By Elisa Bertino
ISBN-10: 0201624397
ISBN-13: 9780201624397
Object-Oriented Database platforms deals a transparent advent to the techniques and lines of object-oriented database, illustrated with numerous examples of present advertisement structures. expert database designers and clients who need a transparent advisor to the present cutting-edge will locate this e-book a needs to.
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Example text
The second approach is based on not providing an explicit delete operation. A persistent object is cancelled only if all external names and references associated with it are removed. This ensures integrity of references. Metaclasses As mentioned earlier it is useful to consider each class in turn as an object in itself, that is as a class-object, in which the attributes and methods common to the instances of that class are gathered together and in which those features of that class are stored that cannot be considered as features of the instances, for example the number of instances of the class present at any given time in the database or the mean value of an attribute evaluated on all instances of the class.
In terms of expressive power the objectoriented data model is less powerful than the semantic data model but the latter lacks the concept of methods. For reasons of performance and ease of use, the core of the object-oriented model must be extended to include functions such as versions or composite objects (Kim, 1990). Generally speaking, the fundamental difference between these two types of data model is that the semantic models provide mechanisms for structural abstraction and in this sense are similar to knowledge representation models.
The Obj ect class is the root of the inheritance hierarchy and therefore each class is its subclass. When one wants to define a new class, this has to be defined as a sub-class of a class which is already present in the database. If the new class is a specialization of a previously defined class, the choice of superclass is natural, otherwise the user must determine, from among the kernel classes, the class whose characteristics are most suited to the new class. If no class is suitable, then the new class must be defined as a subclass of Object.
Object- Oriented Database Systems: Concepts and Architectures by Elisa Bertino
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