PHP无法填充CSV文件

Question

所以我目前遇到了我的代码问题，我试图改变的csv文件没有填充我的SQL数据库中的数据。 csv文件正在被改变，因为每次运行我的提交按钮时，csv文件会与最新提交同时更新。因此，我怀疑我的问题与我与sql数据库通信的方式或数据被解析为csv文件的方式有关。我的代码链接如下。谢谢你的时间和期待。注意我没有收到任何错误。

<?php

  if(isset($_POST['submit']))
  {
      $db = get_db_connection('swcrc');
        $db->connect();

      $filename = 'uploads/testfile.csv';

      $fp = fopen($filename,"w");

      $db -> query("SELECT * FROM dbo.Response");
  $q = $db;
      $result = mysql_query($q) or die ('SQL Error :: '.mysql_error());
      $num_rows = $result->num_rows;

        $row = mysql_fetch_assoc($q);
        $seperator = "";
        $comma = "";

        foreach($row as $name => $value)
        {
            $seperator .= $comma . '' .str_replace('','""',$name);
            $comma = ",";
        }
        $seperator = "\n";

        echo $seperator;

        fputs($fp,$seperator);

        mysql_data_seek($q,0);

        while($row = mysql_fetch_assoc($q))
        {
        $seperator = "";
        $comma = "";

        foreach($row as $name => $value)
        {
            $seperator .= $comma . '' .str_replace('','""',$value);
            $comma = ",";
        }
        $seperator = "\n";
        fputs($fp,$seperator);
        }


        fclose($fp);
  }

?> 

新代码：

$conn = get_db_connection('swcrc');
      $conn->connect();

      $sql = query("SELECT [request_ID], [user_ID], [complete], [comment], [response_date],                                    [animalClass],[animalCommon], [bioSurveyStatus]  FROM dbo.Response");
      $results = $conn->query($sql);
      $filename = 'uploads/testfile.csv';

      $handle = fopen($filename, 'w+'); 
      fputcsv($handle, array('request_ID','user_ID','complete','comment','response_date','animalClass',
                             'animalCommon','bioSurveyStatus')); 

      foreach($result as $row)
      {
          fputcsv($handle, array($row['request_ID'], $row['user_ID'],$row['complete'],$row['comment'],
                                      $row['response_date'],$row['animalClass'],$row['animalCommon'],
                                      $row['bioSurveyStatus']));
      }
      fclose($handle);