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Inheritance and Persistence in Database Programming Languages

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Original languageEnglish
Title of host publicationSIGMOD '86 Proceedings of the 1986 ACM SIGMOD international conference on Management of data
PublisherACM Press
Pages4-15
Number of pages11
ISBN (Print)0-89791-191-1
DOIs
Publication statusPublished - 1 May 1986

Abstract

In order to represent inheritance, several recent designs for database programming languages have made use of class construct, which can be thought of as a restricted data type with an associated set of instances. Moreover, these classes are persistent they survive from one program invocation to another. This paper examines whether it is necessary to the together type, extent and persistence in order to model inheritance and suggests that they may be separated to provide more general database programming languages. In particular we shall see that it is possible to assign a generic data type to a function that extracts all the objects of a given type in the database so that the class hierarchy can be derived from the type hierarchy. We shall also examine object-level inheritance and its relationship to data types for relational databases. A final section examines how the various forms of persistence interact with inheritance at both object and type level.

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