Question

Warning: mysql_num_rows() expects parameter 1 to be resource....

Asked by: seeminglylost

I am creating a simple login page using php and MySQL. I am new at this and cannot figure out why I am getting this error:

Warning: mysql_num_rows() expects parameter 1 to be resource, null given in RegisterUser.php on line 53

Unable to execute the query.

Error code 0:

Code that is being referenced is:
[code]
if (mysql_num_rows($QueryResult) > 0) {
[/code]

I am using xampp by apache friends 1.7.2. I have dumped my database and table several times. Everything appears to be as it should but I don't know where I am going wrong.

My table info is:

SQL result

Host: localhost
Database: songorganizer
Generation Time: Nov 07, 2009 at 01:35 AM
Generated by: phpMyAdmin 3.2.0.1 / MySQL 5.1.37
SQL query: show create table registered_users;
Rows: 1
Table registered_users
Create Table
CREATE TABLE `registered_users` (
`ID` smallint(6) NOT NULL AUTO_INCREMENT,
`email` varchar(40) DEFAULT NULL,
`password` varchar(10) DEFAULT NULL,
PRIMARY KEY (`ID`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1

Any ideas where it is that I am going wrong??

<?php
session_start();
if (empty($_GET['email']) || empty($_GET['email_confirm'])
	|| empty($_GET['password']) 
	|| empty($_GET['password_confirm']))
	exit("<p>You must enter values in all fields of the Registration form! Click your browser's Back button to return to the previous page.</p>"); 
else if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $_GET['email']))
	exit("<p>You must enter a valid e-mail address! Click your browser's Back button to return to the previous page.</p>"); 
else if ($_GET['email'] != $_GET['email_confirm'])
	exit("<p>You did not enter the same e-mail address! Click your browser's Back button to return to the previous page.</p>"); 
else if ($_GET['password'] != $_GET['password_confirm'])
	exit("<p>You did not enter the same password! Click your browser's Back button to return to the previous page.</p>"); 
else if (strlen($_GET['password']) < 5 || strlen($_GET['password']) > 10)
	exit("<p>Your password must be between 5 and 10 characters! Click your browser's Back button to return to the previous page.</p>"); 
$DBConnect = @mysql_connect("localhost", "root")
	Or die("<p>Unable to connect to the database server.</p>"
	. "<p>Error code " . mysql_connect_errno()
	. ": " . mysql_connect_error()) . "</p>"; 
// select and create database
$DBName = "songorganizer";
if (!@mysql_select_db($DBName)) {
	$SQLstring = "CREATE DATABASE $DBName";
	$QueryResult = @mysql_query($SQLstring)
		Or die("<p>Unable to execute the query.</p>"
		. "<p>Error code " . mysql_errno($DBConnect)
		. ": " . mysql_error($DBConnect)) . "</p>";
	echo "<p>You entered your first song!</p>";
	mysql_select_db($DBName);
} 
$TableName = "registered_users";
$SQLstring = "SELECT * FROM $TableName";
$QueryResult = @mysql_query($SQLstring);
if (!$QueryResult) {
 	$SQLstring = "CREATE TABLE $TableName (ID SMALLINT NOT NULL AUTO_INCREMENT PRIMARY KEY, email VARCHAR(40), password VARCHAR(10))";
 	$QueryResult = @mysql_query($SQLstring)
 		Or die("<p>Unable to create the table.</p>"
 		. "<p>Error code " . mysql_errno($DBConnect)
 		. ": " . mysql_error($DBConnect)) . "</p>";
}
$TableName = "registered_users";
$Email = addslashes($_GET['email']);
$Password = addslashes($_GET['password']);
$SQLstring = "SELECT * FROM $TableName";
$QueryResult = @mysql_query($DBConnect, $SQLstring); 
if (mysql_num_rows($QueryResult) > 0) {
	$Row = mysql_fetch_row($QueryResult);
	do {
		if (in_array($Email, $Row))
			exit("<p>Hi, the e-mail address you entered is already
registered! Click your browser's Back button to
return to the previous page.</p>");
		$Row = mysql_fetch_row($QueryResult);
	} while ($Row);
	mysql_free_result($QueryResult);
} 
$SQLstring = "INSERT INTO $TableName VALUES(NULL, '$Email',
'$Password')";
$QueryResult = @mysql_query($DBConnect, $SQLstring)
	Or die("<p>Unable to execute the query.</p>"
 		. "<p>Error code " . mysql_errno($DBConnect)
 		. ": " . mysql_error($DBConnect)) . "</p>";
$_SESSION['ID'] = mysql_insert_id($DBConnect);
mysql_close($DBConnect);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>The Song Organizer Site</title><img src="Butterfly/images/header.gif" width="875" height="50" alt="" title="" border="0" align="right" />
<link rel="stylesheet" href="php_styles.css" type="text/css" />
<meta http-equiv="content-type"
      content="text/html; charset=iso-8859-1" />
</head>
<body>
<h1>Song Organizer</h1>
<h2>User Registration</h2>
<p>Your new user ID is <strong>
<?= $_SESSION['userID'] ?></strong>.</p>
<p><a href="UpdateContactInfo.php">Enter Contact Information</a></p>
</body>
</html>

