As of January 1, 2020 this library no longer supports Python 2 on the latest released version. Library versions released prior to that date will continue to be available. For more information please visit Python 2 support on Google Cloud.

BigQueryRead¶

class google.cloud.bigquery_storage_v1.services.big_query_read.BigQueryReadAsyncClient(*, credentials: typing.Optional[google.auth.credentials.Credentials] = None, transport: typing.Optional[typing.Union[str, google.cloud.bigquery_storage_v1.services.big_query_read.transports.base.BigQueryReadTransport, typing.Callable[[...], google.cloud.bigquery_storage_v1.services.big_query_read.transports.base.BigQueryReadTransport]]] = 'grpc_asyncio', client_options: typing.Optional[google.api_core.client_options.ClientOptions] = None, client_info: google.api_core.gapic_v1.client_info.ClientInfo = <google.api_core.gapic_v1.client_info.ClientInfo object>)[source]¶

BigQuery Read API.

The Read API can be used to read data from BigQuery.

Instantiates the big query read async client.

Parameters

credentials (Optional[google.auth.credentials.Credentials]) – The authorization credentials to attach to requests. These credentials identify the application to the service; if none are specified, the client will attempt to ascertain the credentials from the environment.
transport (Optional[Union[str,BigQueryReadTransport,Callable[..., BigQueryReadTransport]]]) – The transport to use, or a Callable that constructs and returns a new transport to use. If a Callable is given, it will be called with the same set of initialization arguments as used in the BigQueryReadTransport constructor. If set to None, a transport is chosen automatically.
client_options (Optional[Union[google.api_core.client_options.ClientOptions, dict]]) –
Custom options for the client.

1. The api_endpoint property can be used to override the default endpoint provided by the client when transport is not explicitly provided. Only if this property is not set and transport was not explicitly provided, the endpoint is determined by the GOOGLE_API_USE_MTLS_ENDPOINT environment variable, which have one of the following values: “always” (always use the default mTLS endpoint), “never” (always use the default regular endpoint) and “auto” (auto-switch to the default mTLS endpoint if client certificate is present; this is the default value).

2. If the GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable is “true”, then the client_cert_source property can be used to provide a client certificate for mTLS transport. If not provided, the default SSL client certificate will be used if present. If GOOGLE_API_USE_CLIENT_CERTIFICATE is “false” or not set, no client certificate will be used.

3. The universe_domain property can be used to override the default “googleapis.com” universe. Note that api_endpoint property still takes precedence; and universe_domain is currently not supported for mTLS.
client_info (google.api_core.gapic_v1.client_info.ClientInfo) – The client info used to send a user-agent string along with API requests. If None, then default info will be used. Generally, you only need to set this if you’re developing your own client library.

Raises

google.auth.exceptions.MutualTlsChannelError – If mutual TLS transport creation failed for any reason.

property api_endpoint¶

Return the API endpoint used by the client instance.

Returns: The API endpoint used by the client instance.
Return type: str

static common_billing_account_path(billing_account: str) → str¶: Returns a fully-qualified billing_account string.

static common_folder_path(folder: str) → str¶: Returns a fully-qualified folder string.

static common_location_path(project: str, location: str) → str¶: Returns a fully-qualified location string.

static common_organization_path(organization: str) → str¶: Returns a fully-qualified organization string.

static common_project_path(project: str) → str¶: Returns a fully-qualified project string.

async create_read_session(request: Optional[Union[google.cloud.bigquery_storage_v1.types.storage.CreateReadSessionRequest, dict]] = None, *, parent: Optional[str] = None, read_session: Optional[google.cloud.bigquery_storage_v1.types.stream.ReadSession] = None, max_stream_count: Optional[int] = None, retry: Optional[Union[google.api_core.retry.retry_unary_async.AsyncRetry, google.api_core.gapic_v1.method._MethodDefault]] = _MethodDefault._DEFAULT_VALUE, timeout: Union[float, object] = _MethodDefault._DEFAULT_VALUE, metadata: Sequence[Tuple[str, str]] = ()) → google.cloud.bigquery_storage_v1.types.stream.ReadSession[source]¶

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.

