# SQL (Relational) Databases { #sql-relational-databases }

**FastAPI** doesn't require you to use a SQL (relational) database. But you can use **any database** that you want.

Here we'll see an example using <a href="https://sqlmodel.tiangolo.com/" class="external-link" target="_blank">SQLModel</a>.

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Atualizar o App com Múltiplos Modelos

Agora vamos **refatorar** este app um pouco para aumentar a **segurança** e **versatilidade**.

```

</div>

그런 다음 `/docs` UI로 이동하면, **FastAPI**가 해당 **model들**을 사용하여 API **문서를 생성**하는 것으르 확인할 수 있습니다. 또한 이 모델들은 데이터를 직렬화하고 검증하는 데에도 사용됩니다.

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## 여러 모델로 애플리케이션 업데이트

이제 애플리케이션을 약간 **리팩토링**하여 **보안**과 **유연성**을 개선해 보겠습니다.

이전 애플리케이션의 UI를 보면, 지금까지는 클라이언트가 생성할 `Hero`의 `id`를 직접 지정할 수 있다는 것을 알 수 있습니다. 😱

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Добавление в приложение дополнительных (вспомогательных) моделей

Теперь давайте проведём **рефакторинг** нашего приложения, чтобы сделать его более безопасным и более универсальным.

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Actualizar la App con Múltiples Modelos

Ahora vamos a **refactorizar** un poco esta aplicación para aumentar la **seguridad** y la **versatilidad**.

Dit betekent ook dat je in veel gevallen het object dat je van een request krijgt **direct naar je database** kunt sturen, omdat alles automatisch wordt gevalideerd.

Hetzelfde geldt ook andersom, in veel gevallen kun je dus het object dat je krijgt van de database **direct doorgeven aan de client**.

notify_nats           publish bucket notifications to NATS endpoints
notify_nsq            publish bucket notifications to NSQ endpoints
notify_mysql          publish bucket notifications to MySQL databases
notify_postgres       publish bucket notifications to Postgres databases
notify_elasticsearch  publish bucket notifications to Elasticsearch endpoints
notify_redis          publish bucket notifications to Redis datastores
```

		},
		config.HelpKV{
			Key:             config.NotifyMySQLSubSys,
			Description:     "publish bucket notifications to MySQL databases",
			MultipleTargets: true,
		},
		config.HelpKV{
			Key:             config.NotifyPostgresSubSys,
			Description:     "publish bucket notifications to Postgres databases",
			MultipleTargets: true,
		},
		config.HelpKV{
			Key:             config.NotifyESSubSys,

      advanced/conditional-openapi.md: how-to/conditional-openapi.md
      advanced/extending-openapi.md: how-to/extending-openapi.md
      advanced/testing-database.md: how-to/testing-database.md
  mkdocstrings:
    handlers:
      python:
        options:
          extensions:
          - griffe_typingdoc
          show_root_heading: true
          show_if_no_docstring: true

It's the most popular Python framework and is widely trusted. It is used to build systems like Instagram.

It's relatively tightly coupled with relational databases (like MySQL or PostgreSQL), so, having a NoSQL database (like Couchbase, MongoDB, Cassandra, etc) as the main store engine is not very easy.