code: def dbMath(self, typ, field, op, value):
          
          ops = orb.Query.Math(op)
          format = self.MathMap.get(typ, {}).get(ops) or self.MathMap.get('Default').get(ops) or '{field}'
          return format.format(field=field, value=value)
docs: Performs some database math on the given field.  This will be database specific
          implementations and should return the resulting database operation.
  
          :param field: <str>
          :param op: <orb.Query.Math>
          :param target: <variant>
          :param context: <orb.Context> || None
  
          :return: <str>