Object comprehensions: A query notation for object-oriented databases

Autor:	Daniel K. C. Chan, Philip W. Trinder
Rok vydání:	1994
Předmět:	Web search query Object Query Language Programming language Computer science View Query by Example Sargable Query optimization Query language computer.software_genre computer computer.programming_language RDF query language
Zdroj:	Directions in Databases ISBN: 9783540582359 BNCOD
Popis:	Existing object-oriented query notations have been criticised for being unclear, verbose, restrictive, and computationally weak. This paper introduces a new query notation, object comprehensions, that allows queries to be expressed clearly, concisely, and processed efficiently. Object comprehensions are designed for object-oriented databases and include features that are missing from or inadequate in existing object-oriented query languages. Novel features include: a predicate-based optimisable sub-language providing support for the class hierarchy; numerical quantifiers for dealing with occurrences of collection elements; operations addressing collection elements by position and order; a high-level support for interaction between different collection kinds; and recursive queries with computation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ee8e764d23a2f69975982d267e9ad355 https://doi.org/10.1007/3-540-58235-5_35 Zobrazit plný text záznamu