PHP - Warning: Mysql_num_rows(): Supplied Argument Is Not A Valid Mysql Result Resourc

Hi, I am having an issue with a piece of code. I am getting the following error, any ideas please?

Quote

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in ...


Code: [Select]
<?php
include "scripts/connect.php";

$last = $_GET['ref']; // This will be the ID of the page

echo "the ref number is $last";

$query = mysql_query("SELECT * FROM news WHERE `ref` = '$last'");

if(mysql_num_rows($query)==0){

die("Something went wrong, contact Administrator!");

  }else{
 
while($info = mysql_fetch_array($query)){
$title = $info ['title'];

echo "<p><a href=\"..news.php\" target=\"_blank\">$title >></a></p>";

}
}
?>

Hi all, complete newbie here.

i have copied this example php code to insert data and a picture into a mysql database. however i get this error.

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource

can be seen here : http://wycombedjs.co.uk/mix/sqltest.php

Any help would be much appreciated.. thanks


Code: [Select]
<?php
$db_host = 'xxx'; // don't forget to change 
$db_user = 'xxx'; 
$db_pwd = 'xxx';

$database = 'mixdb';
$table = 'ae_gallery';
// use the same name as SQL table

$password = '123';
// simple upload restriction,
// to disallow uploading to everyone


if (!mysql_connect($db_host, $db_user, $db_pwd))
    die("Can't connect to database");

if (!mysql_select_db($database))
    die("Can't select database");

// This function makes usage of
// $_GET, $_POST, etc... variables
// completly safe in SQL queries
function sql_safe($s)
{
    if (get_magic_quotes_gpc())
        $s = stripslashes($s);

    return mysql_real_escape_string($s);
}

// If user pressed submit in one of the forms
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
    // cleaning title field
    $title = trim(sql_safe($_POST['title']));

    if ($title == '') // if title is not set
        $title = '(empty title)';// use (empty title) string

    if ($_POST['password'] != $password)  // cheking passwors
        $msg = 'Error: wrong upload password';
    else
    {
        if (isset($_FILES['photo']))
        {
            @list(, , $imtype, ) = getimagesize($_FILES['photo']['tmp_name']);
            // Get image type.
            // We use @ to omit errors

            if ($imtype == 3) // cheking image type
                $ext="png";   // to use it later in HTTP headers
            elseif ($imtype == 2)
                $ext="jpeg";
            elseif ($imtype == 1)
                $ext="gif";
            else
                $msg = 'Error: unknown file format, .png, .jpeg, .gif only!';

            if (!isset($msg)) // If there was no error
            {
                $data = file_get_contents($_FILES['photo']['tmp_name']);
                $data = mysql_real_escape_string($data);
                // Preparing data to be used in MySQL query

                mysql_query("INSERT INTO {$table}
                                SET ext='$ext', title='$title',
                                    data='$data'");

                $msg = 'Success: image uploaded to Mix db';
            }
        }
        elseif (isset($_GET['title']))      // isset(..title) needed
            $msg = 'Error: file not loaded';// to make sure we've using
                                            // upload form, not form
                                            // for deletion


        if (isset($_POST['del'])) // If used selected some photo to delete
        {                         // in 'uploaded images form';
            $id = intval($_POST['del']);
            mysql_query("DELETE FROM {$table} WHERE id=$id");
            $msg = 'Photo deleted';
        }
    }
}
elseif (isset($_GET['show']))
{
    $id = intval($_GET['show']);

    $result = mysql_query("SELECT ext, UNIX_TIMESTAMP(image_time), data
                             FROM {$table}
                            WHERE id=$id LIMIT 1");

    if (mysql_num_rows($result) == 0)
        die('no image');

    list($ext, $image_time, $data) = mysql_fetch_row($result);

    $send_304 = false;
    if (php_sapi_name() == 'apache') {
        // if our web server is apache
        // we get check HTTP
        // If-Modified-Since header
        // and do not send image
        // if there is a cached version

        $ar = apache_request_headers();
        if (isset($ar['If-Modified-Since']) && // If-Modified-Since should exists
            ($ar['If-Modified-Since'] != '') && // not empty
            (strtotime($ar['If-Modified-Since']) >= $image_time)) // and grater than
            $send_304 = true;                                     // image_time
    }


    if ($send_304)
    {
        // Sending 304 response to browser
        // "Browser, your cached version of image is OK
        // we're not sending anything new to you"
        header('Last-Modified: '.gmdate('D, d M Y H:i:s', $ts).' GMT', true, 304);

        exit(); // bye-bye
    }

    // outputing Last-Modified header
    header('Last-Modified: '.gmdate('D, d M Y H:i:s', $image_time).' GMT',
            true, 200);

