Building a drupal query

gistfile1.txt

$arg = "%".drupal_get_path_alias($_GET['q'])."%";
echo $arg;
$query = db_select('url_alias', 't');
$query->fields('t');
$query->condition('t.alias', '$arg', 'LIKE');
$query->range(0, 1);
$result = $query->execute();

while ($record = $result->fetchAssoc()) {
  print_r($record);
}

$arg = drupal_get_path_alias($_GET['q']);
$arg = db_like($arg) . '%';
$query = db_select('url_alias', 't');
$query->fields('t')
->condition('t.alias', '$arg', 'LIKE')
->range(0, 1);
$result = $query->execute();
$result->fetchAll();
print_r($result);