【摘要】 针对目前大量的Web数据源不易使用及虚拟数据库中查询信息响应不及时的情况,本文阐述了构造一个虚拟数据库中间件的方法,采用XML为数据交换模式,以XQuery为查询语言,使得Web数据容易被访问,并且通过缓存系统和多线程机制提高查询效率。更多还原

【Abstract】 At present,there are a lot of data sources in internet and the response time of querying information is not very good in virtual database system.This article discusses a method to construct virtual database middleware.We use XML as data exchanging pattern,XQuery as query language.This makes it easy to access the web data.A cache system and an asynchronous multi-thread mechanism are useful to query.更多还原