By Elisa Bertino
Object-Oriented Database structures deals a transparent advent to the innovations and lines of object-oriented database, illustrated with numerous examples of present advertisement structures. specialist database designers and clients who desire a transparent consultant to the present cutting-edge will locate this ebook a needs to.
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Additional info for Object- Oriented Database Systems: Concepts and Architectures
If the object is a person, one wants the data concerning it, like name, salary, and so on, to be displayed. If, on the other hand, it is a graph, one wants a graphic representation. A further problem arises with the display of a set, the type of members of which is not known at compile-time. In an application using a conventional system, there would be three operations - display-graph, display-person and display-figure. This forces the programmer to be aware of all the possible types of objects, of all the associated display operations, and, consequently, to use them properly.
Both support some form of data nesting, in that they accept objects which refer to other objects such as values of their attributes. But there is a fundamental difference. The aggregation hierarchy in a database schema can contain cycles. By contrast, the modelling of cyclic objects in the network data model requires artificial structures to be introduced in the schema. A second similarity can be perceived between object identifiers and the use of pointers in the network model. An object identifier is however a logical pointer and, in addition, there are many systems where an identifier is never reused, even if the object is cancelled, whereas a pointer to a record is a physical pointer and cannot, therefore, be used for checking referential integrity.
As discussed in Albano et al. (1991) and Rumbaugh (1987), there are a number of disadvantages to representing associations by means of references between objects. 4 Empl,oyer company-nan ne:STRING soc security_ no:STRING address:STRI NG Representation of a binary association. 5 Representation of a ternary association. 6 Employer company-name: STRING employees soc-security-no:STRING address:STRING Classes with reverse references. I Semantic Extensions associations of the ternary grade and associations which have their own attributes.
Object- Oriented Database Systems: Concepts and Architectures by Elisa Bertino