Source code for airflow.contrib.operators.bigquery_to_gcs

# -*- coding: utf-8 -*-
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

from airflow.contrib.hooks.bigquery_hook import BigQueryHook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults

[docs]class BigQueryToCloudStorageOperator(BaseOperator): """ Transfers a BigQuery table to a Google Cloud Storage bucket. .. seealso:: For more details about these parameters: :param source_project_dataset_table: The dotted (<project>.|<project>:)<dataset>.<table> BigQuery table to use as the source data. If <project> is not included, project will be the project defined in the connection json. (templated) :type source_project_dataset_table: string :param destination_cloud_storage_uris: The destination Google Cloud Storage URI (e.g. gs://some-bucket/some-file.txt). (templated) Follows convention defined here: :type destination_cloud_storage_uris: list :param compression: Type of compression to use. :type compression: string :param export_format: File format to export. :type field_delimiter: string :param field_delimiter: The delimiter to use when extracting to a CSV. :type field_delimiter: string :param print_header: Whether to print a header for a CSV file extract. :type print_header: boolean :param bigquery_conn_id: reference to a specific BigQuery hook. :type bigquery_conn_id: string :param delegate_to: The account to impersonate, if any. For this to work, the service account making the request must have domain-wide delegation enabled. :type delegate_to: string :param labels: a dictionary containing labels for the job/query, passed to BigQuery :type labels: dict """ template_fields = ('source_project_dataset_table', 'destination_cloud_storage_uris', 'labels') template_ext = ('.sql',) ui_color = '#e4e6f0' @apply_defaults def __init__(self, source_project_dataset_table, destination_cloud_storage_uris, compression='NONE', export_format='CSV', field_delimiter=',', print_header=True, bigquery_conn_id='bigquery_default', delegate_to=None, labels=None, *args, **kwargs): super(BigQueryToCloudStorageOperator, self).__init__(*args, **kwargs) self.source_project_dataset_table = source_project_dataset_table self.destination_cloud_storage_uris = destination_cloud_storage_uris self.compression = compression self.export_format = export_format self.field_delimiter = field_delimiter self.print_header = print_header self.bigquery_conn_id = bigquery_conn_id self.delegate_to = delegate_to self.labels = labels
[docs] def execute(self, context):'Executing extract of %s into: %s', self.source_project_dataset_table, self.destination_cloud_storage_uris) hook = BigQueryHook(bigquery_conn_id=self.bigquery_conn_id, delegate_to=self.delegate_to) conn = hook.get_conn() cursor = conn.cursor() cursor.run_extract( self.source_project_dataset_table, self.destination_cloud_storage_uris, self.compression, self.export_format, self.field_delimiter, self.print_header, self.labels)