【摘要】 为使得许多非计算机专业的用户,尤其是未接受过数据库编程语言训练的用户,能够独立操纵一个数据库系统,有效地解决工作、生活中的问题,我们研究并提供了一种空间数据库可视化查询语言CQL。借助该语言,用户可以直观、方便地操纵数据库系统或查询数据库信息。本文介绍了CQL语言的语素、语义、语法及语用的定义,同时给出了CQL编辑器、编译器和查询结果可视化的设计方法。更多还原

【Abstract】 We have studied and realized a spatial database query language CQL for the users who have not undergone the taining of database programming languages. Our aim is to make the users be able to control a DBS and the query database information visually and conveniently. This paper summarizes the CQL language, and introduces the definition of morpheme, semantics, syntax and pragmatics of CQL. Meanwhile, the paper gives the design method of CQL editors, compilers and visual inquiry results.更多还原