Reference documentation and code samples for the Google BigQuery Storage V1 Client class BigQueryReadClient.
Service Description: BigQuery Read API.
The Read API can be used to read data from BigQuery.
This class provides the ability to make remote calls to the backing service through method calls that map to API methods.
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.
Namespace
Google \ Cloud \ BigQuery \ Storage \ V1 \ ClientMethods
__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 |
↳ 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 |
↳ 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. |
↳ logger |
false|LoggerInterface
A PSR-3 compliant logger. If set to false, logging is disabled, ignoring the 'GOOGLE_SDK_PHP_LOGGING' environment flag |
createReadSession
Creates a new read session. A read session divides the contents of a BigQuery table into one or more streams, which can then be used to read data from the table. The read session also specifies properties of the data to be read, such as a list of columns or a push-down filter describing the rows to be returned.
A particular row can be read by at most one stream. When the caller has reached the end of each stream in the session, then all the data in the table has been read.
Data is assigned to each stream such that roughly the same number of rows can be read from each stream. Because the server-side unit for assigning data is collections of rows, the API does not guarantee that each stream will return the same number or rows. Additionally, the limits are enforced based on the number of pre-filtered rows, so some filters can lead to lopsided assignments.
Read sessions automatically expire 6 hours after they are created and do not require manual clean-up by the caller.
The async variant is BigQueryReadClient::createReadSessionAsync() .
Parameters | |
---|---|
Name | Description |
request |
Google\Cloud\BigQuery\Storage\V1\CreateReadSessionRequest
A request to house fields associated with the call. |
callOptions |
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\BigQuery\Storage\V1\ReadSession |
use Google\ApiCore\ApiException;
use Google\Cloud\BigQuery\Storage\V1\Client\BigQueryReadClient;
use Google\Cloud\BigQuery\Storage\V1\CreateReadSessionRequest;
use Google\Cloud\BigQuery\Storage\V1\ReadSession;
/**
* @param string $formattedParent The request project that owns the session, in the form of
* `projects/{project_id}`. Please see
* {@see BigQueryReadClient::projectName()} for help formatting this field.
*/
function create_read_session_sample(string $formattedParent): void
{
// Create a client.
$bigQueryReadClient = new BigQueryReadClient();
// Prepare the request message.
$readSession = new ReadSession();
$request = (new CreateReadSessionRequest())
->setParent($formattedParent)
->setReadSession($readSession);
// Call the API and handle any network failures.
try {
/** @var ReadSession $response */
$response = $bigQueryReadClient->createReadSession($request);
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
{
$formattedParent = BigQueryReadClient::projectName('[PROJECT]');
create_read_session_sample($formattedParent);
}
readRows
Reads rows from the stream in the format prescribed by the ReadSession.
Each response contains one or more table rows, up to a maximum of 100 MiB per response; read requests which attempt to read individual rows larger than 100 MiB will fail.
Each request also returns a set of stream statistics reflecting the current state of the stream.
Parameters | |
---|---|
Name | Description |
request |
Google\Cloud\BigQuery\Storage\V1\ReadRowsRequest
A request to house fields associated with the call. |
callOptions |
array
Optional. |
↳ timeoutMillis |
int
Timeout to use for this call. |
Returns | |
---|---|
Type | Description |
Google\ApiCore\ServerStream |
use Google\ApiCore\ApiException;
use Google\ApiCore\ServerStream;
use Google\Cloud\BigQuery\Storage\V1\Client\BigQueryReadClient;
use Google\Cloud\BigQuery\Storage\V1\ReadRowsRequest;
use Google\Cloud\BigQuery\Storage\V1\ReadRowsResponse;
/**
* @param string $formattedReadStream Stream to read rows from. Please see
* {@see BigQueryReadClient::readStreamName()} for help formatting this field.
*/
function read_rows_sample(string $formattedReadStream): void
{
// Create a client.
$bigQueryReadClient = new BigQueryReadClient();
// Prepare the request message.
