[PHP] problem z DB Opcje

[shoes]

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in C:\xampp\htdocs\sf_sandbox\apps\myapp\modules\mymodule\templates\zalogowanoSuccess.php on line 105

od strony:

[PHP] pobierz, plaintext 
<?php
$dbhost = "localhost";
$dbuser = "root";
$dbpassword ="krasnal";
$dbdatabase = "sklep";
$db = mysql_connect($dbhost, $dbuser, $dbpassword);
mysql_select_db($dbdatabase, $db); 
$a='wewe';
$sql3 = "SELECT * FROM users WHERE Login=". $a . ";" ;
$result = mysql_query($sql3);
$row4 = mysql_fetch_assoc($result);
if ($row4['UserId']) {
echo 'coo'. $row4['UserId'].  $_SESSION['dana'];
?>
[PHP] pobierz, plaintext