摘要
介绍了 4层元模型原理 ,分析了基于元模型的应用开发的特点 ,在此基础上提出了基于元模型的数据库查询方法 .该方法是通过描述信息系统的数据流动过程中数据模型的变换 ,完成数据的转换 ,数据查询就是数据从存储模式向用户模式的转换 .给出了数据词典和查询定义 2个元模型 。
This paper introduces the four layer metamodel theories and analyzes the characteristics of application based on metamodel, we put forward a method of query RDB based on metamodel. The main concept of the method is that the data conversion is completed by describing the conversion of data model in the process of data flow of information system. Data query is that the data are transferred from store mode to user mode. The two metamodels introduced in this paper are data dictionary and query definition. This method of query have been applied in several MIS.
出处
《大庆石油学院学报》
CAS
北大核心
2004年第2期69-71,共3页
Journal of Daqing Petroleum Institute
