Hibernate: check if object exists

Question

Suppose, objects of type A are stored in DB. Here\'s the way I load specific one from DB using hibernate:

org.hibernate.Session session = ...;
long id         


        

Answer 1

A bit simplified method of @Journeycorner

public boolean exists(Class clazz, Object idValue) {
    return getSession().createCriteria(clazz)
            .add(Restrictions.idEq(idValue))
            .setProjection(Projections.id())
            .uniqueResult() != null;
}

A below method can be useful also. Keep in mind, that this method can be used only with the criteria that can produce not more than one record (like Restrictions.idEq() criteria)

public static boolean uniqueExists(Criteria uniqueCriteria) {
    uniqueCriteria.setProjection(Projections.id());
    return uniqueCriteria.uniqueResult() != null;
}