Questo contenuto non è disponibile nella lingua selezionata.
15.8. Detached queries and subqueries
The
DetachedCriteria
class allows you to create a query outside the scope of a session and then execute it using an arbitrary Session
.
A
DetachedCriteria
can also be used to express a subquery. Criterion instances involving subqueries can be obtained via Subqueries
or Property
.
DetachedCriteria avgWeight = DetachedCriteria.forClass(Cat.class) .setProjection( Property.forName("weight").avg() ); session.createCriteria(Cat.class) .add( Property.forName("weight").gt(avgWeight) ) .list();
DetachedCriteria avgWeight = DetachedCriteria.forClass(Cat.class)
.setProjection( Property.forName("weight").avg() );
session.createCriteria(Cat.class)
.add( Property.forName("weight").gt(avgWeight) )
.list();
DetachedCriteria weights = DetachedCriteria.forClass(Cat.class) .setProjection( Property.forName("weight") ); session.createCriteria(Cat.class) .add( Subqueries.geAll("weight", weights) ) .list();
DetachedCriteria weights = DetachedCriteria.forClass(Cat.class)
.setProjection( Property.forName("weight") );
session.createCriteria(Cat.class)
.add( Subqueries.geAll("weight", weights) )
.list();
Correlated subqueries are also possible: