Cloud Spanner V1 Client - Class SpannerClient (1.62.1)

Reference documentation and code samples for the Cloud Spanner V1 Client class SpannerClient.

Service Description: Cloud Spanner API

The Cloud Spanner API can be used to manage sessions and execute transactions on data stored in Cloud Spanner databases.

This class provides the ability to make remote calls to the backing service through method calls that map to API methods. Sample code to get started:

$spannerClient = new SpannerClient();
try {
    $formattedDatabase = $spannerClient->databaseName('[PROJECT]', '[INSTANCE]', '[DATABASE]');
    $sessionCount = 0;
    $response = $spannerClient->batchCreateSessions($formattedDatabase, $sessionCount);
} finally {
    $spannerClient->close();
}

Many parameters require resource names to be formatted in a particular way. To assist with these names, this class includes a format method for each type of name, and additionally a parseName method to extract the individual identifiers contained within formatted names that are returned by the API.

This service has a new (beta) implementation. See Google\Cloud\Spanner\V1\Client\SpannerClient to use the new surface.

Namespace

Google \ Cloud \ Spanner \ V1

Methods

getTransport

Returns the underlying transport.

Returns
Type	Description
`Google\ApiCore\Transport\TransportInterface`

__construct

Constructor.

Parameters
Name	Description
`options`	`array` Optional. Options for configuring the service API wrapper.
`↳ apiEndpoint`	`string` The address of the API remote host. May optionally include the port, formatted as "
`↳ credentials`	`string\|array\|FetchAuthTokenInterface\|CredentialsWrapper` The credentials to be used by the client to authorize API calls. This option accepts either a path to a credentials file, or a decoded credentials file as a PHP array. Advanced usage: In addition, this option can also accept a pre-constructed Google\Auth\FetchAuthTokenInterface object or Google\ApiCore\CredentialsWrapper object. Note that when one of these objects are provided, any settings in $credentialsConfig will be ignored.
`↳ credentialsConfig`	`array` Options used to configure credentials, including auth token caching, for the client. For a full list of supporting configuration options, see Google\ApiCore\CredentialsWrapper::build() .
`↳ disableRetries`	`bool` Determines whether or not retries defined by the client configuration should be disabled. Defaults to `false`.
`↳ clientConfig`	`string\|array` Client method configuration, including retry settings. This option can be either a path to a JSON file, or a PHP array containing the decoded JSON data. By default this settings points to the default client config file, which is provided in the resources folder.
`↳ transport`	`string\|TransportInterface` The transport used for executing network requests. May be either the string `rest` or `grpc`. Defaults to `grpc` if gRPC support is detected on the system. Advanced usage: Additionally, it is possible to pass in an already instantiated Google\ApiCore\Transport\TransportInterface object. Note that when this object is provided, any settings in $transportConfig, and any $apiEndpoint setting, will be ignored.
`↳ transportConfig`	`array` Configuration options that will be used to construct the transport. Options for each supported transport type should be passed in a key for that transport. For example: $transportConfig = [ 'grpc' => [...], 'rest' => [...], ]; See the Google\ApiCore\Transport\GrpcTransport::build() and Google\ApiCore\Transport\RestTransport::build() methods for the supported options.
`↳ clientCertSource`	`callable` A callable which returns the client cert as a string. This can be used to provide a certificate and private key to the transport layer for mTLS.

batchCreateSessions

Creates multiple new sessions.

This API can be used to initialize a session cache on the clients. See https://goo.gl/TgSFN2 for best practices on session cache management.

Parameters
Name	Description
`database`	`string` Required. The database in which the new sessions are created.
`sessionCount`	`int` Required. The number of sessions to be created in this batch call. The API may return fewer than the requested number of sessions. If a specific number of sessions are desired, the client can make additional calls to BatchCreateSessions (adjusting session_count as necessary).
`optionalArgs`	`array` Optional.
`↳ sessionTemplate`	`Session` Parameters to be applied to each created session.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\BatchCreateSessionsResponse`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\BatchCreateSessionsResponse;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedDatabase The database in which the new sessions are created. Please see
 *                                  {@see SpannerClient::databaseName()} for help formatting this field.
 * @param int    $sessionCount      The number of sessions to be created in this batch call.
 *                                  The API may return fewer than the requested number of sessions. If a
 *                                  specific number of sessions are desired, the client can make additional
 *                                  calls to BatchCreateSessions (adjusting
 *                                  [session_count][google.spanner.v1.BatchCreateSessionsRequest.session_count] as necessary).
 */
function batch_create_sessions_sample(string $formattedDatabase, int $sessionCount): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Call the API and handle any network failures.
    try {
        /** @var BatchCreateSessionsResponse $response */
        $response = $spannerClient->batchCreateSessions($formattedDatabase, $sessionCount);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedDatabase = SpannerClient::databaseName('[PROJECT]', '[INSTANCE]', '[DATABASE]');
    $sessionCount = 0;

    batch_create_sessions_sample($formattedDatabase, $sessionCount);
}

beginTransaction

Begins a new transaction. This step can often be skipped: Read, ExecuteSql and Commit can begin a new transaction as a side-effect.

Parameters
Name	Description
`session`	`string` Required. The session in which the transaction runs.
`options`	`Google\Cloud\Spanner\V1\TransactionOptions` Required. Options for the new transaction.
`optionalArgs`	`array` Optional.
`↳ requestOptions`	`RequestOptions` Common options for this request. Priority is ignored for this request. Setting the priority in this request_options struct will not do anything. To set the priority for a transaction, set it on the reads and writes that are part of this transaction instead.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\Transaction`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\SpannerClient;
use Google\Cloud\Spanner\V1\Transaction;
use Google\Cloud\Spanner\V1\TransactionOptions;

/**
 * @param string $formattedSession The session in which the transaction runs. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 */
function begin_transaction_sample(string $formattedSession): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Prepare any non-scalar elements to be passed along with the request.
    $options = new TransactionOptions();

    // Call the API and handle any network failures.
    try {
        /** @var Transaction $response */
        $response = $spannerClient->beginTransaction($formattedSession, $options);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );

    begin_transaction_sample($formattedSession);
}

commit

Commits a transaction. The request includes the mutations to be applied to rows in the database.

Commit might return an ABORTED error. This can occur at any time; commonly, the cause is conflicts with concurrent transactions. However, it can also happen for a variety of other reasons. If Commit returns ABORTED, the caller should re-attempt the transaction from the beginning, re-using the same session.

On very rare occasions, Commit might return UNKNOWN. This can happen, for example, if the client job experiences a 1+ hour networking failure. At that point, Cloud Spanner has lost track of the transaction outcome and we recommend that you perform another read from the database to see the state of things as they are now.

Parameters
Name	Description
`session`	`string` Required. The session in which the transaction to be committed is running.
`mutations`	`array<Google\Cloud\Spanner\V1\Mutation>` The mutations to be executed when this transaction commits. All mutations are applied atomically, in the order they appear in this list.
`optionalArgs`	`array` Optional.
`↳ transactionId`	`string` Commit a previously-started transaction.
`↳ singleUseTransaction`	`TransactionOptions` Execute mutations in a temporary transaction. Note that unlike commit of a previously-started transaction, commit with a temporary transaction is non-idempotent. That is, if the `CommitRequest` is sent to Cloud Spanner more than once (for instance, due to retries in the application, or in the transport library), it is possible that the mutations are executed more than once. If this is undesirable, use BeginTransaction and Commit instead.
`↳ returnCommitStats`	`bool` If `true`, then statistics related to the transaction will be included in the CommitResponse. Default value is `false`.
`↳ requestOptions`	`RequestOptions` Common options for this request.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\CommitResponse`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\CommitResponse;
use Google\Cloud\Spanner\V1\Mutation;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedSession The session in which the transaction to be committed is running. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 */
function commit_sample(string $formattedSession): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Prepare any non-scalar elements to be passed along with the request.
    $mutations = [new Mutation()];

    // Call the API and handle any network failures.
    try {
        /** @var CommitResponse $response */
        $response = $spannerClient->commit($formattedSession, $mutations);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );

    commit_sample($formattedSession);
}

createSession

Creates a new session. A session can be used to perform transactions that read and/or modify data in a Cloud Spanner database.

Sessions are meant to be reused for many consecutive transactions.

Sessions can only execute one transaction at a time. To execute multiple concurrent read-write/write-only transactions, create multiple sessions. Note that standalone reads and queries use a transaction internally, and count toward the one transaction limit.

Active sessions use additional server resources, so it is a good idea to delete idle and unneeded sessions. Aside from explicit deletes, Cloud Spanner may delete sessions for which no operations are sent for more than an hour. If a session is deleted, requests to it return NOT_FOUND.

Idle sessions can be kept alive by sending a trivial SQL query periodically, e.g., "SELECT 1".

Parameters
Name	Description
`database`	`string` Required. The database in which the new session is created.
`optionalArgs`	`array` Optional.
`↳ session`	`Session` Required. The session to create.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\Session`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\Session;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedDatabase The database in which the new session is created. Please see
 *                                  {@see SpannerClient::databaseName()} for help formatting this field.
 */
function create_session_sample(string $formattedDatabase): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Call the API and handle any network failures.
    try {
        /** @var Session $response */
        $response = $spannerClient->createSession($formattedDatabase);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedDatabase = SpannerClient::databaseName('[PROJECT]', '[INSTANCE]', '[DATABASE]');

    create_session_sample($formattedDatabase);
}

deleteSession

Ends a session, releasing server resources associated with it. This will asynchronously trigger cancellation of any operations that are running with this session.

