br.com.bibliotecasj.DAO.UsuarioDAO.java Source code

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Here is the source code for br.com.bibliotecasj.DAO.UsuarioDAO.java

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package br.com.bibliotecasj.DAO;

import br.com.bibliotecasj.Model.Usuario;
import br.com.bibliotecasj.util.HibernateUtil;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

/**
 *
 * @author Aluno
 */
public class UsuarioDAO implements DAOGenerico<Usuario> {

    public static UsuarioDAO instance;

    public UsuarioDAO() {

    }

    public static UsuarioDAO getInstance() {
        if (instance == null) {
            instance = new UsuarioDAO();
        }
        return instance;
    }

    @Override
    public void salvar(Usuario usu) {
        //Pega uma session na fabrica de sessoes e armazena na variavel "sessao"
        Session sessao = HibernateUtil.getSessionFactory().openSession();
        Transaction transacao = null;

        try {
            transacao = sessao.beginTransaction();
            sessao.save(usu);
            sessao.getTransaction().commit();

        } catch (RuntimeException ex) {
            if (transacao != null) {
                //desfaz a transacao
                transacao.rollback();
            }
        } finally {
            sessao.close();
        }
    }

    @Override
    public void alterar(Usuario usu) {
        //Pega uma session na fabrica de sessoes e armazena na variavel "sessao"
        Session sessao = HibernateUtil.getSessionFactory().openSession();
        Transaction transacao = null;

        try {
            transacao = sessao.beginTransaction();
            sessao.update(usu);
            sessao.getTransaction().commit();

        } catch (RuntimeException ex) {
            if (transacao != null) {
                //desfaz a transacao
                transacao.rollback();
            }
        } finally {
            sessao.close();
        }
    }

    @Override
    public Usuario buscar(String cpf) {
        Session sessao = HibernateUtil.getSessionFactory().openSession();
        Usuario usu = null;
        try {

            Query consulta = sessao.getNamedQuery("Usuario.BuscarCpf");
            consulta.setString("cpf", cpf);
            usu = (Usuario) consulta.uniqueResult();
        } catch (RuntimeException ex) {
            throw ex;

        } finally {
            sessao.close();
        }
        return usu;
    }

    @Override
    public void deletar(String usu) {
        Session sessao = HibernateUtil.getSessionFactory().openSession();
        Transaction transacao = null;

        try {
            transacao = sessao.beginTransaction();
            Usuario usuario = buscar(usu);
            sessao.delete(usuario);
            sessao.getTransaction().commit();

        } catch (RuntimeException ex) {
            if (transacao != null) {
                transacao.rollback();
            }
        } finally {
            sessao.close();
        }
    }

    @Override
    public List<Usuario> listarTodos() {
        Session sessao = HibernateUtil.getSessionFactory().openSession();
        List<Usuario> usu = null;
        try {
            sessao.beginTransaction();
            Query consulta = sessao.getNamedQuery("Usuario.listar");
            usu = consulta.list();
        } catch (RuntimeException ex) {
            sessao.getTransaction().commit();

        } finally {
            sessao.close();
        }
        return usu;
    }
}