The various mapping association in Hibernate: Association mappings are often the most difficult thing to implement correctly. Those cases are one by one, starting with unidirectional mappings and then bidirectional cases. We will use Person and Address in all the examples.
Associations will be classified by multiplicity and whether or not they map to an intervening join table.
Nullable foreign keys are not considered to be good practice in traditional data modelling, so our examples do not use nullable foreign keys. This is not a requirement of Hibernate, and the mappings will work if you drop the nullability constraints.
The mapping of associations between entity classes and the relationships between tables is the soul of ORM. Following are the four ways in which the cardinality of the relationship between the objects can be expressed. An association mapping can be unidirectional as well as bidirectional.
Many-to-One Mapping many-to-one relationship using Hibernate
One-to-One Mapping one-to-one relationship using Hibernate
One-to-Many Mapping one-to-many relationship using Hibernate
Many-to-Many Mapping many-to-many relationship using Hibernate
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