image patch upload to sql

I am trying to upload to SQL database the name of the uploaded image (for example : test.png) using DW Server behaviors

I am getting this error message:

** Notice: Undefined index: upload in C:\xampp\htdocs\Foglalo\pages\addRooms.php on line 95 Column 'img' cannot be null" **

    <?php
        if (!fun

ction_exists("GetSQLValueString")) {
    function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
    {
      if (PHP_VERSION < 6) {
        $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
      }

      $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

      switch ($theType) {
        case "text":
          $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
          break;    
        case "long":
        case "int":
          $theValue = ($theValue != "") ? intval($theValue) : "NULL";
          break;
        case "double":
          $theValue = 

($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}

$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
  $editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "addRooms")) {




  $insertSQL = sprintf("INSERT INTO rooms (RoomName, City, Street, Postcode, RoomType, img) VALUES (%s, %s, %s, %s, %s, %s)",
                       GetSQLValueString($_POST['roomname'], "text"),
                       GetSQLValueString($_POST['city'], "text"),
                       GetSQLValueString($_POST['street'], "text"),
                       GetSQLValueString($_POST['postcode'], "text"),
                       GetSQLValueString($_POST['roomtype'], "text"),
                       GetSQLValueString($_POST['upload'], "text"));

  mysql_select_db($database_Foglalo, $Foglalo);
  $Result1 = mysql_query($insertSQL, $Foglalo) or die(mysql_error());
}

mysql_select_db($database_Foglalo, $Foglalo);
$query_addRoom = "SELECT * FROM rooms";
$addRoom = mysql_query($query_addRoom, $Foglalo) or die(mysql_error());
$row_addRoom = mysql_fetch_assoc($addRoom);
$totalRows_addRoom = mysql_num_rows($addRoom);
?>

my form

<form action="<?php echo $editFormAction; ?>" method="POST" enctype="multipart/form-data" name="addRooms" id="addRooms">
   <table width="600" align="center" class="TableRightBorder">
     <tbody>
       <tr>
         <td width="119">Room name</td>
         <td width="200"><input type="text" name="roomname" id="roomname" /></td>
         <td width="265">&nbsp;</td>
       </tr>
       <tr>
         <td height="20">&nbsp;</td>
         <td>&nbsp;</td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">City</td>
         <td><input type="text" name="city" id="city" /></td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">&nbsp;</td>
         <td>&nbsp;</td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">Street</td>
         <td><input type="text" name="street" id="street" /></td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">&nbsp;</td>
         <td>&nbsp;</td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">Postcode</td>
         <td><input type="text" name="postcode" id="postcode" /></td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">&nbsp;</td>
         <td>&nbsp;</td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">Room type</td>
         <td><select name="roomtype" id="roomtype">
           <option value="room">Room</option>
           <option value="office">Office</option>
         </select></td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">&nbsp;</td>
         <td>&nbsp;</td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">Room image</td>
         <td><input type="file" name="img" id="upload" /></td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">&nbsp;</td>
         <td>&nbsp;</td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">Description</td>
         <td><textarea name="textarea" id="textarea" cols="30" rows="5"></textarea></td>
         <td>&nbsp;</td>
         </tr>
       <tr>
         <td height="20">&nbsp;</td>
         <td>&nbsp;</td>
         <td>&nbsp;</td>
       </tr>
       <tr>
         <td height="20">&nbsp;</td>
         <td><input name="submit" type="submit" class="right" id="submit" value="Add room" /></td>
         <td>&nbsp;</td>
       </tr>
       </tbody>
   </table>
   <input type="hidden" name="MM_insert" value="addRooms" />
 </form>