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Asked On: 2009-11-06 at 21:42:13ID24879998
Topics: MySQL Server
,; PHP Scripting Language
Participating Experts: 4
Points: 500
Comments: 12

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Answers

by: seetharamlPosted on 2009-11-06 at 21:54:56ID: 25765154

Hi seeminglylost,

can you remove @ symbol before mysql_quey and let me know what error you get after remove @.

Thanks

by: aisebastianPosted on 2009-11-06 at 23:24:21ID: 25765300

Hi,

You could try to alter line 43 to this:

$SQLstring = "SELECT * FROM `$TableName`";

by: ChrisStanyonPosted on 2009-11-07 at 06:39:33ID: 25766459

Try writing lines 45-55 like this:

while ($Row = mysql_fetch_row($QueryResult))
{
	if (in_array($Email, $Row))
		exit("<p>Hi, the e-mail address you entered is already registered! Click your browser's Back button to return to the previous page.</p>");
}

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by: Ray_PaseurPosted on 2009-11-07 at 07:21:40ID: 25766567

This thing:

Warning: mysql_num_rows() expects parameter 1 to be resource, null given

... means that your query failed. MySQL is not a "black box" and you have to test for query success or failure before you try to use the query resources identifier or the contents of the query results set.

This code snippet shows the correct way to construct and run a query, how to test for success, and how to find out what went wrong if the query failed (if there was a syntax error, if the DB server flipped, etc.) Please read it over carefully - code, comments and the manual page references - and post back here with any questions. I am sure we can get you moving in the right direction ;-)

Best regards, ~Ray

<?php // RAY_mysql_example.php
error_reporting(E_ALL); 
// IMPORTANT PAGES FROM THE MANUALS
// MAN PAGE: http://us2.php.net/manual/en/ref.mysql.php
// MAN PAGE: http://us2.php.net/manual/en/mysql.installation.php
// MAN PAGE: http://us.php.net/manual/en/function.mysql-error.php 

// CONNECTION AND SELECTION VARIABLES FOR THE DATABASE
$db_host = "localhost"; // PROBABLY THIS IS OK
$db_name = "??";        // GET THESE FROM YOUR HOSTING COMPANY
$db_user = "??";
$db_word = "??"; 

// OPEN A CONNECTION TO THE DATA BASE SERVER
// MAN PAGE: http://us2.php.net/manual/en/function.mysql-connect.php
if (!$db_connection = mysql_connect("$db_host", "$db_user", "$db_word"))
{
   $errmsg = mysql_errno() . ' ' . mysql_error();
   echo "<br/>NO DB CONNECTION: ";
   echo "<br/> $errmsg <br/>";
} 
// SELECT THE MYSQL DATA BASE
// MAN PAGE: http://us2.php.net/manual/en/function.mysql-select-db.php
if (!$db_sel = mysql_select_db($db_name, $db_connection))
{
   $errmsg = mysql_errno() . ' ' . mysql_error();
   echo "<br/>NO DB SELECTION: ";
   echo "<br/> $errmsg <br/>";
   die('NO DATA BASE');
}
// IF WE GOT THIS FAR WE CAN DO QUERIES 

