Very simply, either your connection is messed up, you are not getting a result set back or there is an error in your sql

try this:

$result = mysql_query($query, $link) or die ("failed because ".mysql_error());

then start debugging


From: "Arne Essa Madsen" <[EMAIL PROTECTED]>
Reply-To: "Arne Essa Madsen" <[EMAIL PROTECTED]>
Subject: [PHP-DB] Problems with mysql_num-rows()
Date: Sun, 31 Oct 2004 19:32:09 +0100

I have the following problem:

This one does not work:
 $query = "SELECT * from user where name='$userid' and
  $result = mysql_query($query, $link);
  $num_rows = mysql_num_rows($result);

I get this error message:
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result
resource in c:\wamp\www\fs1812_new\authmain.php on line 18

This one works OK:
  $query = "SELECT * FROM user";
  $result = mysql_query($query, $link);
  $num_rows = mysql_num_rows($result);

What is wrong and how can I use mysql_num_rows when the query include

A fast response will be very much appreciated.

Arne Essa Madsen;

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