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04.24.2008 at 09:55AM PDT, ID: 23351003
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6.6

Prevent duplicate emails in sign up form

Asked by cathyc77 in MySQL Server, Macromedia Dreamweaver

Tags: ,

I have created a sign up form where the user enters his / her email address which will then get stored in a sql database. How can  I create a message saying "you have already signed up" and prevent duplicate entries?
I have attached my code. Please let me know if you need more info.
thanks very much!Start Free Trial 
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if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
 
  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);
 
  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}
 
$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
  $editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}
 
if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "newsletter")) {
  $insertSQL = sprintf("INSERT INTO SignUp (email) VALUES (%s)",
                       GetSQLValueString($_POST['email'], "text"));
 
  mysql_select_db($database_newsletter, $newsletter);
  $Result1 = mysql_query($insertSQL, $newsletter) or die(mysql_error());
 
  $insertGoTo = "thankyou.php";
  if (isset($_SERVER['QUERY_STRING'])) {
    $insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
    $insertGoTo .= $_SERVER['QUERY_STRING'];
  }
  header(sprintf("Location: %s", $insertGoTo));
}
[+][-]04.24.2008 at 10:09AM PDT, ID: 21433021

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[+][-]04.24.2008 at 10:17AM PDT, ID: 21433086

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[+][-]04.24.2008 at 10:35AM PDT, ID: 21433252

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[+][-]04.24.2008 at 10:38AM PDT, ID: 21433283

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[+][-]04.24.2008 at 10:46AM PDT, ID: 21433348

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[+][-]04.24.2008 at 11:12AM PDT, ID: 21433566

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[+][-]04.24.2008 at 11:19AM PDT, ID: 21433624

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[+][-]04.24.2008 at 11:25AM PDT, ID: 21433694

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[+][-]04.24.2008 at 11:31AM PDT, ID: 21433745

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About this solution

Zones: MySQL Server, Macromedia Dreamweaver
Tags: php and mysql, FF and IE
Sign Up Now!
Solution Provided By: slouko
Participating Experts: 2
Solution Grade: A
 
 
[+][-]04.24.2008 at 11:42AM PDT, ID: 21433861

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[+][-]04.24.2008 at 11:54AM PDT, ID: 21433983

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[+][-]04.24.2008 at 12:30PM PDT, ID: 21434308

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[+][-]04.24.2008 at 01:27PM PDT, ID: 21434813

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