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Query language approach based on the deductive object-oriented database paradigm

INFORMATION AND SOFTWARE TECHNOLOGY 2000年第11期42卷 777-792页

作者： Niemi, T Christensen, M Järvelin, K Univ Tampere Dept Comp & Informat Sci FIN-33014 Tampere Finland

The integration of data-oriented (structural), behavioral and deductive aspects is necessary in next generation information systems. The deductive object-oriented database paradigm offers a very promising starting point for the implementation of these kinds of information systems. So far in the context of this paradigm a big problem has been the lack of a query language suitable to an ordinary end user. Typically in existing proposals for deductive object-oriented databases the user has to master well both logic-based rule formulation and object-oriented programming. In this paper we introduce a set of high-level querying primitives which increases the degree of declarativeness compared to the deductive object-oriented query languages proposed so far. In terms of these primitives it is possible to offer for end users such application-specific concepts and structures whose interpretation is obvious to users but whose specification is too demanding for them. By combining these primitives in queries the user can integrate data-oriented, behavioral and deductive aspects with each other in a concept-oriented way. Our query language approach is based on the incorporation of deductive aspects to object-orientation. Among others this means that deductive aspects of objects are inherited in the specialization/generalization hierarchy like any other properties of objects. (C) 2000 Elsevier Science B.V. All rights reserved.

关键词： deductive object-oriented databases query languages query formulation integration of deductive and object-oriented aspects

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