```Python hl_lines="2-3"
@app.get('/burgers')
async def read_burgers():
    burgers = await get_burgers(2)
    return burgers
```

### 🌅 📡 ℹ

👆 💪 ✔️ 👀 👈 `await` 💪 🕴 ⚙️ 🔘 🔢 🔬 ⏮️ `async def`.

✋️ 🎏 🕰, 🔢 🔬 ⏮️ `async def` ✔️ "⌛". , 🔢 ⏮️ `async def` 💪 🕴 🤙 🔘 🔢 🔬 ⏮️ `async def` 💁‍♂️.

, 🔃 🥚 & 🐔, ❔ 👆 🤙 🥇 `async` 🔢 ❓

```Python hl_lines="4  14  16-22"
{!../../../docs_src/async_sql_databases/tutorial001.py!}
```

!!! tip "提示"

    注意，上例是都是纯 SQLAlchemy Core 代码。

    `databases` 还没有进行任何操作。

## 导入并设置 `databases`

* 导入 `databases`
* 创建 `DATABASE_URL`
* 创建 `database`

```Python hl_lines="3  9  12"
{!../../../docs_src/async_sql_databases/tutorial001.py!}
```

!!! tip "提示"

```Python hl_lines="2-3"
@app.get('/burgers')
async def read_burgers():
    burgers = await get_burgers(2)
    return burgers
```

### More technical details

You might have noticed that `await` can only be used inside of functions defined with `async def`.

```Python hl_lines="2-3"
@app.get('/burgers')
async def read_burgers():
    burgers = await get_burgers(2)
    return burgers
```

### 더 세부적인 기술적 사항

`await`가 `async def`를 사용하는 함수 내부에서만 사용이 가능하다는 것을 눈치채셨을 것입니다.

하지만 동시에, `async def`로 정의된 함수들은 "대기"되어야만 합니다. 따라서, `async def`를 사용한 함수들은 역시 `async def`를 사용한 함수 내부에서만 호출될 수 있습니다.

```Python hl_lines="7"
{!../../../docs_src/async_tests/test_main.py!}
```

!!! tip
    Note that the test function is now `async def` instead of just `def` as before when using the `TestClient`.

Then we can create an `AsyncClient` with the app, and send async requests to it, using `await`.

```Python hl_lines="9-10"
{!../../../docs_src/async_tests/test_main.py!}
```

This is the equivalent to:

Gleichzeitig müssen aber mit `async def` definierte Funktionen „erwartet“ („awaited“) werden. Daher können Funktionen mit `async def` nur innerhalb von Funktionen aufgerufen werden, die auch mit `async def` definiert sind.

Daraus resultiert das Ei-und-Huhn-Problem: Wie ruft man die erste `async` Funktion auf?

```Python hl_lines="2"
@app.get('/')
async def read_results():
    results = await some_library()
    return results
```

!!! note "Nota"
    Solo puedes usar `await` dentro de funciones creadas con `async def`.

---

    return burgers
```

### 更多技术细节

您可能已经注意到，`await` 只能在 `async def` 定义的函数内部使用。

但与此同时，必须"等待"通过 `async def` 定义的函数。因此，带 `async def` 的函数也只能在 `async def` 定义的函数内部调用。

那么，这关于先有鸡还是先有蛋的问题，如何调用第一个 `async` 函数？

如果您使用 **FastAPI**，你不必担心这一点，因为"第一个"函数将是你的路径操作函数，FastAPI 将知道如何做正确的事情。

但如果您想在没有 FastAPI 的情况下使用 `async` / `await`，则可以这样做。

### 编写自己的异步代码

```

В этом случае *функции обработки пути* необходимо объявлять с использованием синтаксиса `async def`:

```Python hl_lines="2"
@app.get('/')
async def read_results():
    results = await some_library()
    return results
```

!!! note
    `await` можно использовать только внутри функций, объявленных с использованием `async def`.

---

Если вы обращаетесь к сторонней библиотеке, которая с чем-то взаимодействует

    assert state["/sync_raise"] == "generator raise finalized"
    assert "/sync_raise" not in errors


def test_sync_async_raise_raises():
    with pytest.raises(AsyncDependencyError):
        client.get("/sync_async_raise")
    assert state["/async_raise"] == "asyncgen raise finalized"
    assert "/async_raise" in errors
    errors.clear()


def test_sync_async_raise_server_error():