can someone help me change function to run codeigniter 4 ?

i have two function below:
1.

PHP Code:

public function vlChos(){
        $query = "SELECT id, name FROM categories WHERE parent_id = '429' ";
          $query=$this->db->query($query);
          return $query->getResultArray();
        } 


function 1  working in codeigniter 4

function 2

PHP Code:

public function vlDemo(){
        $this->db->select('id,name');
        $this->db->where('parent_id','429');
        $q=$this->db->get('categories');
        $rs=$q->getResult();
        return $rs;
        } 


function 2 dont working in codeigniter 4,

can someone help me rewrite function 2 to working in codeigniter 4 ?

thank you in a advance

note for newbaby to start learn codeigniter 4 like me

we use builder to connect  to database

PHP Code:

public function vlDemos(){
        $builder = $this->db->table("categories");
        $builder->select('id,name');
        $builder->where('parent_id','429');
        $query = $builder->get();
        return $query->getResult();
        } 


i write this function , code perfect in codeigniter

stop help thank you very much