# This snippet 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 as shown in:
#   https://googleapis.dev/python/google-api-core/latest/client_options.html
from google.cloud import bigquery_storage_v1

async def sample_create_read_session():
    # Create a client
    client = bigquery_storage_v1.BigQueryReadAsyncClient()

    # Initialize request argument(s)
    request = bigquery_storage_v1.CreateReadSessionRequest(
        parent="parent_value",
    )

    # Make the request
    response = await client.create_read_session(request=request)

    # Handle the response
    print(response)

Parameters

request (Optional[Union[google.cloud.bigquery_storage_v1.types.CreateReadSessionRequest, dict]]) – The request object. Request message for CreateReadSession.
parent (str) –
Required. The request project that owns the session, in the form of projects/{project_id}.

This corresponds to the parent field on the request instance; if request is provided, this should not be set.
read_session (google.cloud.bigquery_storage_v1.types.ReadSession) – Required. Session to be created. This corresponds to the read_session field on the request instance; if request is provided, this should not be set.
max_stream_count (int) –
Max initial number of streams. If unset or zero, the server will provide a value of streams so as to produce reasonable throughput. Must be non-negative. The number of streams may be lower than the requested number, depending on the amount parallelism that is reasonable for the table. There is a default system max limit of 1,000.

This must be greater than or equal to preferred_min_stream_count. Typically, clients should either leave this unset to let the system to determine an upper bound OR set this a size for the maximum “units of work” it can gracefully handle.

This corresponds to the max_stream_count field on the request instance; if request is provided, this should not be set.
retry (google.api_core.retry_async.AsyncRetry) – Designation of what errors, if any, should be retried.
timeout (float) – The timeout for this request.
metadata (Sequence[Tuple[str, str]]) – Strings which should be sent along with the request as metadata.

Returns

Information about the ReadSession.

Return type

google.cloud.bigquery_storage_v1.types.ReadSession

classmethod from_service_account_file(filename: str, *args, **kwargs)[source]¶

Creates an instance of this client using the provided credentials: file.

Parameters

filename (str) – The path to the service account private key json file.
args – Additional arguments to pass to the constructor.
kwargs – Additional arguments to pass to the constructor.

Returns

The constructed client.

Return type

BigQueryReadAsyncClient

classmethod from_service_account_info(info: dict, *args, **kwargs)[source]¶

Creates an instance of this client using the provided credentials: info.

Parameters

info (dict) – The service account private key info.
args – Additional arguments to pass to the constructor.
kwargs – Additional arguments to pass to the constructor.

Returns

The constructed client.

Return type

BigQueryReadAsyncClient

classmethod from_service_account_json(filename: str, *args, **kwargs)¶

Creates an instance of this client using the provided credentials: file.

Parameters

filename (str) – The path to the service account private key json file.
args – Additional arguments to pass to the constructor.
kwargs – Additional arguments to pass to the constructor.

Returns

The constructed client.

Return type

BigQueryReadAsyncClient

classmethod get_mtls_endpoint_and_cert_source(client_options: Optional[google.api_core.client_options.ClientOptions] = None)[source]¶

Return the API endpoint and client cert source for mutual TLS.

The client cert source is determined in the following order: (1) if GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable is not “true”, the client cert source is None. (2) if client_options.client_cert_source is provided, use the provided one; if the default client cert source exists, use the default one; otherwise the client cert source is None.

The API endpoint is determined in the following order: (1) if client_options.api_endpoint if provided, use the provided one. (2) if GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable is “always”, use the default mTLS endpoint; if the environment variable is “never”, use the default API endpoint; otherwise if client cert source exists, use the default mTLS endpoint, otherwise use the default API endpoint.

