ErrorException Undefined variable: db

I have been using CodeIgniter since version 2 and been using version 3 until this day. I would like to try CodeIgniter 4 but I can't seem to load the database library, even if the database is defined on my BaseController:
Here's the BaseController

PHP Code:

<?php

namespace App\Controllers;

use CodeIgniter\Controller;
use CodeIgniter\HTTP\CLIRequest;
use CodeIgniter\HTTP\IncomingRequest;
use CodeIgniter\HTTP\RequestInterface;
use CodeIgniter\HTTP\ResponseInterface;
use Psr\Log\LoggerInterface;

/**
 * Class BaseController
 *
 * BaseController provides a convenient place for loading components
 * and performing functions that are needed by all your controllers.
 * Extend this class in any new controllers:
 *    class Home extends BaseController
 *
 * For security be sure to declare any new methods as protected or private.
 */

class BaseController extends Controller
{
 /**
 * Instance of the main Request object.
 *
 * @var IncomingRequest|CLIRequest
 */
 protected $request;

 /**
 * An array of helpers to be loaded automatically upon
 * class instantiation. These helpers will be available
 * to all other controllers that extend BaseController.
 *
 * @var array
 */
 protected $helpers = [];

 /**
 * Constructor.
 *
 * @param RequestInterface  $request
 * @param ResponseInterface $response
 * @param LoggerInterface  $logger
 */
 public function initController(RequestInterface $request, ResponseInterface $response, LoggerInterface $logger)
 {
 // Do Not Edit This Line
 parent::initController($request, $response, $logger);

 //--------------------------------------------------------------------
 // Preload any models, libraries, etc, here.
 //--------------------------------------------------------------------
 // E.g.: $this->session = \Config\Services::session();
 $this->session = \Config\Services::session();
 $this->db = \Config\Database::connect(); 
 }
} 


and this is my Controller

PHP Code:

<?php 
namespace App\Controllers;
use CodeIgniter\Controller;

class Landing extends BaseController{
 
 public function index(){
 
 var_dump($db);
 echo 'test';
 }
} 


Whenever I try to go to Landing controller it gives ErrorException that $db is undefined. But if I declare the $db = \Config\Database::connect(); on my Landing controller it works. I just want to make it global.

$db doesn't exists, use $this->db to access the variable from your base controller.

---

Also, don't try to use CI4 the "CI3 way". There's no more global object linking to everything like there was in CI3. The model class already have a reference to the db object, so there's no need to load it in the base controller and keep a reference in memory.

db is a shared instances.

$db = db_connect()

from model class , can access thru : $this->db

If you use the model the db connection is already made.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )