Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package br.com.semanticwot.cd.daos; import br.com.semanticwot.cd.models.Role; import java.util.List; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.TypedQuery; import org.springframework.stereotype.Repository; /** * * @author nailton */ @Repository public class RuleDAO extends AbstractJpaDAO<Role> implements IRuleDAO { @PersistenceContext // Diz que a classe requer um objeto de persistencia private EntityManager entityManager; // Regra de negocio @Override public Role findByName(String name) { TypedQuery<Role> query = entityManager .createQuery("select distinct(p) from Role p where p.name=:name", Role.class) .setParameter("name", name); return query.getSingleResult(); } }