Chapter 6. Mapping inheritance
In this chapter
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Inheritance-mapping strategies
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Polymorphic associations
We deliberately haven’t talked much about inheritance mapping so far. Mapping a hierarchy of classes to tables can be a complex issue, and we present various strategies in this chapter.
A basic strategy for mapping classes to database tables might be “one table for every entity persistent class.” This approach sounds simple enough and indeed works well, until we encounter inheritance.
Inheritance is such a visible structural mismatch between the object-oriented and relational worlds because object-oriented systems model both is a and has a relationships. SQL-based models provide only has a relationships; SQL database management systems ...
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