mysql query W php

I'm try to connect to a database: the connection works but i don;t get
a anything form it, where is the error?

<?php
@ $db=mysql_pconnect('localhost', 'database_name', 'password');
if (!$db)
{
echo 'conneciton error';
exit;
}
else
{
echo 'connection on!';
}
mysql_select_db('books'); //books: a database that i
previously created.
$query="select * from orders"; //orders: a table that i have
previosly created.
$result=mysql_query($query);
$num_results=mysql_num_rows($result);
if ($num_results = 0)
{
echo'<br><br>nothing to dispaly';
}
else
{
echo'<br><br>here are the results: $num_results';
}
?>

vinnie wrote:
> I'm try to connect to a database: the connection works but i don;t get
> a anything form it, where is the error?
>
> <?php
> @ $db=mysql_pconnect('localhost', 'database_name', 'password');
> if (!$db)
> {
> echo 'conneciton error';
> exit;
> }
> else
> {
> echo 'connection on!';
> }
> mysql_select_db('books'); //books: a database that i
> previously created.
> $query="select * from orders"; //orders: a table that i have
> previosly created.
> $result=mysql_query($query);
> $num_results=mysql_num_rows($result);
> if ($num_results = 0)
> {
> echo'<br><br>nothing to dispaly';
> }
> else
> {
> echo'<br><br>here are the results: $num_results';
> }
> ?>
>

if ($num_results == 0)

Norm