BigQueryReadClient

BigQuery Read API.

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

Constructor

new BigQueryReadClient(optionsopt, gaxInstanceopt)

Construct an instance of BigQueryReadClient.

Parameters:

Name Type Attributes Description

options

object

The configuration object. The options accepted by the constructor are described in detail in this document. The common options are:

Properties

Name Type Attributes Description

credentials

object

Credentials object.

Properties

Name	Type	Attributes	Description
`client_email`	string	<optional>
`private_key`	string	<optional>

email

string

Account email address. Required when using a .pem or .p12 keyFilename.

keyFilename

string

Full path to the a .json, .pem, or .p12 key downloaded from the Google Developers Console. If you provide a path to a JSON file, the projectId option below is not necessary. NOTE: .pem and .p12 require you to specify options.email as well.

port

number

The port on which to connect to the remote host.

projectId

string

The project ID from the Google Developer's Console, e.g. 'grape-spaceship-123'. We will also check the environment variable GCLOUD_PROJECT for your project ID. If your app is running in an environment which supports Application Default Credentials, your project ID will be detected automatically.

apiEndpoint

string

The domain name of the API remote host.

clientConfig

gax.ClientConfig

Client configuration override. Follows the structure of gapicConfig.

fallback

boolean

Use HTTP/1.1 REST mode. For more information, please check the documentation.

gaxInstance

gax

loaded instance of google-gax. Useful if you need to avoid loading the default gRPC version and want to use the fallback HTTP implementation. Load only fallback version and pass it to the constructor: const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC const client = new BigQueryReadClient({fallback: true}, gax);

Members

apiEndpoint

The DNS address for this API service.

apiEndpoint

The DNS address for this API service - same as servicePath.

port

The port for this API service.

scopes

The scopes needed to make gRPC calls for every method defined in this service.

servicePath

The DNS address for this API service.

Methods

close() → {Promise}

Terminate the gRPC channel and close the client.

The client will no longer be usable and all future behavior is undefined.

Returns:

Type	Description
Promise	A promise that resolves when the client is closed.

getProjectId() → {Promise}

Return the project ID used by this class.

Returns:

Type	Description
Promise	A promise that resolves to string containing the project ID.

initialize() → {Promise}

Initialize the client. Performs asynchronous operations (such as authentication) and prepares the client. This function will be called automatically when any class method is called for the first time, but if you need to initialize it before calling an actual method, feel free to call initialize() directly.

You can await on this method if you want to make sure the client is initialized.

Returns:

Type	Description
Promise	A promise that resolves to an authenticated service stub.

matchDatasetFromTableName(tableName) → {string}

Parse the dataset from Table resource.

Parameters:

Name	Type	Description
`tableName`	string	A fully-qualified path representing Table resource.

Returns:

Type	Description
string	A string representing the dataset.

matchDatasetFromWriteStreamName(writeStreamName) → {string}

Parse the dataset from WriteStream resource.

Parameters:

Name	Type	Description
`writeStreamName`	string	A fully-qualified path representing WriteStream resource.

Returns:

Type	Description
string	A string representing the dataset.

matchLocationFromReadSessionName(readSessionName) → {string}

Parse the location from ReadSession resource.

Parameters:

Name	Type	Description
`readSessionName`	string	A fully-qualified path representing ReadSession resource.

Returns:

Type	Description
string	A string representing the location.

matchLocationFromReadStreamName(readStreamName) → {string}

Parse the location from ReadStream resource.

Parameters:

Name	Type	Description
`readStreamName`	string	A fully-qualified path representing ReadStream resource.

Returns:

Type	Description
string	A string representing the location.

matchProjectFromProjectName(projectName) → {string}

Parse the project from Project resource.

Parameters:

Name	Type	Description
`projectName`	string	A fully-qualified path representing Project resource.

Returns:

Type	Description
string	A string representing the project.

matchProjectFromReadSessionName(readSessionName) → {string}

Parse the project from ReadSession resource.

Parameters:

Name	Type	Description
`readSessionName`	string	A fully-qualified path representing ReadSession resource.

Returns:

Type	Description
string	A string representing the project.

matchProjectFromReadStreamName(readStreamName) → {string}

Parse the project from ReadStream resource.

Parameters:

Name	Type	Description
`readStreamName`	string	A fully-qualified path representing ReadStream resource.

