HelloWorldDrupalModuleQuestion

<?php
/**
 * @file
 * @author Rakesh James (Modified by JP)
 * Contains \Drupal\example\Controller\ExampleController.
 * Please place this file under your example(module_root_folder)/src/Controller/
 */
namespace Drupal\example\Controller;
/**
 * Provides route responses for the Example module.
 */
class ExampleController
{
  /**
   * Returns a simple page.
   *
   * @return array
   *   A simple renderable array.
   */
  public function myPage()
  {
    $toPage = " ";
    $group  = "";

    db_set_active('001');

    $result = db_query("SELECT * FROM fav_links join fav_links_grp1 on flg1_code = fl_grp order by fl_grp");

    foreach ($result as $record)
    {
      if ($group <> $record->fl_grp)
      {
        $toPage = "$toPage<br><b>$record->flg1_name</b>";
      }
      $toPage = "$toPage<br><a href=\"$record->fl_url\">$record->fl_name</a>";
      $group=$record->fl_grp;
    }

    db_set_active();

    $element = array(
      '#markup' => t($toPage),
    );
    return $element;
  }
}
?>