Snippets File Management
File Management
Username Duplicate
by: Jonathan Finnecy
|
December 14, 2000
Version: 1.1
Type: Sample Code (HOWTO)
Category: File Management
License: GNU General Public License
Description: This simple little snippet will check your table to ensure that duplicate entries of form data will not be entered. This example is for a username check, but obviously can be used for most any form entry information.
// Here is the same code written for PostgreSQL.
// Also, the logic is a little clearer... rather than "if (!$numrows < 1)",
// you can simply use "if ($numrows)" which gives you the same result but a lot
// clearer to the reader (unless you are checking for numrows of -1 - which
// pgSQL doesn't return to my knowledge)
// Feel free to add error checking according to your whims, of course.
// $conn is your open database connection.
$result = pg_exec($conn,"SELECT userid FROM users WHERE userid = '$uid'");
if (pg_numrows($result)) {
echo "That user is already registered in the database.<br>\n";
}
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