By Narain Gehani, H. V. Jagadish, O. Shmueli (auth.), Nabil R. Adam, Bharat K. Bhargava (eds.)
Database administration is attracting broad curiosity in either educational and commercial contexts. New software parts resembling CAD/CAM, geographic info structures, and multimedia are rising. the desires of those program components are way more advanced than these of traditional company functions. the aim of this ebook is to compile a collection of present learn matters that addresses a extensive spectrum of themes regarding database platforms and purposes. The ebook is split into 4 elements: - object-oriented databases, - temporal/historical database structures, - question processing in database structures, - heterogeneity, interoperability, open method architectures, multimedia database systems.
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Additional resources for Advanced Database Systems
Sn such that si > sl > 82 > ... > sn > sj. 2, we have Super_user > Chief_accountant > Accountant > Employee. Objects The ORION authorization model considers the following objects as objects to be protected: databases, classes in the database, instances of classes and their components (attributes, values, and methods). , the set of instances of a class or the set of values of an attribute) as objects to be protected. In this way authorizations can be specified on the set of objects contained in a given object using the same access modes specified for the object itself, without the need of introducing further access modes.
According to many object-oriented languages, the model distinguishes between public and private methods. , end- users, application programs, other objects). That previous notion of public/private methods has been further refined by allowing methods to be defined public with respect to some other methods, of the same or different objects. The method is then considered private for all methods for which it has not been explicitly defined as public. In this way, it is possible to specify that some methods cannot be invoked directly by the users of the object but can be invoked during the execution of some other methods.
The set of methods for which a specific method is public is called the invocation scope of the 36 C H A P T E R 2. A C C E S S C O N T R O L S IN O 0 D A T A B A S E S Y S T E M S method. T h e m o d e l is b a s e d on a u t h o r i z a t i o n s for users to execute m e t h o d s on objects. A u t h o r i z a t i o n s specify, for each user, t h e set of m e t h o d s t h e user can invoke on which o b j e c t s . Therefore, a u t h o r i z a t i o n s have t h e form < o, u, m >, where o is an object, u is a user, m is a m e t h o d .