摘要
针对利用文件存储的GIS系统不能自动实现查询这一问题,结合SQL-99标准和GIS软件MAPGIS定义的语法规则,运用编译原理中的词法分析、语法分析等理论,实现了将用户输入的普通查询表达式解释为一个标准的SQL语句,并输出查询结果。该SQL解析器已经成功地运用在MAPGIS文件管理的属性检索模块中。
Aiming at the problem that file stored GIS system couldn＇t implement query automatically, combining SQL-99 standards and syntax rules which are defined in GIS sol, ware, MAPGIS, applying theory oflexical analysis and syntactical analysis implements the function of translating query expression which is input by users to a standard SQL sentence and outputs results. The SQL interpreter has already been used in attribute query model of file managed MAPGIS software.
出处
《计算机工程与设计》
CSCD
北大核心
2006年第2期211-213,共3页
Computer Engineering and Design
基金
国家863高技术研究发展基金项目(2003AA133010)
