Function prepare() on a non-object error - php

Question

I have looked up the error for this and I think I am calling the statement before for it to be initialized. I have made a simple connection class that I can include into all of my files that will be talking to the mysql server. Knowing how I am with things, I am most likely over thinking things. I cant seem to find what I am doing wrong.....
Top part of the code is cut off as it only contains the HTML head and php starting code that is non-important for this.
//include database connection
include('connection.php');
$action = isset($_GET['action']) ? $_GET['action']: "";
if($action=='delete'){ //if the user clicked ok, run our delete query
try {
$query = "DELETE FROM sc_steamgames WHERE appid = ?";
$stmt = $con->prepare($query);
$stmt->bindParam(1, $_GET['appid']);
$result = $stmt->execute();
echo "<div>Record was deleted.</div>";
}catch(PDOException $exception){ //to handle error
echo "Error: " . $exception->getMessage();
}
}
//select all data
$query = "SELECT * FROM sc_steamgames";
$stmt = $con->prepare( $query );
$stmt->execute();
//this is how to get number of rows returned
$num = $stmt->rowCount();
echo "<a href='add.php'>Create New Record</a>";
if($num>0){ //check if more than 0 record found
echo "<table border='1'>";//start table
//creating our table heading
echo "<tr>";
echo "<th>AppID</th>";
echo "<th>Title</th>";
echo "<th>Release Date</th>";
echo "<th>Last Updated</th>";
echo "</tr>";
//retrieve our table contents
//fetch() is faster than fetchAll()
//http://stackoverflow.com/questions/2770630/pdofetchall-vs-pdofetch-in-a-loop
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
//extract row
//this will make $row['firstname'] to
//just $firstname only
extract($row);
//creating new table row per record
echo "<tr>";
echo "<td>{$appid}</td>";
echo "<td>{$title}</td>";
echo "<td>{$releasedate}</td>";
echo "<td>{$lastupdate}</td>";
echo "<td>";
//we will use this links on next part of this post
echo "<a href='edit.php?id={$appid}'>Edit</a>";
echo " / ";
//we will use this links on next part of this post
echo "<a href='#' onclick='delete_user( {$appid} );'>Delete</a>";
echo "</td>";
echo "</tr>";
}
echo "</table>";//end table
}else{ //if no records found
echo "No records found.";
}
?>
<script type='text/javascript'>
function delete_user( appid ){
//this script helps us to
var answer = confirm('Are you sure?');
if ( answer ){ //if user clicked ok
//redirect to url with action as delete and id to the record to be deleted
window.location = 'index.php?action=delete&id=' + appid;
}
}
</script>
</body>
</html>
connection.php
/* Database Info */
// Host/IP
$host = "localhost";
// Database Name
$db_name = "**";
// Username
$username = "**";
//Password
$password = "**";
/* End Database Info */
try {
$con = new PDO("mysql:host={$host};dbname={$db_name}", $username, $password);
}catch(PDOException $exception){ //to handle connection error
echo "Connection error: " . $exception->getMessage();
}