public function setPosition($top, $left, $key)
{
$sql = "SELECT count(*) FROM `positions` WHERE `id`=:id";
$result = $this->getInstance()->prepare($sql);
$result->execute(array(':id' => $key));
$number_of_rows = $result->fetchColumn();
if ($number_of_rows > 0) {
return Database::Update(array(':top' => $top, ':left' => $left, ':id' => $key));
}
}
