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POQuery is working but I get this error - Warning: mysql_numrows() expects parameter 1 to be resource, boolean given
 

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  1. POQuery is working but I get this error - Warning: mysql_numrows() expects parameter 1 to be resource, boolean given
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    <p>I am trying to create a notification message when a new result is added to the database for certain members. I have 3 documents I am using for this, index.tpl, checkmsg.php and functions.php</p> <p><strong>In the index.tpl I have this code :</strong></p> <pre><code>&lt;script&gt; $(document).ready(function(){ var count = 0; setInterval(function() { $.post("checkmsg.php", { countOld: count }, function(data){ if(data == 0) { return; } else { count = data; alert("You have New Messages"); return; } }); }, 1000); }); &lt;/script&gt; </code></pre> <p><strong>In the checkmsg.php I have this:</strong></p> <pre><code>&lt;?php include("functions.php"); dbConnect(); $username = getUsernameByID($userid); if($username = 'None') { die(); } else{ $sql = "SELECT * FROM users WHERE username = $username AND msgs =&gt; 1"; $result = mysql_query($sql); echo $sql; if( !$result ) { // Kill SQL and return error } else { // We will be sending an Old Count via POST $numRows = mysql_num_rows($result); if( $numRows == $_POST['countOld'] ) { // No change echo '0'; } else echo $numRows; } } ?&gt; </code></pre> <p><strong>In functions.php I have:</strong></p> <pre><code>function getUsernameByID($id) { $query = 'SELECT username FROM users WHERE id = '.$id.' AND msgs = '.$GLOBALS['msgs']; $result = mysql_query($query); $num = mysql_numrows($result); // Line 61 if($num != 1) return "None"; else return mysql_result($result, 0); } </code></pre> <p>I added echo $sql; to checkmsgs.php to check if the query is working and it is as it returns this:</p> <pre><code>SELECT * FROM users WHERE username = None AND msgs =&gt; 1 </code></pre> <p>But above this there is an error:</p> <blockquote> <p>Warning: mysql_numrows() expects parameter 1 to be resource, boolean given in functions.php on line 61</p> </blockquote> <p>When I try a simple query in checkmsgs.php like below, everything works including the notification on the index</p> <pre><code>SELECT * from users where msgs = 1; </code></pre> <p>But when I get this error the notification stops working even though the query is showing correctly.</p> <p>What can I do to fix this?</p> <p>Thanks.</p>
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    1. COAssuming that $username is a string value rather than a number or a Boolean, it needs to be wrapped in quotes: this is basic SQL 101 - but if you're only just starting to learn, then I'd recommend learning using prepared statements with PHP's MySQLi or PDO libraries rather than MySQL
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      1. USMark Baker
    2. COI know you've probably heard it all before but stop using mysql_*. Please move onto mysqli_ or PDO, for your own good.
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      1. USAlbzi
    3. COuse die(mysql_error()) with mysql_query execution line in the functions(here getUsernameByID) to see whether it gives any mysql error or not and let us know.
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