【摘要】 提出一种将分布式数据库数据映射为符合用户要求的XML文档的描述语言——R2XL,在此基础上给出基于XML的分布式数据库集成系统,实现分布式数据库的透明访问和联合查询。对该系统中的查询处理、分布式数据库中的数据分片方法及相应的集成策略等关键问题进行了探讨。更多还原

【Abstract】 A describing language,R2XL(Relational To XML Language),is presented to express mappings of distributed database data into XML that conforms to user’s need.On the basis of this analysis,a system of integrating distributed database is proposed based on XML to achieve transparent access and unified query.The key questions are researched which include query processing,splitting method of distributed database data and the corresponding method to integrate these data fragments etc.更多还原