Parameters
Name	Description
`name`	`string` Required. The name of the session to delete.
`optionalArgs`	`array` Optional.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedName The name of the session to delete. Please see
 *                              {@see SpannerClient::sessionName()} for help formatting this field.
 */
function delete_session_sample(string $formattedName): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Call the API and handle any network failures.
    try {
        $spannerClient->deleteSession($formattedName);
        printf('Call completed successfully.' . PHP_EOL);
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedName = SpannerClient::sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');

    delete_session_sample($formattedName);
}

executeBatchDml

Executes a batch of SQL DML statements. This method allows many statements to be run with lower latency than submitting them sequentially with ExecuteSql.

Statements are executed in sequential order. A request can succeed even if a statement fails. The ExecuteBatchDmlResponse.status field in the response provides information about the statement that failed. Clients must inspect this field to determine whether an error occurred.

Execution stops after the first failed statement; the remaining statements are not executed.

Parameters
Name	Description
`session`	`string` Required. The session in which the DML statements should be performed.
`transaction`	`Google\Cloud\Spanner\V1\TransactionSelector` Required. The transaction to use. Must be a read-write transaction. To protect against replays, single-use transactions are not supported. The caller must either supply an existing transaction ID or begin a new transaction.
`statements`	`array<Google\Cloud\Spanner\V1\ExecuteBatchDmlRequest\Statement>` Required. The list of statements to execute in this batch. Statements are executed serially, such that the effects of statement `i` are visible to statement `i+1`. Each statement must be a DML statement. Execution stops at the first failed statement; the remaining statements are not executed. Callers must provide at least one statement.
`seqno`	`int` Required. A per-transaction sequence number used to identify this request. This field makes each request idempotent such that if the request is received multiple times, at most one will succeed. The sequence number must be monotonically increasing within the transaction. If a request arrives for the first time with an out-of-order sequence number, the transaction may be aborted. Replays of previously handled requests will yield the same response as the first execution.
`optionalArgs`	`array` Optional.
`↳ requestOptions`	`RequestOptions` Common options for this request.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\ExecuteBatchDmlResponse`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\ExecuteBatchDmlRequest\Statement;
use Google\Cloud\Spanner\V1\ExecuteBatchDmlResponse;
use Google\Cloud\Spanner\V1\SpannerClient;
use Google\Cloud\Spanner\V1\TransactionSelector;

/**
 * @param string $formattedSession The session in which the DML statements should be performed. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 * @param string $statementsSql    The DML string.
 * @param int    $seqno            A per-transaction sequence number used to identify this request. This field
 *                                 makes each request idempotent such that if the request is received multiple
 *                                 times, at most one will succeed.
 *
 *                                 The sequence number must be monotonically increasing within the
 *                                 transaction. If a request arrives for the first time with an out-of-order
 *                                 sequence number, the transaction may be aborted. Replays of previously
 *                                 handled requests will yield the same response as the first execution.
 */
function execute_batch_dml_sample(
    string $formattedSession,
    string $statementsSql,
    int $seqno
): void {
    // Create a client.
    $spannerClient = new SpannerClient();

    // Prepare any non-scalar elements to be passed along with the request.
    $transaction = new TransactionSelector();
    $statement = (new Statement())
        ->setSql($statementsSql);
    $statements = [$statement,];

    // Call the API and handle any network failures.
    try {
        /** @var ExecuteBatchDmlResponse $response */
        $response = $spannerClient->executeBatchDml($formattedSession, $transaction, $statements, $seqno);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );
    $statementsSql = '[SQL]';
    $seqno = 0;

    execute_batch_dml_sample($formattedSession, $statementsSql, $seqno);
}

executeSql

Executes an SQL statement, returning all results in a single reply. This method cannot be used to return a result set larger than 10 MiB; if the query yields more data than that, the query fails with a FAILED_PRECONDITION error.

Operations inside read-write transactions might return ABORTED. If this occurs, the application should restart the transaction from the beginning. See Transaction for more details.

Larger result sets can be fetched in streaming fashion by calling ExecuteStreamingSql instead.

