Error in term_fiels_admin() - postgres issue

Installation of module without problem, after adding a field to a term via "admin/content/taxonomy/term_fields/new" no result was given under admin/content/taxonomy/term_fields. I've searched for reason and found under the method term_fields_admin():

 $result = pager_query('SELECT tf.fid AS fid, tf.title AS title, tf.description AS description, v.name AS name
  										FROM {term_fields} tf
  										LEFT JOIN {vocabulary} v ON tf.vid = v.vid
  										ORDER BY v.name, tf.title', variable_get('term_fields_per_page', 25));
  $image_path = drupal_get_path('module', 'term_fields') . '/images/doc-option-add.png';
  if (db_affected_rows()) {
  	$existing_fields = array();

I mean, that
if (db_affected_rows())
doesn't work. db_affected_rows() only determines the number of rows changed by the a query, the "select" doesn't work with my system (postgres).

My solution for that line of code: term_fields.admin.inc

 $image_path = drupal_get_path('module', 'term_fields') . '/images/doc-option-add.png';
  if ($result) {
  	$existing_fields = array();

Also the term_fields.module contains that

					case 'update':
						// see if theres a record for this term already.
						// if so, update it. if not, insert a new record
						$sql = 'SELECT tid FROM {term_fields_term} WHERE tid = %d';
						db_query($sql, $tid);
						if (db_affected_rows()) {
							// update the existing record
							term_fields_term_update_record($tid, $values);
						}
						else {
							// insert a new record
							term_fields_term_create_record($tid, $values);
						}
						break;

I replaced

						db_query($sql, $tid);
						if (db_affected_rows()) {

with

						$result=db_query($sql, $tid);
						$r=db_fetch_object($result);


						if (is_numeric(intval($r->tid)) && $r->tid >0) {