一种在面向对象查询中支持方法调用的方法

[1992 Proceedings] Second International Workshop on Research Issues on Data Engineering: Transaction and Query Processing Pub Date : 1992-02-02 DOI:10.1109/RIDE.1992.227410

E. Bertino, A. Quarati

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引用次数: 11

摘要

提出了一种支持方法上查询谓词的高效求值的索引技术。该技术是基于方法结果的预计算。预先计算的结果存储在一个索引中，该索引与结果(方法执行返回的对象标识符列表)相关联。对方法结果的谓词求值只需进行索引搜索。建议的组织跟踪可能影响方法调用结果的更改。此机制用于使方法的预先计算结果无效。该方法在下次调用时再次被重新计算。

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An approach to support method invocations in object-oriented queries

An indexing technique is presented supporting an efficient evaluation of query predicates on methods. The technique is based on the precomputation of method results. The precomputed results are stored in an index that associates with a result v the list of object identifiers for which the method execution returns v. The evaluation of a predicate on the results of a method simply requires an index search. The proposed organization keeps track of changes that may influence the results of a method invocation. This mechanism is used to invalidate the precomputed results of a method. The method is recomputed again upon next invocation.<>

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[1992 Proceedings] Second International Workshop on Research Issues on Data Engineering: Transaction and Query Processing

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