A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system, modelling its process aspects. A DFD is often used as a preliminary step to create an overview of the system, which can later be elaborated. DFDs can also be used for the visuali...
描述一个输入源点或输出汇点.其中注明源点或汇点的名称. 描述一个数据流.被加工的数据及其流向.流线上注明数据名称,箭头代表数据流动方向. 描述一个数据存储.通常用于代表一个数据表,其中注明数据表的名称. 二,分层数据流图 为了表达数据处理过程的数据加工情况,用一个数据流图往往是不够的.稍为复杂的实际问题,...
没有注册,电子邮件地址或义务是必需的。 如何绘制 Context Diagram 级DFD? 要创建新的DFD,请从工具栏中选择图表>新建。 在New Diagram窗口中,选择Data Flow Diagram,然后单击Next。 输入上下文作为图表名称,然后单击确定确认。 我们现在将绘制第一个过程。从图表工具栏,将过程拖到图上。命名新的进程系统。 接下来,...
Data flow diagram, also often referred to as DFD are diagrams that visually represent the flow of data through a system. They allow the user to see what kind of information will be input to and output from the system and where the data will be stored. What are data flow diagrams used...
DFD, Data Flow Diagram. 它表示系统如何处理数据并描述数据的来源、去向以及数据的存储方式 如图: 1.2 DFD的组成 Process– Transforms incoming data flow into the outgoing data flow 输入数据流转化为输出数据流 Data Store– Represents the repositories of data in the system数据存储库 ...
Context Diagram. A context diagram is a top level (also known as "Level 0") data flow diagram. It only contains one process node ("Process 0") that generalizes the function of the entire system in relationship to external entities.
数据流图(Data Flow Diagram):简称 DFD,它从数据传递和加工角度,以图形方式来表达系统的逻辑功能、数据在系统内部的逻辑流向和逻辑变换过程,是结构化系统分析方法的主要表达工具及用于表示软件模型的一种图示方法。 组成元素与基本构成: □:形如矩形,或者长方体,数据源或宿(“宿”表示数据的终点)。代表系统之外的...
For the same data model rendered somewhat differently, see theData Flow (vertical)sample. SaveLoadDiagram Model saved in JSON format: { "class": "go.GraphLinksModel", "nodeCategoryProperty": "type", "linkFromPortIdProperty": "frompid", "linkToPortIdProperty": "topid", "nodeDataArray":...
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Level 0 diagram: A more detailed version of the context diagram, it provides a more granular view of the data flow within the marketing system, allowing stakeholders to also understand the interactions and dependencies between different processes. ...