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php/mysql help


darkside92
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i log in to test my login script it gos to run the check_login.php script

and i get this error

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/jaccbpac/public_html/classnest/check_login.php on line 22

Wrong Email Or Password

<?php
	include "db.php";
?>

<?php

	mysql_connect("$host", "$username", "$password")or die("cannot connect");
	mysql_select_db("$db_name")or die("cannot select DB");

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

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

	$sql="SELECT * FROM $tbl_name WHERE email='$email' and password='$password'";
	$result = mysql_query($sql);

	$count = mysql_num_rows($result);
	if($count == 1){
		session_register("email");
		session_register("password");
		header("location:login_success.php");
	}
	else{
		echo "Wrong Email Or Password";
	}
?>

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i log in to test my login script it gos to run the check_login.php script

and i get this error

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/jaccbpac/public_html/classnest/check_login.php on line 22

Wrong Email Or Password

<?php
	include "db.php";
?>

<?php

	mysql_connect("$host", "$username", "$password")or die("cannot connect");
	mysql_select_db("$db_name")or die("cannot select DB");

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

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

	$sql="SELECT * FROM $tbl_name WHERE email='$email' and password='$password'";
	$result = mysql_query($sql);

	$count = mysql_num_rows($result);
	if($count == 1){
		session_register("email");
		session_register("password");
		header("location:login_success.php");
	}
	else{
		echo "Wrong Email Or Password";
	}
?>

It appears that in your sql query you are missing the variable tbl_name. I would try putting that in an seeing if you still get the same error

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Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/jaccbpac/public_html/classnest/check_login.php on line 22

This error typically occurs when there is an error in the query. What you can do is add the following immediately after you execute the query:

if( mysql_errno() > 0 ) {
   print "'" . $sql . "' - ";
   print mysql_error();
   exit;
}

If there is a problem, you will then see the actual mysql error and what the actual query you ran was.

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