Towards a Flexible Database Interrogation

Towards a Flexible Database Interrogation

In this paper, we are interested in the use of domain ontologies as a semantic enrichment for traditional databases. Our first aim is to help the user in his search when his initial query doesn’t return any result. So, we propose a solution based on two different approaches allowing the user to express his interrogation in a relatively free way. The first approach detects and resolves naming an...

Towards a Flexible and Transparent Database Evolution

Applications refactorings that imply the schema evolution are common activities in programming practices. Although modern objectoriented databases provide transparent schema evolution mechanisms, those refactorings continue to be time consuming tasks for programmers. In this paper we address this problem with a novel approach based on aspect-oriented programming and orthogonal persistence parad...

Database Interrogation Using Conjunctive Queries

A Flexible Database Authorization System

In this paper we present an authorization mechanism for a relational database. It allows defining the user privileges exact to a table row. To implement that we used the INSTEAD triggers installed on views. This authorization system is an interesting application of such triggers. The user privileges are organized into parameterized roles that can be instantiated and/or inherited by other roles.

Interrogation flexible et coopérative d'une BD par abstraction conceptuelle hiérarchique

RÉSUMÉ. L' interrogation des bases de données (BD) nécessite une connaissance précise et détaillée des données et de leur organisation. L’interrogation flexible tente de rendre l’interrogation classiques des BD plus souple pour les utilisateurs. Plusieurs approches d’interrogation flexible ont été proposées dans la littérature. Nous proposons, dans ce papier, une approche flexible et coopérativ...