Question

checking mysql db - trying to validate if email_address DOES NOT exist in db

Asked by: phillystyle123

so, i'm trying to check if my email address DOES NOT exist in my db. if it doesn't, i want to not submit the form - i'm using the exact opposite query/logic on another page and it works fine - but when i use the following logic, my form still submits

here's my query - below is the entire chunk of code:


SELECT email_address FROM users WHERE email_address NOT LIKE '%s'"

// Needs better checking ;)
 
      if (!ereg('.*@.*\..{2,4}', $values['email_address'])){
 
      $errors['email_address'] = '<div class="required">Invalid email address</div>';
          } else {
 
	  
	 //begin check for duplicate email addresses
	 
	 require_once('Connections/connSmartBenefit.php'); 
	$colname_result = "-1";
if (isset($_POST['email_address'])) {
  $colname_result = (get_magic_quotes_gpc()) ? $_POST['email_address'] : addslashes($_POST['email_address']);
}
mysql_select_db($database_connSmartBenefit, $connSmartBenefit);
$query_result = sprintf("SELECT email_address FROM users WHERE email_address NOT LIKE '%s'", $colname_result);
$result = mysql_query($query_result, $connSmartBenefit) or die(mysql_error());
$row_result = mysql_fetch_assoc($result);
$totalRows_result = mysql_num_rows($result);
        
        if ((mysql_num_rows($result)==1)&&(!empty($result)))
 
       $errors['email_address2'] = '<div class="required">We do not have a record of this email address. <br />Please <a href="onClick="history.back()">click here</a> to go enter another email address OR <a href="register.php">click here</a> to register.</div>';
	   //end check for duplicate email addresses
 
       
}

                                  
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Asked On
2009-09-02 at 13:41:28ID24702751
Topic

PHP Scripting Language

Participating Experts
1
Points
250
Comments
5

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Answers

 

by: pmessanaPosted on 2009-09-02 at 13:46:26ID: 25245538

Couple of things, why are you using NOT LIKE?  If the email address isn't there why not use WHERE email_address != '%s'?

Since you have LIKE it would assume you wanted to check for a partial match, but you aren't doing that since there are no wildcards, thus you should switch it.

You say it is not working, what part is not working?  If the query is running are you able to run the exact query in MySQL and see the results?  

Also, you have if the number of rows =1 then post a message "We do not have an address" except you will never have a row if the address doesn't exist, which is probably where you are seeing the logic go astray.  You will want to check for where the number of rows = 0, thus you don't have that address in there.

 

by: phillystyle123Posted on 2009-09-02 at 14:08:02ID: 25245703

thanks so much for the pointers - my form is still submitting though - please take a look

 //begin check for duplicate email addresses
	 
	 require_once('Connections/connSmartBenefit.php'); 
	$colname_result = "-1";
if (isset($_POST['email_address'])) {
  $colname_result = (get_magic_quotes_gpc()) ? $_POST['email_address'] : addslashes($_POST['email_address']);
}
mysql_select_db($database_connSmartBenefit, $connSmartBenefit);
$query_result = sprintf("SELECT email_address FROM users WHERE email_address != '%s'", $colname_result);
$result = mysql_query($query_result, $connSmartBenefit) or die(mysql_error());
$row_result = mysql_fetch_assoc($result);
$totalRows_result = mysql_num_rows($result);
        
        if ((mysql_num_rows($result)==0)&&(!empty($result)))
 
       $errors['email_address2'] = '<div class="required">We do not have a record of this email address. <br />Please <a href="onClick="history.back()">click here</a> to go enter another email address OR <a href="register.php">click here</a> to register.</div>';
	   //end check for duplicate email addresses

                                              
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by: pmessanaPosted on 2009-09-02 at 14:09:39ID: 25245723

You say your form is posting, that is a bit misleading to me, you are checking for the duplication after the form has already posted, this code looks to be at the top of the same page or at the top of another page that is interupting the results and then doing something.

What is the second half of that IF statement, the portion where there is a duplication, what is the code supposed to do if it is duplicated?

 

by: pmessanaPosted on 2009-09-02 at 14:18:27ID: 25245787

Couple of other things I see wrong.

This line is incorrect and will always be true, regardless of the results.

if ((mysql_num_rows($result)==0)&&(!empty($result)))


You only need:
if (mysql_num_rows($result)==0)

The result will always be filled with something so long as the query executed, it is only looking to see if you have a link, you have a link or you will have a different issue.

Additionally, you are assigning $totalRows_result = mysql_num_rows($result);

For simplicity sake, use if ($totalRows_result==0)

 

by: phillystyle123Posted on 2009-09-02 at 14:46:09ID: 25245981

turns out the logic was built into the script elsewhere.

$query_result = sprintf("SELECT email_address, `password`, first_name FROM users WHERE email_address LIKE '%%%s%%'", $colname_result);
$result = mysql_query($query_result);
$row_result = mysql_fetch_assoc($result);
$totalRows_result = mysql_num_rows($result);
$email_address = $row_result['email_address'];
$first_name = $row_result['first_name'];
$password = $row_result['password'];
$res = mysql_query($query_result);
if($res) {
  $msg = "Hello $first_name,\n\nPlease use the following email address and password to log in to SmartBenefit.\n\nEmail address: $email_address\nPassword: $password";
  $res = @mail($email_address,'SmartBenefit.com Registration',$msg);
  if(!$res)
    echo '';
} else
  echo 'Bad sql: '.$query_result."\n".mysql_error();  # debug, remove in production code

       

      // Replace with actual page or redirect :P

if(!$res)
    echo 'The email address you provided is not in our records. Please <A HREF="javascript:history.go(-1)">
click here</a> to enter another email address or <a href="register.php">register now</a>.';
      else

      echo "<html xmlns=\"http://www.w3.org/1999/xhtml\">
<head>.....

20120131-EE-VQP-002

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