shopping cart php pdo mysql ajax

1	<?php
2	/**
3	 * @package Cart class
4	 *
5	 * @author TechArise Team
6	 *
7	 * @email  info@techarise.com
8	 *   
9	 */
10 
11	include("DBConnection.php");
12	class Cart 
13	{
14 
15	    protected $db;
16	    private $_sku;
17	    public function setSKU($sku) {
18	        $this->_sku = $sku;
19	    }
20 
21	    public function __construct() {
22	        $this->db = new DBConnection();
23	        $this->db = $this->db->returnConnection();
24	    }
25 
26	    // getAll Product
27	    public function getAllProduct() {
28	    	try {
29	    		$sql = "SELECT * FROM products";
30			    $stmt = $this->db->prepare($sql);
31 
32			    $stmt->execute();
33			    $result = $stmt->fetchAll(\PDO::FETCH_ASSOC);
34	            return $result;
35			} catch (Exception $e) {
36			    die("Oh noes! There's an error in the query!");
37			}
38	    }
39 
40	    // get Student
41	    public function getProduct() {
42	    	try {
43	    		$sql = "SELECT * FROM products WHERE sku=:sku";
44			    $stmt = $this->db->prepare($sql);
45			    $data = [
46			    	'sku' => $this->_sku
47				];
48			    $stmt->execute($data);
49			    $result = $stmt->fetch(\PDO::FETCH_ASSOC);
50	            return $result;
51			} catch (Exception $e) {
52			    die("Oh noes! There's an error in the query!");
53			}
54	    }
55 
56	}
57	?>
58