July 2001
Intermediate to advanced
656 pages
15h 51m
English
book
Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
by Craig Larman
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34.1. The Problem: Persistent Objects
Assume that in the NextGen application, ProductSpecification data resides in a relational database. It must be brought into local memory during application use. Persistent objects are those that require persistent storage, such as ProductSpecification instances.
Storage Mechanisms and Persistent Objects
Object databases— If an object database is used to store and retrieve objects, no additional custom or third-party persistence services are required. This is one of several attractions for its use.
Relational databases— Because of the prevalence of RDBs, their use is often required, rather than the more convenient object databases. If this is the case, a number of problems arise due to the mismatch between ...
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