Exécuter une requête par lot en priorité

Exécutez une tâche de requête par lot.

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Pour obtenir une documentation détaillée incluant cet exemple de code, consultez les articles suivants :

Exécuter une requête

Exemple de code

Go

Avant d'essayer cet exemple, suivez les instructions de configuration pour Go du guide de démarrage rapide de BigQuery : Utiliser les bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API BigQuery pour Go.

Pour vous authentifier auprès de BigQuery, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez la page Configurer l'authentification pour les bibliothèques clientes.

import (
	"context"
	"fmt"
	"io"
	"time"

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

// queryBatch demonstrates issuing a query job using batch priority.
func queryBatch(w io.Writer, projectID, dstDatasetID, dstTableID string) error {
	// projectID := "my-project-id"
	// dstDatasetID := "mydataset"
	// dstTableID := "mytable"
	ctx := context.Background()
	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %w", err)
	}
	defer client.Close()

	// Build an aggregate table.
	q := client.Query(`
		SELECT
  			corpus,
  			SUM(word_count) as total_words,
  			COUNT(1) as unique_words
		FROM ` + "`bigquery-public-data.samples.shakespeare`" + `
		GROUP BY corpus;`)
	q.Priority = bigquery.BatchPriority
	q.QueryConfig.Dst = client.Dataset(dstDatasetID).Table(dstTableID)

	// Start the job.
	job, err := q.Run(ctx)
	if err != nil {
		return err
	}
	// Job is started and will progress without interaction.
	// To simulate other work being done, sleep a few seconds.
	time.Sleep(5 * time.Second)
	status, err := job.Status(ctx)
	if err != nil {
		return err
	}

	state := "Unknown"
	switch status.State {
	case bigquery.Pending:
		state = "Pending"
	case bigquery.Running:
		state = "Running"
	case bigquery.Done:
		state = "Done"
	}
	// You can continue to monitor job progress until it reaches
	// the Done state by polling periodically.  In this example,
	// we print the latest status.
	fmt.Fprintf(w, "Job %s in Location %s currently in state: %s\n", job.ID(), job.Location(), state)

	return nil

}

Java

Avant d'essayer cet exemple, suivez les instructions de configuration pour Java du guide de démarrage rapide de BigQuery : Utiliser les bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API BigQuery pour Java.

import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.QueryJobConfiguration;
import com.google.cloud.bigquery.TableResult;

// Sample to query batch in a table
public class QueryBatch {

  public static void main(String[] args) {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "MY_PROJECT_ID";
    String datasetName = "MY_DATASET_NAME";
    String tableName = "MY_TABLE_NAME";
    String query =
        "SELECT corpus"
            + " FROM `"
            + projectId
            + "."
            + datasetName
            + "."
            + tableName
            + " GROUP BY corpus;";
    queryBatch(query);
  }

  public static void queryBatch(String query) {
    try {
      // Initialize client that will be used to send requests. This client only needs to be created
      // once, and can be reused for multiple requests.
      BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();

      QueryJobConfiguration queryConfig =
          QueryJobConfiguration.newBuilder(query)
              // Run at batch priority, which won't count toward concurrent rate limit.
              .setPriority(QueryJobConfiguration.Priority.BATCH)
              .build();

      TableResult results = bigquery.query(queryConfig);

      results
          .iterateAll()
          .forEach(row -> row.forEach(val -> System.out.printf("%s,", val.toString())));

      System.out.println("Query batch performed successfully.");
    } catch (BigQueryException | InterruptedException e) {
      System.out.println("Query batch not performed \n" + e.toString());
    }
  }
}

Node.js

Avant d'essayer cet exemple, suivez les instructions de configuration pour Node.js du guide de démarrage rapide de BigQuery : Utiliser les bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API BigQuery pour Node.js.

// Import the Google Cloud client library and create a client
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();

async function queryBatch() {
  // Runs a query at batch priority.

  // Create query job configuration. For all options, see
  // https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#jobconfigurationquery
  const queryJobConfig = {
    query: `SELECT corpus
            FROM \`bigquery-public-data.samples.shakespeare\`
            LIMIT 10`,
    useLegacySql: false,
    priority: 'BATCH',
  };

  // Create job configuration. For all options, see
  // https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#jobconfiguration
  const jobConfig = {
    // Specify a job configuration to set optional job resource properties.
    configuration: {
      query: queryJobConfig,
    },
  };

  // Make API request.
  const [job] = await bigquery.createJob(jobConfig);

  const jobId = job.metadata.id;
  const state = job.metadata.status.state;
  console.log(`Job ${jobId} is currently in state ${state}`);
}

Python

Avant d'essayer cet exemple, suivez les instructions de configuration pour Python du guide de démarrage rapide de BigQuery : Utiliser les bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API BigQuery pour Python.

from google.cloud import bigquery

# Construct a BigQuery client object.
client = bigquery.Client()

job_config = bigquery.QueryJobConfig(
    # Run at batch priority, which won't count toward concurrent rate limit.
    priority=bigquery.QueryPriority.BATCH
)

sql = """
    SELECT corpus
    FROM `bigquery-public-data.samples.shakespeare`
    GROUP BY corpus;
"""

# Start the query, passing in the extra configuration.
query_job = client.query(sql, job_config=job_config)  # Make an API request.

# Check on the progress by getting the job's updated state. Once the state
# is `DONE`, the results are ready.
query_job = typing.cast(
    "bigquery.QueryJob",
    client.get_job(
        query_job.job_id, location=query_job.location
    ),  # Make an API request.
)

print("Job {} is currently in state {}".format(query_job.job_id, query_job.state))

Étapes suivantes

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