摘要
分析了一般数据库的查询模型，提出基于集合构造的幂集查询模型，基于数据模型的特点定义了能评价查询模型强弱的查询能力，据此讨论了幂集查询模型的能力及其特点。
An elementary query model is a key factor to implement spatial information query in GIS. A common query model in database is outlined in this paper and a powerset query mode is put forward based on construction of set. In regard to data models, a query capacity is defined for assessment of query models. The powerset based query model is examined according to the capacity.
出处
《武汉测绘科技大学学报》
CSCD
1998年第4期374-376,共3页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金
