```Python hl_lines="13-18"
{!> ../../docs_src/sql_databases/sql_app_py39/main.py!}
```

////

/// info

👥 🚮 🏗 `SessionLocal()` & 🚚 📨 `try` 🍫.

 & ⤴️ 👥 🔐 ⚫️ `finally` 🍫.

👉 🌌 👥 ⚒ 💭 💽 🎉 🕧 📪 ⏮️ 📨. 🚥 📤 ⚠ ⏪ 🏭 📨.

    public ActionFuture<SearchResponse> search(final SearchRequest request) {
        return client.search(request);
    }

    @Override
    public void search(final SearchRequest request, final ActionListener<SearchResponse> listener) {
        client.search(request, listener);
    }

    @Override
    public SearchRequestBuilder prepareSearch(final String... indices) {

        }

        return ":" + firstFailedProject.getArtifactId();
    }

    protected static final Pattern NEXT_LINE = Pattern.compile("\r?\n");

    protected static final Pattern LAST_ANSI_SEQUENCE = Pattern.compile("(\u001B\\[[;\\d]*[ -/]*[@-~])[^\u001B]*$");

    protected static final String ANSI_RESET = "\u001B\u005Bm";

  }

  private static final ByteSource BROKEN_CLOSE_SOURCE =
      new TestByteSource(new byte[10], CLOSE_THROWS);
  private static final ByteSource BROKEN_OPEN_SOURCE =
      new TestByteSource(new byte[10], OPEN_THROWS);
  private static final ByteSource BROKEN_READ_SOURCE =
      new TestByteSource(new byte[10], READ_THROWS);
  private static final ByteSink BROKEN_CLOSE_SINK = new TestByteSink(CLOSE_THROWS);

   * @since 14.0
   */
  public static ByteSink asByteSink(File file, FileWriteMode... modes) {
    return new FileByteSink(file, modes);
  }

  private static final class FileByteSink extends ByteSink {

    private final File file;
    private final ImmutableSet<FileWriteMode> modes;

    private FileByteSink(File file, FileWriteMode... modes) {
      this.file = checkNotNull(file);

///

## 包含 `yield` 和 `try` 的依赖项

如果在包含 `yield` 的依赖中使用 `try` 代码块，你会捕获到使用依赖时抛出的任何异常。

例如，如果某段代码在另一个依赖中或在 *路由函数* 中使数据库事务"回滚"或产生任何其他错误，你将会在依赖中捕获到异常。

因此，你可以使用 `except SomeException` 在依赖中捕获特定的异常。

同样，你也可以使用 `finally` 来确保退出步骤得到执行，无论是否存在异常。

```Python hl_lines="3  5"
{!../../docs_src/dependencies/tutorial007.py!}
```
## 使用 `yield` 的子依赖项

你可以声明任意数量和层级的树状依赖，而且它们中的任何一个或所有的都可以使用 `yield`。

     then the rights granted under this License from a particular Contributor
     are reinstated (a) provisionally, unless and until such Contributor
     explicitly and finally terminates Your grants, and (b) on an ongoing basis,
     if such Contributor fails to notify You of the non-compliance by some
     reasonable means prior to 60 days after You have come back into compliance.

Sie können also mit `except SomeException` diese bestimmte Exception innerhalb der Abhängigkeit handhaben.

Auf die gleiche Weise können Sie `finally` verwenden, um sicherzustellen, dass die Exit-Schritte ausgeführt werden, unabhängig davon, ob eine Exception geworfen wurde oder nicht.

```Python hl_lines="3  5"
{!../../docs_src/dependencies/tutorial007.py!}
```

 * Hasher}. Obtain a new hasher from the hash function using {@link #newHasher}, "push" the relevant
 * data into it using methods like {@link Hasher#putBytes(byte[])}, and finally ask for the {@code
 * HashCode} when finished using {@link Hasher#hash}. (See an {@linkplain #newHasher example} of
 * this.)
 *
 * <p>If all you want to hash is a single byte array, string or {@code long} value, there are

 * Hasher}. Obtain a new hasher from the hash function using {@link #newHasher}, "push" the relevant
 * data into it using methods like {@link Hasher#putBytes(byte[])}, and finally ask for the {@code
 * HashCode} when finished using {@link Hasher#hash}. (See an {@linkplain #newHasher example} of
 * this.)
 *
 * <p>If all you want to hash is a single byte array, string or {@code long} value, there are