MySQL kill process is user don't got enough points PHP [closed] - php

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The coding below works like when a user clicks submit, he get one ticket (lodd) and loses five points because he bought one ticket for five points. But I miss when a user don't get five points he can't buy. I want that if the user doesn't get enough points then an echo says (example):
Sorry, but you need at least five points to buy a ticket.
How can I do that? Now people only go in minus if they buy more than they have.
<?php
session_start();
//=============Configuring Server and Database=======
$host = 'localhost';
$user = 'root';
$password = '';
//=============Data Base Information=================
$database = 'login';
$conn = mysql_connect($host,$user,$password) or die('Server Information is not Correct'); //Establish connection with the server
mysql_select_db($database,$conn) or die('Database Information is not correct');
//===============End Server Configuration============
//=============Starting Registration Script==========
$username = mysql_real_escape_string($_POST['txtusername']);
//=============To Encrypt Password===================
//============New Variable of Password is Now with an Encrypted Value========
$insert = "UPDATE `users` SET `points` = (`points`-5) WHERE `username` = '".$username."'";
mysql_query($insert);
// Other code
$insert = "UPDATE `users` SET `lodd` = (`lodd` +1) WHERE `username` = '".$username."'";
mysql_query($insert);
mysql_query($insert);
header('location: succes.php');
?>
This is the code that give people one ticket for five points:
$insert = "UPDATE `users` SET `points` = (`points`-5) WHERE `username` = '".$username."'";
mysql_query($insert);
// Other code
$insert = "UPDATE `users` SET `lodd` = (`lodd` +1) WHERE `username` = '".$username."'";
mysql_query($insert);
mysql_query($insert);

Answer 1

First, mysql_* are deprecated so you should look at changing them at some point. One option is to use: MySQLi
Back to your question, you could do this:
$insert = "UPDATE `users` SET `points` = (`points`-5) WHERE `username` = '".$username."' and points > 5";
mysql_query($insert);
if (mysql_affected_rows() > 0)
{
// other codes
$insert = "UPDATE `users` SET `lodd` = (`lodd` +1) WHERE `username` = '".$username."'";
mysql_query($insert);
}else{
echo "You don't have enough points";
}