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Posted to dev@airflow.apache.org by GitBox <gi...@apache.org> on 2018/07/31 19:22:42 UTC
[GitHub] Fokko closed pull request #3639: [AIRFLOW-2795] Oracle to Oracle
Transfer Operator
Fokko closed pull request #3639: [AIRFLOW-2795] Oracle to Oracle Transfer Operator
URL: https://github.com/apache/incubator-airflow/pull/3639
This is a PR merged from a forked repository.
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diff --git a/airflow/contrib/operators/oracle_to_oracle_transfer.py b/airflow/contrib/operators/oracle_to_oracle_transfer.py
new file mode 100644
index 0000000000..31eb89b7dd
--- /dev/null
+++ b/airflow/contrib/operators/oracle_to_oracle_transfer.py
@@ -0,0 +1,90 @@
+# -*- 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
+#
+# 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. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+from airflow.hooks.oracle_hook import OracleHook
+from airflow.models import BaseOperator
+from airflow.utils.decorators import apply_defaults
+
+
+class OracleToOracleTransfer(BaseOperator):
+ """
+ Moves data from Oracle to Oracle.
+
+
+ :param oracle_destination_conn_id: destination Oracle connection.
+ :type oracle_destination_conn_id: str
+ :param destination_table: destination table to insert rows.
+ :type destination_table: str
+ :param oracle_source_conn_id: source Oracle connection.
+ :type oracle_source_conn_id: str
+ :param source_sql: SQL query to execute against the source Oracle
+ database. (templated)
+ :type source_sql: str
+ :param source_sql_params: Parameters to use in sql query. (templated)
+ :type source_sql_params: dict
+ :param rows_chunk: number of rows per chunk to commit.
+ :type rows_chunk: int
+ """
+
+ template_fields = ('source_sql', 'source_sql_params')
+ ui_color = '#e08c8c'
+
+ @apply_defaults
+ def __init__(
+ self,
+ oracle_destination_conn_id,
+ destination_table,
+ oracle_source_conn_id,
+ source_sql,
+ source_sql_params={},
+ rows_chunk=5000,
+ *args, **kwargs):
+ super(OracleToOracleTransfer, self).__init__(*args, **kwargs)
+ self.oracle_destination_conn_id = oracle_destination_conn_id
+ self.destination_table = destination_table
+ self.oracle_source_conn_id = oracle_source_conn_id
+ self.source_sql = source_sql
+ self.source_sql_params = source_sql_params
+ self.rows_chunk = rows_chunk
+
+ def _execute(self, src_hook, dest_hook, context):
+ with src_hook.get_conn() as src_conn:
+ cursor = src_conn.cursor()
+ self.log.info("Querying data from source: {0}".format(
+ self.oracle_source_conn_id))
+ cursor.execute(self.source_sql, self.source_sql_params)
+ target_fields = list(map(lambda field: field[0], cursor.description))
+
+ rows_total = 0
+ rows = cursor.fetchmany(self.rows_chunk)
+ while len(rows) > 0:
+ rows_total = rows_total + len(rows)
+ dest_hook.bulk_insert_rows(self.destination_table, rows,
+ target_fields=target_fields,
+ commit_every=self.rows_chunk)
+ rows = cursor.fetchmany(self.rows_chunk)
+ self.log.info("Total inserted: {0} rows".format(rows_total))
+
+ self.log.info("Finished data transfer.")
+ cursor.close()
+
+ def execute(self, context):
+ src_hook = OracleHook(oracle_conn_id=self.oracle_source_conn_id)
+ dest_hook = OracleHook(oracle_conn_id=self.oracle_destination_conn_id)
+ self._execute(src_hook, dest_hook, context)
diff --git a/docs/code.rst b/docs/code.rst
index 4f1b301711..f4f55b7b38 100644
--- a/docs/code.rst
+++ b/docs/code.rst
@@ -172,6 +172,7 @@ Operators
.. autoclass:: airflow.contrib.operators.mongo_to_s3.MongoToS3Operator
.. autoclass:: airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator
.. autoclass:: airflow.contrib.operators.oracle_to_azure_data_lake_transfer.OracleToAzureDataLakeTransfer
+.. autoclass:: airflow.contrib.operators.oracle_to_oracle_transfer.OracleToOracleTransfer
.. autoclass:: airflow.contrib.operators.postgres_to_gcs_operator.PostgresToGoogleCloudStorageOperator
.. autoclass:: airflow.contrib.operators.pubsub_operator.PubSubTopicCreateOperator
.. autoclass:: airflow.contrib.operators.pubsub_operator.PubSubTopicDeleteOperator
diff --git a/tests/contrib/operators/test_oracle_to_oracle_transfer.py b/tests/contrib/operators/test_oracle_to_oracle_transfer.py
new file mode 100644
index 0000000000..83d25e05a3
--- /dev/null
+++ b/tests/contrib/operators/test_oracle_to_oracle_transfer.py
@@ -0,0 +1,80 @@
+# -*- 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
+#
+# 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. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+import unittest
+from airflow.contrib.operators.oracle_to_oracle_transfer \
+ import OracleToOracleTransfer
+
+try:
+ from unittest import mock
+ from unittest.mock import MagicMock
+except ImportError:
+ try:
+ import mock
+ from mock import MagicMock
+ except ImportError:
+ mock = None
+
+
+class OracleToOracleTransferTest(unittest.TestCase):
+
+ def test_execute(self):
+ oracle_destination_conn_id = 'oracle_destination_conn_id'
+ destination_table = 'destination_table'
+ oracle_source_conn_id = 'oracle_source_conn_id'
+ source_sql = "select sysdate from dual where trunc(sysdate) = :p_data"
+ source_sql_params = {':p_data': "2018-01-01"}
+ rows_chunk = 5000
+ cursor_description = [
+ ('id', "<class 'cx_Oracle.NUMBER'>", 39, None, 38, 0, 0),
+ ('description', "<class 'cx_Oracle.STRING'>", 60, 240, None, None, 1)
+ ]
+ cursor_rows = [[1, 'description 1'], [2, 'description 2']]
+
+ mock_dest_hook = MagicMock()
+ mock_src_hook = MagicMock()
+ mock_src_conn = mock_src_hook.get_conn.return_value.__enter__.return_value
+ mock_cursor = mock_src_conn.cursor.return_value
+ mock_cursor.description.__iter__.return_value = cursor_description
+ mock_cursor.fetchmany.side_effect = [cursor_rows, []]
+
+ op = OracleToOracleTransfer(
+ task_id='copy_data',
+ oracle_destination_conn_id=oracle_destination_conn_id,
+ destination_table=destination_table,
+ oracle_source_conn_id=oracle_source_conn_id,
+ source_sql=source_sql,
+ source_sql_params=source_sql_params,
+ rows_chunk=rows_chunk)
+
+ op._execute(mock_src_hook, mock_dest_hook, None)
+
+ assert mock_src_hook.get_conn.called
+ assert mock_src_conn.cursor.called
+ mock_cursor.execute.assert_called_with(source_sql, source_sql_params)
+ mock_cursor.fetchmany.assert_called_with(rows_chunk)
+ mock_dest_hook.bulk_insert_rows.assert_called_once_with(
+ destination_table,
+ cursor_rows,
+ commit_every=rows_chunk,
+ target_fields=['id', 'description'])
+
+
+if __name__ == '__main__':
+ unittest.main()
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