public void destroy(Integer id) throws NonexistentEntityException {
   EntityManager em = null;
   try {
     em = getEntityManager();
     em.getTransaction().begin();
     OrdenCompra ordenCompra;
     try {
       ordenCompra = em.getReference(OrdenCompra.class, id);
       ordenCompra.getCodOrden();
     } catch (EntityNotFoundException enfe) {
       throw new NonexistentEntityException(
           "The ordenCompra with id " + id + " no longer exists.", enfe);
     }
     em.remove(ordenCompra);
     em.getTransaction().commit();
   } finally {
     if (em != null) {
       em.close();
     }
   }
 }
 public void edit(OrdenCompra ordenCompra) throws NonexistentEntityException, Exception {
   EntityManager em = null;
   try {
     em = getEntityManager();
     em.getTransaction().begin();
     ordenCompra = em.merge(ordenCompra);
     em.getTransaction().commit();
   } catch (Exception ex) {
     String msg = ex.getLocalizedMessage();
     if (msg == null || msg.length() == 0) {
       Integer id = ordenCompra.getCodOrden();
       if (findOrdenCompra(id) == null) {
         throw new NonexistentEntityException(
             "The ordenCompra with id " + id + " no longer exists.");
       }
     }
     throw ex;
   } finally {
     if (em != null) {
       em.close();
     }
   }
 }
 private void btn_imprimirActionPerformed(
     java.awt.event.ActionEvent evt) { // GEN-FIRST:event_btn_imprimirActionPerformed
   // TODO add your handling code here:
   OrdenCompra o = obtenerOrden(codigo);
   imprimir(o.getCodOrden());
 } // GEN-LAST:event_btn_imprimirActionPerformed