Parameters
Name	Description
`session`	`string` Required. The session in which the SQL query should be performed.
`sql`	`string` Required. The SQL string.
`optionalArgs`	`array` Optional.
`↳ transaction`	`TransactionSelector` The transaction to use. For queries, if none is provided, the default is a temporary read-only transaction with strong concurrency. Standard DML statements require a read-write transaction. To protect against replays, single-use transactions are not supported. The caller must either supply an existing transaction ID or begin a new transaction. Partitioned DML requires an existing Partitioned DML transaction ID.
`↳ params`	`Struct` Parameter names and values that bind to placeholders in the SQL string. A parameter placeholder consists of the `@` character followed by the parameter name (for example, `@firstName`). Parameter names must conform to the naming requirements of identifiers as specified at https://cloud.google.com/spanner/docs/lexical#identifiers. Parameters can appear anywhere that a literal value is expected. The same parameter name can be used more than once, for example: `"WHERE id > @msg_id AND id < @msg_id + 100"` It is an error to execute a SQL statement with unbound parameters.
`↳ paramTypes`	`array` It is not always possible for Cloud Spanner to infer the right SQL type from a JSON value. For example, values of type `BYTES` and values of type `STRING` both appear in params as JSON strings. In these cases, `param_types` can be used to specify the exact SQL type for some or all of the SQL statement parameters. See the definition of Type for more information about SQL types.
`↳ resumeToken`	`string` If this request is resuming a previously interrupted SQL statement execution, `resume_token` should be copied from the last PartialResultSet yielded before the interruption. Doing this enables the new SQL statement execution to resume where the last one left off. The rest of the request parameters must exactly match the request that yielded this token.
`↳ queryMode`	`int` Used to control the amount of debugging information returned in ResultSetStats. If partition_token is set, query_mode can only be set to QueryMode.NORMAL. For allowed values, use constants defined on Google\Cloud\Spanner\V1\ExecuteSqlRequest\QueryMode
`↳ partitionToken`	`string` If present, results will be restricted to the specified partition previously created using PartitionQuery(). There must be an exact match for the values of fields common to this message and the PartitionQueryRequest message used to create this partition_token.
`↳ seqno`	`int` A per-transaction sequence number used to identify this request. This field makes each request idempotent such that if the request is received multiple times, at most one will succeed. The sequence number must be monotonically increasing within the transaction. If a request arrives for the first time with an out-of-order sequence number, the transaction may be aborted. Replays of previously handled requests will yield the same response as the first execution. Required for DML statements. Ignored for queries.
`↳ queryOptions`	`QueryOptions` Query optimizer configuration to use for the given query.
`↳ requestOptions`	`RequestOptions` Common options for this request.
`↳ dataBoostEnabled`	`bool` If this is for a partitioned query and this field is set to `true`, the request will be executed via Spanner independent compute resources. If the field is set to `true` but the request does not set `partition_token`, the API will return an `INVALID_ARGUMENT` error.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\ResultSet`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\ResultSet;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedSession The session in which the SQL query should be performed. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 * @param string $sql              The SQL string.
 */
function execute_sql_sample(string $formattedSession, string $sql): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Call the API and handle any network failures.
    try {
        /** @var ResultSet $response */
        $response = $spannerClient->executeSql($formattedSession, $sql);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );
    $sql = '[SQL]';

    execute_sql_sample($formattedSession, $sql);
}

executeStreamingSql

Like ExecuteSql, except returns the result set as a stream. Unlike ExecuteSql, there is no limit on the size of the returned result set. However, no individual row in the result set can exceed 100 MiB, and no column value can exceed 10 MiB.

Parameters
Name	Description
`session`	`string` Required. The session in which the SQL query should be performed.
`sql`	`string` Required. The SQL string.
`optionalArgs`	`array` Optional.
`↳ transaction`	`TransactionSelector` The transaction to use. For queries, if none is provided, the default is a temporary read-only transaction with strong concurrency. Standard DML statements require a read-write transaction. To protect against replays, single-use transactions are not supported. The caller must either supply an existing transaction ID or begin a new transaction. Partitioned DML requires an existing Partitioned DML transaction ID.
`↳ params`	`Struct` Parameter names and values that bind to placeholders in the SQL string. A parameter placeholder consists of the `@` character followed by the parameter name (for example, `@firstName`). Parameter names must conform to the naming requirements of identifiers as specified at https://cloud.google.com/spanner/docs/lexical#identifiers. Parameters can appear anywhere that a literal value is expected. The same parameter name can be used more than once, for example: `"WHERE id > @msg_id AND id < @msg_id + 100"` It is an error to execute a SQL statement with unbound parameters.
`↳ paramTypes`	`array` It is not always possible for Cloud Spanner to infer the right SQL type from a JSON value. For example, values of type `BYTES` and values of type `STRING` both appear in params as JSON strings. In these cases, `param_types` can be used to specify the exact SQL type for some or all of the SQL statement parameters. See the definition of Type for more information about SQL types.
`↳ resumeToken`	`string` If this request is resuming a previously interrupted SQL statement execution, `resume_token` should be copied from the last PartialResultSet yielded before the interruption. Doing this enables the new SQL statement execution to resume where the last one left off. The rest of the request parameters must exactly match the request that yielded this token.
`↳ queryMode`	`int` Used to control the amount of debugging information returned in ResultSetStats. If partition_token is set, query_mode can only be set to QueryMode.NORMAL. For allowed values, use constants defined on Google\Cloud\Spanner\V1\ExecuteSqlRequest\QueryMode
`↳ partitionToken`	`string` If present, results will be restricted to the specified partition previously created using PartitionQuery(). There must be an exact match for the values of fields common to this message and the PartitionQueryRequest message used to create this partition_token.
`↳ seqno`	`int` A per-transaction sequence number used to identify this request. This field makes each request idempotent such that if the request is received multiple times, at most one will succeed. The sequence number must be monotonically increasing within the transaction. If a request arrives for the first time with an out-of-order sequence number, the transaction may be aborted. Replays of previously handled requests will yield the same response as the first execution. Required for DML statements. Ignored for queries.
`↳ queryOptions`	`QueryOptions` Query optimizer configuration to use for the given query.
`↳ requestOptions`	`RequestOptions` Common options for this request.
`↳ dataBoostEnabled`	`bool` If this is for a partitioned query and this field is set to `true`, the request will be executed via Spanner independent compute resources. If the field is set to `true` but the request does not set `partition_token`, the API will return an `INVALID_ARGUMENT` error.
`↳ timeoutMillis`	`int` Timeout to use for this call.

