我们将`SessionLocal()`请求的创建和处理放在一个`try`块中。

然后我们在finally块中关闭它。

通过这种方式，我们确保数据库会话在请求后始终关闭，即使在处理请求时出现异常也会关闭。

///

### 关于`request.state`

`request.state`是每个`Request`对象的属性。它用于存储附加到请求本身的任意对象，例如本例中的数据库会话。您可以在[Starlette 的关于`Request`state](https://www.starlette.io/requests/#other-state)的文档中了解更多信息。

对于这种情况下，它帮助我们确保在整个请求中使用单个数据库会话，然后关闭（在中间件中）。

### 使用`yield`依赖项与使用中间件的区别

在此处添加**中间件**与`yield`的依赖项的作用效果类似，但也有一些区别：

labels.destinationIndicator=Zielangabe
labels.user_internationaliSDNNumber=Internationale ISDN-Nummer
labels.internationaliSDNNumber=Internationale ISDN-Nummer
labels.user_state=Bundesland
labels.state=Bundesland
labels.user_employeeType=Mitarbeitertyp
labels.employeeType=Mitarbeitertyp
labels.user_facsimileTelephoneNumber=Faxnummer
labels.facsimileTelephoneNumber=Faxnummer
labels.user_postOfficeBox=Postfach

labels.destinationIndicator=destinationIndicator
labels.user_internationaliSDNNumber=internationaliSDNNumber
labels.internationaliSDNNumber=internationaliSDNNumber
labels.user_state=state
labels.state=state
labels.user_employeeType=employeeType
labels.employeeType=employeeType
labels.user_facsimileTelephoneNumber=facsimileTelephoneNumber
labels.facsimileTelephoneNumber=facsimileTelephoneNumber

     * StackOverflowError: We can't reliably call setException(error).
     *
     * - Any kind of Error from a listener. Even if we could distinguish that case (by exposing some
     * extra state from AbstractFuture), our options are limited: A call to setException() would be
     * a no-op. We could log, but if that's what we really want, we should modify

      b.append(longBitsToDouble(longs.get(i)));
      if (i == iMax) {
        return b.append(']').toString();
      }
      b.append(',').append(' ');
    }
  }

  /**
   * Saves the state to a stream (that is, serializes it).
   *
   * @serialData The length of the array is emitted (int), followed by all of its elements (each a
   *     {@code double}) in the proper order.
   */

			t.Errorf("%d. got error = %v; want %v", i, err, tt.wanterr)
		}
	}
}

func TestReaderAtConcurrent(t *testing.T) {
	// Test for the race detector, to verify ReadAt doesn't mutate
	// any state.
	r := NewReader([]byte("0123456789"))
	var wg sync.WaitGroup
	for i := 0; i < 5; i++ {
		wg.Add(1)
		go func(i int) {
			defer wg.Done()
			var buf [1]byte
			r.ReadAt(buf[:], int64(i))
		}(i)
	}

	return s.ztunnelServer.PodAdded(ctx, pod, netns)
}

// ConstructInitialSnapshot takes a "snapshot" of current ambient pods and
//
// 1. Constructs a ztunnel state message to initialize ztunnel
// 2. Syncs the host ipset
func (s *NetServer) ConstructInitialSnapshot(ambientPods []*corev1.Pod) error {
	var consErr []error

  // +optional
  optional string unhealthyPodEvictionPolicy = 4;
}

// PodDisruptionBudgetStatus represents information about the status of a
// PodDisruptionBudget. Status may trail the actual state of a system.
message PodDisruptionBudgetStatus {
  // Most recent generation observed when updating this PDB status. DisruptionsAllowed and other

            result.setRoles(toStringArray(source.get("roles")));
            result.setRoomNumber(DfTypeUtil.toString(source.get("roomNumber")));
            result.setState(DfTypeUtil.toString(source.get("state")));
            result.setStreet(DfTypeUtil.toString(source.get("street")));
            result.setSurname(DfTypeUtil.toString(source.get("surname")));

						}()
					}
				}
				wg.Wait()
				sm.Unlock()
			}
			sTimer.Reset(siteResyncSaveInterval)
		case <-ctx.Done():
			return
		}
	}
}

// update overall site resync state
func (sm *siteResyncMetrics) updateState(s SiteResyncStatus) error {
	if !globalSiteReplicationSys.isEnabled() {
		return nil
	}
	sm.Lock()
	defer sm.Unlock()
	switch s.Status {
	case ResyncStarted: