析工具,从数椐传递和加工的角度,以图形的方式刻画系统内数据的运动情况。DFD摆脱了系统的物理内容,精确地在逻辑上描述系统的功能、输入、输出和数椐存储等,是系统逻辑模型的重要组部分。加工:描述了输入数据流到输出数据流之间的变换,也就是输入数据流经过什么处理后变成了输出数据流。
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