}

	if err := tx.Rollback().Error; err != nil {
		t.Fatalf("failed to rollback transaction: %v", err)
	}

	count2, err := gorm.G[User](DB).Where("name like ?", "TestGenericsTransaction%").Count(ctx, "*")
	if err != nil {
		t.Fatalf("Count failed: %v", err)
	}
	if count2 != 0 {
		t.Errorf("expected 0 records after rollback, got %d", count2)
	}
}

你可以使用 `async` 或一般函式。

**FastAPI** 都會正確處理，和一般相依相同。

///

## 同時使用 `yield` 與 `try` 的相依 { #a-dependency-with-yield-and-try }

如果在含 `yield` 的相依中使用 `try` 區塊，你會接收到使用該相依時拋出的任何例外。

例如，如果在中途的某段程式碼、其他相依，或某個路徑操作中，讓資料庫交易「rollback」或產生了任何例外，你都會在你的相依中接收到該例外。

因此，你可以在相依內用 `except SomeException` 來攔截特定例外。

同樣地，你可以使用 `finally` 來確保無論是否有例外都會執行結束步驟。

{* ../../docs_src/dependencies/tutorial007_py310.py hl[3,5] *}

For example, if some code at some point in the middle, in another dependency or in a *path operation*, made a database transaction "rollback" or created any other exception, you would receive the exception in your dependency.

So, you can look for that specific exception inside the dependency with `except SomeException`.

            byte[] newKey = deriveKey(currentKey, rotationLabel, String.valueOf(System.currentTimeMillis()).getBytes(), currentKey.length);

            // Archive old key (keep last version for rollback)
            String archiveId = sessionId + ".v" + currentVersion;
            storeSessionKeyInternal(archiveId, currentKey, "AES");

            // Store new key

	if err = selfupdate.CommitBinary(opts); err != nil {
		if rerr := selfupdate.RollbackError(err); rerr != nil {
			return AdminError{
				Code:       AdminUpdateApplyFailure,
				Message:    fmt.Sprintf("Failed to rollback from bad update: %v", rerr),
				StatusCode: http.StatusInternalServerError,
			}
		}
		var pathErr *os.PathError
		if errors.As(err, &pathErr) {
			return AdminError{
				Code: AdminUpdateApplyFailure,

	tx := db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	if err := tx.Error; err != nil {
		t.Errorf("Failed to start transaction, got error %v\n", err)
	}

	if err := tx.Where("name=?", "zzjin").Delete(&User{}).Error; err != nil {
		tx.Rollback()
		t.Errorf("Failed to run one transaction, got error %v\n", err)
	}

### Go-Live

- [ ] Schedule maintenance window
- [ ] Final incremental data sync
- [ ] Switch DNS or endpoints to Fess
- [ ] Monitor logs for errors
- [ ] Monitor search performance metrics
- [ ] Have rollback plan ready

### Post-Migration

- [ ] Monitor search quality and relevance
- [ ] Tune ranking and boosting settings
- [ ] Set up regular crawl schedules
- [ ] Configure backup and disaster recovery

		}
	}
}

func CommitOrRollbackTransaction(db *gorm.DB) {
	if !db.Config.SkipDefaultTransaction {
		if _, ok := db.InstanceGet("gorm:started_transaction"); ok {
			if db.Error != nil {
				db.Rollback()
			} else {
				db.Commit()
			}

			db.Statement.ConnPool = db.ConnPool
		}
	}

	}

	if sqlTx, ok := tx.Statement.ConnPool.(gorm.TxCommitter); !ok || sqlTx == nil {
		t.Fatalf("Should return the underlying sql.Tx")
	}

	tx.Rollback()

	if err = db.First(&User{}, "name = ?", "transaction").Error; err == nil {
		t.Fatalf("Should not find record after rollback, but got %v", err)
	}

	txDB := db.Where("fake_name = ?", "fake_name")
	tx2 := txDB.Session(&gorm.Session{NewDB: true}).Begin()

// doesn't require clients to initiate multiple such requests.
//
// All parts are purged from all disks and reference to the uploadID
// would be removed from the system, rollback is not possible on this
// operation.
func (er erasureObjects) AbortMultipartUpload(ctx context.Context, bucket, object, uploadID string, opts ObjectOptions) (err error) {
	if !opts.NoAuditLog {