docs: def rollback(self):
  		"""
  		Rollback MySQL Transaction to database.
  		MySQLDB: If the database and tables support transactions, this rolls 
  		back (cancels) the current transaction; otherwise a 
  		NotSupportedError is raised.
  		
  		@author: Nick Verbeck
  		@since: 5/12/2008
  		"""
  		try:
  			if self.connection is not None:
  				self.connection.rollback()
  				self._updateCheckTime()
  				self.release()
  		except Exception, e:
  			pass