print("## Unchanged:", len(common) - changed)

    for k in sorted(added):
        print("+", k)

    for k in sorted(removed):
        print("-", k)

    print("##", "*" * 25)

    for k in sorted(common):
        if q0[k] != q1[k]:
            print("## ", k)
            s0 = yaml.safe_dump(q0[k], default_flow_style=False, indent=2)

    连接 PostgreSQL 等数据库时，需要修改 `DATABASE_URL`。

## 创建表

本例中，使用 Python 文件创建表，但在生产环境中，应使用集成迁移等功能的 Alembic 创建表。

本例在启动 **FastAPI** 应用前，直接执行这些操作。

* 创建 `engine`
* 使用 `metadata` 对象创建所有表

```Python hl_lines="25-28"
{!../../../docs_src/async_sql_databases/tutorial001.py!}
```

## 创建模型

创建以下 Pydantic 模型：

* 创建笔记的模型（`NoteIn`）
* 返回笔记的模型（`Note`）

```Python hl_lines="31-33  36-39"

                                <table class="table table-bordered">
                                    <tbody>
                                    <tr>
                                        <th style="width: 25%"><la:message key="labels.role_name"/></th>
                                        <td>${f:h(name)}<la:hidden property="name"/></td>
                                    </tr>
                                    </tbody>

	// calculate the rectangular box size.
	maxContentWidth := max(line1Length, line2Length)

	// termWidth is set to a default one to use when we are
	// not able to calculate terminal width via OS syscalls
	termWidth := 25
	if width, err := pb.GetTerminalWidth(); err == nil {
		termWidth = width
	}

	// Box cannot be printed if terminal width is small than maxContentWidth
	if maxContentWidth > termWidth {

	_ = x[HandlerRenameFile-19]
	_ = x[HandlerReadAll-20]
	_ = x[HandlerServerVerify-21]
	_ = x[HandlerTrace-22]
	_ = x[HandlerListen-23]
	_ = x[HandlerDeleteBucketMetadata-24]
	_ = x[HandlerLoadBucketMetadata-25]
	_ = x[HandlerReloadSiteReplicationConfig-26]
	_ = x[HandlerReloadPoolMeta-27]
	_ = x[HandlerStopRebalance-28]
	_ = x[HandlerLoadRebalanceMeta-29]
	_ = x[HandlerLoadTransitionTierConfig-30]
	_ = x[HandlerDeletePolicy-31]

    stopwatch.start();
    ticker.advance(9);
    stopwatch.stop();

    ticker.advance(16);

    stopwatch.start();
    assertEquals(9, stopwatch.elapsed(NANOSECONDS));
    ticker.advance(25);
    assertEquals(34, stopwatch.elapsed(NANOSECONDS));

    stopwatch.stop();
    ticker.advance(36);
    assertEquals(34, stopwatch.elapsed(NANOSECONDS));
  }

  public void testElapsed_micros() {

		// If stats.PauseQuantiles is non-empty, ReadGCStats fills
		// it with quantiles summarizing the distribution of pause time.
		// For example, if len(stats.PauseQuantiles) is 5, it will be
		// filled with the minimum, 25%, 50%, 75%, and maximum pause times.
		PauseQuantiles: make([]time.Duration, 5),
	}
	debug.ReadGCStats(&gcStats)
	// Truncate GC stats to max 5 entries.
	if len(gcStats.PauseEnd) > 5 {

    public String toString() {
        int count, i;
        String str;

        StringBuffer sb = new StringBuffer();
        sb.append( isAllow() ? "Allow " : "Deny  " );
        appendCol(sb, sid.toDisplayString(), 25);
        sb.append( " 0x" ).append( Hexdump.toHexString( access, 8 )).append(' ');
        sb.append(isInherited() ? "Inherited " : "Direct    ");
        appendCol(sb, getApplyToText(), 34);
        return sb.toString();

                                <table class="table table-bordered">
                                    <tbody>
                                    <tr>
                                        <th style="width: 25%"><la:message
                                                key="labels.dict_stopwords_source"/></th>
                                        <td>${f:h(input)}<la:hidden property="input"/></td>

                                <table class="table table-bordered">
                                    <tbody>
                                    <tr>
                                        <th style="width: 25%"><la:message
                                                key="labels.dict_protwords_source"/></th>
                                        <td>${f:h(input)}<la:hidden property="input"/></td>