*
   * @since 7.0
   */
  public static long fromBytes(
      byte b1, byte b2, byte b3, byte b4, byte b5, byte b6, byte b7, byte b8) {
    return (b1 & 0xFFL) << 56
        | (b2 & 0xFFL) << 48
        | (b3 & 0xFFL) << 40
        | (b4 & 0xFFL) << 32
        | (b5 & 0xFFL) << 24
        | (b6 & 0xFFL) << 16
        | (b7 & 0xFFL) << 8
        | (b8 & 0xFFL);
  }

   *
   * @since 7.0
   */
  public static long fromBytes(
      byte b1, byte b2, byte b3, byte b4, byte b5, byte b6, byte b7, byte b8) {
    return (b1 & 0xFFL) << 56
        | (b2 & 0xFFL) << 48
        | (b3 & 0xFFL) << 40
        | (b4 & 0xFFL) << 32
        | (b5 & 0xFFL) << 24
        | (b6 & 0xFFL) << 16
        | (b7 & 0xFFL) << 8
        | (b8 & 0xFFL);
  }

pkg syscall (openbsd-386), const SYS___THRSLEEP = 94
pkg syscall (openbsd-386), const SizeofIfData = 212
pkg syscall (openbsd-386), const SizeofIfMsghdr = 236
pkg syscall (openbsd-386), const SizeofRtMetrics = 56
pkg syscall (openbsd-386), const SizeofRtMsghdr = 96
pkg syscall (openbsd-386), const TCP_NOPUSH = 16
pkg syscall (openbsd-386), const TCP_NOPUSH ideal-int
pkg syscall (openbsd-386), const TIOCGSID = 1074033763

pkg debug/elf, const R_ARM_PRIVATE_8 = 120
pkg debug/elf, const R_ARM_PRIVATE_8 R_ARM
pkg debug/elf, const R_ARM_PRIVATE_9 = 121
pkg debug/elf, const R_ARM_PRIVATE_9 R_ARM
pkg debug/elf, const R_ARM_REL32_NOI = 56
pkg debug/elf, const R_ARM_REL32_NOI R_ARM
pkg debug/elf, const R_ARM_RXPC25 = 249
pkg debug/elf, const R_ARM_RXPC25 R_ARM
pkg debug/elf, const R_ARM_SBREL31 = 39
pkg debug/elf, const R_ARM_SBREL31 R_ARM

pkg log/syslog (netbsd-arm64-cgo), const LOG_LPR Priority
pkg log/syslog (netbsd-arm64-cgo), const LOG_MAIL = 16
pkg log/syslog (netbsd-arm64-cgo), const LOG_MAIL Priority
pkg log/syslog (netbsd-arm64-cgo), const LOG_NEWS = 56
pkg log/syslog (netbsd-arm64-cgo), const LOG_NEWS Priority
pkg log/syslog (netbsd-arm64-cgo), const LOG_NOTICE = 5
pkg log/syslog (netbsd-arm64-cgo), const LOG_NOTICE Priority

こんにちは、Kaoru FUZITAさん。


@tokyo_bousai
【気象情報】７月３０日（木）１３時５６分現在、気象庁から大雨、洪水警報が発表されています。多摩北部・西部・南部では、低い土地の浸水や河川の増水に警戒してください。http://t.co/SttHvzrWR8
https://twitter.com/tokyo_bousai/status/626620914617024512

@riezo0608
猫を愛する漫画家10人の展覧会「ねこまんてん」
「猫の額」（東京・高円寺）にて7/31～8/12開催予定。
みんにゃ来てね！
http://t.co/t0dkECemdh http://t.co/T4feyVmazB
https://twitter.com/riezo0608/status/626571637073145856

@Mint_Lee

				1:  {vDelMarker, vObj}, // disk 1
				2:  {vDelMarker, vObj}, // disk 2
				3:  {vDelMarker, vObj}, // disk 3
				4:  {vDelMarker, vObj}, // disk 4
				5:  {vDelMarker, vObj}, // disk 5
				6:  {vDelMarker, vObj}, // disk 6
				7:  {vDelMarker, vObj}, // disk 7
				8:  {vDelMarker, vObj}, // disk 8
				9:  {vDelMarker, vObj}, // disk 9
				10: {vObj},             // disk 10

- login: falkben
  count: 59
  avatarUrl: https://avatars.githubusercontent.com/u/653031?u=ad9838e089058c9e5a0bab94c0eec7cc181e0cd0&v=4
  url: https://github.com/falkben
- login: n8sty
  count: 56
  avatarUrl: https://avatars.githubusercontent.com/u/2964996?v=4
  url: https://github.com/n8sty
- login: acidjunk
  count: 50

              }
            ]
          }
        ]
      },
      "gridPos": {
        "h": 6,
        "w": 6,
        "x": 12,
        "y": 24
      },
      "id": 56,
      "options": {
        "legend": {
          "calcs": [],
          "displayMode": "list",
          "placement": "bottom",
          "showLegend": true
        },
        "tooltip": {

让我们转到文件`sql_app/database.py`。

### 导入 SQLAlchemy 部件

```Python hl_lines="1-3"
{!../../docs_src/sql_databases/sql_app/database.py!}
```

### 为 SQLAlchemy 定义数据库 URL地址

```Python hl_lines="5-6"
{!../../docs_src/sql_databases/sql_app/database.py!}
```

在这个例子中，我们正在“连接”到一个 SQLite 数据库（用 SQLite 数据库打开一个文件）。

该文件将位于文件中的同一目录中`sql_app.db`。

这就是为什么最后一部分是`./sql_app.db`.