CodeIgniter connection to database

Question

I decided end my cooperation with Doctrine 2.3 and now I would like to make connection to database using only CodeIgniter have you got idea where is problem with my code?

This Error I get:

A PHP Error was encountered

Severity: Notice

Message: Undefined property: Hello::$db

Filename: core/Model.php

Line Number: 51

Database.php

$db['default']['hostname'] = 'localhost:8080';
$db['default']['username'] = 'root';
$db['default']['password'] = '';
$db['default']['database'] = 'ci_doctrine';
$db['default']['dbdriver'] = 'mysql';

Controller

<?php
    // system/application/controllers/hello.php

    class Hello extends CI_Controller {

        public function __construct()
        {
             parent::__construct();
        }
       function world() {
            echo "Hello CodeIgniter!";
        }

        function user_test() {

            $this->load->model('user');

            $this->user->save_User('username','password','first_name','last_name');

       }
}

?>

Model - table name in database "user"

<?php
    // system/application/models/user.php

    class User extends CI_Model {

            function __construct()
            {
                // Call the Model constructor
                parent::__construct();
            }

             function save_User($username,$password,$fName,$lName)  {

                $this->username   = $username; 
                $this->password = $password;
                $this->first_name    = $fName;
                $this->last_name    = $lName;
                $this->db->insert('user', $this);
              }

    }
?>

Answer 1

You need to load the database library:

config/autoload.php

$autoload['libraries'] = array('database');