function leer_cuotas($dbhandler)
{
    $query = "SELECT * FROM Cuota";
    $table = $dbhandler->query($query);
    $result = array();
    if ($table->num_rows > 0) {
        // output data of each row
        while ($row = $table->fetch_assoc()) {
            $cuota = new Cuota();
            $cuota->read_cuota($row);
            $result[] = $cuota;
        }
    } else {
        echo "no results";
    }
    return $result;
}