Call $this->db from initController in __construct?

Hi,

is it possible to use $this->db in controller in __construct function from BaseController?
This is my code:

PHP Code:

    public function __construct()
    {

        $data = [];

        $dbData = $this->db->query("SELECT * FROM myTable");
        $resultBots = $dbData->getResultArray();



    } 


However, I get a "We hit a snag" error.