how to use more than one database in codeigniter

1This is default database :
2
3$db['default'] = array(
4    ....
5  	....
6    'database' => 'mydatabase',
7    ....
8);
9Add another database at the bottom of database.php file
10
11$db['second'] = array(
12    ....
13  	....
14    'database' => 'mysecond',
15    ....
16);
17
18In autoload.php config file
19
20$autoload['libraries'] = array('database', 'email', 'session');
21
22The default database is worked fine by autoload the database library but second database load and connect by using constructor in model and controller...
23
24<?php
25    class Seconddb_model extends CI_Model {
26        function __construct(){
27            parent::__construct();
28            //load our second db and put in $db2
29            $this->db2 = $this->load->database('second', TRUE);
30        }
31
32        public function getsecondUsers(){
33            $query = $this->db2->get('members');
34            return $query->result(); 
35        }
36
37    }
38?>
39  
40/*
41I hope it will help you.
42Namaste
43Stay Home Stay Safe
44*/