对象定义图及其向对象定义语言和关系模型的转化

Object definition diagram and its conversion to object definition language and relational model

依据对象定义语言(ODL)的思想,创建了一个面向对象建立数据库模型的图形工具———对象定义图(ODD).ODD具有直观、便于进行面向对象数据模型的设计等特点.利用ODD可方便地建立面向对象的数据库模型,也可以方便地将其转换为ODL模型或关系模型.

According to the theory of object definition language(ODL),object definition diagram or ODD,a pictorial tool,which is used to create object-oriented database model,is created(ODD).ODD has a good visualization and is easy to design object-oriented data model.Hence,ODD can be used to model databases conveniently and ODD models can be easily converted to ODL models and relational models.