Chapter 8 O/R Mapping Modeling
Associations can have association classes.
Regarding O/R Mapping, association class is only meaningful for many-to-many associations. Persistent attributes in the association entity class will be transformed into columns of the middle table.
Given the example listed in the Many-to-many transformation section; we now define one association class to hold ultra information for the association:
The generated middle table and reference keys will be the following:
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