From time to time, the demands of changing business needs require that you add new entities and relationships to the relational data models or object-oriented models.
变化的业务需求不断地要求向关系数据模型或面向对象模型中添加新实体和关系。
IT systems organize meanings using relational data models, flat files, object-oriented models, or proprietary data models.
IT系统使用关系数据模型、大文件、面向对象模型和私有数据模型来对意义进行组织。
Compared with several other data models used in early and recent GIS, the author gives his own idea of what is a geographical space, and then puts forward a new object-oriented conceptual data model.
本文在分析和总结了早期和近期GIS几种数据模型的优缺点的基础上，对地理空间进行了重新理解，给出了一个面向对象的概念数据模型。
应用推荐