Returns
Type	Description
`Google\ApiCore\ServerStream`

Example

use Google\ApiCore\ApiException;
use Google\ApiCore\ServerStream;
use Google\Cloud\Spanner\V1\PartialResultSet;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedSession The session in which the SQL query should be performed. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 * @param string $sql              The SQL string.
 */
function execute_streaming_sql_sample(string $formattedSession, string $sql): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Call the API and handle any network failures.
    try {
        /** @var ServerStream $stream */
        $stream = $spannerClient->executeStreamingSql($formattedSession, $sql);

        /** @var PartialResultSet $element */
        foreach ($stream->readAll() as $element) {
            printf('Element data: %s' . PHP_EOL, $element->serializeToJsonString());
        }
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );
    $sql = '[SQL]';

    execute_streaming_sql_sample($formattedSession, $sql);
}

getSession

Gets a session. Returns NOT_FOUND if the session does not exist.

This is mainly useful for determining whether a session is still alive.

Parameters
Name	Description
`name`	`string` Required. The name of the session to retrieve.
`optionalArgs`	`array` Optional.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\Session`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\Session;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedName The name of the session to retrieve. Please see
 *                              {@see SpannerClient::sessionName()} for help formatting this field.
 */
function get_session_sample(string $formattedName): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Call the API and handle any network failures.
    try {
        /** @var Session $response */
        $response = $spannerClient->getSession($formattedName);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedName = SpannerClient::sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');

    get_session_sample($formattedName);
}

listSessions

Lists all sessions in a given database.

Parameters
Name	Description
`database`	`string` Required. The database in which to list sessions.
`optionalArgs`	`array` Optional.
`↳ pageSize`	`int` The maximum number of resources contained in the underlying API response. The API may return fewer values in a page, even if there are additional values to be retrieved.
`↳ pageToken`	`string` A page token is used to specify a page of values to be returned. If no page token is specified (the default), the first page of values will be returned. Any page token used here must have been generated by a previous call to the API.
`↳ filter`	`string` An expression for filtering the results of the request. Filter rules are case insensitive. The fields eligible for filtering are: * `labels.key` where key is the name of a label Some examples of using filters are: * `labels.env:` --> The session has the label "env". `labels.env:dev` --> The session has the label "env" and the value of the label contains the string "dev".
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\ApiCore\PagedListResponse`

Example

use Google\ApiCore\ApiException;
use Google\ApiCore\PagedListResponse;
use Google\Cloud\Spanner\V1\Session;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedDatabase The database in which to list sessions. Please see
 *                                  {@see SpannerClient::databaseName()} for help formatting this field.
 */
function list_sessions_sample(string $formattedDatabase): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Call the API and handle any network failures.
    try {
        /** @var PagedListResponse $response */
        $response = $spannerClient->listSessions($formattedDatabase);

        /** @var Session $element */
        foreach ($response as $element) {
            printf('Element data: %s' . PHP_EOL, $element->serializeToJsonString());
        }
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedDatabase = SpannerClient::databaseName('[PROJECT]', '[INSTANCE]', '[DATABASE]');

    list_sessions_sample($formattedDatabase);
}

partitionQuery

Creates a set of partition tokens that can be used to execute a query operation in parallel. Each of the returned partition tokens can be used by ExecuteStreamingSql to specify a subset of the query result to read. The same session and read-only transaction must be used by the PartitionQueryRequest used to create the partition tokens and the ExecuteSqlRequests that use the partition tokens.

Partition tokens become invalid when the session used to create them is deleted, is idle for too long, begins a new transaction, or becomes too old. When any of these happen, it is not possible to resume the query, and the whole operation must be restarted from the beginning.