Returns:

Type	Description
string	A string representing the project.

matchProjectFromTableName(tableName) → {string}

Parse the project from Table resource.

Parameters:

Name	Type	Description
`tableName`	string	A fully-qualified path representing Table resource.

Returns:

Type	Description
string	A string representing the project.

matchProjectFromWriteStreamName(writeStreamName) → {string}

Parse the project from WriteStream resource.

Parameters:

Name	Type	Description
`writeStreamName`	string	A fully-qualified path representing WriteStream resource.

Returns:

Type	Description
string	A string representing the project.

matchSessionFromReadSessionName(readSessionName) → {string}

Parse the session from ReadSession resource.

Parameters:

Name	Type	Description
`readSessionName`	string	A fully-qualified path representing ReadSession resource.

Returns:

Type	Description
string	A string representing the session.

matchSessionFromReadStreamName(readStreamName) → {string}

Parse the session from ReadStream resource.

Parameters:

Name	Type	Description
`readStreamName`	string	A fully-qualified path representing ReadStream resource.

Returns:

Type	Description
string	A string representing the session.

matchStreamFromReadStreamName(readStreamName) → {string}

Parse the stream from ReadStream resource.

Parameters:

Name	Type	Description
`readStreamName`	string	A fully-qualified path representing ReadStream resource.

Returns:

Type	Description
string	A string representing the stream.

matchStreamFromWriteStreamName(writeStreamName) → {string}

Parse the stream from WriteStream resource.

Parameters:

Name	Type	Description
`writeStreamName`	string	A fully-qualified path representing WriteStream resource.

Returns:

Type	Description
string	A string representing the stream.

matchTableFromTableName(tableName) → {string}

Parse the table from Table resource.

Parameters:

Name	Type	Description
`tableName`	string	A fully-qualified path representing Table resource.

Returns:

Type	Description
string	A string representing the table.

matchTableFromWriteStreamName(writeStreamName) → {string}

Parse the table from WriteStream resource.

Parameters:

Name	Type	Description
`writeStreamName`	string	A fully-qualified path representing WriteStream resource.

Returns:

Type	Description
string	A string representing the table.

projectPath(project) → {string}

Return a fully-qualified project resource name string.

Parameters:

Name	Type	Description
`project`	string

Returns:

Type	Description
string	Resource name string.

readRows(request, optionsopt) → {Stream}

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 Type Attributes Description

request

Object

The request object that will be sent.

Properties

Name	Type	Description
`readStream`	string	Required. Stream to read rows from.
`offset`	number	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.

options

object

Call options. See CallOptions for more details.

Returns:

Type	Description
Stream	An object stream which emits ReadRowsResponse on 'data' event. Please see the documentation for more details and examples.

Example

  /**
   * 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.
   * TODO(developer): Uncomment these variables before running the sample.
   */
  /**
   *  Required. Stream to read rows from.
   */
  // const readStream = 'abc123'
  /**
   *  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.
   */
  // const offset = 1234

  // Imports the Storage library
  const {BigQueryReadClient} = require('@google-cloud/bigquery-storage').v1;

  // Instantiates a client
  const storageClient = new BigQueryReadClient();

  async function callReadRows() {
    // Construct request
    const request = {
      readStream,
    };

    // Run request
    const stream = await storageClient.readRows(request);
    stream.on('data', (response) => { console.log(response) });
    stream.on('error', (err) => { throw(err) });
    stream.on('end', () => { /* API call completed */ });
  }

  callReadRows();

readSessionPath(project, location, session) → {string}

Return a fully-qualified readSession resource name string.

Parameters:

Name	Type	Description
`project`	string
`location`	string
`session`	string

Returns:

Type	Description
string	Resource name string.

readStreamPath(project, location, session, stream) → {string}

Return a fully-qualified readStream resource name string.

Parameters:

Name	Type	Description
`project`	string
`location`	string
`session`	string
`stream`	string

Returns:

Type	Description
string	Resource name string.

tablePath(project, dataset, table) → {string}

Return a fully-qualified table resource name string.

Parameters:

Name	Type	Description
`project`	string
`dataset`	string
`table`	string

Returns:

Type	Description
string	Resource name string.

writeStreamPath(project, dataset, table, stream) → {string}

Return a fully-qualified writeStream resource name string.

Parameters:

Name	Type	Description
`project`	string
`dataset`	string
`table`	string
`stream`	string

Returns:

Type	Description
string	Resource name string.