intController() and __construct()

I'd like to make sure I have my head wrapped around the removal no longer need of __contruct() from controllers to construct the parent.


I I've got that 

PHP Code:

public function __construct()
{
   parent::__construct();
} 


specifically is no longer needed as intController() takes care of all that.


So, where I'm a bit fuzzy is this:
When I need/want to initialize a controller wide access to a resource, IE: (shortened for brevity),
The "old way"

PHP Code:

<?php namespace App\Controllers;

use CodeIgniter\Controller;

class MyController extends Controller
{

    /**
    * The database object
    *
    * @var object
    */
    protected $db;

    /**
    * The query builder object
    *
    * @var object
    */
    protected $builder;

        /**
    * The name of the table
    *
    * @var string
    */
    public $table = '';

    // ------------------------------------------------------------------------

    /**
    * Setup all vars
    *
    * @param array $config
    * @return void
    */
    public function __construct($config = array())
    {
        // database connection
        $this->db = \Config\Database::connect();
        
        // set the table
        $this->builder = $this->db->table($this->table);
    }

        // etc...
} 


Is this still valid to set up a controller-wide available resource?

or should we be using these in each method when we need them and not use __construct() at all?  IE:

PHP Code:

<?php namespace App\Controllers;

use CodeIgniter\Controller;

class MyController extends Controller
{

    /**
    * The database object
    *
    * @var object
    */
    protected $db;

    /**
    * The query builder object
    *
    * @var object
    */
    protected $builder;

        /**
    * The name of the table
    *
    * @var string
    */
    public $table = '';

    // ------------------------------------------------------------------------

    
    public function someMethod($someVar)
    {
        // database connection
        $this->db = \Config\Database::connect();
        
        // set the table
        $this->builder = $this->db->table($this->table);

                $q = $this->builder->select('someField')->where('someField', $someVar)->getResult();

                // do something with $q...
    }

        // etc...
} 


I realize using database and builder is open to 'the fat/skinny controller/model argument', this is just an example to ask my question...

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