INFO:     Application startup complete.
```

</div>

<details markdown="1">
<summary>About the command <code>fastapi dev main.py</code>...</summary>

The command `fastapi dev` reads your `main.py` file, detects the **FastAPI** app in it, and starts a server using <a href="https://www.uvicorn.dev" class="external-link" target="_blank">Uvicorn</a>.

By default, `fastapi dev` will start with auto-reload enabled for local development.

</details>

这里，我们使用 `SessionDep` 依赖项（一个 `Session` ）将新的 `Hero` 添加到 `Session` 实例中，提交更改到数据库，刷新 hero 中的数据，并返回它。

### 读取 Hero 类

我们可以使用 `select()` 从数据库中**读取** `Hero` 类，并利用 `limit` 和 `offset` 来对结果进行分页。

{* ../../docs_src/sql_databases/tutorial001_an_py310.py ln[48:55] hl[51:52,54] *}

### 读取单个 Hero

我们可以**读取**单个 `Hero` 。

type BucketAlreadyExists GenericError

func (e BucketAlreadyExists) Error() string {
	return "The requested bucket name is not available. The bucket namespace is shared by all users of the system. Please select a different name and try again."
}

// BucketAlreadyOwnedByYou already owned by you.
type BucketAlreadyOwnedByYou GenericError

func (e BucketAlreadyOwnedByYou) Error() string {

   * supports removal operations if the backing set does. Removal operations write through to the
   * backing set. The returned map does not support put operations.
   *
   * <p><b>Warning:</b> If the function rejects {@code null}, caution is required to make sure the
   * set does not contain {@code null}, because the view cannot stop {@code null} from being added
   * to the set.
   *

   * supports removal operations if the backing set does. Removal operations write through to the
   * backing set. The returned map does not support put operations.
   *
   * <p><b>Warning:</b> If the function rejects {@code null}, caution is required to make sure the
   * set does not contain {@code null}, because the view cannot stop {@code null} from being added
   * to the set.
   *

</details>

여기서 `SessionDep` 의존성 (즉, `Session`)을 사용하여 새로운 `Hero`를 `Session` 인스턴스에 추가하고, 데이터베이스에 변경 사항을 커밋하고, `hero` 데이터의 최신 상태를 갱신한 다음 이를 반환합니다.

### Heroes 조회하기

`select()`를 사용하여 데이터베이스에서 `Hero`를 **조회**할 수 있습니다. 결과에 페이지네이션을 적용하기 위해 `limit`와 `offset`을 포함할 수 있습니다.

{* ../../docs_src/sql_databases/tutorial001_an_py310.py ln[48:55] hl[51:52,54] *}

### 단일 Hero 조회하기

   * @deprecated For Android users, see the <a
   *     href="https://developer.android.com/training/data-storage" target="_blank">Data and File
   *     Storage overview</a> to select an appropriate temporary directory (perhaps {@code
   *     context.getCacheDir()}), and create your own directory under that. (For example, you might

}

func ptr[T any](a T) *T {
	return &a
}

// sleepContext sleeps for d duration or until ctx is done.
func sleepContext(ctx context.Context, d time.Duration) error {
	select {
	case <-ctx.Done():
		return ctx.Err()
	case <-time.After(d):
	}
	return nil
}

// helper type to return either item or error.
type itemOrErr[V any] struct {
	Item V
	Err  error

    // the `keys` and `values` arrays do not need to change. But because the "short hash" now has a
    // different number of bits, we must rewrite each element of `entries` so that its contribution
    // to the full hashcode reflects the change, and so that its `next` link corresponds to the new
    // linked list of entries with the new short hash.
    for (int oldTableIndex = 0; oldTableIndex <= oldMask; oldTableIndex++) {

 * }
 *
 * <p>...returns the ASCII bytes of the string {@code "foo"}.
 *
 * <p>By default, {@code BaseEncoding}'s behavior is relatively strict and in accordance with RFC
 * 4648. Decoding rejects characters in the wrong case, though padding is optional. To modify
 * encoding and decoding behavior, use configuration methods to obtain a new encoding with modified
 * behavior:
 *
 * {@snippet :