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15.4. Associations
By navigating associations using
createCriteria()
you can specify constraints upon related entities:
List cats = sess.createCriteria(Cat.class) .add( Restrictions.like("name", "F%") ) .createCriteria("kittens") .add( Restrictions.like("name", "F%") ) .list();
List cats = sess.createCriteria(Cat.class)
.add( Restrictions.like("name", "F%") )
.createCriteria("kittens")
.add( Restrictions.like("name", "F%") )
.list();
The second
createCriteria()
returns a new instance of Criteria
that refers to the elements of the kittens
collection.
There is also an alternate form that is useful in certain circumstances:
List cats = sess.createCriteria(Cat.class) .createAlias("kittens", "kt") .createAlias("mate", "mt") .add( Restrictions.eqProperty("kt.name", "mt.name") ) .list();
List cats = sess.createCriteria(Cat.class)
.createAlias("kittens", "kt")
.createAlias("mate", "mt")
.add( Restrictions.eqProperty("kt.name", "mt.name") )
.list();
(
createAlias()
does not create a new instance of Criteria
.)
The kittens collections held by the
Cat
instances returned by the previous two queries are not pre-filtered by the criteria. If you want to retrieve just the kittens that match the criteria, you must use a ResultTransformer
.