Drupal 7 db_query - database

Question

The perfect little module for what I am looking to do was made for drupal 6 but to my dismay it doesn't work on drupal 7. I've have learned that drupal 7 has a new api for the database. I have tried to get it to work but I am admittedly out of my league here. I am hoping some one could give me a little guidance. Specifically with the db_query.
function webform_image_validation_webform_validation_validate($validator_name, $items,
$components, $rule) {
$errors = array();
if ($items) {
switch ($validator_name) {
case 'max_image_size':
$dimensions = explode('x', $rule['data']);
foreach ($items as $key => $val) {
if (is_numeric($val['_fid'])) {
$result = db_query("select * from {files} where fid = %d", $val['_fid']);
while ($data = db_fetch_object($result)) {
$thefile = $data;
}
$image_info = image_get_info($thefile->filepath);
if (webform_image_validation_validate_image($image_info, $dimensions[0], $dimensions[1], FALSE) === FALSE) {
$errors[$key] = t('Your image did not match the required width and/or height. (') . $dimensions[0] . t(' x ') . $dimensions[1] . t(')');
}
}
}
This is the error I receive.
Argument 2 passed to db_query() must be an array, string given, called in
/home/designco/public_html/dev/sites/all/modules/webform_image_validation/
webform_image_validation.module on line 69 and defined in
/home/designco/public_html/dev/includes/database/database.inc on line 2310
It appears I need to add an array but I get lost there. Any help would be appreciated. I'm just trying to find out if I'm the right track.

Answer 1

db_query works differently in Drupal7.
$result = db_query("select * from {files} where fid = %d", $val['_fid']);
while ($data = db_fetch_object($result)) {
$thefile = $data;
}
becomes
$results = db_query("select * from {files} where fid = :fid", array(':fid' => $val['_fid']));
foreach($results as $result) {
// Do your thing for each result.
}

Answer 2

Try changing
$result = db_query("select * from {files} where fid = %d", $val['_fid']);
while ($data = db_fetch_object($result)) {
$thefile = $data;
}
to
$query = db_select('files', 'f')
->fields('f')
->condition('fid', $val['_fid']);
$thefile = $query->execute()->fetchObject();
The Drupal 7 database API docs http://drupal.org/node/310069

Answer 3

thanks JurgenR for the answer.
Just to add one more thing: In drupal 6, we use '%s' for strings. In drupal 7, it is same for all.
For example:
$results = db_query("select * from {files}
where filename = :fname", array(':fname' => $filename));
If you want to search for records starting with a pattern then query will be:
$results = db_query("select * from {files}
where filename = :fname", array(':fname' => $filename.'%'));
Hope this is useful.