Jump to content

Checking Username Exists


Hendz

Recommended Posts

Hi Guys ive given this a go and im continuing to learn php.

I want to check from a login section to see does the username exist in the database.

Ive gotten this far but i feel like im miles away. Any suggestions would be appreciated.

 

<?php require "config.php";

try { $pdo = new PDO("mysql:host=$host", $username, $password, $options);

echo 'DB connected'; }

catch (PDOException $e) { throw new PDOException($e->getMessage(), (int)$e->getCode()); }

$stmt = $pdo->query('SELECT username FROM databasetest.login WHERE username = !null');

while ($row = $stmt->fetch()) {

 

echo "\n" . PHP_EOL;

echo "<br>" . PHP_EOL;

echo $row['username']; }

Link to comment
Share on other sites

        $pwd = password_hash($data['password'], PASSWORD_DEFAULT);
        unset($data['password']);
        try {
            $query = 'INSERT INTO users (fullName, username, status, password, security, email, date_added) VALUES (:fullName, :username, :status, :password, :security, :email, Now())';
            $stmt = Database::pdo()->prepare($query);
            $result = $stmt->execute([':fullName' => $data['fullName'], ':username' => $data['username'], ':status' => $data['status'], ':password' => $this->pwd, ':security' => 'newuser', ':email' => $data['email']]);
        } catch (PDOException $e) {

            /*
             * echo "unique index" . $e->errorInfo[1] . "<br>";
             *
             * An error has occurred if the error number is for something that
             * this code is designed to handle, i.e. a duplicate index, handle it
             * by telling the user what was wrong with the data they submitted
             * failure due to a specific error number that can be recovered
             * from by the visitor submitting a different value
             *
             * return false;
             *
             * else the error is for something else, either due to a
             * programming mistake or not validating input data properly,
             * that the visitor cannot do anything about or needs to know about
             *
             * throw $e;
             *
             * re-throw the exception and let the next higher exception
             * handler, php in this case, catch and handle it
             */

            if ($e->errorInfo[1] === 1062) {
                return false;
            }

            throw $e;
        } catch (Exception $e) {
            echo 'Caught exception: ', $e->getMessage(), "\n"; // Not for a production server:
        }

If you really want to make sure there can be no duplicates then create an unique index for the username and throw an PDO exception if a duplicate is found. Though I think this would only be useful for a busy busy website.

Link to comment
Share on other sites

This thread is more than a year old. Please don't revive it unless you have something important to add.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.