支持全文检索的XQuery查询处理及优化的研究

Study on the Query Processing and Optimization of XQuery with Full-Text Search

XQuery作为由W3C组织提出的一种XML查询语言,正在成为当前应用于XML数据库中对XML数据操作的一个规范。为了提高对XML中文本内容的查询支持,W3C又进一步设计了支持全文检索功能的语法规范。针对最新的XQuery及全文检索语法特征,文章提出了支持全文检索功能XQuery的解析与查询执行策略,为XQuery的查询处理提供解决方案。在此基础上,针对全文检索功能的查询执行计划,提出了适用于窗口查询,距离查询,是否排序查询的优化方案,以减少查询执行的代价,提高XQuery查询的效率。

AS the query language for XML,designed by W3C,XQuery is becoming the standard query language on current application and querying XML data in the XML DataBase. The XQuery with full-text has been designed to satisfy the need for search the content of XML.For the latest features of XQuery and full-text search syntax, the paper presents the XQuery full-text search query compilation and execution strategy.On this basis,this paper presents some optimization approaches which can be used in window query,distance query,ordered query to reduce the query costs and improve the efficiency of XQuery to the full-text plan.