| 摘要: |
| 本文提出了一个从关系数据库到面向对象语义数据库的两段模式转换方法。该方法是以语义确认为基础的．包含在局部关系模式中的语义可分为2类：一类是关系内语义，它是包含在一个局部关系模式内的语义;另一类是关系间语义，它是包含在局部关系模式之间的语义．第1阶段主要是将关系内语义捕捉到全局集成模式中来；而第2阶段则将关系间语义通过模式重构操作添加到全局集成模式中来．本文定义了一套用于建立转换机制的映射规则和转换操作．设计并实现了用于产生G关系的算法和一系列转换公式． |
| 关键词: 语义捕捉，模式集成，模式映射，查询翻译． |
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| 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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| SEMANTIC CAPTURE AND SCHEMA TRANSFORMATION FROM RELATIONAL DATABASES INTO OBJECT—ORIENTED SEMANTIC DATABASES |
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Wang Guoren,Yu Ge,Shi Jing,Shan Jidi,Zheng Huaiyuan
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| Abstract: |
| This paper presents a 2—phase schema transformation method for schema transformation from relational databases into object—oriented semantic databases．The method is based on the semantics identmcation．The semantics included in local relation schemas can be divided into two parts：one are intra—relation semantics existing within local relations and the others are inter— relation semantics existing among local relations．All intra—relation semantics are captured into the global integration schema in phase l，and all inter—r elation semantics are enriched into the global integration schema by schema reconstruction operations in phase 2．The mapping rules and transformation operations are defined for setting up the transformation mechanism，and a set of algorithms and transfor mation formulations are provided for generating G—relations． |
| Key words: Semantic capture,schema integration,schema mapping,query translation． |
