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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34.19. How to Represent Relationships in Tables
The code in the prior section relies on a MANU_OID foreign key in the PRODUCT_SPEC table to link to a record in the MANUFACTURER table. This highlights the question: How are object relationships represented in the relational model?
The answer is given in the Representing Object Relationships as Tables pattern {BW96], which proposes the following:
one-to-one associations
Place an OID foreign key in one or both tables representing the objects in relationship.
Or, create an associative table that records the OIDs of each object in relationship.
one-to-many associations, such as a collection
Create an associative table that records the OIDs of each object in relationship.
many-to-many associations
Create ...
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