And then, when using the dependency in a *path operation function*, we declare it with the type `Session` we imported directly from SQLAlchemy.

This will then give us better editor support inside the *path operation function*, because the editor will know that the `db` parameter is of type `Session`:

=== "Python 3.9+"

    ```Python hl_lines="22  30  36  45  51"
    {!> ../../../docs_src/sql_databases/sql_app_py39/main.py!}

!!! note "Hinweis"
    FastAPI weiß nur dank des definierten Defaultwertes `=None`, dass der Wert von `q` nicht erforderlich ist

    `Union[str, None]` hingegen erlaubt ihren Editor, Sie besser zu unterstützen und Fehler zu erkennen.

## Zusätzliche Validierung

Wir werden bewirken, dass, obwohl `q` optional ist, wenn es gegeben ist, **seine Länge 50 Zeichen nicht überschreitet**.

errors.design_file_name_is_invalid = 파일 이름이 잘못되었습니다.
errors.design_file_is_unsupported_type =이 파일 형식은 지원되지 않습니다.
errors.failed_to_create_crawling_config_at_wizard = 크롤링 설정의 작성에 실패했습니다.
errors.design_editor_disabled =이 기능은 사용할 수 없습니다.
errors.not_found_on_file_system = 찾을 수 없습니다. 원인 : {0}
errors.could_not_open_on_system = {0}을 열 수 없습니다. <br> 파일이 응용 프로그램과 연결되어 있는지 확인하십시오.
errors.result_size_exceeded = 더 이상 결과를 표시 할 수 없습니다.

    link: https://fullstackstation.com/fastapi-trien-khai-bang-docker/
    title: 'FASTAPI: TRIỂN KHAI BẰNG DOCKER'
  Taiwanese:
  - author: Leon
    author_link: http://editor.leonh.space/
    link: https://editor.leonh.space/2022/tortoise/
    title: 'Tortoise ORM / FastAPI 整合快速筆記'
Podcasts:
  English:
  - author: Real Python
    author_link: https://realpython.com/

    # XXX: if you enable this setting, unparam will report a lot of false-positives in text editors:
    # if it's called for subdir of a project it can't find external interfaces. All text editor integrations
    # with golangci-lint call it on a directory with the changed file.
    check-exported: false
  gci:
    sections:

errors.design_file_name_is_invalid=The file name is invalid.
errors.design_file_is_unsupported_type=The kind of file is unsupported.
errors.failed_to_create_crawling_config_at_wizard=Failed to create a crawling config.
errors.design_editor_disabled=This feature is disabled.
errors.not_found_on_file_system=Not Found: {0}
errors.could_not_open_on_system=Could not open {0}. <br/>Please check if the file is associated with an application.

errors.design_file_name_is_invalid=The file name is invalid.
errors.design_file_is_unsupported_type=The kind of file is unsupported.
errors.failed_to_create_crawling_config_at_wizard=Failed to create a crawling config.
errors.design_editor_disabled=This feature is disabled.
errors.not_found_on_file_system=Not Found: {0}
errors.could_not_open_on_system=Could not open {0}. <br/>Please check if the file is associated with an application.

errors.design_file_is_unsupported_type=Die Dateiart wird nicht unterstützt.
errors.failed_to_create_crawling_config_at_wizard=Erstellung der Crawling-Konfiguration fehlgeschlagen.
errors.design_editor_disabled=Diese Funktion ist deaktiviert.
errors.not_found_on_file_system=Nicht gefunden: {0}
errors.could_not_open_on_system=Konnte {0} nicht öffnen. <br/>Bitte prüfen, ob die Datei mit einer Anwendung verknüpft ist.

        Prefer to use the `Annotated` version if possible.

    ```Python hl_lines="19"
    {!> ../../../docs_src/dependencies/tutorial003.py!}
    ```

But declaring the type is encouraged as that way your editor will know what will be passed as the parameter `commons`, and then it can help you with code completion, type checks, etc:

<img src="/img/tutorial/dependencies/image02.png">

## Shortcut

        Bevorzugen Sie die `Annotated`-Version, falls möglich.

    ```Python hl_lines="19"
    {!> ../../../docs_src/dependencies/tutorial003.py!}
    ```

Es wird jedoch empfohlen, den Typ zu deklarieren, da Ihr Editor so weiß, was als Parameter `commons` übergeben wird, und Ihnen dann bei der Codevervollständigung, Typprüfungen, usw. helfen kann:

<img src="/img/tutorial/dependencies/image02.png">

## Abkürzung