Pero al comprobar benchmarks y comparaciones debes tener en cuenta lo siguiente.

## Benchmarks y velocidad

Cuando revisas los benchmarks, es común ver varias herramientas de diferentes tipos comparadas como equivalentes.

该类的每个*实例对象都代表数据库中的一行数据。*

又例如，一个对象`orion_cat`（`Pet`的一个实例）可以有一个属性`orion_cat.type`, 对标数据库中的`type`列。并且该属性的值可以是其它，例如`"cat"`。

这些 ORM 还具有在表或实体之间建立关系的工具（比如创建多表关系）。

这样，您还可以拥有一个属性`orion_cat.owner`，它包含该宠物所有者的数据，这些数据取自另外一个表。

因此，`orion_cat.owner.name`可能是该宠物主人的姓名（来自表`owners`中的列`name`）。

它可能有一个像`"Arquilian"`(一种业务逻辑)。

当您尝试从您的宠物对象访问它时，ORM 将完成所有工作以从相应的表*所有者那里再获取信息。*

    return current_user


@app.get("/users/me/items/")
async def read_own_items(current_user: User = Depends(get_current_active_user)):

):
    return current_user


@app.get("/users/me/items/")
async def read_own_items(
    current_user: Annotated[User, Depends(get_current_active_user)],
):

    response = client.get(
        "/users/me/items/", headers={"Authorization": f"Bearer {access_token}"}
    )
    assert response.status_code == 200, response.text
    assert response.json() == [{"item_id": "Foo", "owner": "johndoe"}]


def test_read_system_status():
    access_token = get_access_token()
    response = client.get(
        "/status/", headers={"Authorization": f"Bearer {access_token}"}
    )

    @app.get("/users/me/items/")
    async def read_own_items(
        current_user: Annotated[User, Security(get_current_active_user, scopes=["items"])]
    ):
        return [{"item_id": "Foo", "owner": current_user.username}]
    ```
    """

data = {
    "plumbus": {"description": "Freshly pickled plumbus", "owner": "Morty"},
    "portal-gun": {"description": "Gun to create portals", "owner": "Rick"},
}


class OwnerError(Exception):
    pass


def get_username():
    try:
        yield "Rick"
    except OwnerError as e:
        raise HTTPException(status_code=400, detail=f"Owner error: {e}")


@app.get("/items/{item_id}")

    assert response.status_code == 404, response.text
    assert response.json() == {"detail": "Item not found"}


def test_owner_error():
    response = client.get("/items/plumbus")
    assert response.status_code == 400, response.text
    assert response.json() == {"detail": "Owner error: Rick"}


def test_get_item():
    response = client.get("/items/portal-gun")
    assert response.status_code == 200, response.text

                            {"title": "Description", "type": "string"},
                        ),
                        "id": {"title": "Id", "type": "integer"},
                        "owner_id": {"title": "Owner Id", "type": "integer"},
                    },
                },
                "User": {
                    "title": "User",
                    "required": ["email", "id", "is_active"],

                            {"title": "Description", "type": "string"},
                        ),
                        "id": {"title": "Id", "type": "integer"},
                        "owner_id": {"title": "Owner Id", "type": "integer"},
                    },
                },
                "User": {
                    "title": "User",
                    "required": ["email", "id", "is_active"],