Nette\Database\ResultSet::fetch PHP Method

    public function fetch()
    {
        $data = $this->pdoStatement ? $this->pdoStatement->fetch() : NULL;
        if (!$data) {
            $this->pdoStatement->closeCursor();
            return FALSE;
        } elseif ($this->result === NULL && count($data) !== $this->pdoStatement->columnCount()) {
            $duplicates = Helpers::findDuplicates($this->pdoStatement);
            trigger_error("Found duplicate columns in database result set: {$duplicates}.", E_USER_NOTICE);
        }
        $row = new Row();
        foreach ($this->normalizeRow($data) as $key => $value) {
            if ($key !== '') {
                $row->{$key} = $value;
            }
        }
        $this->resultKey++;
        return $this->result = $row;
    }