function db_insert($table, array $options = array()) {
       // ...
       return Database::getConnection($options['target'])->insert($table, $options);
     }

function example_menu() {
       $items['node/%node/example'] = array(
         'page callback' => 'example_page',
         'page arguments' => array(1),
         // ...
       );
       return $items;
     }

     function example_page($node) {
       // Do useful stuff here.
     }