More details can be found at https://google.aip.dev/auth/4114.

Parameters

client_options (google.api_core.client_options.ClientOptions) – Custom options for the client. Only the api_endpoint and client_cert_source properties may be used in this method.

Returns

returns the API endpoint and the: client cert source to use.

Return type

Tuple[str, Callable[[], Tuple[bytes, bytes]]]

Raises

google.auth.exceptions.MutualTLSChannelError – If any errors happen.

classmethod get_transport_class(label: Optional[str] = None) → Type[google.cloud.bigquery_storage_v1.services.big_query_read.transports.base.BigQueryReadTransport]¶

Returns an appropriate transport class.

Parameters: label – The name of the desired transport. If none is provided, then the first transport in the registry is used.
Returns: The transport class to use.

static parse_common_billing_account_path(path: str) → Dict[str, str]¶: Parse a billing_account path into its component segments.

static parse_common_folder_path(path: str) → Dict[str, str]¶: Parse a folder path into its component segments.

static parse_common_location_path(path: str) → Dict[str, str]¶: Parse a location path into its component segments.

static parse_common_organization_path(path: str) → Dict[str, str]¶: Parse a organization path into its component segments.

static parse_common_project_path(path: str) → Dict[str, str]¶: Parse a project path into its component segments.

static parse_read_session_path(path: str) → Dict[str, str]¶: Parses a read_session path into its component segments.

static parse_read_stream_path(path: str) → Dict[str, str]¶: Parses a read_stream path into its component segments.

static parse_table_path(path: str) → Dict[str, str]¶: Parses a table path into its component segments.

read_rows(request: Optional[Union[google.cloud.bigquery_storage_v1.types.storage.ReadRowsRequest, dict]] = None, *, read_stream: Optional[str] = None, offset: Optional[int] = None, retry: Optional[Union[google.api_core.retry.retry_unary_async.AsyncRetry, google.api_core.gapic_v1.method._MethodDefault]] = _MethodDefault._DEFAULT_VALUE, timeout: Union[float, object] = _MethodDefault._DEFAULT_VALUE, metadata: Sequence[Tuple[str, str]] = ()) → Awaitable[AsyncIterable[google.cloud.bigquery_storage_v1.types.storage.ReadRowsResponse]][source]¶

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.

# This snippet 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 as shown in:
#   https://googleapis.dev/python/google-api-core/latest/client_options.html
from google.cloud import bigquery_storage_v1

async def sample_read_rows():
    # Create a client
    client = bigquery_storage_v1.BigQueryReadAsyncClient()

    # Initialize request argument(s)
    request = bigquery_storage_v1.ReadRowsRequest(
        read_stream="read_stream_value",
    )

    # Make the request
    stream = await client.read_rows(request=request)

    # Handle the response
    async for response in stream:
        print(response)

Parameters

request (Optional[Union[google.cloud.bigquery_storage_v1.types.ReadRowsRequest, dict]]) – The request object. Request message for ReadRows.
read_stream (str) – Required. Stream to read rows from. This corresponds to the read_stream field on the request instance; if request is provided, this should not be set.
offset (int) –
The offset requested must be less than the last row read from Read. Requesting a larger offset is undefined. If not specified, start reading from offset zero.

This corresponds to the offset field on the request instance; if request is provided, this should not be set.
retry (google.api_core.retry_async.AsyncRetry) – Designation of what errors, if any, should be retried.
timeout (float) – The timeout for this request.
metadata (Sequence[Tuple[str, str]]) – Strings which should be sent along with the request as metadata.

Returns

Response from calling ReadRows may include row data, progress and: throttling information.

