# File lib/fog/aws/requests/rds/describe_db_parameter_groups.rb, line 38
        def describe_db_parameter_groups(name=nil, opts={})
          response = Excon::Response.new
          parameter_set = []
          if name
            if server = self.data[:parameter_groups][name]
              parameter_set << server
            else
              raise Fog::AWS::RDS::NotFound.new("DBInstance #{name} not found")
            end
          else
            parameter_set = self.data[:parameter_groups].values
          end
          

          response.status = 200
          response.body = {
            "ResponseMetadata"=>{ "RequestId"=> Fog::AWS::Mock.request_id },
            "DescribeDBParameterGroupsResult" => { "DBParameterGroups" => parameter_set }
          }
          response
        end