| 摘要: |
| 在采用面向对象模型作为公共数据模型的多数据库系统中，基于模式集成语义的查询处理不仅要实现针对集成模式查询到针对输出模式查询的转换，而且要从语义上尽可能减少回答用户查询所需数据，保证对象引用的正确性.为了达到这个目标,提出了一些新的概念及基于模式集成语义的查询处理规则和路径表达式的查询处理方法. |
| 关键词: 数据库,多数据库系统,查询处理,面向对象. |
| DOI： |
| 分类号: |
| 基金项目:本文研究得到国家863高科技项目基金资助. |
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| Query Processing on Schema Integration Semantics |
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SHI Xiang-bin,ZHANG Bin,YU Ge,ZHENG Huai-yuan
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| Abstract: |
| In a multidatabase system with an object-oriented data model as a common data model, query processing on schema integration semantics should not only implement the translation from a query against integrated schema to queries against export schema, but also reduce the datum used for answering for user's query as more as possible and ensure the correctness of object reference in semantics. To achieve this object, in this paper, the authors present some new concepts, query processing rules and query processing methods for path expression on schema integration semantics. |
| Key words: Database, multitatabase system, query processing, object-orientation. |