// ESCAPING A DATA FIELD FOR USE IN MYSQL QUERIES
// MAN PAGE: http://us2.php.net/manual/en/function.mysql-real-escape-string.php
$safe_username = mysql_real_escape_string($_POST["username"]); 

// CREATING AND SENDING A SELECT QUERY AND TESTING THE RESULTS
// MAN PAGE:http://us2.php.net/manual/en/function.mysql-query.php
$sql = "SELECT id FROM my_table WHERE username='$safe_username'";
$res = mysql_query($sql); 
// IF mysql_query() RETURNS FALSE, GET THE ERROR REASONS
// MAN PAGE: http://us.php.net/manual/en/function.mysql-error.php
if (!$res)
{
   $errmsg = mysql_errno() . ' ' . mysql_error();
   echo "<br/>QUERY FAIL: ";
   echo "<br/>$sql <br/>";
   die($errmsg);
}
// IF WE GET THIS FAR, THE QUERY SUCCEEDED AND WE HAVE A RESOURCE-ID IN $res SO WE CAN NOW USE $res IN OTHER MYSQL FUNCTIONS 

// DETERMINE HOW MANY ROWS OF RESULTS WE GOT
// MAN PAGE: http://us2.php.net/manual/en/function.mysql-num-rows.php
$num = mysql_num_rows($res);
if (!$num)
{
   echo "<br/>QUERY FOUND NO DATA: ";
   echo "<br/>$sql <br/>";
}
else
{
   echo "<br/>QUERY FOUND $num ROWS OF DATA ";
   echo "<br/>$sql <br/>";
} 

// ITERATE OVER THE RESULTS SET TO SHOW WHAT WE FOUND
// MAN PAGE: http://us2.php.net/manual/en/function.mysql-fetch-assoc.php
echo "<pre>\n"; // MAKE IT EASY TO READ
while ($row = mysql_fetch_assoc($res))
{
   var_dump($row); // MAN PAGE: http://us2.php.net/manual/en/function.var-dump.php
}

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by: seeminglylostPosted on 2009-11-07 at 14:15:29ID: 25768303

I want to thank everyone for their responses. With the code snippet that Ray_Paseur I was able to resolve my issues.

The problem that I am having now is that my script is not displaying the information from the MySQL database.

On this particular page that I have included the code snippet for, it should display the userID and it does not.

Any suggestions?

My table info for userID is as follows:

Field Type Null
userID smallint(6) No

and it is set to auto_increment.