$request = (new ReadRowsRequest())
->setReadStream($formattedReadStream);
// Call the API and handle any network failures.
try {
/** @var ServerStream $stream */
$stream = $bigQueryReadClient->readRows($request);
/** @var ReadRowsResponse $element */
foreach ($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
{
$formattedReadStream = BigQueryReadClient::readStreamName(
'[PROJECT]',
'[LOCATION]',
'[SESSION]',
'[STREAM]'
);
read_rows_sample($formattedReadStream);
}
splitReadStream
Splits a given ReadStream
into two ReadStream
objects. These
ReadStream
objects are referred to as the primary and the residual
streams of the split. The original ReadStream
can still be read from in
the same manner as before. Both of the returned ReadStream
objects can
also be read from, and the rows returned by both child streams will be
the same as the rows read from the original stream.
Moreover, the two child streams will be allocated back-to-back in the
original ReadStream
. Concretely, it is guaranteed that for streams
original, primary, and residual, that original[0-j] = primary[0-j] and
original[j-n] = residual[0-m] once the streams have been read to
completion.
The async variant is BigQueryReadClient::splitReadStreamAsync() .
Parameters | |
---|---|
Name | Description |
request |
Google\Cloud\BigQuery\Storage\V1\SplitReadStreamRequest
A request to house fields associated with the call. |
callOptions |
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\BigQuery\Storage\V1\SplitReadStreamResponse |
use Google\ApiCore\ApiException;
use Google\Cloud\BigQuery\Storage\V1\Client\BigQueryReadClient;
use Google\Cloud\BigQuery\Storage\V1\SplitReadStreamRequest;
use Google\Cloud\BigQuery\Storage\V1\SplitReadStreamResponse;
/**
* @param string $formattedName Name of the stream to split. Please see
* {@see BigQueryReadClient::readStreamName()} for help formatting this field.
*/
function split_read_stream_sample(string $formattedName): void
{
// Create a client.
$bigQueryReadClient = new BigQueryReadClient();
// Prepare the request message.
$request = (new SplitReadStreamRequest())
->setName($formattedName);
// Call the API and handle any network failures.
try {
/** @var SplitReadStreamResponse $response */
$response = $bigQueryReadClient->splitReadStream($request);
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
{
$formattedName = BigQueryReadClient::readStreamName(
'[PROJECT]',
'[LOCATION]',
'[SESSION]',
'[STREAM]'
);
split_read_stream_sample($formattedName);
}
createReadSessionAsync
Parameters | |
---|---|
Name | Description |
request |
Google\Cloud\BigQuery\Storage\V1\CreateReadSessionRequest
|
optionalArgs |
array
|
Returns | |
---|---|
Type | Description |
GuzzleHttp\Promise\PromiseInterface<Google\Cloud\BigQuery\Storage\V1\ReadSession> |
splitReadStreamAsync
Parameters | |
---|---|
Name | Description |
request |
Google\Cloud\BigQuery\Storage\V1\SplitReadStreamRequest
|
optionalArgs |
array
|
Returns | |
---|---|
Type | Description |
GuzzleHttp\Promise\PromiseInterface<Google\Cloud\BigQuery\Storage\V1\SplitReadStreamResponse> |
static::projectName
Formats a string containing the fully-qualified path to represent a project resource.
Parameter | |
---|---|
Name | Description |
project |
string
|
Returns | |
---|---|
Type | Description |
string |
The formatted project resource. |
static::readSessionName
Formats a string containing the fully-qualified path to represent a read_session resource.
Parameters | |
---|---|
Name | Description |
project |
string
|
location |
string
|
session |
string
|
Returns | |
---|---|
Type | Description |
string |
The formatted read_session resource. |
static::readStreamName
Formats a string containing the fully-qualified path to represent a read_stream resource.
Parameters | |
---|---|
Name | Description |
project |
string
|
location |
string
|
session |
string
|
stream |
string
|
Returns | |
---|---|
Type | Description |
string |
The formatted read_stream resource. |
static::tableName
Formats a string containing the fully-qualified path to represent a table resource.
Parameters | |
---|---|
Name | Description |
project |
string
|
dataset |
string
|
table |
string
|
Returns | |
---|---|
Type | Description |
string |
The formatted table 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
- project: projects/{project}
- readSession: projects/{project}/locations/{location}/sessions/{session}
- readStream: projects/{project}/locations/{location}/sessions/{session}/streams/{stream}
- table: projects/{project}/datasets/{dataset}/tables/{table}
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. |