Parameters
Name	Description
`session`	`string` Required. The session used to create the partitions.
`sql`	`string` Required. The query request to generate partitions for. The request will fail if the query is not root partitionable. The query plan of a root partitionable query has a single distributed union operator. A distributed union operator conceptually divides one or more tables into multiple splits, remotely evaluates a subquery independently on each split, and then unions all results. This must not contain DML commands, such as INSERT, UPDATE, or DELETE. Use ExecuteStreamingSql with a PartitionedDml transaction for large, partition-friendly DML operations.
`optionalArgs`	`array` Optional.
`↳ transaction`	`TransactionSelector` Read only snapshot transactions are supported, read/write and single use transactions are not.
`↳ params`	`Struct` Parameter names and values that bind to placeholders in the SQL string. A parameter placeholder consists of the `@` character followed by the parameter name (for example, `@firstName`). Parameter names can contain letters, numbers, and underscores. Parameters can appear anywhere that a literal value is expected. The same parameter name can be used more than once, for example: `"WHERE id > @msg_id AND id < @msg_id + 100"` It is an error to execute a SQL statement with unbound parameters.
`↳ paramTypes`	`array` It is not always possible for Cloud Spanner to infer the right SQL type from a JSON value. For example, values of type `BYTES` and values of type `STRING` both appear in params as JSON strings. In these cases, `param_types` can be used to specify the exact SQL type for some or all of the SQL query parameters. See the definition of Type for more information about SQL types.
`↳ partitionOptions`	`PartitionOptions` Additional options that affect how many partitions are created.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\PartitionResponse`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\PartitionResponse;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedSession The session used to create the partitions. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 * @param string $sql              The query request to generate partitions for. The request will fail if
 *                                 the query is not root partitionable. The query plan of a root
 *                                 partitionable query has a single distributed union operator. A distributed
 *                                 union operator conceptually divides one or more tables into multiple
 *                                 splits, remotely evaluates a subquery independently on each split, and
 *                                 then unions all results.
 *
 *                                 This must not contain DML commands, such as INSERT, UPDATE, or
 *                                 DELETE. Use [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql] with a
 *                                 PartitionedDml transaction for large, partition-friendly DML operations.
 */
function partition_query_sample(string $formattedSession, string $sql): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Call the API and handle any network failures.
    try {
        /** @var PartitionResponse $response */
        $response = $spannerClient->partitionQuery($formattedSession, $sql);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );
    $sql = '[SQL]';

    partition_query_sample($formattedSession, $sql);
}

partitionRead

Creates a set of partition tokens that can be used to execute a read operation in parallel. Each of the returned partition tokens can be used by StreamingRead to specify a subset of the read result to read. The same session and read-only transaction must be used by the PartitionReadRequest used to create the partition tokens and the ReadRequests that use the partition tokens. There are no ordering guarantees on rows returned among the returned partition tokens, or even within each individual StreamingRead call issued with a partition_token.

Partition tokens become invalid when the session used to create them is deleted, is idle for too long, begins a new transaction, or becomes too old. When any of these happen, it is not possible to resume the read, and the whole operation must be restarted from the beginning.

Parameters
Name	Description
`session`	`string` Required. The session used to create the partitions.
`table`	`string` Required. The name of the table in the database to be read.
`keySet`	`Google\Cloud\Spanner\V1\KeySet` Required. `key_set` identifies the rows to be yielded. `key_set` names the primary keys of the rows in table to be yielded, unless index is present. If index is present, then key_set instead names index keys in index. It is not an error for the `key_set` to name rows that do not exist in the database. Read yields nothing for nonexistent rows.
`optionalArgs`	`array` Optional.
`↳ transaction`	`TransactionSelector` Read only snapshot transactions are supported, read/write and single use transactions are not.
`↳ index`	`string` If non-empty, the name of an index on table. This index is used instead of the table primary key when interpreting key_set and sorting result rows. See key_set for further information.
`↳ columns`	`string[]` The columns of table to be returned for each row matching this request.
`↳ partitionOptions`	`PartitionOptions` Additional options that affect how many partitions are created.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\PartitionResponse`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\KeySet;
use Google\Cloud\Spanner\V1\PartitionResponse;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedSession The session used to create the partitions. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 * @param string $table            The name of the table in the database to be read.
 */
function partition_read_sample(string $formattedSession, string $table): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Prepare any non-scalar elements to be passed along with the request.
    $keySet = new KeySet();

    // Call the API and handle any network failures.
    try {
        /** @var PartitionResponse $response */
        $response = $spannerClient->partitionRead($formattedSession, $table, $keySet);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );
    $table = '[TABLE]';

    partition_read_sample($formattedSession, $table);
}

read

Reads rows from the database using key lookups and scans, as a simple key/value style alternative to ExecuteSql. This method cannot be used to return a result set larger than 10 MiB; if the read matches more data than that, the read fails with a FAILED_PRECONDITION error.

Reads inside read-write transactions might return ABORTED. If this occurs, the application should restart the transaction from the beginning. See Transaction for more details.

Larger result sets can be yielded in streaming fashion by calling StreamingRead instead.

