基于有向图的数据流图的 E-R 模型构建方法

摘要

Establishing conceptual model is one of the important steps of database design , E-R model is a conceptual model wide-ly used in database design .This paper proposes the use of business analysis process of the formation of the data flow diagram , da-ta flow diagram is a directed graph abstraction to construct methods E-R model .In large systems , database design process , using this method can quickly build E-R model topical application , greatly reduce the design process to build a database E-R model time-consuming.In addition, the paper also gives an example to verify , illustrates the practicality and effectiveness of this method in practical engineering projects .%建立概念模型是数据库设计的重要步骤之一，E-R模型是数据库设计中广泛采用的概念模型。本文提出利用业务分析过程中形成的数据流图，把数据流图抽象为有向图，从而构建E-R模型的方法。在大型系统数据库设计过程中，使用这一方法可以快速构建局部应用的E-R模型，大大缩短数据库设计过程中构建E-R模型所耗费的时间。实例验证了本方法在实际工程项目中的实用性和有效性。