drupal tablesort_sql sort by default but don't show in header

I want to create a simple table and make it available for user to sort on the headers. Using the tablesort_sql() function and sending the $header into theme() this can be done easy and nice.

But i want to sort by default on a field that is not visible to the users. as example: I want the content to be sorted by the created date, but i dont want to show that to the users

So here is what I've got:

function vacancies_overview() { GLOBAL $user;

$header = array(
        array('field' => 'created', 'sort' => 'desc'),
        array('data' => t('title'), 'field' => 'title'),
);


$sql = "SELECT n.nid, n.title FROM {node} n WHERE n.type = 'mycontenttype' AND n.status = 1 AND n.uid = %d" . tablesort_sql($header);


$result = pager_query($sql, 30, 0, NULL, $user->uid);
while ($data = db_fetch_object($result)) {
    $开发者_JAVA百科rows[] = array(
        _mycontent_format_title_link($data->title, $data->nid),
    );
}

$output = theme('table', $header, $rows);
$output .= theme('pager', NULL, 30, 0);

return $output;

}

A quick solution would be to do something like this:

$header = array(
    array('field' => 'created', 'sort' => 'desc'),
    array('data' => t('title'), 'field' => 'title'),
);

$header_sort = $header;
$header_sort[] = array(...); // Add the default sort.

Then you can use header_sort for the sql and $header for the theming of the table.