PHPExcel - 如何从多个查询中导出结果

Question

有没有办法使用PHPExcel将多个查询的结果导出到单个Excel工作表？这是我到目前为止所使用的一个查询：

<?php
// connection with the database
$dbhost = "localhost";
$dbuser = "admin";
$dbpass = "password";
$dbname = "databasename";

mysql_connect($dbhost,$dbuser,$dbpass);
mysql_select_db($dbname);

// require the PHPExcel file
require 'classes/PHPExcel.php';

// simple query

$query = "SELECT denisCheckedby, denisStatus, denisDate, denisNotes FROM tblDenis ORDER by denisID DESC";
$headings = array('Checked By', 'Successfull?','Date','Notes');

if ($result = mysql_query($query) or die(mysql_error())) {
    // Create a new PHPExcel object
    $objPHPExcel = new PHPExcel();
    $objPHPExcel->getActiveSheet()->setTitle('Backup Check');

    $rowNumber = 1;
    $col = 'A';
    foreach($headings as $heading) {
       $objPHPExcel->getActiveSheet()->setCellValue($col.$rowNumber,$heading);
       $col++;
    }

    // Loop through the result set
    $rowNumber = 2;
    while ($row = mysql_fetch_row($result)) {
       $col = 'A';
       foreach($row as $cell) {
          $objPHPExcel->getActiveSheet()->setCellValue($col.$rowNumber,$cell);
          $col++;
       }
       $rowNumber++;
    }

    // Freeze pane so that the heading line will not scroll
    $objPHPExcel->getActiveSheet()->freezePane('A2');

    $objPHPExcel->getActiveSheet()->getStyle('A1:D1')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);

    // Set column widths
    $objPHPExcel->getActiveSheet()->getColumnDimension('A')->setAutoSize(true);
    $objPHPExcel->getActiveSheet()->getColumnDimension('B')->setAutoSize(true);
    $objPHPExcel->getActiveSheet()->getColumnDimension('C')->setAutoSize(true);

    // Set fonts
    $objPHPExcel->getActiveSheet()->getStyle('A1:D1')->getFont()->setBold(true);

    // Save as an Excel BIFF (xls) file
    $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');

   header('Content-Type: application/vnd.ms-excel');
   header('Content-Disposition: attachment;filename="Backup Check.xls"');
   header('Cache-Control: max-age=0');

   $objWriter->save('php://output');
   exit();
}
echo 'a problem has occurred... no data retrieved from the database';
?>

如何使用多个查询执行相同的操作？例如，我的第二个查询是：

"SELECT curtisCheckedby, curtisStatus, curtisDate, curtisNotes FROM tblCurtis ORDER by curtisID DESC";

非常感谢您的帮助。