Chapter 7. Advanced entity association mappings
When we use the word associations, we always refer to relationships between entities. In the previous chapter, we demonstrated a unidirectional many-to-one association, made it bidirectional, and finally turned it into a parent/children relationship (one-to-many and many-to-one with cascading options).
One reason we discuss more advanced entity mappings in a separate chapter is that quite a few of them are considered rare, or at least optional.
It's absolutely possible to only use component mappings and many-to-one (occasionally one-to-one) entity associations. You can write a sophisticated application without ever mapping a collection! Of course, efficient and easy access to persistent data, by ...
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