Many-to-One Unidirectional
Relationships
Use
A many-to-one unidirectional relationship differs from a one-to-many bidirectional relationship by the missing field of type java.util.Set on the one side.
The relational model is the same as the relational model for a one-to-many bidirectional relationship.
The mapping metadata for the remaining field of a persistence capable class type is the same as the mapping metadata in the one-to-many bidirectional case.
This mapping pattern is the straightforward way to map a foreign key, which only needs to be navigated from the many to the one side.
See also: