## `yield`を持つデータベースの依存関係

例えば、これを使ってデータベースセッションを作成し、終了後にそれを閉じることができます。

レスポンスを送信する前に`yield`文を含む前のコードのみが実行されます。

```Python hl_lines="2 3 4"
{!../../docs_src/dependencies/tutorial007.py!}
```

生成された値は、*path operations*や他の依存関係に注入されるものです:

```Python hl_lines="4"
{!../../docs_src/dependencies/tutorial007.py!}
```

`yield`文に続くコードは、レスポンスが送信された後に実行されます:

```Python hl_lines="5 6"

      if (mappings.containsKey(var)) {
        // Mapping already established
        // This is possible when following both superClass -> enclosingClass
        // and enclosingclass -> superClass paths.
        // Since we follow the path of superclass first, enclosing second,
        // superclass mapping should take precedence.
        return;
      }
      // First, check whether var -> arg forms a cycle

    page.get_by_role("button", name="Try it out").click()
    page.get_by_role("button", name="Execute").click()
    # Manually add the screenshot
    page.screenshot(
        path="docs/en/docs/img/tutorial/separate-openapi-schemas/image02.png"
    )

    # ---------------------
    context.close()
    browser.close()


process = subprocess.Popen(

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package gradlebuild.buildutils.model

        final ListBody body = new ListBody();
        body.id = dictionaryFile.getId();
        body.type = dictionaryFile.getType();
        body.path = dictionaryFile.getPath();
        body.timestamp = dictionaryFile.getTimestamp();
        return body;
    }

Para esos casos, puedes usar un parámetro `Response`.

## Usar un parámetro `Response`

Puedes declarar un parámetro de tipo `Response` en tu *función de la operación de path* (como puedes hacer para cookies y headers).

Y luego puedes establecer el `status_code` en ese objeto de respuesta *temporal*.

```Python hl_lines="1  9  12"
{!../../docs_src/response_change_status_code/tutorial001.py!}

# Custom Response Classes - File, HTML, Redirect, Streaming, etc.

There are several custom response classes you can use to create an instance and return them directly from your *path operations*.

Read more about it in the [FastAPI docs for Custom Response - HTML, Stream, File, others](https://fastapi.tiangolo.com/advanced/custom-response/).

You can import them directly from `fastapi.responses`:

```python
from fastapi.responses import (
    FileResponse,

*-----------------------+---------------+------------+-----------+-----------------------+-----------------------+
|| type                 || classifier   || extension || language || path types           || includesDependencies ||
*-----------------------+---------------+------------+-----------+-----------------------+-----------------------+

  "$PYTHON_BIN" \
    "$TFCI_GIT_DIR/ci/official/utilities/extract_resultstore_links.py" \
    "$TFCI_OUTPUT_DIR/script.log" \
    --print \
    --xml-out-path "$XML_PATH"
}

if grep -q "Streaming build results to" "$TFCI_OUTPUT_DIR/script.log"; then
  resultstore_extract || resultstore_extract_fallback

    page = context.new_page()
    page.goto("http://localhost:8000/docs")
    page.get_by_label("post /heroes/").click()
    # Manually add the screenshot
    page.screenshot(path="docs/en/docs/img/tutorial/sql-databases/image02.png")

    # ---------------------
    context.close()
    browser.close()


process = subprocess.Popen(