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You have a 1-N (one to many) when you have one object of a class that has a Collection/Map of
objects of another class. In the
java.util
package there are an assortment of possible
collection/map classes and they all have subtly different behaviour with respect to allowing nulls,
allowing duplicates, providing ordering, etc. There are two ways in which you can represent a
collection or map in a datastore :
Join Table
(where a join table is used to provide the
relationship mapping between the objects), and
Foreign-Key
(where a foreign key is placed
in the table of the object contained in the collection or map.
We split our documentation based on what type of collection/map you are using.
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