# Class TransactionHelper (5.0.3)

    public final class TransactionHelper

[TransactionHelper](https://docs.cloud.google.com/appengine/docs/standard/java-gen2/reference/services/bundled/latest/com.google.appengine.api.datastore.TransactionHelper) enables the task queue API to serialize a datastore transaction without
knowing the details of how it is implemented.

## Inheritance

[java.lang.Object](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html) \> TransactionHelper

## Inherited Members

[Object.clone()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--) [Object.equals(Object)](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#equals-java.lang.Object-) [Object.finalize()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#finalize--) [Object.getClass()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--) [Object.hashCode()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--) [Object.notify()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--) [Object.notifyAll()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--) [Object.toString()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--) [Object.wait()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--) [Object.wait(long)](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-) [Object.wait(long,int)](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-)

## Static Methods

### setTransaction(Transaction txn, TaskQueuePb.TaskQueueAddRequest.Builder request)

    public static void setTransaction(Transaction txn, TaskQueuePb.TaskQueueAddRequest.Builder request)

Sets either the transaction or datastore_transaction field in a TaskQueueAddRequest depending
on what kind of transaction is provided.

| **Parameters** ||
|---|---|
| **Name** | **Description** |
| `txn` | `https://docs.cloud.google.com/appengine/docs/standard/java-gen2/reference/services/bundled/latest/com.google.appengine.api.datastore.Transaction` |
| `request` | `com.google.appengine.api.taskqueue_bytes.TaskQueuePb.TaskQueueAddRequest.Builder` |