    // Set expiration time +1 year
    // We do not have any photo re-uploading
    // so, browser may cache this photo for quite a long time
    header('Expires: '.gmdate('D, d M Y H:i:s',  $image_time + 86400*365).' GMT',
            true, 200);

    // outputing HTTP headers
    header('Content-Length: '.strlen($data));
    header("Content-type: image/{$ext}");

    // outputing image
    echo $data;
    exit();
}
?>
<html><head>
<title>MySQL Blob Image Gallery Example</title>
</head>
<body>
<?php
if (isset($msg)) // this is special section for
                 // outputing message
{
?>
<p style="font-weight: bold;"><?=$msg?>
<br>
<a href="<?=$PHP_SELF?>">reload page</a>
<!-- I've added reloading link, because
     refreshing POST queries is not good idea -->
</p>
<?php
}
?>
<h1>Blob image gallery</h1>
<h2>Uploaded images:</h2>
<form action="<?=$PHP_SELF?>" method="post">
<!-- This form is used for image deletion -->

<?php
$result = mysql_query("SELECT id, image_time, title FROM {$table} ORDER BY id DESC");
if (mysql_num_rows($result) == 0) // table is empty
    echo '<ul><li>No images loaded</li></ul>';
else
{
    echo '<ul>';
    while(list($id, $image_time, $title) = mysql_fetch_row($result))
    {
        // outputing list
        echo "<li><input type='radio' name='del' value='{$id}'>";
        echo "<a href='{$PHP_SELF}?show={$id}'>{$title}</a> &ndash; ";
        echo "<small>{$image_time}</small></li>";
    }

    echo '</ul>';

    echo '<label for="password">Password:</label><br>';
    echo '<input type="password" name="password" id="password"><br><br>';

    echo '<input type="submit" value="Delete selected">';
}
?>

</form>
<h2>Upload new image:</h2>
<form action="<?=$PHP_SELF?>" method="POST" enctype="multipart/form-data">
<label for="title">Title:</label><br>
<input type="text" name="title" id="title" size="64"><br><br>

<label for="photo">Photo:</label><br>
<input type="file" name="photo" id="photo"><br><br>

<label for="password">Password:</label><br>
<input type="password" name="password" id="password"><br><br>

<input type="submit" value="upload">
</form>
</body>
</html>

some please help - basically have a simple password change php page

$sql="UPDATE t_members SET Password = '$New_Password' WHERE Username = '$My_Username' AND  Password = '$Old_Password'";
   
   echo $sql;
   
   $result=mysql_query($sql) or die(mysql_error());
   $firstcount = mysql_num_rows($result);

and i get this annoying error Warning: mysql_num_rows(): supplied argument is not a valid

the sql statement works as i see it updating the database correctly

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource on line 14.

<?PHP
require_once("dbcheck.php");
require_once("check.php");
$Username=$_COOKIE['Username'];
$Password=$_COOKIE['Password'];
$Nickname=$_COOKIE['Nickname'];
$Username=mysql_real_escape_string($Username);
$Password=mysql_real_escape_string($Password);

date_default_timezone_set('Asia/Calcutta');

$action = $_GET['do'];
$Result=mysql_query("SELECT * FROM Checks WHERE UserName='$Username'");
$Rowexist=mysql_num_rows($Result);
if($Rowexist!=0){
while($Rows=mysql_fetch_array($Result))
{
$Serial    = $Rows['Serial'];
$Banned    = $Rows['Banned'];
$IP       = $Rows['IP'];
$Used       = $Rows['Used'];
$First       = $Rows['First'];
$Duration    = $Rows['Duration'];
$Total       = $Rows['Total'];
$Time       = $Rows['Time'];
}
if($action=="" || $action=="Banlist"){
mysql_query("UPDATE Checks SET NickName='$Nickname' WHERE UserName='$Username'");
?>

Hi everyone!

I have the following error message:

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /hermes/bosweb25a/b109/ipg.removalspacecom/checklogin.php on line 47
 Wrong Username or Password

by using the below code:

Code: [Select]
<?PHP

 include ('db.php');

// Define $username and $password
$username=$_POST['username'];
$password=$_POST['password'];

// To protect MySQL injection (more detail about MySQL injection)
$username = stripslashes($username);
$password = stripslashes($password);
$username = mysql_real_escape_string($username);
$password = mysql_real_escape_string($password);

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

// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $username and $password, table row must be 1 row

if($count==1){
// Register $username, $password and redirect to file "login_success.php"
session_register("username");
session_register("password");
header("location:login_success.php");
}
else {
echo "Wrong Username or Password";
}

ob_end_flush();
?>

Does anyone have an idea of whats happening? from a guess it's looking for the username and password in the database, but i've made sure that this username and password in IN the correct fields in the table ect??

Thanks