Parameters
Name	Description
`session`	`string` Required. The session in which the read should be performed.
`table`	`string` Required. The name of the table in the database to be read.
`columns`	`string[]` Required. The columns of table to be returned for each row matching this request.
`keySet`	`Google\Cloud\Spanner\V1\KeySet` Required. `key_set` identifies the rows to be yielded. `key_set` names the primary keys of the rows in table to be yielded, unless index is present. If index is present, then key_set instead names index keys in index. If the partition_token field is empty, rows are yielded in table primary key order (if index is empty) or index key order (if index is non-empty). If the partition_token field is not empty, rows will be yielded in an unspecified order. It is not an error for the `key_set` to name rows that do not exist in the database. Read yields nothing for nonexistent rows.
`optionalArgs`	`array` Optional.
`↳ transaction`	`TransactionSelector` The transaction to use. If none is provided, the default is a temporary read-only transaction with strong concurrency.
`↳ index`	`string` If non-empty, the name of an index on table. This index is used instead of the table primary key when interpreting key_set and sorting result rows. See key_set for further information.
`↳ limit`	`int` If greater than zero, only the first `limit` rows are yielded. If `limit` is zero, the default is no limit. A limit cannot be specified if `partition_token` is set.
`↳ resumeToken`	`string` If this request is resuming a previously interrupted read, `resume_token` should be copied from the last PartialResultSet yielded before the interruption. Doing this enables the new read to resume where the last read left off. The rest of the request parameters must exactly match the request that yielded this token.
`↳ partitionToken`	`string` If present, results will be restricted to the specified partition previously created using PartitionRead(). There must be an exact match for the values of fields common to this message and the PartitionReadRequest message used to create this partition_token.
`↳ requestOptions`	`RequestOptions` Common options for this request.
`↳ dataBoostEnabled`	`bool` If this is for a partitioned read and this field is set to `true`, the request will be executed via Spanner independent compute resources. If the field is set to `true` but the request does not set `partition_token`, the API will return an `INVALID_ARGUMENT` error.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Returns
Type	Description
`Google\Cloud\Spanner\V1\ResultSet`

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\KeySet;
use Google\Cloud\Spanner\V1\ResultSet;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedSession The session in which the read should be performed. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 * @param string $table            The name of the table in the database to be read.
 * @param string $columnsElement   The columns of [table][google.spanner.v1.ReadRequest.table] to be returned for each row matching
 *                                 this request.
 */
function read_sample(string $formattedSession, string $table, string $columnsElement): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Prepare any non-scalar elements to be passed along with the request.
    $columns = [$columnsElement,];
    $keySet = new KeySet();

    // Call the API and handle any network failures.
    try {
        /** @var ResultSet $response */
        $response = $spannerClient->read($formattedSession, $table, $columns, $keySet);
        printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );
    $table = '[TABLE]';
    $columnsElement = '[COLUMNS]';

    read_sample($formattedSession, $table, $columnsElement);
}

rollback

Rolls back a transaction, releasing any locks it holds. It is a good idea to call this for any transaction that includes one or more Read or ExecuteSql requests and ultimately decides not to commit.

Rollback returns OK if it successfully aborts the transaction, the transaction was already aborted, or the transaction is not found. Rollback never returns ABORTED.

Parameters
Name	Description
`session`	`string` Required. The session in which the transaction to roll back is running.
`transactionId`	`string` Required. The transaction to roll back.
`optionalArgs`	`array` Optional.
`↳ retrySettings`	`RetrySettings\|array` Retry settings to use for this call. Can be a Google\ApiCore\RetrySettings object, or an associative array of retry settings parameters. See the documentation on Google\ApiCore\RetrySettings for example usage.

Example

use Google\ApiCore\ApiException;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedSession The session in which the transaction to roll back is running. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 * @param string $transactionId    The transaction to roll back.
 */
function rollback_sample(string $formattedSession, string $transactionId): void
{
    // Create a client.
    $spannerClient = new SpannerClient();

    // Call the API and handle any network failures.
    try {
        $spannerClient->rollback($formattedSession, $transactionId);
        printf('Call completed successfully.' . PHP_EOL);
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );
    $transactionId = '...';

    rollback_sample($formattedSession, $transactionId);
}

streamingRead

Like Read, except returns the result set as a stream. Unlike Read, there is no limit on the size of the returned result set. However, no individual row in the result set can exceed 100 MiB, and no column value can exceed 10 MiB.

