# -*- coding: utf-8 -*-
#
# Licensed 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
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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import logging
from airflow.contrib.hooks.bigquery_hook import BigQueryHook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
[docs]class BigQueryToBigQueryOperator(BaseOperator):
"""
Copy a BigQuery table to another BigQuery table.
"""
template_fields = ('source_project_dataset_tables',
'destination_project_dataset_table')
template_ext = ('.sql',)
ui_color = '#e6f0e4'
@apply_defaults
def __init__(
self,
source_project_dataset_tables,
destination_project_dataset_table,
write_disposition='WRITE_EMPTY',
create_disposition='CREATE_IF_NEEDED',
bigquery_conn_id='bigquery_default',
delegate_to=None,
*args,
**kwargs):
"""
Copies data from one BigQuery table to another. See here:
https://cloud.google.com/bigquery/docs/reference/v2/jobs#configuration.copy
For more details about these parameters.
:param source_project_dataset_tables: One or more
dotted (project:|project.)<dataset>.<table> BigQuery tables to use as the
source data. If <project> is not included, project will be the project defined
in the connection json. Use a list if there are multiple source tables.
:type source_project_dataset_tables: list|string
:param destination_project_dataset_table: The destination BigQuery
table. Format is: (project:|project.)<dataset>.<table>
:type destination_project_dataset_table: string
:param write_disposition: The write disposition if the table already exists.
:type write_disposition: string
:param create_disposition: The create disposition if the table doesn't exist.
:type create_disposition: string
: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
"""
super(BigQueryToBigQueryOperator, self).__init__(*args, **kwargs)
self.source_project_dataset_tables = source_project_dataset_tables
self.destination_project_dataset_table = destination_project_dataset_table
self.write_disposition = write_disposition
self.create_disposition = create_disposition
self.bigquery_conn_id = bigquery_conn_id
self.delegate_to = delegate_to
def execute(self, context):
logging.info('Executing copy of %s into: %s', self.source_project_dataset_tables,
self.destination_project_dataset_table)
hook = BigQueryHook(bigquery_conn_id=self.bigquery_conn_id,
delegate_to=self.delegate_to)
conn = hook.get_conn()
cursor = conn.cursor()
cursor.run_copy(
self.source_project_dataset_tables,
self.destination_project_dataset_table,
self.write_disposition,
self.create_disposition)