code: @Override
      public synchronized int executeUpdate(final Expression query) throws DatabaseEngineException {
          /*
           * Reconnection is already assured by "void executeUpdate(final String query)".
           */
          final String trans = translate(query);
          logger.trace(trans);
          return executeUpdate(trans);
      }
docs: Executes the given update.
  
  @param query The update to execute.
  @throws DatabaseEngineException If something goes wrong executing the update.