Create a BigQuery subscription

Create a BigQuery subscription where messages published to a topic populates a BigQuery table.

Explore further

For detailed documentation that includes this code sample, see the following:

• Create BigQuery subscriptions

Code sample

C++

Before trying this sample, follow the C++ setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub C++ API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

namespace pubsub = ::google::cloud::pubsub;
namespace pubsub_admin = ::google::cloud::pubsub_admin;
[](pubsub_admin::SubscriptionAdminClient client,
   std::string const& project_id, std::string const& topic_id,
   std::string const& subscription_id, std::string const& table_id) {
  google::pubsub::v1::Subscription request;
  request.set_name(
      pubsub::Subscription(project_id, subscription_id).FullName());
  request.set_topic(pubsub::Topic(project_id, topic_id).FullName());
  request.mutable_bigquery_config()->set_table(table_id);
  auto sub = client.CreateSubscription(request);
  if (!sub) {
    if (sub.status().code() == google::cloud::StatusCode::kAlreadyExists) {
      std::cout << "The subscription already exists\n";
      return;
    }
    throw std::move(sub).status();
  }

  std::cout << "The subscription was successfully created: "
            << sub->DebugString() << "\n";
}

C#

Before trying this sample, follow the C# setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub C# API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

using Google.Cloud.PubSub.V1;

public class CreateBigQuerySubscriptionSample
{
    public Subscription CreateBigQuerySubscription(string projectId, string topicId, string subscriptionId, string bigqueryTableId)
    {
        SubscriberServiceApiClient subscriber = SubscriberServiceApiClient.Create();
        TopicName topicName = TopicName.FromProjectTopic(projectId, topicId);
        SubscriptionName subscriptionName = SubscriptionName.FromProjectSubscription(projectId, subscriptionId);

        var subscriptionRequest = new Subscription
        {
            SubscriptionName = subscriptionName,
            TopicAsTopicName = topicName,
            BigqueryConfig = new BigQueryConfig
            {
                Table = bigqueryTableId
            }
        };
        var subscription = subscriber.CreateSubscription(subscriptionRequest);
        return subscription;
    }
}

Go

Before trying this sample, follow the Go setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub Go API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/pubsub"
)

// createBigQuerySubscription creates a Pub/Sub subscription that exports messages to BigQuery.
func createBigQuerySubscription(w io.Writer, projectID, subID string, topic *pubsub.Topic, table string) error {
	// projectID := "my-project-id"
	// subID := "my-sub"
	// topic of type https://godoc.org/cloud.google.com/go/pubsub#Topic
	// table := "my-project-id.dataset_id.table_id"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	sub, err := client.CreateSubscription(ctx, subID, pubsub.SubscriptionConfig{
		Topic: topic,
		BigQueryConfig: pubsub.BigQueryConfig{
			Table:         table,
			WriteMetadata: true,
		},
	})
	if err != nil {
		return fmt.Errorf("client.CreateSubscription: %w", err)
	}
	fmt.Fprintf(w, "Created BigQuery subscription: %v\n", sub)

	return nil
}

Java

Before trying this sample, follow the Java setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub Java API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
import com.google.pubsub.v1.BigQueryConfig;
import com.google.pubsub.v1.ProjectSubscriptionName;
import com.google.pubsub.v1.ProjectTopicName;
import com.google.pubsub.v1.Subscription;
import java.io.IOException;

public class CreateBigQuerySubscriptionExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String topicId = "your-topic-id";
    String subscriptionId = "your-subscription-id";
    String bigqueryTableId = "your-project.your-dataset.your-table";

    createBigQuerySubscription(projectId, topicId, subscriptionId, bigqueryTableId);
  }

  public static void createBigQuerySubscription(
      String projectId, String topicId, String subscriptionId, String bigqueryTableId)
      throws IOException {
    try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {

      ProjectTopicName topicName = ProjectTopicName.of(projectId, topicId);
      ProjectSubscriptionName subscriptionName =
          ProjectSubscriptionName.of(projectId, subscriptionId);

      BigQueryConfig bigqueryConfig =
          BigQueryConfig.newBuilder().setTable(bigqueryTableId).setWriteMetadata(true).build();

      Subscription subscription =
          subscriptionAdminClient.createSubscription(
              Subscription.newBuilder()
                  .setName(subscriptionName.toString())
                  .setTopic(topicName.toString())
                  .setBigqueryConfig(bigqueryConfig)
                  .build());

