面向对象视图的视图更新问题研究

Eleventh Annual International Phoenix Conference on Computers and Communication [1992 Conference Proceedings] Pub Date : 1992-04-01 DOI:10.1109/PCCC.1992.200553

S. Urban, K. Chalmers

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引用次数: 8

摘要

研究了面向对象视图的视图更新问题。视图是使用对象代数形成的，该对象代数提供面向集合的方法来检索对象。视图被定义为包括一个内涵和一个扩展，其中通过修改查询内涵范围内的对象来更新视图的扩展。面向对象数据模型中固有的丰富语义约束集，加上语义建模概念的增强，有助于明确视图更新的效果。本研究的贡献在于开发了一种分析与视图内涵相关的语义约束的方法，以(1)识别可选的视图更新翻译和(2)识别潜在的更新副作用。该方法可用于帮助设计正确反映更新预期语义的视图更新操作。

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An investigation of the view update problem for object-oriented views

An investigation of the view update problem for object-oriented views is presented. Views are formed using an object algebra that provides a set-oriented approach to the retrieval of objects. A view is defined to include an intension and an extension, where the extension of a view is updated by modifying objects in the scope of the query intension. The rich set of semantic constraints inherent in an object-oriented data model, enhanced with semantic modeling concepts, helps to make the effects of view updates explicit. The contribution of this research is the development of an approach for analyzing semantic constraints associated with the view intension to (1) identify alternative view update translations and (2) identify potential update side effects. The approach can be used to help in the design of view update operations that correctly reflect the intended semantics of the update.<>

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Eleventh Annual International Phoenix Conference on Computers and Communication [1992 Conference Proceedings]

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