`int | None` 유형으로 설정하면, SQLModel은 해당 열이 SQL 데이터베이스에서 `INTEGER` 유형이며 `NULLABLE` 값이어야 한다는 것을 알 수 있습니다.

* `Field(index=True)`는 SQLModel에 해당 열에 대해 **SQL 인덱스**를 생성하도록 지시합니다. 이를 통해 데이터베이스에서 이 열으로 필터링된 데이터를 읽을 때 더 빠르게 조회할 수 있습니다.

    SQLModel은 `str`으로 선언된 항목이 SQL 데이터베이스에서 `TEXT` (또는 데이터베이스에 따라 `VARCHAR`) 유형의 열로 저장된다는 것을 인식합니다.

### 엔진 생성하기

さらに、Pythonが**データサイエンス**、機械学習、特にディープラーニングの主要言語であるという単純な事実により、FastAPIはデータサイエンス/機械学習のWeb APIおよびアプリケーション (他の多くのアプリケーションとの) に非常によく適合しています。

本番環境でこの並列処理を実現する方法については、[デプロイ](deployment/index.md){.internal-link target=_blank}に関するセクションを参照してください。

## `async` と `await`

現代的なバージョンのPythonには、非同期コードを定義する非常に直感的な方法があります。これにより、通常の「シーケンシャル」コードのように見え、適切なタイミングで「待機」します。

pkg syscall (freebsd-riscv64), type IPMreqn struct #53466
pkg syscall (freebsd-riscv64), type IPMreqn struct, Address [4]uint8 #53466
pkg syscall (freebsd-riscv64), type IPMreqn struct, Ifindex int32 #53466
pkg syscall (freebsd-riscv64), type IPMreqn struct, Multiaddr [4]uint8 #53466
pkg syscall (freebsd-riscv64), type IPv6MTUInfo struct #53466

pkg syscall (netbsd-arm64-cgo), type Inet6Pktinfo struct
pkg syscall (netbsd-arm64-cgo), type Inet6Pktinfo struct, Addr [16]uint8
pkg syscall (netbsd-arm64-cgo), type Inet6Pktinfo struct, Ifindex uint32
pkg syscall (netbsd-arm64-cgo), type InterfaceAddrMessage struct
pkg syscall (netbsd-arm64-cgo), type InterfaceAddrMessage struct, Data []uint8

        socket = socket,
      )
    atomicRequestCount.incrementAndGet()
    requestQueue.add(request)
    dispatcher.dispatch(request)
  }

  /** @param exchangeIndex the index of this request on this connection.*/
  @Throws(IOException::class)
  private fun readRequest(
    socket: MockWebServerSocket,
    connectionIndex: Int,
    exchangeIndex: Int,
  ): RecordedRequest {

        assertEquals("https://www.example.com/page4.html", sitemaps[3].getLoc());
    }

    public void test_parseXmlSitemapsIndex_missingLoc() {
        // Sitemap index with missing loc should skip that entry
        final String xml =
                "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + "<sitemapindex xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">\n"

The main web server to run **FastAPI** applications.

You can also use the `--workers` command line option to have an asynchronous multi-process server.

Check more details in the [Deployment](deployment/index.md){.internal-link target=_blank} section.

///

## Benchmarks and speed { #benchmarks-and-speed }

	const legacyJSON = `{"version":"1.0.1","format":"xl","stat":{"size":2016,"modTime":"2021-10-11T23:40:34.914361617Z"},"erasure":{"algorithm":"klauspost/reedsolomon/vandermonde","data":2,"parity":2,"blockSize":10485760,"index":2,"distribution":[2,3,4,1],"checksum":[{"name":"part.1","algorithm":"highwayhash256S"}]},"minio":{"release":"RELEASE.2019-12-30T05-45-39Z"},"meta":{"X-Minio-Internal-Server-Side-Encryption-Iv":"kInsJB/0yxyz/40ZI+lmQYJfZacDYqZsGh2wEiv+N50=","X-Min...

```Python hl_lines="1  4-6" title="app/dependencies.py"
{!../../docs_src/bigger_applications/app/dependencies.py!}
```

/// tip

我们正在使用虚构的请求首部来简化此示例。

但在实际情况下，使用集成的[安全性实用工具](security/index.md){.internal-link target=_blank}会得到更好的效果。

///

## 其他使用 `APIRouter` 的模块

假设你在位于 `app/routers/items.py` 的模块中还有专门用于处理应用程序中「项目」的端点。

你具有以下*路径操作*：

* `/items/`
* `/items/{item_id}`

    }
    assertEquals((Integer) 30, lastItem);
  }

  /**
   * This tests a special case where removeAt has to trickle an element first down one level from a
   * min to a max level, then up one level above the index of the removed element. It also tests
   * that skipMe in the iterator plays nicely with forgetMeNot.
   */
  public void testIteratorInvalidatingIteratorRemove2() {