而且您还可以将 Alembic 用于“迁移”（这是它的主要工作）。

“迁移”是每当您更改 SQLAlchemy 模型的结构、添加新属性等以在数据库中复制这些更改、添加新列、新表等时所需的一组步骤。

您可以在[Project Generation - Template](https://fastapi.tiangolo.com/zh/project-generation/)的模板中找到一个 FastAPI 项目中的 Alembic 示例。具体在[`alembic`代码目录中](https://github.com/tiangolo/full-stack-fastapi-postgresql/tree/master/src/backend/app/alembic/)。

### 创建依赖项

📥 👥 🔜 👀 ❔ 👷 ⏮️ **🇸🇲 🐜**.

🎏 🌌 👆 💪 ⚙️ 🙆 🎏 🐜.

!!! tip
    📤 🌓 📄 ⚙️ 🏒 📥 🩺.

## 📁 📊

👫 🖼, ➡️ 💬 👆 ✔️ 📁 📛 `my_super_project` 👈 🔌 🎧-📁 🤙 `sql_app` ⏮️ 📊 💖 👉:

```
.
└── sql_app
    ├── __init__.py
    ├── crud.py
    ├── database.py
    ├── main.py
    ├── models.py
    └── schemas.py
```

you change the structure of your SQLAlchemy models, add a new attribute, etc. to replicate those changes in the database, add a new column, a new table, etc.

You can find an example of Alembic in a FastAPI project in the templates from [Project Generation - Template](../project-generation.md){.internal-link target=_blank}. Specifically in <a href="https://github.com/tiangolo/full-stack-fastapi-postgresql/tree/master/src/backend/app/alembic" class="external-link" target="_blank">the `alembic`...