      System.out.println("Created a BigQuery subscription: " + subscription.getAllFields());
    }
  }
}

Node.js

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';
// const bigqueryTableId = 'YOUR_TABLE_ID';

// Imports the Google Cloud client library
const {PubSub} = require('@google-cloud/pubsub');

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function createBigQuerySubscription(
  topicNameOrId,
  subscriptionNameOrId,
  bigqueryTableId
) {
  const options = {
    bigqueryConfig: {
      table: bigqueryTableId,
      writeMetadata: true,
    },
  };

  await pubSubClient
    .topic(topicNameOrId)
    .createSubscription(subscriptionNameOrId, options);

  console.log(`Subscription ${subscriptionNameOrId} created.`);
}

Node.js

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';
// const bigqueryTableId = 'YOUR_TABLE_ID';

// Imports the Google Cloud client library
import {PubSub, CreateSubscriptionOptions} from '@google-cloud/pubsub';

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function createBigQuerySubscription(
  topicNameOrId: string,
  subscriptionNameOrId: string,
  bigqueryTableId: string
) {
  const options: CreateSubscriptionOptions = {
    bigqueryConfig: {
      table: bigqueryTableId,
      writeMetadata: true,
    },
  };

  await pubSubClient
    .topic(topicNameOrId)
    .createSubscription(subscriptionNameOrId, options);

  console.log(`Subscription ${subscriptionNameOrId} created.`);
}

PHP

Before trying this sample, follow the PHP setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub PHP API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

use Google\Cloud\PubSub\PubSubClient;
use Google\Cloud\PubSub\V1\BigQueryConfig;

/**
 * Creates a Pub/Sub BigQuery subscription.
 *
 * @param string $projectId  The Google project ID.
 * @param string $topicName  The Pub/Sub topic name.
 * @param string $subscriptionName  The Pub/Sub subscription name.
 * @param string $table      The BigQuery table to which to write.
 */
function create_bigquery_subscription($projectId, $topicName, $subscriptionName, $table)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    $topic = $pubsub->topic($topicName);
    $subscription = $topic->subscription($subscriptionName);
    $config = new BigQueryConfig(['table' => $table]);
    $subscription->create([
        'bigqueryConfig' => $config
    ]);

    printf('Subscription created: %s' . PHP_EOL, $subscription->name());
}

Python

Before trying this sample, follow the Python setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub Python API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

from google.cloud import pubsub_v1

# TODO(developer)
# project_id = "your-project-id"
# topic_id = "your-topic-id"
# subscription_id = "your-subscription-id"
# bigquery_table_id = "your-project.your-dataset.your-table"

publisher = pubsub_v1.PublisherClient()
subscriber = pubsub_v1.SubscriberClient()
topic_path = publisher.topic_path(project_id, topic_id)
subscription_path = subscriber.subscription_path(project_id, subscription_id)

bigquery_config = pubsub_v1.types.BigQueryConfig(
    table=bigquery_table_id, write_metadata=True
)

# Wrap the subscriber in a 'with' block to automatically call close() to
# close the underlying gRPC channel when done.
with subscriber:
    subscription = subscriber.create_subscription(
        request={
            "name": subscription_path,
            "topic": topic_path,
            "bigquery_config": bigquery_config,
        }
    )

print(f"BigQuery subscription created: {subscription}.")
print(f"Table for subscription is: {bigquery_table_id}")

Ruby

Before trying this sample, follow the Ruby setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub Ruby API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

require "google/cloud/pubsub"

##
# Shows how to create a BigQuery subscription where messages published
# to a topic populates a BigQuery table.
#
# @param project_id [String]
# Your Google Cloud project (e.g. "my-project")
# @param topic_id [String]
# Your topic name (e.g. "my-secret")
# @param subscription_id [String]
# ID for new subscription to be created (e.g. "my-subscription")
# @param bigquery_table_id [String]
# ID of bigquery table (e.g "my-project:dataset-id.table-id")
#
def pubsub_create_bigquery_subscription project_id:, topic_id:, subscription_id:, bigquery_table_id:
  pubsub = Google::Cloud::Pubsub.new project_id: project_id
  topic = pubsub.topic topic_id
  subscription = topic.subscribe subscription_id,
                                 bigquery_config: {
                                   table: bigquery_table_id,
                                   write_metadata: true
                                 }
  puts "BigQuery subscription created: #{subscription_id}."
  puts "Table for subscription is: #{bigquery_table_id}"
end

What's next

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