👈, 👥 💪 ✍ ➕1️⃣ `async` 🔗 `reset_db_state()` 👈 ⚙️ 🎧-🔗 `get_db()`. ⚫️ 🔜 ⚒ 💲 🔑 🔢 (⏮️ 🔢 `dict`) 👈 🔜 ⚙️ 💽 🇵🇸 🎂 📨. & ⤴️ 🔗 `get_db()` 🔜 🏪 ⚫️ 💽 🇵🇸 (🔗, 💵, ♒️).

```Python hl_lines="18-20"
{!../../../docs_src/sql_databases_peewee/sql_app/main.py!}
```

**⏭ 📨**, 👥 🔜 ⏲ 👈 🔑 🔢 🔄 `async` 🔗 `reset_db_state()` & ⤴️ ✍ 🆕 🔗 `get_db()` 🔗, 👈 🆕 📨 🔜 ✔️ 🚮 👍 💽 🇵🇸 (🔗, 💵, ♒️).

!!! tip

For that, we need to create another `async` dependency `reset_db_state()` that is used as a sub-dependency in `get_db()`. It will set the value for the context variable (with just a default `dict`) that will be used as the database state for the whole request. And then the dependency `get_db()` will store in it the database state (connection, transactions, etc).

```Python hl_lines="18-20"

```Python hl_lines="2"
@app.get("/users/{user_id}", response_model=schemas.User)
def read_user(user_id: int, db: Session = Depends(get_db)):
    db_user = crud.get_user(db, user_id=user_id)
    ...
```

!!! info

```

然后我们应该声明*路径操作函数*和不带 的依赖关系`async def`，只需使用普通的`def`，如下：

```Python hl_lines="2"
@app.get("/users/{user_id}", response_model=schemas.User)
def read_user(user_id: int, db: Session = Depends(get_db)):
    db_user = crud.get_user(db, user_id=user_id)
    ...
```

!!! info
    如果您需要异步连接到关系数据库，请参阅[Async SQL (Relational) Databases](https://fastapi.tiangolo.com/zh/advanced/async-sql-databases/)

```

⤴️ 👥 🔜 📣 *➡ 🛠️ 🔢* & 🔗 🍵 `async def`, ⏮️ 😐 `def`,:

```Python hl_lines="2"
@app.get("/users/{user_id}", response_model=schemas.User)
def read_user(user_id: int, db: Session = Depends(get_db)):
    db_user = crud.get_user(db, user_id=user_id)
    ...
```

!!! info
    🚥 👆 💪 🔗 👆 🔗 💽 🔁, 👀 [🔁 🗄 (🔗) 💽](../advanced/async-sql-databases.md){.internal-link target=_blank}.

        profile.id(modelProfile.getId());

        org.apache.maven.api.model.Activation modelActivation = modelProfile.getActivation();

        if (modelActivation != null) {
            Activation.Builder activation = Activation.newBuilder();

            activation.activeByDefault(modelActivation.isActiveByDefault());

            activation.jdk(modelActivation.getJdk());

        profile.id(modelProfile.getId());

        org.apache.maven.api.model.Activation modelActivation = modelProfile.getActivation();

        if (modelActivation != null) {
            Activation.Builder activation = Activation.newBuilder();

            activation.activeByDefault(modelActivation.isActiveByDefault());

            activation.jdk(modelActivation.getJdk());

        dest.setBbb("bbb");
        dest.setDdd("ddd");

        BeanUtil.copyBeanToBean(src, dest);
        assertThat(dest.getAaa(), is("111"));
        assertThat(dest.getBbb(), is(nullValue()));
        assertThat(dest.getDdd(), is("ddd"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testCopy_BeanToBean_ExcludeNull() throws Exception {
        final MyClass src = new MyClass();

            validateBannedCharacters(
                    problems,
                    prefix + ".id",
                    BuilderProblem.Severity.WARNING,
                    repository.getId(),
                    null,
                    ILLEGAL_REPO_ID_CHARS);

            if ("local".equals(repository.getId())) {
                addViolation(

        this.digest = Crypto.getMD5();
        this.macSigningKey = macSigningKey;
    }


    /**
     * Construct a digest with a non-zero starting sequence number
     * 
     * @param macSigningKey
     * @param initialSequence
     */
    public SMB1SigningDigest ( byte[] macSigningKey, int initialSequence ) {
        this.digest = Crypto.getMD5();
        this.macSigningKey = macSigningKey;