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to appear in the Journal of Systems Integration, Vol.4 No.4, 1994, Kluwer Academic Publisher. Integrating Relational and Object-Oriented
 

Summary: to appear in the Journal of Systems Integration, Vol.4 No.4, 1994, Kluwer Academic Publisher.
Integrating Relational and Object-Oriented
Database Systems using a Metaclass Concept
Wolfgang Klas, Gisela Fischer, Karl Aberer
GMD­IPSI, Darmstadt
{klas, maus, aberer}@darmstadt.gmd.de
Abstract
This paper presents a specific approach of integrating a relational database system into a federated database
system. The underlying database integration process consist of three steps: first, the external database systems
have to be connected to the integrated database system environment and the external data models have to be
mapped into a canonical data model. This step is often called syntactic transformation including structural
enrichment and leads to component schemas for each external DBMS. Second, the resulting schemas from the
first step are used to construct export schemas which are then integrated into global, individual schemas or
views, in the third step. In this paper we focus on the first step for relational databases, i.e., the connection of a
relational database system and the mapping of the relational model into a canonical data model. We take
POSTGRES as the relational database system and the object-oriented federated database system VODAK as
the integration platform which provides the open, object-oriented data model as the canonical data model for
the integration. We show different variations of mapping the relational model. By exploiting the metaclass
concept provided by VML, the modelling language of VODAK, we show how to tailor VML such that the
canonical data model meets the requirements of integrating POSTGRES into the global database system VO-

  

Source: Aberer, Karl - Faculté Informatique et Communications, Ecole Polytechnique Fédérale de Lausanne

 

Collections: Computer Technologies and Information Sciences