**`Session`**은 **메모리에 객체**를 저장하고 데이터에 필요한 모든 변경 사항을 추적한 후, **`engine`을 통해** 데이터베이스와 통신합니다.

`yield`를 사용해 FastAPI의 **의존성**을 생성하여 각 요청마다 새로운 `Session`을 제공합니다. 이는 요청당 하나의 세션만 사용되도록 보장합니다. 🤓

그런 다음 이 의존성을 사용하는 나머지 코드를 간소화하기 위해 `Annotated` 의존성 `SessionDep`을 생성합니다.

{* ../../docs_src/sql_databases/tutorial001_an_py310.py ln[25:30]  hl[25:27,30] *}

### 시작 시 데이터베이스 테이블 생성하기 { #create-database-tables-on-startup }

애플리케이션 시작 시 데이터베이스 테이블을 생성합니다.

    for (Enumeration<?> e = properties.propertyNames(); e.hasMoreElements(); ) {
      /*
       * requireNonNull is safe because propertyNames contains only non-null elements.
       *
       * Accordingly, we have it annotated as returning `Enumeration<? extends Object>` in our
       * prototype checker's JDK. However, the checker still sees the return type as plain

- Stopped expanding PVCs annotated with node-expand-not-required. ([#131907](https://github.com/kubernetes/kubernetes/pull/131907), [@gnufied](https://github.com/gnufied)) [SIG API Machinery, Etcd, Node, Storage and Testing]

    for (Enumeration<?> e = properties.propertyNames(); e.hasMoreElements(); ) {
      /*
       * requireNonNull is safe because propertyNames contains only non-null elements.
       *
       * Accordingly, we have it annotated as returning `Enumeration<? extends Object>` in our
       * prototype checker's JDK. However, the checker still sees the return type as plain

- Fixed a bug which could have allowed an improperly annotated LoadBalancer service to become active. ([#109601](https://github.com/kubernetes/kubernetes/pull/109601), [@mdbooth](https://github.com/mdbooth))

* Add a new feature gate for enabling an alpha annotation which, if present, excludes the annotated node from being added to a service load balancers. ([#54644](https://github.com/kubernetes/kubernetes/pull/54644), [@brendandburns](https://github.com/brendandburns))

Kubernetes 1.11 also makes it easier to see what's happening, as audit events can now be annotated with information about how an API request was handled:

In an expression switch, the cases contain expressions that are compared
against the value of the switch expression.
In a type switch, the cases contain types that are compared against the
type of a specially annotated switch expression.
The switch expression is evaluated exactly once in a switch statement.
</p>

<h4 id="Expression_switches">Expression switches</h4>

<p>
In an expression switch,

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.graal

import com.oracle.svm.core.annotate.Delete
import com.oracle.svm.core.annotate.Substitute
import com.oracle.svm.core.annotate.TargetClass
import okhttp3.internal.platform.BouncyCastlePlatform
import okhttp3.internal.platform.ConscryptPlatform
import okhttp3.internal.platform.Jdk8WithJettyBootPlatform

Buna rağmen normal şekilde tanımladığınız diğer herhangi bir parameter (örneğin Pydantic model ile body) yine doğrulanır, dönüştürülür, annotate edilir, vb.

Ama bazı özel durumlarda `Request` nesnesini almak faydalıdır.

## `Request` nesnesini doğrudan kullanın { #use-the-request-object-directly }