PHP Class Google\Cloud\Datastore\Transaction
A transaction is a set of Datastore operations on one or more entities. Each
transaction is guaranteed to be atomic, which means that transactions are
never partially applied. Either all of the operations in the transaction are
applied, or none of them are applied.
It is highly recommended that users read and understand the underlying
concepts in
Transactions
before beginning.
Mutations (i.e. insert, update and delete) are not executed immediately.
Calls to those methods (and their batch equivalents) will enqueue a new
mutation. Calling {@see \Google\Cloud\Datastore\Transaction::commit()} will
execute all the mutationsin the order they were enqueued, and end the
transaction.
Lookups and queries can be run in a transaction, so long as they are run
prior to committing or rolling back the transaction.
Transactions are an **optional** feature of Google Cloud Datastore. Queries,
lookups and mutations can be executed outside of a Transaction from
{@see \Google\Cloud\Datastore\DatastoreClient}.
Example:
use Google\Cloud\ServiceBuilder;
$cloud = new ServiceBuilder();
$datastore = $cloud->datastore();
$transaction = $datastore->transaction();
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Open project: GoogleCloudPlatform/gcloud-php
Public Methods
| Method |
Description |
|
|
__construct ( Operation $operation, string $projectId, string $transactionId ) |
Create a Transaction |
|
|
commit ( array $options = [] ) : array |
Commit all mutations |
|
|
delete ( Key $key ) : Transaction |
Delete a record |
|
|
deleteBatch ( array $keys ) : Transaction |
Delete multiple records |
|
|
insert ( Entity $entity ) : Transaction |
Insert an entity |
|
|
insertBatch ( array $entities ) : Transaction |
Insert multiple entities |
|
|
lookup ( Key $key, array $options = [] ) : Entity | null |
Retrieve an entity from the datastore inside a transaction |
|
|
lookupBatch ( array $keys, array $options = [] ) : array |
Get multiple entities inside a transaction |
|
|
rollback ( ) : void |
Roll back a Transaction |
|
|
runQuery ( Google\Cloud\Datastore\Query\QueryInterface $query, array $options = [] ) : Generator |
Run a query and return entities inside a Transaction |
|
|
update ( Entity $entity, array $options = [] ) : Transaction |
Update an entity |
|
|
updateBatch ( array $entities, array $options = [] ) : Transaction |
Update multiple entities |
|
|
upsert ( Entity $entity ) : Transaction |
Upsert an entity |
|
|
upsertBatch ( array $entities ) : Transaction |
Upsert multiple entities |
|
Method Details
__construct()
public method
|
public __construct ( Operation $operation, string $projectId, string $transactionId ) |
|
$operation |
Operation |
Class that handles shared API interaction. |
|
$projectId |
string |
The Google Cloud Platform project ID. |
|
$transactionId |
string |
The transaction to run mutations in. |
Calling this method will end the operation (and close the transaction,
if one is specified).
Example:
$transaction->commit();
|
public commit ( array $options = [] ) : array |
|
$options |
array |
[optional] Configuration Options. |
| return |
array |
[Response Body](https://cloud.google.com/datastore/reference/rest/v1/projects/commit#response-body) |
No service requests are run when this method is called.
Use {@see \Google\Cloud\Datastore\Transaction::commit()} to commit changes.
Example:
$key = $datastore->key('Person', 'Bob');
$transaction->delete($key);
$transaction->commit();
|
public delete ( Key $key ) : Transaction |
|
$key |
Key |
The key to delete |
| return |
Transaction |
|
deleteBatch()
public method
No service requests are run when this method is called.
Use {@see \Google\Cloud\Datastore\Transaction::commit()} to commit changes.
Example:
$keys = [
$datastore->key('Person', 'Bob'),
$datastore->key('Person', 'John')
];
$transaction->deleteBatch($keys);
$transaction->commit();
No service requests are run when this method is called.
Use {@see \Google\Cloud\Datastore\Transaction::commit()} to commit changes.
Example:
$key = $datastore->key('Person', 'Bob');
$entity = $datastore->entity($key, ['firstName' => 'Bob']);
$transaction->insert($entity);
$transaction->commit();
|
public insert ( Entity $entity ) : Transaction |
|
$entity |
Entity |
The entity to insert. |
| return |
Transaction |
|
insertBatch()
public method
No service requests are run when this method is called.
Use {@see \Google\Cloud\Datastore\Transaction::commit()} to commit changes.
Example:
$entities = [
$datastore->entity('Person', ['firstName' => 'Bob']),
$datastore->entity('Person', ['firstName' => 'John'])
];
$transaction->insertBatch($entities);
$transaction->commit();
|
public insertBatch ( array $entities ) : Transaction |
|
$entities |
array |
The entities to insert. |
| return |
Transaction |
|
Example:
$key = $datastore->key('Person', 'Bob');
$entity = $transaction->lookup($key);
if (!is_null($entity)) {
echo $entity['firstName']; // 'Bob'
}
|
public lookup ( Key $key, array $options = [] ) : Entity | null |
|
$key |
Key |
$key The identifier to use to locate a desired entity. |
|
$options |
array |
[optional] {
Configuration Options
@type string $className The name of the class to return results as.
