面向对象数据库联合中的查询修改

Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI:10.1109/COOPIS.1997.613816

Mark W. W. Vermeer, P. Apers

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引用次数: 2

摘要

我们讨论了在面向对象数据库联盟中针对集成视图的查询的修改。我们提出了一种用于简单全局查询处理的现有算法的泛化，该算法适用于任意定义的集成类。然后我们扩展这个算法来处理面向对象的特性，比如涉及路径表达式和嵌套的查询。我们展示了如何利用通过对象引用建模关系的oo风格的属性来减少评估此类查询所需的子查询的数量。

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Query modification in object-oriented database federations

We discuss the modification of queries against an integrated view in a federation of object-oriented databases. We present a generalisation of existing algorithms for simple global query processing that works for arbitrarily defined integration classes. We then extend this algorithm to deal with object-oriented features such as queries involving path expressions and nesting. We show how properties of the OO-style of modelling relationships through object references can be exploited to reduce the number of subqueries necessary to evaluate such queries.

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Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems

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