Parameters
Name	Description
`session`	`string` Required. The session in which the read should be performed.
`table`	`string` Required. The name of the table in the database to be read.
`columns`	`string[]` Required. The columns of table to be returned for each row matching this request.
`keySet`	`Google\Cloud\Spanner\V1\KeySet` Required. `key_set` identifies the rows to be yielded. `key_set` names the primary keys of the rows in table to be yielded, unless index is present. If index is present, then key_set instead names index keys in index. If the partition_token field is empty, rows are yielded in table primary key order (if index is empty) or index key order (if index is non-empty). If the partition_token field is not empty, rows will be yielded in an unspecified order. It is not an error for the `key_set` to name rows that do not exist in the database. Read yields nothing for nonexistent rows.
`optionalArgs`	`array` Optional.
`↳ transaction`	`TransactionSelector` The transaction to use. If none is provided, the default is a temporary read-only transaction with strong concurrency.
`↳ index`	`string` If non-empty, the name of an index on table. This index is used instead of the table primary key when interpreting key_set and sorting result rows. See key_set for further information.
`↳ limit`	`int` If greater than zero, only the first `limit` rows are yielded. If `limit` is zero, the default is no limit. A limit cannot be specified if `partition_token` is set.
`↳ resumeToken`	`string` If this request is resuming a previously interrupted read, `resume_token` should be copied from the last PartialResultSet yielded before the interruption. Doing this enables the new read to resume where the last read left off. The rest of the request parameters must exactly match the request that yielded this token.
`↳ partitionToken`	`string` If present, results will be restricted to the specified partition previously created using PartitionRead(). There must be an exact match for the values of fields common to this message and the PartitionReadRequest message used to create this partition_token.
`↳ requestOptions`	`RequestOptions` Common options for this request.
`↳ dataBoostEnabled`	`bool` If this is for a partitioned read and this field is set to `true`, the request will be executed via Spanner independent compute resources. If the field is set to `true` but the request does not set `partition_token`, the API will return an `INVALID_ARGUMENT` error.
`↳ timeoutMillis`	`int` Timeout to use for this call.

Returns
Type	Description
`Google\ApiCore\ServerStream`

Example

use Google\ApiCore\ApiException;
use Google\ApiCore\ServerStream;
use Google\Cloud\Spanner\V1\KeySet;
use Google\Cloud\Spanner\V1\PartialResultSet;
use Google\Cloud\Spanner\V1\SpannerClient;

/**
 * @param string $formattedSession The session in which the read should be performed. Please see
 *                                 {@see SpannerClient::sessionName()} for help formatting this field.
 * @param string $table            The name of the table in the database to be read.
 * @param string $columnsElement   The columns of [table][google.spanner.v1.ReadRequest.table] to be returned for each row matching
 *                                 this request.
 */
function streaming_read_sample(
    string $formattedSession,
    string $table,
    string $columnsElement
): void {
    // Create a client.
    $spannerClient = new SpannerClient();

    // Prepare any non-scalar elements to be passed along with the request.
    $columns = [$columnsElement,];
    $keySet = new KeySet();

    // Call the API and handle any network failures.
    try {
        /** @var ServerStream $stream */
        $stream = $spannerClient->streamingRead($formattedSession, $table, $columns, $keySet);

        /** @var PartialResultSet $element */
        foreach ($stream->readAll() as $element) {
            printf('Element data: %s' . PHP_EOL, $element->serializeToJsonString());
        }
    } catch (ApiException $ex) {
        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
    }
}

/**
 * Helper to execute the sample.
 *
 * This sample has been automatically generated and should be regarded as a code
 * template only. It will require modifications to work:
 *  - It may require correct/in-range values for request initialization.
 *  - It may require specifying regional endpoints when creating the service client,
 *    please see the apiEndpoint client configuration option for more details.
 */
function callSample(): void
{
    $formattedSession = SpannerClient::sessionName(
        '[PROJECT]',
        '[INSTANCE]',
        '[DATABASE]',
        '[SESSION]'
    );
    $table = '[TABLE]';
    $columnsElement = '[COLUMNS]';

    streaming_read_sample($formattedSession, $table, $columnsElement);
}

static::databaseName

Formats a string containing the fully-qualified path to represent a database resource.

Parameters
Name	Description
`project`	`string`
`instance`	`string`
`database`	`string`

Returns
Type	Description
`string`	The formatted database resource.

static::sessionName

Formats a string containing the fully-qualified path to represent a session resource.

Parameters
Name	Description
`project`	`string`
`instance`	`string`
`database`	`string`
`session`	`string`

Returns
Type	Description
`string`	The formatted session resource.

static::parseName

Parses a formatted name string and returns an associative array of the components in the name.

The following name formats are supported: Template: Pattern

database: projects/{project}/instances/{instance}/databases/{database}
session: projects/{project}/instances/{instance}/databases/{database}/sessions/{session}

The optional $template argument can be supplied to specify a particular pattern, and must match one of the templates listed above. If no $template argument is provided, or if the $template argument does not match one of the templates listed, then parseName will check each of the supported templates, and return the first match.

Parameters
Name	Description
`formattedName`	`string` The formatted name string
`template`	`string` Optional name of template to match

Returns
Type	Description
`array`	An associative array from name component IDs to component values.

Constants

SERVICE_NAME

Value: 'google.spanner.v1.Spanner'

The name of the service.

SERVICE_ADDRESS

Value: 'spanner.googleapis.com'

The default address of the service.

DEFAULT_SERVICE_PORT

Value: 443

The default port of the service.

CODEGEN_NAME

Value: 'gapic'

The name of the code generator, to be included in the agent header.