<?php
session_start();
if (empty($_GET['email']) || empty($_GET['email_confirm'])
	|| empty($_GET['password']) 
	|| empty($_GET['password_confirm']))
	exit("<p>You must enter values in all fields of the Registration form! Click your browser's Back button to return to the previous page.</p>"); 
else if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $_GET['email']))
	exit("<p>You must enter a valid e-mail address! Click your browser's Back button to return to the previous page.</p>"); 
else if ($_GET['email'] != $_GET['email_confirm'])
	exit("<p>You did not enter the same e-mail address! Click your browser's Back button to return to the previous page.</p>"); 
else if ($_GET['password'] != $_GET['password_confirm'])
	exit("<p>You did not enter the same password! Click your browser's Back button to return to the previous page.</p>"); 
else if (strlen($_GET['password']) < 5 || strlen($_GET['password']) > 10)
	exit("<p>Your password must be between 5 and 10 characters! Click your browser's Back button to return to the previous page.</p>"); 
$DBConnect = @mysqli_connect("localhost", "root")
	Or die("<p>Unable to connect to the database server.</p>"
	. "<p>Error code " . mysqli_connect_errno()
	. ": " . mysqli_connect_error()) . "</p>"; 
$DBName = "songorganizer"; 
@mysqli_select_db($DBConnect, $DBName)
	Or die("<p>Unable to select the database.</p>"
	. "<p>Error code " . mysqli_errno($DBConnect)
	. ": " . mysqli_error($DBConnect)) . "</p>"; 
$TableName = "users";
$Email = addslashes($_GET['email']);
$Password = addslashes($_GET['password']);
$SQLstring = "SELECT * FROM $TableName";
$QueryResult = @mysqli_query($DBConnect, $SQLstring); 
if (mysqli_num_rows($QueryResult) > 0) {
	$Row = mysqli_fetch_row($QueryResult);
	do {
		if (in_array($Email, $Row))
			exit("<p>The e-mail address you entered is already
registered! Click your browser's Back button to
return to the previous page.</p>");
		$Row = mysqli_fetch_row($QueryResult);
	} while ($Row);
	mysqli_free_result($QueryResult);
} 
$SQLstring = "INSERT INTO $TableName VALUES(NULL, '$Email',
'$Password')";
$QueryResult = @mysqli_query($DBConnect, $SQLstring)
	Or die("<p>Unable to execute the query.</p>"
 		. "<p>Error code " . mysqli_errno($DBConnect)
 		. ": " . mysqli_error($DBConnect)) . "</p>";
$_SESSION['userID'] = mysqli_insert_id($DBConnect);
mysqli_close($DBConnect);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>The Song Organizer Site</title>
<link rel="stylesheet" href="php_styles.css" type="text/css" />
<meta http-equiv="content-type"
content="text/html; charset=iso-8859-1" />
</head>
<body>
<h1>Song Organizer</h1>
<h2>User Registration</h2>
<p>Your new user ID is <strong><?= $_SESSION['userID'] ?></strong>.</p>
<p><a href="SongOrganizer.php">User Home Page</a></p>
</body>
</html>

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by: Ray_PaseurPosted on 2009-11-07 at 14:26:22ID: 25768348

Let's start with some basic debugging techniques. First, place this statement right at the top before session_start()

error_reporting(E_ALL);

Next find all those @-signs on the function statements and remove them. The @ suppresses errors, and when you don't know why your script does not work, you very much want to see the errors.

Add in the tests for query success, like shown in lines 41 - 50 of the snippet I posted above. Add this sort of test everywhere you run a query. If you're unsure how to do this, it's OK to refer to the manual pages - there are some differences between mysql and mysqli, but the principles remain the same. You MUST test to see if the query succeeded before you can do anything with the resource or results set.

Please make those changes, work out the parse errors, and run it again then repost the new code, along with any messages that you received when you tried to run the new code. Thanks, ~Ray

by: seeminglylostPosted on 2009-11-07 at 15:19:57ID: 25768558

Ok, I did as you suggested. All of the @ were removed. Placed this statement right at the top before session_start()

error_reporting(E_ALL).

I added in the test for query success. The only error message that came up was:

Deprecated: Function eregi () is deprecated in...

I went through and changed my code accordingly. Ran it. No other errors are being displayed. Page is working fine, except that it is not displaying the userID.

I have added a print screen for the output. The output should be displaying the user ID number and it does not. This is what has me stumped.