Return type

AsyncIterable[google.cloud.bigquery_storage_v1.types.ReadRowsResponse]

static read_session_path(project: str, location: str, session: str) → str¶: Returns a fully-qualified read_session string.

static read_stream_path(project: str, location: str, session: str, stream: str) → str¶: Returns a fully-qualified read_stream string.

async split_read_stream(request: Optional[Union[google.cloud.bigquery_storage_v1.types.storage.SplitReadStreamRequest, dict]] = None, *, retry: Optional[Union[google.api_core.retry.retry_unary_async.AsyncRetry, google.api_core.gapic_v1.method._MethodDefault]] = _MethodDefault._DEFAULT_VALUE, timeout: Union[float, object] = _MethodDefault._DEFAULT_VALUE, metadata: Sequence[Tuple[str, str]] = ()) → google.cloud.bigquery_storage_v1.types.storage.SplitReadStreamResponse[source]¶

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.

# This snippet 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 as shown in:
#   https://googleapis.dev/python/google-api-core/latest/client_options.html
from google.cloud import bigquery_storage_v1

async def sample_split_read_stream():
    # Create a client
    client = bigquery_storage_v1.BigQueryReadAsyncClient()

    # Initialize request argument(s)
    request = bigquery_storage_v1.SplitReadStreamRequest(
        name="name_value",
    )

    # Make the request
    response = await client.split_read_stream(request=request)

    # Handle the response
    print(response)

Parameters

request (Optional[Union[google.cloud.bigquery_storage_v1.types.SplitReadStreamRequest, dict]]) – The request object. Request message for SplitReadStream.
retry (google.api_core.retry_async.AsyncRetry) – Designation of what errors, if any, should be retried.
timeout (float) – The timeout for this request.
metadata (Sequence[Tuple[str, str]]) – Strings which should be sent along with the request as metadata.

Returns

Response message for SplitReadStream.

Return type

google.cloud.bigquery_storage_v1.types.SplitReadStreamResponse

static table_path(project: str, dataset: str, table: str) → str¶: Returns a fully-qualified table string.

property transport: google.cloud.bigquery_storage_v1.services.big_query_read.transports.base.BigQueryReadTransport¶

Returns the transport used by the client instance.

Returns: The transport used by the client instance.
Return type: BigQueryReadTransport

property universe_domain: str¶

Return the universe domain used by the client instance.

Returns

The universe domain used: by the client instance.

Return type

str

class google.cloud.bigquery_storage_v1.services.big_query_read.BigQueryReadClient(*, credentials: typing.Optional[google.auth.credentials.Credentials] = None, transport: typing.Optional[typing.Union[str, google.cloud.bigquery_storage_v1.services.big_query_read.transports.base.BigQueryReadTransport, typing.Callable[[...], google.cloud.bigquery_storage_v1.services.big_query_read.transports.base.BigQueryReadTransport]]] = None, client_options: typing.Optional[typing.Union[google.api_core.client_options.ClientOptions, dict]] = None, client_info: google.api_core.gapic_v1.client_info.ClientInfo = <google.api_core.gapic_v1.client_info.ClientInfo object>)[source]¶

BigQuery Read API.

The Read API can be used to read data from BigQuery.

Instantiates the big query read client.

Parameters

credentials (Optional[google.auth.credentials.Credentials]) – The authorization credentials to attach to requests. These credentials identify the application to the service; if none are specified, the client will attempt to ascertain the credentials from the environment.
transport (Optional[Union[str,BigQueryReadTransport,Callable[..., BigQueryReadTransport]]]) – The transport to use, or a Callable that constructs and returns a new transport. If a Callable is given, it will be called with the same set of initialization arguments as used in the BigQueryReadTransport constructor. If set to None, a transport is chosen automatically.
client_options (Optional[Union[google.api_core.client_options.ClientOptions, dict]]) –
Custom options for the client.

1. The api_endpoint property can be used to override the default endpoint provided by the client when transport is not explicitly provided. Only if this property is not set and transport was not explicitly provided, the endpoint is determined by the GOOGLE_API_USE_MTLS_ENDPOINT environment variable, which have one of the following values: “always” (always use the default mTLS endpoint), “never” (always use the default regular endpoint) and “auto” (auto-switch to the default mTLS endpoint if client certificate is present; this is the default value).

