child class not calling parent parent functions

<?php  

class contacts  
{  
    public $name;
    public  $cno;
    public  $clocation;


    public function __construct($name,$cno,$clocation) 
    {
        $this->name = trim($name);
        $this->cno  = trim($cno);
        $this->clocation= trim($clocation); 
    }

    public function getName()
    {
        return $this->name;
    }

    public function getNO()
    {
        return $this->cno;
    }

    public function getLocation()
    {
        return $this->clocation;
    }
}  

class DataBaseAction extends contacts 
{  
    private $db_info;
    private $db_user;
    private $db_pass;
    private $db;
    private $stmt;


    public  function __construct()
    {
        $this->db_info ='mysql:host=localhost;dbname=finalproject';
        $this->db_user ='root';
        $this->db_pass ='mrhot';
    }

    public  function insert_contact($sql)
    {
        $this->db = new PDO($this->db_info, $this->db_user, $this->db_pass);
        $this->stmt= $this->db->prepare($sql);
        $this->stmt->execute(array($this->getName(),$this->getNO(),$this->getLocation()));
        $this->stmt->closeCursor();
    }
} 

$obj = new DataBaseAction();

$l=$obj->getName();

var_dump($l);