artiste = artiste.replaceAll("'", ".");
Query q = em.createQuery("select a from Artiste a where a.nom='" + artiste + "'");
List results = q.getResultList();
if (!results.isEmpty()) {
Iterator stIterator = results.iterator();
Artiste a = (Artiste) stIterator.next();
return a;
} else {
return new Artiste(artiste);
}
}