Php class inside connection close or class close? - php

Question

i have php class USER and Database class im doing 10000 users app, and that user will be query 3-4 times a day minumum . my class base and function base here them looking yet for thats have any problem ? or need any fix ?
MY db class
class Database
{
private $host = "";
private $db_name = "";
private $username = "";
private $password = "";
public $conn;
public function dbConnection()
{
$this->conn = null;
try
{
$this->conn = new PDO("mysql:host=" . $this->host . ";dbname=" . $this->db_name, $this->username, $this->password);
$this->conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $exception)
{
print'{"success": "0","message": "Service Error, Please try again later "}';
}
return $this->conn;
}
}
Also my USER class here
<?php
require_once('dbconfig.php');
class USER
{
private $conn;
public function __construct()
{
$database = new Database();
$db = $database->dbConnection();
$this->conn = $db;
}
public function runQuery($sql)
{
$stmt = $this->conn->prepare($sql);
return $stmt;
}
public function updateProduct($name,$code,$description,$quantity,$price,$specialwarning,$productID)
{
try
{
$stmt2 = $this->conn->prepare("UPDATE Products SET productCode='$code',productName='$name',productDescription='$description',specialWarning='$specialwarning',productQuantity='$quantity',productPrice='$price' WHERE ID=$productID");
$stmt2->execute();
echo'{"success": "1", "message": "Product Updated"}';
return true;
}
catch(PDOException $e)
{
}
$this->conn = null; // HERE I DID NULL FOR DISABLE MAX CONNECTIONS
}
}
AND HER MY updateproduct.php
<?php
header('Content-type: application/json');
$name = $_REQUEST['name'];
$code = $_REQUEST['code'];
$description = $_REQUEST['description'];
$quantity = $_REQUEST['quantity'];
$price = $_REQUEST['price'];
$specialwarning = $_REQUEST['specialwarning'];
$productID = $_REQUEST['productID'];
include_once 'class.user.php';
$user = new USER($DB_con);
if($user->updateProduct($name,$code,$description,$quantity,$price,$specialwarning,$productID))
{
}
else
{
}
?>
Can you check my codes is good class for big users ? and good connection returns ? Can i add something ? or need any fix ?Also need to close class ?
Thanks