Must be a subclass of {@see \Google\Cloud\Datastore\Entity}.
If not set, {@see \Google\Cloud\Datastore\Entity} will be used.
} |
| return |
Entity | null |
|
lookupBatch()
public method
Example:
$keys = [
$datastore->key('Person', 'Bob'),
$datastore->key('Person', 'John')
];
$entities = $transaction->lookupBatch($keys);
foreach ($entities['found'] as $entity) {
echo $entity['firstName'] . PHP_EOL;
}
|
public lookupBatch ( array $keys, array $options = [] ) : array |
|
$keys |
array |
|
|
$options |
array |
[optional] {
Configuration Options
@type string|array $className If a string, the name of the class to return results as.
Must be a subclass of {@see \Google\Cloud\Datastore\Entity}.
If not set, {@see \Google\Cloud\Datastore\Entity} will be used.
If an array is given, it must be an associative array, where
the key is a Kind and the value is the name of a subclass of
{@see \Google\Cloud\Datastore\Entity}.
@type bool $sort If set to true, results in each set will be sorted
to match the order given in $keys. **Defaults to** `false`.
} |
| return |
array |
Returns an array with keys [`found`, `missing`, and `deferred`].
Members of `found` will be instance of
{@see \Google\Cloud\Datastore\Entity}. Members of `missing` and
`deferred` will be instance of {@see \Google\Cloud\Datastore\Key}. |
Example:
$transaction->rollback();
Example:
$result = $transaction->runQuery($query);
foreach ($result as $entity) {
echo $entity['firstName'];
}
|
public runQuery ( Google\Cloud\Datastore\Query\QueryInterface $query, array $options = [] ) : Generator |
|
$query |
Google\Cloud\Datastore\Query\QueryInterface |
The query object. |
|
$options |
array |
[optional] {
Configuration Options
@type string $className The name of the class to return results as.
Must be a subclass of {@see \Google\Cloud\Datastore\Entity}.
If not set, {@see \Google\Cloud\Datastore\Entity} will be used.
} |
| return |
Generator |
|
No service requests are run when this method is called.
Use {@see \Google\Cloud\Datastore\Transaction::commit()} to commit changes.
Example:
$entity['firstName'] = 'Bob';
$transaction->update($entity);
$transaction->commit();
|
public update ( Entity $entity, array $options = [] ) : Transaction |
|
$entity |
Entity |
The entity to update. |
|
$options |
array |
[optional] {
Configuration Options
@type bool $allowOverwrite Entities must be updated as an entire
resource. Patch operations are not supported. Because entities
can be created manually, or obtained by a lookup or query, it
is possible to accidentally overwrite an existing record with a
new one when manually creating an entity. To provide additional
safety, this flag must be set to `true` in order to update a
record when the entity provided was not obtained through a
lookup or query. **Defaults to** `false`.
} |
| return |
Transaction |
|
updateBatch()
public method
No service requests are run when this method is called.
Use {@see \Google\Cloud\Datastore\Transaction::commit()} to commit changes.
Example:
$entities[0]['firstName'] = 'Bob';
$entities[1]['firstName'] = 'John';
$transaction->updateBatch($entities);
$transaction->commit();
|
public updateBatch ( array $entities, array $options = [] ) : Transaction |
|
$entities |
array |
The entities to update. |
|
$options |
array |
[optional] {
Configuration Options
@type bool $allowOverwrite Entities must be updated as an entire
resource. Patch operations are not supported. Because entities
can be created manually, or obtained by a lookup or query, it
is possible to accidentally overwrite an existing record with a
new one when manually creating an entity. To provide additional
safety, this flag must be set to `true` in order to update a
record when the entity provided was not obtained through a
lookup or query. **Defaults to** `false`.
} |
| return |
Transaction |
|
No service requests are run when this method is called.
Use {@see \Google\Cloud\Datastore\Transaction::commit()} to commit changes.
Upsert will create a record if one does not already exist, or overwrite
existing record if one already exists.
Example:
$key = $datastore->key('Person', 'Bob');
$entity = $datastore->entity($key, ['firstName' => 'Bob']);
$transaction->upsert($entity);
$transaction->commit();
|
public upsert ( Entity $entity ) : Transaction |
|
$entity |
Entity |
The entity to upsert. |
| return |
Transaction |
|
upsertBatch()
public method
No service requests are run when this method is called.
Use {@see \Google\Cloud\Datastore\Transaction::commit()} to commit changes.
Upsert will create a record if one does not already exist, or overwrite
existing record if one already exists.
Example:
$keys = [
$datastore->key('Person', 'Bob'),
$datastore->key('Person', 'John')
];
$entities = [
$datastore->entity($keys[0], ['firstName' => 'Bob']),
$datastore->entity($keys[1], ['firstName' => 'John'])
];
$transaction->upsertBatch($entities);
$transaction->commit();
|
public upsertBatch ( array $entities ) : Transaction |
|
$entities |
array |
The entities to upsert. |
| return |
Transaction |
|