我无法解决的SQL错误

Question

i am new to php and do not know how to fix the following error:

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in E:\webareas\hj942\CW\Website\Login\incorrect.php on line 15

I have a users table with a role that consists of a normaluser and a chairperson. I am trying to only select all from the users table where the role is normaluser. I am getting the error message above. My php code is as follows:

<?php
include("../includes/db.php");

$username=$_POST['username'];
$password=$_POST['password'];

$username = stripslashes($username);
$password = stripslashes($password);
$username = mysql_real_escape_string($username);
$password = mysql_real_escape_string($password);

$sql="SELECT * FROM Users WHERE username='$username' and password='$password' And role = normaluser";
$result=mysql_query($sql);

$count=mysql_num_rows($result);

if($count==1){
session_register("username");
session_register("password");
header("location:myaccount.php");
}

?>

Thank you very much for any help provided.

Answer 1

Try this:

$sql="SELECT * FROM Users WHERE username='$username' and password='$password' And role = 'normaluser'";

i.e: quoting the role value. See if that works...