问题
I need a help to migrate the code with createCriteria
for Hibernate 5
, the code is this below:
public Curso comDadosIguais(Curso curso) {
return (Curso) this.session.createCriteria(Curso.class)
.add(Restrictions.eq("codigo", curso.getCodigo()))
.uniqueResult();
}
Could you help me?
回答1:
There are a number of options you can exercise to migrate from the deprecated Hibernate Criteria API, these are just a few that immediately come to mind:
- HQL / JPQL
- Named query
- JPA Criteria API
From a HQL / JPQL perspective, you could rewrite your query as a string:
Curso result = session.createQuery( "FROM Curso WHERE codigo = :codigo" )
.setParameter( "codigo", curso.getCodigo() )
.uniqueResult();
You can also use a @NamedQuery
which is basically an annotation you apply to an entity or a package where you supply a HQL query much like you see above, specifying a placeholder for your query parameters much in the same way and then supplying those parameters are runtime when you execute the query, like:
Curso result = session.createNamedQuery( "Curso.findByCodigo" )
.setParameter( "codigo", curso.getCodigo() )
.uniqueResult();
And finally, you can also consider the JPA Criteria API. This is available if you're using a JPA EntityManager
rather than a Hibernate Session
.
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Curso> query = cb.createQuery( Curso.class );
Root<Curso> root = query.from( Curso.class );
query.select( root )
.where( cb.eq( root.get( "codigo" ), curso.getCodigo() ) );
Curso result = entityManager.createQuery( query ).getSingleResult();
来源:https://stackoverflow.com/questions/41773336/hibernate-5-createcriteria-deprecated