General idea behind login integration

function integrate_login_external_db($user, $hashed_pwd, $cookietime)
{
    $db = database();
    $request = $db->query('', '
        SELECT username, playername, guid
        FROM the_members_table
        WHERE username = {string:username}
        LIMIT 1'
        array(
            'username' => $user,
        )
    );
    if ($db->num_rows($request) != 1)
        return 'retry';

    $user = $db->fetch_assoc($request);
    $db->free_result($request);

    $request = $db->query('', '
        SELECT id_member
        FROM {db_prefix}members
        WHERE id_member = {int:current_member}',
        array(
            'current_member' => $user['guid'],
        )
    );

    // Members doesn't exist yet
    if ($db->num_rows($request) == 0)
    {
        // create the user (I'm in a hurry now and I don't have time to write the code)
    }

    return '';
}