Definition of derived classes in OODBs

Author

Samos, José ; Saltor, Fèlix ; Sistac, Jaume

Author_Institution

Dept. de Llenguatges i Sistemes Inf., Univ. Politecnica de Catalunya, Barcelona, Spain

fYear

1998

fDate

8-10 Jul 1998

Firstpage

150

Lastpage

158

Abstract

According to the ANSI/SPARC architecture, external schemas are derived from the database conceptual schema. In object-oriented databases (OODBs), an external schema map include classes defined in the conceptual schema just as it may also contain derived classes which are directly or indirectly defined on the basis of conceptual schema classes. In the definition of derived classes in OODBs three main issues have to be resolved, namely: the integration of derived classes with other classes in an object schema; the definition of classes with new objects; and the transmission of modifications between the objects in derived classes and those of the classes from which they are defined. A solution to the first issue was proposed by Samos (1998). In this paper, the two remaining issues are further studied and new conceptual level solutions are put forward. Our proposals are informally illustrated through some examples

Keywords

abstract data types; object-oriented databases; ANSI/SPARC architecture; conceptual level solutions; conceptual schema; database conceptual schema; derived classes; external schemas; object-oriented databases; Dictionaries; Electrical capacitance tomography; Object oriented databases; Object oriented modeling; Proposals; Relational databases;

fLanguage

English

Publisher

ieee

Conference_Titel

Database Engineering and Applications Symposium, 1998. Proceedings. IDEAS'98. International

Conference_Location

Cardiff

ISSN

1098-8068

Print_ISBN

0-8186-8307-4

Type

conf

DOI

10.1109/IDEAS.1998.694375

Filename

694375