對象/關系映射中的完整性及關系約束檢查

【摘要】針對面向?qū)ο笤O計與關系數(shù)據(jù)庫設計之間的不匹配問題，介紹了一種映射方法O/R Mapping。在使用對象模型時，常常通過對象之間的關系來進行訪問；而根據(jù)關系理論，則通過表的連接、行列的復制來實施數(shù)據(jù)的存取。其不同使兩種機制的結合并不理想，當為訪問數(shù)據(jù)尋找一種合適的方法時，則不匹配就成為了主要矛盾。使用對象/關系映射可以解決該矛盾。
關 鍵 詞 對象/關系映射; 對象; 關聯(lián); 完整性及關系約束

There are two ways of using object model.One way is, generally, accessing object model by the relation of the object, another way is , according to Relation theory, accessing or saving data by connecting tables or copying columns or rows. As the basal difference mentioned above,the integrate of two function is far from perfect. It is not match between OO design and relation data base design.So we need a mapping method——O/R Mapping to solve the inconsistency to get a successful design.