```

## 执行项目

您可以复制这些代码并按原样使用它。

!!! info

    事实上，这里的代码只是大多数测试代码的一部分。

你可以用 Uvicorn 运行它：


<div class="termy">

```console
$ uvicorn sql_app.main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

## ✅ ⚫️

👆 💪 📁 👉 📟 & ⚙️ ⚫️.

!!! info

    👐, 📟 🎦 📥 🍕 💯. 🌅 📟 👉 🩺.

⤴️ 👆 💪 🏃 ⚫️ ⏮️ Uvicorn:


<div class="termy">

```console
$ uvicorn sql_app.main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

{!../../../docs_src/sql_databases/sql_app/models.py!}
```

When accessing the attribute `items` in a `User`, as in `my_user.items`, it will have a list of `Item` SQLAlchemy models (from the `items` table) that have a foreign key pointing to this record in the `users` table.

When you access `my_user.items`, SQLAlchemy will actually go and fetch the items from the database in the `items` table and populate them here.