2. If the GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable is “true”, then the client_cert_source property can be used to provide a client certificate for mTLS transport. If not provided, the default SSL client certificate will be used if present. If GOOGLE_API_USE_CLIENT_CERTIFICATE is “false” or not set, no client certificate will be used.

3. The universe_domain property can be used to override the default “googleapis.com” universe. Note that the api_endpoint property still takes precedence; and universe_domain is currently not supported for mTLS.
client_info (google.api_core.gapic_v1.client_info.ClientInfo) – The client info used to send a user-agent string along with API requests. If None, then default info will be used. Generally, you only need to set this if you’re developing your own client library.

Raises

google.auth.exceptions.MutualTLSChannelError – If mutual TLS transport creation failed for any reason.

__exit__(type, value, traceback)[source]¶: Releases underlying transport’s resources.

Warning

ONLY use as a context manager if the transport is NOT shared with other clients! Exiting the with block will CLOSE the transport and may cause errors in other clients!

property api_endpoint¶

Return the API endpoint used by the client instance.

Returns: The API endpoint used by the client instance.
Return type: str

static common_billing_account_path(billing_account: str) → str[source]¶: Returns a fully-qualified billing_account string.

static common_folder_path(folder: str) → str[source]¶: Returns a fully-qualified folder string.

static common_location_path(project: str, location: str) → str[source]¶: Returns a fully-qualified location string.

static common_organization_path(organization: str) → str[source]¶: Returns a fully-qualified organization string.

static common_project_path(project: str) → str[source]¶: Returns a fully-qualified project string.

create_read_session(request: Optional[Union[google.cloud.bigquery_storage_v1.types.storage.CreateReadSessionRequest, dict]] = None, *, parent: Optional[str] = None, read_session: Optional[google.cloud.bigquery_storage_v1.types.stream.ReadSession] = None, max_stream_count: Optional[int] = None, retry: Optional[Union[google.api_core.retry.retry_unary.Retry, google.api_core.gapic_v1.method._MethodDefault]] = _MethodDefault._DEFAULT_VALUE, timeout: Union[float, object] = _MethodDefault._DEFAULT_VALUE, metadata: Sequence[Tuple[str, str]] = ()) → google.cloud.bigquery_storage_v1.types.stream.ReadSession[source]¶

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.

# This snippet 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 as shown in:
#   https://googleapis.dev/python/google-api-core/latest/client_options.html
from google.cloud import bigquery_storage_v1

def sample_create_read_session():
    # Create a client
    client = bigquery_storage_v1.BigQueryReadClient()

    # Initialize request argument(s)
    request = bigquery_storage_v1.CreateReadSessionRequest(
        parent="parent_value",
    )

    # Make the request
    response = client.create_read_session(request=request)

    # Handle the response
    print(response)

Parameters

request (Union[google.cloud.bigquery_storage_v1.types.CreateReadSessionRequest, dict]) – The request object. Request message for CreateReadSession.
parent (str) –
Required. The request project that owns the session, in the form of projects/{project_id}.

This corresponds to the parent field on the request instance; if request is provided, this should not be set.
read_session (google.cloud.bigquery_storage_v1.types.ReadSession) – Required. Session to be created. This corresponds to the read_session field on the request instance; if request is provided, this should not be set.
max_stream_count (int) –
Max initial number of streams. If unset or zero, the server will provide a value of streams so as to produce reasonable throughput. Must be non-negative. The number of streams may be lower than the requested number, depending on the amount parallelism that is reasonable for the table. There is a default system max limit of 1,000.

This must be greater than or equal to preferred_min_stream_count. Typically, clients should either leave this unset to let the system to determine an upper bound OR set this a size for the maximum “units of work” it can gracefully handle.

