July 2011
Intermediate to advanced
450 pages
11h 38m
French
Content preview from Programmer avec MySQL
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Chapitre 5
Contrôle des données
Comme dans tout système multi-utilisateur, l’usager d’un SGBD doit être identifié avant de pouvoir utiliser des ressources. Les accès aux informations et à la base de données doivent être contrôlés à des fins de sécurité et de cohérence. La figure suivante illustre un groupe d’utilisateurs dans lequel existe une classification entre ceux qui peuvent consulter, mettre à jour, supprimer des enregistrements, voire les tables.
Figure 5-1 Conséquences de l’aspect multi-utilisateur
Nous verrons dans cette section les aspects du langage SQL qui concernent le contrôle des données et des accès. Nous étudierons :
• la gestion ...
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