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# -*- 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.postgres_hook import PostgresHook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
class PostgresOperator(BaseOperator):
"""
Executes sql code in a specific Postgres database
:param sql: the sql code to be executed. (templated)
:type sql: Can receive a str representing a sql statement,
a list of str (sql statements), or reference to a template file.
Template reference are recognized by str ending in '.sql'
:param postgres_conn_id: reference to a specific postgres database
:type postgres_conn_id: str
:param autocommit: if True, each command is automatically committed.
(default value: False)
:type autocommit: bool
:param parameters: (optional) the parameters to render the SQL query with.
:type parameters: mapping or iterable
:param database: name of database which overwrite defined one in connection
:type database: str
"""
template_fields = ('sql',)
template_ext = ('.sql',)
ui_color = '#ededed'
@apply_defaults
def __init__(
self, sql,
postgres_conn_id='postgres_default', autocommit=False,
parameters=None,
database=None,
*args, **kwargs):
super(PostgresOperator, self).__init__(*args, **kwargs)
self.sql = sql
self.postgres_conn_id = postgres_conn_id
self.autocommit = autocommit
self.parameters = parameters
self.database = database
def execute(self, context):
self.log.info('Executing: %s', self.sql)
self.hook = PostgresHook(postgres_conn_id=self.postgres_conn_id,
schema=self.database)
self.hook.run(self.sql, self.autocommit, parameters=self.parameters)
for output in self.hook.conn.notices:
self.log.info(output)
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