Revised code is attached with query tests and @ removed

<?php
error_reporting(E_ALL);
session_start();
if (empty($_GET['email']) || empty($_GET['email_confirm'])
	|| empty($_GET['password']) 
	|| empty($_GET['password_confirm']))
	exit("<p>You must enter values in all fields of the Registration form! Click your browser's Back button to return to the previous page.</p>"); 
else if (!preg_match("^[_a-z0-9-]+(\.[_a-z0-9-]+)*[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$^", $_GET['email']))
	exit("<p>You must enter a valid e-mail address! Click your browser's Back button to return to the previous page.</p>"); 
else if ($_GET['email'] != $_GET['email_confirm'])
	exit("<p>You did not enter the same e-mail address! Click your browser's Back button to return to the previous page.</p>"); 
else if ($_GET['password'] != $_GET['password_confirm'])
	exit("<p>You did not enter the same password! Click your browser's Back button to return to the previous page.</p>"); 
else if (strlen($_GET['password']) < 5 || strlen($_GET['password']) > 10)
	exit("<p>Your password must be between 5 and 10 characters! Click your browser's Back button to return to the previous page.</p>"); 
$DBConnect = mysqli_connect("localhost", "root")
	Or die("<p>Unable to connect to the database server.</p>"
	. "<p>Error code " . mysqli_connect_errno()
	. ": " . mysqli_connect_error()) . "</p>"; 
$DBName = "songorganizer"; 
mysqli_select_db($DBConnect, $DBName)
	Or die("<p>Unable to select the database.</p>"
	. "<p>Error code " . mysqli_errno($DBConnect)
	. ": " . mysqli_error($DBConnect)) . "</p>"; 
$TableName = "users";
$Email = addslashes($_GET['email']);
$Password = addslashes($_GET['password']);
$SQLstring = "SELECT * FROM $TableName";
$QueryResult = mysqli_query($DBConnect, $SQLstring); 
if (mysqli_num_rows($QueryResult) > 0) {
	$Row = mysqli_fetch_row($QueryResult);
	do {
		if (in_array($Email, $Row))
			exit("<p>The e-mail address you entered is already
registered! Click your browser's Back button to
return to the previous page.</p>");
		$Row = mysqli_fetch_row($QueryResult);
	} while ($Row);
	mysqli_free_result($QueryResult);
} 
$SQLstring = "INSERT INTO $TableName VALUES(NULL, '$Email',
'$Password')";
$QueryResult = mysqli_query($DBConnect, $SQLstring)
	Or die("<p>Unable to execute the query.</p>"
 		. "<p>Error code " . mysqli_errno($DBConnect)
 		. ": " . mysqli_error($DBConnect)) . "</p>";
$_SESSION['userID'] = mysqli_insert_id($DBConnect);
mysqli_close($DBConnect);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>The Song Organizer Site</title>
<link rel="stylesheet" href="php_styles.css" type="text/css" />
<meta http-equiv="content-type"
content="text/html; charset=iso-8859-1" />
</head>
<body>
<h1>Song Organizer</h1>
<h2>User Registration</h2>
<p>Your new user ID is <strong><?= $_SESSION['userID'] ?></strong>.</p>
<p><a href="SongOrganizer.php">User Home Page</a></p>
</body>
</html>

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untitled.bmp
- 1.4 MB
screenshot

by: Ray_PaseurPosted on 2009-11-07 at 15:50:19ID: 25768677

Great - that is progress. Now we want to add logic and data visualization to the script. Right before executing each query, add an echo statement to print out the contents of the query. For example, between lines 28 and 29, print out the variable $SQLstring so we can see what is being passed to the query function. Do this for each of the queries. It will help us to see what is getting created in the query strings and will help us follow the program logic flow through the code.

Finally, please change line 62 as follows (you may have short-tags turned off):

<p>Your new user ID is <strong><?php echo "{$_SESSION['userID']}"; ?></strong>.</p>

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by: seeminglylostPosted on 2009-11-07 at 17:31:18ID: 25768975

Ok...everything now works.

I do have one question. If I change everything that has mysqli to mysql, it cannot connect to the database. If I change it back to mysql, it works. Can you explain to me why this is?

by: Ray_PaseurPosted on 2009-11-07 at 18:55:00ID: 25769237

Sort of - mysqli and mysql do many of the same things, but use different syntax, sometimes with operands in different order. And mysqli is mostly intended to be object-oriented. That is probably your issue. If you are curious, you can look the functions up on the PHP.net web site.

http://us.php.net/manual/en/function.mysql-connect.php
http://us.php.net/manual/en/mysqli.connect.php

Best regards, ~Ray

by: seeminglylostPosted on 2009-11-07 at 20:37:59ID: 31651322

Thanks so very much Ray! I have bookmarked the links you provided for future reference!

by: Ray_PaseurPosted on 2009-11-08 at 06:18:04ID: 25770545

Thanks for the points - a good question, for sure! ~Ray

20120131-EE-VQP-002

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