$params = array(

     'notes_title'=>$accountname,
     'filesize' => $filesize,
     'filetype' => $filetype,
     'filename'=>$filename,
     'assigned_user_id'=>$assigned_user);

$objectJson = Zend_JSON::encode($params);

$moduleName = 'Documents';

$params = array("sessionName"=>$sessionId, "operation"=>'create', "element"=>$objectJson, "elementType"=>$moduleName);

[body] => {"success":false,"error":{"code":"DATABASE_QUERY_ERROR","message":"Database error while performing requested operation"}}

$jsonResponse = Zend_JSON::decode($response['body']);
   $savedObject = $jsonResponse['result'];

if($_FILES['fileToUpload']['name'] != ''){
$errCode=$_FILES['fileToUpload']['error'];
    if($errCode == 0){
        foreach($_FILES as $fileindex => $files)
        {
            if($files['name'] != '' && $files['size'] > 0){
                $filename = $_FILES['fileToUpload']['name'];
                $filename = from_html(preg_replace('/s+/', '_', $filename));
                $filetype = $_FILES['fileToUpload']['type'];
                $filesize = (string)$_FILES['fileToUpload']['size'];
                $filelocationtype = 'I';
                $binFile = sanitizeUploadFileName($filename, $upload_badext);
                $filename = ltrim(basename(" ".$binFile)); //allowed filename like UTF-8 characters
            }
        }

    }
}

Query Failed:UPDATE vtiger_notes SET filename = ? ,filesize = ?, filetype = ? , filelocationtype = ? , filedownloadcount = ? WHERE notesid = ?::->[1048]Column 'filesize' cannot be null