Why is my server giving problems?

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PHP

I have created a folder inside the wamp server setup end as "android_connect" and have uploaded my php files there. you can see the file path if you want in the errors below.. the files are :

db_config.php

<?php
define('DB_USER',"root");
define('DB_PASSWORD',"vikrant");
define('DB_DATABASE',"sys");
define('DB_SERVER',"Local instance wampmysqld64");
?>;

db_connect.php

<?php
class DB_CONNECT{
	function _construct(){
		$this->connect();
	}
	function _destruct(){
		$this->close();
	}
	function connect(){
		require_once_DIR_.'/dbconfig.php';
		$con=mysql_connect(DB_SERVER, DB_USER, DB_PASSWORD) or die(mysql_error());
		$db=mysql_select_db(DB_DATABASE) or die(mysql_error()) or die(mysql_error());
		return $con;
	}
	function close(){
		mysql_close();
	}
}
?>;

get_all_products.php

<?php
$response=array();
require_once_DIR_.'/db_connect.php';
$db=new DB_CONNECT();
$result=mysql_querry("SELECT * FROM users") or die(mysql_error());
if(mysql_num_rows($result)>0){
	$response["products"]=array();
	while($row=mysql_fetch_array($result)){
		$product=array();
		$product["pid"]=$row["pid"];
		$product["name"]=$row["name"];
		$product["price"]=$row["price"];
		$product["description"]=$row["description"];
		$product["created_at"]=$row["created_at"];
		$product["updated_at"]=$row["updated_at"];
		array_push($response["products"],$product);
	}
	$response["success"]=1;
	echo json_encode($response);
}else{
	$response["success"]=0;
	$response["message"]="No Product Found.";
	echo json_encode($response);
}
?>;

which is giving errors:

Deprecated: mysql_query(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in C:\wamp64\www\android_connect\get_all_products.php on line 5

Warning: mysql_query(): Access denied for user ''@'localhost' (using password: NO) in C:\wamp64\www\android_connect\get_all_products.php on line 5

Warning: mysql_query(): A link to the server could not be established in C:\wamp64\www\android_connect\get_all_products.php on line 5

These are some of many files i have tried uploading. Please help and thank you in advance.

What I have tried:

Tried rewritng the code and reuploading it..