Horde_Rdo_Mapper::findOne PHP Method

    public function findOne($arg = null)
    {
        if (is_null($arg)) {
            $query = null;
        } elseif (is_scalar($arg)) {
            $query = array($this->primaryKey => $arg);
        } else {
            $query = $arg;
        }
        // Build a full Query object, and limit it to one result.
        $query = Horde_Rdo_Query::create($query, $this);
        $query->limit(1);
        $list = new Horde_Rdo_List($query);
        return $list->current();
    }