Laravel Dynamimc Database configuration

gistfile1.php

 Config::set('database.connections.dbconnection', array(
    'driver'    => 'mysql',
    'host'      => $host,
    'database'  => $nome_banco,
    'username'  => $login,
     'password'  => $senha,
      'charset'   => 'utf8',
       'collation' => 'utf8_general_ci',
      'prefix'    => '',
 ));
 Config::set('database.default', 'dbconnection');
 $users = DB::select('SELECT * FROM usuarios');