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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AIRFLOW-2795) Oracle to Oracle Transfer Operator
Date Tue, 31 Jul 2018 19:23:00 GMT

    [ https://issues.apache.org/jira/browse/AIRFLOW-2795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16564244#comment-16564244
] 

ASF GitHub Bot commented on AIRFLOW-2795:
-----------------------------------------

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.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
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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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> Oracle to Oracle Transfer Operator 
> -----------------------------------
>
>                 Key: AIRFLOW-2795
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-2795
>             Project: Apache Airflow
>          Issue Type: New Feature
>          Components: operators
>            Reporter: Marcus Rehm
>            Assignee: Marcus Rehm
>            Priority: Trivial
>
> This operator should help in transfer data from one Oracle instance to another or between
tables in the same instance. t's suitable in use cases where you don't want to or it's not
allowed use dblink.
> The operator needs a sql query and a destination table in order to work.



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