Drupal 7: Debug Query

gistfile1.php

<?php

function debug_query($query) {
  $querystring = $query->__toString();
  $querystring = str_replace("{", '', $querystring);
  $querystring = str_replace("}", '', $querystring);

  foreach ($query->getArguments() as $key => $item) {
    if (!$item) {
      $item = 'NULL';
    }
    $querystring = str_replace($key. ')', $item . ')', $querystring);
  }

  $tags = isset($query->alterTags) ? $query->alterTags : array();

  $debug = array(
    'query' => $querystring,
    'tags' => $tags,
  );

  dpm($debug);
}