This corresponds to the max_stream_count field on the request instance; if request is provided, this should not be set.
retry (google.api_core.retry.Retry) – Designation of what errors, if any, should be retried.
timeout (float) – The timeout for this request.
metadata (Sequence[Tuple[str, str]]) – Strings which should be sent along with the request as metadata.

Returns

Information about the ReadSession.

Return type

google.cloud.bigquery_storage_v1.types.ReadSession

classmethod from_service_account_file(filename: str, *args, **kwargs)[source]¶

Creates an instance of this client using the provided credentials: file.

Parameters

filename (str) – The path to the service account private key json file.
args – Additional arguments to pass to the constructor.
kwargs – Additional arguments to pass to the constructor.

Returns

The constructed client.

Return type

BigQueryReadClient

classmethod from_service_account_info(info: dict, *args, **kwargs)[source]¶

Creates an instance of this client using the provided credentials: info.

Parameters

info (dict) – The service account private key info.
args – Additional arguments to pass to the constructor.
kwargs – Additional arguments to pass to the constructor.

Returns

The constructed client.

Return type

BigQueryReadClient

classmethod from_service_account_json(filename: str, *args, **kwargs)¶

Creates an instance of this client using the provided credentials: file.

Parameters

filename (str) – The path to the service account private key json file.
args – Additional arguments to pass to the constructor.
kwargs – Additional arguments to pass to the constructor.

Returns

The constructed client.

Return type

BigQueryReadClient

classmethod get_mtls_endpoint_and_cert_source(client_options: Optional[google.api_core.client_options.ClientOptions] = None)[source]¶

Deprecated. Return the API endpoint and client cert source for mutual TLS.

The client cert source is determined in the following order: (1) if GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable is not “true”, the client cert source is None. (2) if client_options.client_cert_source is provided, use the provided one; if the default client cert source exists, use the default one; otherwise the client cert source is None.

The API endpoint is determined in the following order: (1) if client_options.api_endpoint if provided, use the provided one. (2) if GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable is “always”, use the default mTLS endpoint; if the environment variable is “never”, use the default API endpoint; otherwise if client cert source exists, use the default mTLS endpoint, otherwise use the default API endpoint.

More details can be found at https://google.aip.dev/auth/4114.

Parameters

client_options (google.api_core.client_options.ClientOptions) – Custom options for the client. Only the api_endpoint and client_cert_source properties may be used in this method.

Returns

returns the API endpoint and the: client cert source to use.

Return type

Tuple[str, Callable[[], Tuple[bytes, bytes]]]

Raises

google.auth.exceptions.MutualTLSChannelError – If any errors happen.

static parse_common_billing_account_path(path: str) → Dict[str, str][source]¶: Parse a billing_account path into its component segments.

static parse_common_folder_path(path: str) → Dict[str, str][source]¶: Parse a folder path into its component segments.

static parse_common_location_path(path: str) → Dict[str, str][source]¶: Parse a location path into its component segments.

static parse_common_organization_path(path: str) → Dict[str, str][source]¶: Parse a organization path into its component segments.

static parse_common_project_path(path: str) → Dict[str, str][source]¶: Parse a project path into its component segments.

static parse_read_session_path(path: str) → Dict[str, str][source]¶: Parses a read_session path into its component segments.

static parse_read_stream_path(path: str) → Dict[str, str][source]¶: Parses a read_stream path into its component segments.

static parse_table_path(path: str) → Dict[str, str][source]¶: Parses a table path into its component segments.

read_rows(request: Optional[Union[google.cloud.bigquery_storage_v1.types.storage.ReadRowsRequest, dict]] = None, *, read_stream: Optional[str] = None, offset: Optional[int] = None, retry: Optional[Union[google.api_core.retry.retry_unary.Retry, google.api_core.gapic_v1.method._MethodDefault]] = _MethodDefault._DEFAULT_VALUE, timeout: Union[float, object] = _MethodDefault._DEFAULT_VALUE, metadata: Sequence[Tuple[str, str]] = ()) → Iterable[google.cloud.bigquery_storage_v1.types.storage.ReadRowsResponse][source]¶

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.

