DB.Save(&animal)
	updatedAt1 := animal.UpdatedAt

	DB.Save(&animal).Update("name", "Francis")
	if updatedAt1.Format(time.RFC3339Nano) == animal.UpdatedAt.Format(time.RFC3339Nano) {
		t.Errorf("UpdatedAt should be updated")
	}

	var animals []Animal
	DB.Find(&animals)
	if count := DB.Model(Animal{}).Where("1=1").Update("CreatedAt", time.Now().Add(2*time.Hour)).RowsAffected; count != int64(len(animals)) {

    private final String output;

    /**
     * Array of new input character sequences for update operations.
     * When not null, indicates this item has pending updates.
     */
    private String[] newInputs;

    /**
     * The new output character sequence for update operations.
     * When not null, indicates this item has pending updates.
     */
    private String newOutput;

    /**

* 🌐 Update translations for de (update-all) . PR [#14910](https://github.com/fastapi/fastapi/pull/14910) by [@YuriiMotov](https://github.com/YuriiMotov).
* 🌐 Update translations for ja (update-all). PR [#14916](https://github.com/fastapi/fastapi/pull/14916) by [@YuriiMotov](https://github.com/YuriiMotov).

{* ../../docs_src/body_updates/tutorial002_py310.py hl[32] *}

### 使用 Pydantic 的 `update` 参数 { #using-pydantics-update-parameter }

接下来，用 `.model_copy()` 为已有模型创建副本，并传入 `update` 参数，值为包含更新数据的 `dict`。

例如，`stored_item_model.model_copy(update=update_data)`：

{* ../../docs_src/body_updates/tutorial002_py310.py hl[33] *}

### 部分更新小结 { #partial-updates-recap }

简而言之，应用部分更新应当：

* （可选）使用 `PATCH` 而不是 `PUT`。
* 提取已存储的数据。

      checkNotDone();
      mac.update(b);
    }

    @Override
    protected void update(byte[] b, int off, int len) {
      checkNotDone();
      mac.update(b, off, len);
    }

    @Override
    protected void update(ByteBuffer bytes) {
      checkNotDone();
      checkNotNull(bytes);
      mac.update(bytes);
    }

    private void checkNotDone() {

        final byte[] digest = this.md5.digest();
        this.md5.update(this.opad);
        return this.md5.digest(digest);
    }

    @Override
    protected int engineDigest(final byte[] buf, final int offset, final int len) {
        final byte[] digest = this.md5.digest();
        this.md5.update(this.opad);
        this.md5.update(digest);
        try {
            return this.md5.digest(buf, offset, len);

    protected byte[] engineDigest() {
        final byte[] digest = md5.digest();
        md5.update(opad);
        return md5.digest(digest);
    }

    @Override
    protected int engineDigest(final byte[] buf, final int offset, final int len) {
        final byte[] digest = md5.digest();
        md5.update(opad);
        md5.update(digest);
        try {
            return md5.digest(buf, offset, len);

		t.Errorf("failed to update with named arg")
	}

	AssertEqual(t, result4, namedUser)

	if err := DB.Exec("UPDATE named_users SET name1 = @name, name2 = @name2, name3 = @name", sql.Named("name", "jinzhu-new"), sql.Named("name2", "jinzhu-new2")).Error; err != nil {
		t.Errorf("failed to update with named arg")
	}

	namedUser.Name1 = "jinzhu-new"
	namedUser.Name2 = "jinzhu-new2"

{* ../../docs_src/body_updates/tutorial002_py310.py hl[32] *}

### Pydanticの`update`パラメータの使用 { #using-pydantics-update-parameter }

ここで、`.model_copy()`を用いて既存のモデルのコピーを作成し、`update`パラメータに更新するデータを含む`dict`を渡すことができます。

`stored_item_model.model_copy(update=update_data)`のように:

{* ../../docs_src/body_updates/tutorial002_py310.py hl[33] *}

### 部分的更新のまとめ { #partial-updates-recap }

まとめると、部分的な更新を適用するには、次のようにします:

   * alternative to {@code compareAndSet}.
   *
   * @param expect the expected value
   * @param update the new value
   * @return {@code true} if successful
   */
  public final boolean weakCompareAndSet(double expect, double update) {
    return value.weakCompareAndSet(doubleToRawLongBits(expect), doubleToRawLongBits(update));
  }

  /**
   * Atomically adds the given value to the current value.
   *