超媒体数据库三层数据模型

提出了超媒体数据库应用的三层数据模型，并给出了使用ＤＢＨＭ方法设计的一个实例。ＤＢＨＭ模型由上至下包括表现层、逻辑层，存储层等三个层次，各自对应于导航模型，对象模型以及关系模型。

DBHM Hypermedia Database 3-Layer Data Model

This article described a 3 layer designing model (Named DBHM) for hypermedia database applications and illustrated the approach using a small application. The DBHM model from top to bottom includes representation layer, logic layer and storage layer, which correspond to navigation model, object model and relational model respectively. Firstly, object oriented analysis method is used to construct a model for the application. After completion of the object model, the basic architecture of the application is settled. Then the correspondent navigation model and relational model can be gained through certain mapping relation. So, navigation features are closely combined with database structure. Its objective is to use the DBHM approach as the basis for the construction of reliable data centric hypermedia applications.