# This snippet 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 as shown in:
#   https://googleapis.dev/python/google-api-core/latest/client_options.html
from google.cloud import bigquery_storage_v1

def sample_read_rows():
    # Create a client
    client = bigquery_storage_v1.BigQueryReadClient()

    # Initialize request argument(s)
    request = bigquery_storage_v1.ReadRowsRequest(
        read_stream="read_stream_value",
    )

    # Make the request
    stream = client.read_rows(request=request)

    # Handle the response
    for response in stream:
        print(response)

Parameters

request (Union[google.cloud.bigquery_storage_v1.types.ReadRowsRequest, dict]) – The request object. Request message for ReadRows.
read_stream (str) – Required. Stream to read rows from. This corresponds to the read_stream field on the request instance; if request is provided, this should not be set.
offset (int) –
The offset requested must be less than the last row read from Read. Requesting a larger offset is undefined. If not specified, start reading from offset zero.

This corresponds to the offset field on the request instance; if request is provided, this should not be set.
retry (google.api_core.retry.Retry) – Designation of what errors, if any, should be retried.
timeout (float) – The timeout for this request.
metadata (Sequence[Tuple[str, str]]) – Strings which should be sent along with the request as metadata.

Returns

Response from calling ReadRows may include row data, progress and: throttling information.

Return type

Iterable[google.cloud.bigquery_storage_v1.types.ReadRowsResponse]

static read_session_path(project: str, location: str, session: str) → str[source]¶: Returns a fully-qualified read_session string.

static read_stream_path(project: str, location: str, session: str, stream: str) → str[source]¶: Returns a fully-qualified read_stream string.

split_read_stream(request: Optional[Union[google.cloud.bigquery_storage_v1.types.storage.SplitReadStreamRequest, dict]] = None, *, retry: Optional[Union[google.api_core.retry.retry_unary.Retry, google.api_core.gapic_v1.method._MethodDefault]] = _MethodDefault._DEFAULT_VALUE, timeout: Union[float, object] = _MethodDefault._DEFAULT_VALUE, metadata: Sequence[Tuple[str, str]] = ()) → google.cloud.bigquery_storage_v1.types.storage.SplitReadStreamResponse[source]¶

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.

# This snippet 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 as shown in:
#   https://googleapis.dev/python/google-api-core/latest/client_options.html
from google.cloud import bigquery_storage_v1

def sample_split_read_stream():
    # Create a client
    client = bigquery_storage_v1.BigQueryReadClient()

    # Initialize request argument(s)
    request = bigquery_storage_v1.SplitReadStreamRequest(
        name="name_value",
    )

    # Make the request
    response = client.split_read_stream(request=request)

    # Handle the response
    print(response)

Parameters

request (Union[google.cloud.bigquery_storage_v1.types.SplitReadStreamRequest, dict]) – The request object. Request message for SplitReadStream.
retry (google.api_core.retry.Retry) – Designation of what errors, if any, should be retried.
timeout (float) – The timeout for this request.
metadata (Sequence[Tuple[str, str]]) – Strings which should be sent along with the request as metadata.

Returns

Response message for SplitReadStream.

Return type

google.cloud.bigquery_storage_v1.types.SplitReadStreamResponse

static table_path(project: str, dataset: str, table: str) → str[source]¶: Returns a fully-qualified table string.

property transport: google.cloud.bigquery_storage_v1.services.big_query_read.transports.base.BigQueryReadTransport¶

Returns the transport used by the client instance.

Returns

The transport used by the client: instance.

Return type

BigQueryReadTransport

property universe_domain: str¶

Return the universe domain used by the client instance.

Returns: The universe domain used by the client instance.
Return type: str

BigQueryRead¶

google-cloud-bigquery-storage

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