查询重写过程中正则表达式的处理

随着数据库技术的发展,利用现有的关系数据库引擎来实现对XML查询的发布有着重要的研究意义.在XML查询中,如何有效实现正则路径表达式的转化是发布系统过程中需要解决的主要问题,针对该问题,提出一种有效的方法,引入析出路径表达式,完成了从正则路径表达式到SQL表达式之间的转换.最终实现由XQuery查询到SQL查询的查询重写.

Disponse of a regular path expression during the query rewriting

With the mature development of database technology,the problem of how to use the existing relational database engine to achieve the release of XML has important significance.In this paper,according to the main problem of how to convert the regular path expression to the system of publishing process,we present an effective method and introduce the concept of extract path expression,which achieves the transformation from the regular path expression to the expression of SQL.This method can achieve the query rewriting of XQuery to SQL query.