function getListaPaginadaJSON($pagina = 0, $rpp = 3, $condicion = "1=1", $parametros = array(), $orderby = "1")
{
$pos = $pagina * $rpp;
$sql = "select * from " . $this->tabla . " where {$condicion} order by {$orderby} limit {$pos}, {$rpp}";
$this->bd->setConsulta($sql, $parametros);
$r = "[ ";
while ($fila = $this->bd->getFila()) {
$objeto = new Respuesta();
$objeto->set($fila);
$r .= $objeto->getJSON() . ",";
}
$r = substr($r, 0, -1) . "]";
return $r;
}