关键词: 数据集成, 模式映射, 关系代数, 本地视图映射, 全局视图映射

Abstract: Integrated mapping is one of the basic issues in data integration, while it still has some deficiencies such as low repetition reducing rate, lack of accuracy, etc. Based on the research of Global-As-View (GAV) and Local-As-View (LAV), two fundamental mapping modes of data integration, and the mode matching, in connection with the questions in integrated mapping like repetition reducing and the transformation between boolean element value and semantic value, the article extended the existing theory of relational algebra. A mapping program of source-objective mode was designed. In such a program, the object congregation and relation congregation of source mode were expanded, and then objective mode was to be obtained through processing the expanded mode with expanded relational algebra, and the specific derivation process during the operation was represented. The feasibility of the program is verified through illustrating examples.

Key words: data integration, schema mapping, relational-algebra, Local-As-View (LAV), Global-As-View(GAV)