Solved

MSSQL query changed to MySQL shows not valid mysql resource

Posted on 2008-06-12
6
556 Views
Last Modified: 2008-08-05
Alright

I worked on this for hours and I'm stuck. Below I pasted the script from a working MSSQL login which I changed to use with MySQL. I know that there are syntax differences and the hours I spent was replacing some of them in this script but I've got no where.

I keep getting invalid mysql result resource. Usually on ($result=mysql_query($sql);) however it changes to other lines depending the script.

A fix would be great I'm assuming its a quick thing I cant believe I cant get it working from my MySql book and online!
session_start();
  $user="##";
  $host="##";
  $password="##";
  $database="##";
 
mysql_connect("$host", "$user", "$password")or die("cannot connect");
mysql_select_db("$database")or die("cannot select DB");
 
$sql="SELECT * FROM users WHERE username='$_POST[myusername]' AND pass='$_POST[mypassword]'";
$result=mysql_query($sql);
 
// mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
 
if($count==1) //Login details were found so auth
{

Open in new window

0
Comment
Question by:Ryan Bayne
  • 3
  • 3
6 Comments
 
LVL 17

Accepted Solution

by:
nanharbison earned 300 total points
ID: 21774686
If you are using variables for MySQL functions, don't use quotes. So change
mysql_connect("$host", "$user", "$password")
to
mysql_connect($host, $user, $password)
and change this:
$sql="SELECT * FROM users WHERE username='$_POST[myusername]' AND pass='$_POST[mypassword]'";

to this:
$sql="SELECT * FROM users WHERE username='".$_POST['myusername']."' AND pass='".$_POST['mypassword']."'";

because if you are using post and get variables you have to separate them from the code with a double quote and a dot. I also think you need to add single quotes to $_POST[myusername] inside the brackets, the way I did it in the changed version. I always forget if you HAVE to do it.
0
 
LVL 17

Expert Comment

by:nanharbison
ID: 21774689
the use of double and single quotes, and having to set off variables that are in the form $_POST[] and $_SESSION[], etc always slays me!
0
 
LVL 2

Author Comment

by:Ryan Bayne
ID: 21774799
Well your changes are correct and as you will see in my code below I needed to change the quotes.

I've arrived at a point I did reach myself prior to this question but ended up starting again maybe this time you can help me.

// mssql_num_row is counting table row
$count=mysql_num_rows($result);

That line results in... mysql_num_rows(): supplied argument is not a valid MySQL result resource in
I did think there was a different way to do this with mysql but I'm thinking I dreamed that up!

ideas? thanks so far
<?php
//Processes attempted login
//Retrieves users access permission and fowards to required page depending on that users authorisation
session_start();
 
  $user="##";
  $host="##";
  $password="##";
  $database="##";
 
mysql_connect($host, $user, $password)or die("cannot connect");
mysql_select_db("$database")or die("cannot select DB");
 
$sql='SELECT * FROM users WHERE username="$_POST[myusername]" AND pass="$_POST[mypassword]"';
$result=mysql_query($sql);
 
// mssql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
 
		
if($count==1 && $level=='closed')//Send to account closed page
{
	$_SESSION['auth']="yes";
	header("location: index.php?pagecell=closed.php");
}
else if($count==1 && $level=='master')//Send to web master page
{
	$_SESSION['auth']="yes";
	header("location: index.php?pagecell=admin/webmaster.php");
}
else if($count==1 && $level=='admin')//Send to basic admin area
{
	$_SESSION['auth']="yes";
	header("location: index.php?pagecell=closed.php");
}
else if($count==1 && $level=='member')//Send to member page
{
	$_SESSION['auth']="yes";
	header("location: index.php?pagecell=closed.php");
}
else
{
	header("location: index.php?cell=pagecells/loginfail.php");
	exit();
}
 
?> 

Open in new window

0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 
LVL 2

Author Comment

by:Ryan Bayne
ID: 21774882
I think thats it done. Had to mess around with the quotes and stuff a bit more. Actually I better review what I done I cant remember lol

THANKS
<?php
//Processes attempted login
//Retrieves users access permission and fowards to required page depending on that users authorisation
session_start();
 
  $user="root";
  $host="localhost";
  $password="25130217cmt";
  $database="WebTG2008";
 
mysql_connect($host, $user, $password)or die("cannot connect");
mysql_select_db("$database")or die("cannot select DB");
 
$sql='SELECT * FROM users WHERE username="$_POST[myusername]" AND password="$_POST[mypassword]"';
 
$result=mysql_query($sql);
 
// mssql_num_row is counting table row
$count = mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
 
		
if($count==1 && $level=='closed')//Send to account closed page
{
	$_SESSION['auth']="yes";
	header("location: index.php?pagecell=closed.php");
}
else if($count==1 && $level=='master')//Send to web master page
{
	$_SESSION['auth']="yes";
	header("location: index.php?pagecell=admin/webmaster.php");
}
else if($count==1 && $level=='admin')//Send to basic admin area
{
	$_SESSION['auth']="yes";
	header("location: index.php?pagecell=closed.php");
}
else if($count==1 && $level=='member')//Send to member page
{
	$_SESSION['auth']="yes";
	header("location: index.php?pagecell=closed.php");
}
else
{
	header("location: index.php?cell=pagecells/loginfail.php");
	exit();
}
 
?> 

Open in new window

0
 
LVL 2

Author Comment

by:Ryan Bayne
ID: 21774888
oops put database details. dont worry its a test db only on testing environment with no data
0
 
LVL 17

Expert Comment

by:nanharbison
ID: 21777404
So you got the mysql_num_rows to work? You get that error when there is something wrong with the query or there is no data returned. You might be better off saying:
if ($count = mysql_num_rows($result)) {

      do something

}


0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

I use MySQL for many of my development projects in a Windows environment. To manage my databases (and perform queries) for years I used a tool called MySQL administrator.  This tool has since been replaced by MySQL Workbench. So I decided to m…
Introduction Since I wrote the original article about Handling Date and Time in PHP and MySQL (http://www.experts-exchange.com/articles/201/Handling-Date-and-Time-in-PHP-and-MySQL.html) several years ago, it seemed like now was a good time to updat…
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

803 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question