code: def dbStore(self, typ, py_value, context=None):
          
          if py_value is None:
              return None
          return self.valueToString(py_value, context=context)
docs: Prepares to store this column for the a particular backend database.
  
          :param backend: <orb.Database>
          :param py_value: <variant>
          :param context: <orb.Context>
  
          :return: <variant>