{* ../../docs_src/query_params_str_validations/tutorial006c_an_py310.py hl[9] *}

## Query-Parameter-Liste / Mehrere Werte { #query-parameter-list-multiple-values }

Wenn Sie einen Query-Parameter explizit mit `Query` definieren, können Sie ihn auch so deklarieren, dass er eine Liste von Werten empfängt, oder anders gesagt, dass er mehrere Werte empfangen kann.

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Die App mit mehreren Modellen aktualisieren { #update-the-app-with-multiple-models }

Jetzt lassen Sie uns diese App ein wenig **refaktorisieren**, um die **Sicherheit** und **Vielseitigkeit** zu erhöhen.

Но во многих случаях вы захотите одновременно запустить несколько процессов‑воркеров.

### Несколько процессов — Воркеры { #multiple-processes-workers }

// Add support for large number arithmetic.

// Supported arithmetic operators
const (
	opPlus     = "+"
	opMinus    = "-"
	opDivide   = "/"
	opMultiply = "*"
	opModulo   = "%"
)

// For arithmetic operations, if both values are numeric then the
// operation shall succeed. If the types are unknown automatic type
// conversion to a number is attempted.

    } catch (Throwable e) {
      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

  /**
   * Concatenates multiple {@link ByteSource} instances into a single source. Streams returned from
   * the source will contain the concatenated data from the streams of the underlying sources.
   *

   *         .putAll("several", 1, 2, 3)
   *         .putAll("many", 1, 2, 3, 4, 5)
   *         .build();
   * }
   *
   * <p>Builder instances can be reused; it is safe to call {@link #build} multiple times to build
   * multiple multimaps in series. Each multimap contains the key-value mappings in the previously
   * created multimaps.
   *
   * @since 2.0
   */
  @DoNotMock
  public static class Builder<K, V> {

    if not fields:
        return False
    # More than one dependency could have the same field, it would show up as multiple
    # fields but it's the same one, so count them by name
    body_param_names_set = {field.name for field in fields}
    # A top level field has to be a single field, not multiple
    if len(body_param_names_set) > 1:
        return True
    first_field = fields[0]

	return &StreamTypeHandler[Payload, Req, Resp]{id: h, InCapacity: 1, OutCapacity: 1}
}

// Register a handler for two-way streaming with payload, input stream and output stream.
// An optional subroute can be given. Multiple entries are joined with '/'.
func (h *StreamTypeHandler[Payload, Req, Resp]) Register(m *Manager, handle func(ctx context.Context, p Payload, in <-chan Req, out chan<- Resp) *RemoteErr, subroute ...string) error {

///

/// warning | Advertencia

Puedes declarar múltiples parámetros `Form` en una *path operation*, pero no puedes también declarar campos `Body` que esperas recibir como JSON, ya que el request tendrá el body codificado usando `application/x-www-form-urlencoded` en lugar de `application/json`.

            // Then
            assertEquals(0, opnum, "Opnum should always be 0 for bind messages");
        }

        @Test
        @DisplayName("getOpnum should be consistent across multiple calls")
        void testGetOpnumConsistency() {
            // When
            int opnum1 = bind.getOpnum();
            int opnum2 = bind.getOpnum();
            int opnum3 = bind.getOpnum();