摘要： 给出了一种分布式异构数据源集成查询系统的设计与开发。能够实现对关系型数据库、文本文件和XML文档等不同数据源的透明存 取。查询系统读取不同数据源的数据字典,通过模式管理器建立起集成模式。用户通过查询处理器建立基于集成模式的查询,系统根据连接 信息和配置信息把对集成模式的查询分解成对每个数据源的子查询。各个数据源的查询结果返回后要被合并处理,再呈现给用户,实现了对 异构数据源的有效查询。

关键词: 异构数据源, 模式集成, 查询处理

Abstract: This paper presents a design and development of a query system for distributed heterogeneous data sources. The query system can formulate an effective query over relational databases, text files, and XML documents. Through the schema manager, the query system creates an integrated schema after reading the data dictionaries of the various data sources. Query manager can break down a query, which is generated over the integrated schema by users, based on the connection and configuration information of system and dispatch them to the individual data sources. The results form different data sources will be returned and merged, then present them to users in a view. The system can perform queries over heterogeneous data sources effectively.

中图分类号: 

• TP311.52