区间约束数据库查询语言:ISQL  

ISQL:AN INTERVAL CONSTRAINT DATABASE QUERY LANGUAGE

作　　者：陈良刚[1] 徐贵红[1] 王宇君[1] 施伯乐[1] 

机构地区：[1]复旦大学计算机科学系,上海200433

出　　处：《计算机研究与发展》2000年第6期677-683,共7页Journal of Computer Research and Development

基　　金：国家自然科学基金!69773012

摘　　要：区间约束数据库可以统一处理空间和非空间数据，它基于关系数据库，增加了对区间约束数据的支持．为了管理区间约束数据，在这个模型基础上，提出了一个区间约束数据库语言ISQL．ISQL完全保留了数据库中非空间数据的SQL查询能力，同时集成了对空间数据的管理．定义了ISQL的语法和语义，它扩充了SQL2的语法和语义，增加了对区间约束数据的查询．通过嵌套查询、并差查询、插入、删除、更新等情形，给出了相应的实例和说明．最后讨论了ISQL语言的封闭性．An interval constraint database provides a uniform framework for handling spatial and non-spatial data. It is based on relational databases while supporting interval constraint data. In order to manage interval constraint data, an interval constraint database query language ISQL is proposed based on this model. ISQL provides the full query capabilities of SQL on the non-spatial part of the database while being tightly integrated with the spatial part. The syntax and semantics of ISQL is defined and an extension of SQL2 is proposed for the management of interval constraint data. Its specification and examples by queries are given by means of union and except, data insertion, deletion, update, etc. based on the interval constraint data model.Finally, the closure property for ISQL is discussed.

关 键 词：数据库查询 约束数据库 关系数据库 ISQL语言 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]