An individual query criterion is an instance of the interface
org.hibernate.criterion.Criterion
. The class
org.hibernate.criterion.Restrictions
defines
factory methods for obtaining certain built-in
Criterion
types.
List cats = sess.createCriteria(Cat.class) .add( Restrictions.like("name", "Fritz%") ) .add( Restrictions.between("weight", minWeight, maxWeight) ) .list();
Restrictions may be grouped logically.
List cats = sess.createCriteria(Cat.class) .add( Restrictions.like("name", "Fritz%") ) .add( Restrictions.or( Restrictions.eq( "age", new Integer(0) ), Restrictions.isNull("age") ) ) .list();
List cats = sess.createCriteria(Cat.class) .add( Restrictions.in( "name", new String[] { "Fritz", "Izi", "Pk" } ) ) .add( Restrictions.disjunction() .add( Restrictions.isNull("age") ) .add( Restrictions.eq("age", new Integer(0) ) ) .add( Restrictions.eq("age", new Integer(1) ) ) .add( Restrictions.eq("age", new Integer(2) ) ) ) ) .list();
There are quite a range of built-in criterion types (Restrictions
subclasses), but one that is especially useful lets you specify SQL directly.
List cats = sess.createCriteria(Cat.class) .add( Restrictions.sqlRestriction("lower({alias}.name) like lower(?)", "Fritz%", Hibernate.STRING) ) .list();
The {alias}
placeholder with be replaced by the row alias
of the queried entity.
An alternative approach to obtaining a criterion is to get it from a
Property
instance. You can create a Property
by calling Property.forName()
.
Property age = Property.forName("age"); List cats = sess.createCriteria(Cat.class) .add( Restrictions.disjunction() .add( age.isNull() ) .add( age.eq( new Integer(0) ) ) .add( age.eq( new Integer(1) ) ) .add( age.eq( new Integer(2) ) ) ) ) .add( Property.forName("name").in( new String[] { "Fritz", "Izi", "Pk" } ) ) .list();