Convert MySQL to pdo statement with json - mysql

Question

I am having an issue with getting this working with PDO not sure how to do it. I tried but kept getting an error. I will keep trying to figure it out. If anyone can point me in the write direction would be a big help
/** Function to Add Product **/
function add_product() {
$data = json_decode(file_get_contents("php://input"));
$prod_name = $data->prod_name;
$prod_desc = $data->prod_desc;
$prod_price = $data->prod_price;
$prod_quantity = $data->prod_quantity;
print_r($data);
$qry = 'INSERT INTO product (prod_name,prod_desc,prod_price,prod_quantity) values ("' . $prod_name . '","' . $prod_desc . '",' .$prod_price . ','.$prod_quantity.')';
$qry_res = mysql_query($qry);
if ($qry_res) {
$arr = array('msg' => "Product Added Successfully!!!", 'error' => '');
$jsn = json_encode($arr);
// print_r($jsn);
}
else {
$arr = array('msg' => "", 'error' => 'Error In inserting record');
$jsn = json_encode($arr);
// print_r($jsn);
}
}
/** Function to Get Product **/
function get_product() {
$qry = mysql_query('SELECT * from product');
$data = array();
while($rows = mysql_fetch_array($qry))
{
$data[] = array(
"id" => $rows['id'],
"prod_name" => $rows['prod_name'],
"prod_desc" => $rows['prod_desc'],
"prod_price" => $rows['prod_price'],
"prod_quantity" => $rows['prod_quantity']
);
}
print_r(json_encode($data));
return json_encode($data);
}
what I tried and I get no data inserting
/** Function to Add Product **/
function add_product() {
$data = json_decode(file_get_contents("php://input"));
$prod_name = $data->prod_name;
$prod_desc = $data->prod_desc;
$prod_price = $data->prod_price;
$prod_quantity = $data->prod_quantity;
print_r($data);
$qry = "INSERT INTO product (prod_name,prod_desc,prod_price,prod_quantity) VALUES (:prod_name,:prod_desc,:prod_price,:prod_quantity)";
$q = $conn->prepare($qry);
$q->execute(array(':prod_name'=>$prod_name,
':prod_desc'=>$prod_desc,
':prod_price'=>$prod_price,
':prod_quantity'=>$prod_quantity,
));
$qry_res = mssql_query($qry);
if ($qry_res) {
$arr = array('msg' => "Product Added Successfully!!!", 'error' => '');
$jsn = json_encode($arr);
// print_r($jsn);
}
else {
$arr = array('msg' => "", 'error' => 'Error In inserting record');
$jsn = json_encode($arr);
// print_r($jsn);
}
}
db setup
<?php
/****** Database Details *********/
$host = "localhost";
$user = "root";
$pass = "";
$database = "shopping";
$con = mysql_connect($host,$user,$pass);
if (!$con) {
die('Could not connect: ' . mysql_error());
}
//echo 'Connected successfully';
mysql_select_db($database,$con);
/*******************************/
?>