PHP MySQL error: supplied argument is not a valid MySQL result resource

[Mubs]

Hi,

I 'am trying to connect my sql database with my webpage for users log in. i have got this script so far but i keep getting the following error message which i cannot figure out..

could any1 help..

 error:Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\xampp\htdocs\checklogin.php on line 18
Wrong Username or Password
 

code:

<?
 
$hostname_mysql_connect = "localhost";
$database_mysql_connect = "website_members";
$username_mysql_connect = "root";
$password_mysql_connect = "******";
$tblname_mysql_connect ="members";
 
$mysql_connect = mysql_pconnect($hostname_mysql_connect, $username_mysql_connect, $password_mysql_connect, $tblname_mysql_connect) or trigger_error(mysql_error(),E_USER_ERROR); 
mysql_select_db($database_mysql_connect) or die(mysql_error());
 
$myusername = $_POST['myusername'];
$mypassword = $_POST['mypassword'];
 
$sql = "SELECT * FROM $tblname_mysql_connect WHERE username= '$myusername' and password='$mypassword'"; 
$result = mysql_query($sql);
 
 $count = mysql_num_rows($result); (line 18)
if($count==1) {
 session_register("myusername");
 session_register("mypassword");
 header("location:login_success.php");
 }
 else {
 echo "Wrong Username or Password";
 }
 
?>
 

many thanx

[Markus]

On your mysql query add: or die(mysql_error())

$result = mysql_query($sql) or die(mysql_error());
 

At a glance I can't see the problem. Maybe this will give a help.

[Atli]

Hi.

Please use [code] tags when posting your code examples. (See How to ask a question)

[code=php] ...PHP code goes here... [/code]

I've also changed the title of the thread to better describe it's contents.

Thank you.

[Mubs]

On your mysql query add: or die(mysql_error())

$result = mysql_query($sql) or die(mysql_error());
 

At a glance I can't see the problem. Maybe this will give a help.

HI... I tried the following code and i got this for an error:

Unknown column 'password' in 'where clause'

[Mubs]

HI... I tried the following code and i got this for an error:

Unknown column 'password' in 'where clause'

I just figured it out...i mis spelt the password field..

many thanx for all posts..

[Markus]

I just figured it out...i mis spelt the password field..

many thanx for all posts..

Thought it would help.

Remember to use those 'or die(mysql_error())' on your mysql queries!