public function myRow($sql)
{
    $this->connect();
    $rec = $this->conn->query($sql);
    $this->recordCount = $rec->num_rows;

    if ($this->makeRecordCount) {
        $this->totalRecordCount = $this->recordCount;
    }

    if ($this->recordCount > 0) {
        $names = array();
        $result = array();
        $temp = array();
        $count = $rec->field_count;

        // Get fields name
        while ($fields = mysqli_fetch_field($rec)) {
            $names[] = $fields->name;
        }

        while ($row = $rec->fetch_assoc()) {
            foreach ($names as $name) {
                $temp[$name] = $row[$name];
            }

            array_push($result, $temp);
        }
    } else {
        $result = null;
    }

    $this->conn->close();

    return $result;
}

$sql = "SELECT * FROM `table`";
$datas = $class->myRow($sql);
$smarty->assign('datas', $datas);

$class->connect();
$sql = "SELECT * FROM `table`";
$datas = $class->myRow($sql);
$smarty->assign('datas', $datas);

$sql = "SELECT * FROM `table2`";
$datas = $class->myRow($sql);
$smarty->assign('data2s', $data2s);
$class->close();