Exportar resultados de consultas

Exporta los resultados de las consultas a un depósito de Amazon S3.

Muestra de código

Java

Antes de probar este ejemplo, sigue las instrucciones de configuración para Java que se encuentran en la guía de inicio rápido de BigQuery sobre cómo usar bibliotecas cliente. Para obtener más información, consulta la documentación de referencia de la API de BigQuery para 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 export query results to Amazon S3 bucket
public class ExportQueryResultsToS3 {

  public static void main(String[] args) throws InterruptedException {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "MY_PROJECT_ID";
    String datasetName = "MY_DATASET_NAME";
    String externalTableName = "MY_EXTERNAL_TABLE_NAME";
    // connectionName should be in the format of connection_region.connection_name. e.g.
    // aws-us-east-1.s3-write-conn
    String connectionName = "MY_CONNECTION_REGION.MY_CONNECTION_NAME";
    // destinationUri must contain exactly one * anywhere in the leaf directory of the path string
    // e.g. ../aa/*, ../aa/b*c, ../aa/*bc, and ../aa/bc*
    // BigQuery replaces * with 0000..N depending on the number of files exported.
    // BigQuery determines the file count and sizes.
    String destinationUri = "s3://your-bucket-name/*";
    String format = "EXPORT_FORMAT";
    // Export result of query to find states starting with 'W'
    String query =
        String.format(
            "EXPORT DATA WITH CONNECTION `%s` OPTIONS(uri='%s', format='%s') "
                + "AS SELECT * FROM %s.%s.%s WHERE name LIKE 'W%%'",
            connectionName, destinationUri, format, projectId, datasetName, externalTableName);
    exportQueryResultsToS3(query);
  }

  public static void exportQueryResultsToS3(String query) throws InterruptedException {
    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();

      TableResult results = bigquery.query(QueryJobConfiguration.of(query));

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

      System.out.println("Query results exported to Amazon S3 successfully.");
    } catch (BigQueryException e) {
      System.out.println("Query not performed \n" + e.toString());
    }
  }
}