hibernate-criteria

I have following Entity @Entity @Table(name = "rule") public class Rule implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "rule_id") private Long id; @ElementCollection(targetClass = Action.class) @CollectionTable(name = "rule_action", joinColumns = @JoinColumn(name = "rule_id")) @Enumerated(value = EnumType.STRING) @Column(name = "action") private Set<Action> actions; //After editing as per jbrookover's suggestion adding a new mapping @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY) @JoinColumn(name = "rule_id") private Set<RuleAction>

Using Hibernate's Criteria, I want to execute the equivalent of: select distinct uspscity, state from citycomplete where USPSCITY = 'HOUSTON' I thought doing the following would yield the results I wanted: ProjectionList projList = new ProjectionList(); projList.add(Projections.distinct(Projections.property("id.state"))); projList.add(Projections.distinct(Projections.property("id.uspsCity"))); criteria.setProjection(projList); But, what this actually does is execute something like: select distinct uspscity, distinct state from citycomplete where USPSCITY = 'HOUSTON' Which throws an error,

I have been reading some anwers, but i'm still confused. ¿Why? because the differences that you have mentioned do not relate with the performance. they are related with easy use.(Objetc(criteria) and SQL(hql)). But I would like to know if "criteria" is slower than hql for some reason. I read this in another anwers "There is a difference in terms of performance between HQL and criteriaQuery, everytime you fire a query using criteriaQuery, it creates a new alias for the table name which does not reflect in the last queried cache for any DB. This leads to an overhead of compiling the generated

I've have already implemented pagination using the following code: public Paginacao<Anuncio> consultarPaginado(int pagina, Integer cidadeId) { Criteria criteria = this.sessionFactory.getCurrentSession().createCriteria(Anuncio.class); criteria.add(Restrictions.eq("ativo", true)); criteria.add(Restrictions.eq("statusLiberacao", AnunciosUtil.STATUS_ANUNCIO_LIBERADO)); criteria.add(Restrictions.eq("statusVendaAnuncio", AnunciosUtil.STATUS_VENDA_ANUNCIO_DISPONIVEL)); if (cidadeId != null) { criteria.add(Restrictions.eq("cidade.id", cidadeId)); } criteria.addOrder(Order.desc("dataPostagem"));