/**
* Retrieve a single object by pkey.
*
* @param string $pk the primary key.
* @param PropelPDO $con the connection to use
* @return AppToken
*/
public static function retrieveByPK($pk, PropelPDO $con = null)
{
if (null !== ($obj = AppTokenPeer::getInstanceFromPool((string) $pk))) {
return $obj;
}
$criteria = new Criteria(AppTokenPeer::DATABASE_NAME);
$criteria->add(AppTokenPeer::ID, $pk);
$v = AppTokenPeer::doSelect($criteria, $con);
return !empty($v) > 0 ? $v[0] : null;
}