/**
  * Returns TRUE if a transaction is in progress, FALSE else
  * @return boolean TRUE if a transaction is in progress, FALSE else
  */
 public static function isTransactionInProgress()
 {
     return DatabaseConnectionModel::isTransactionEnabled();
 }
 /**
  * Disables transactional mode for all DB connections. Called after commit or rollback.
  */
 private static function unsetTransaction()
 {
     DatabaseConnectionModel::$isTransactionEnabled = FALSE;
 }