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# Copyright 2015 Oliver Cope
#
# 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.
# See the License for the specific language governing permissions and
# limitations under the License.
from contextlib import contextmanager
from yoyo.backends.base import DatabaseBackend
class PostgresqlBackend(DatabaseBackend):
driver_module = "psycopg2"
schema = None
list_tables_sql = (
"SELECT table_name FROM information_schema.tables "
"WHERE table_schema = :schema"
)
def connect(self, dburi):
kwargs = {"dbname": dburi.database}
kwargs.update(dburi.args)
if dburi.username is not None:
kwargs["user"] = dburi.username
if dburi.password is not None:
kwargs["password"] = dburi.password
if dburi.port is not None:
kwargs["port"] = dburi.port
if dburi.hostname is not None:
kwargs["host"] = dburi.hostname
self.schema = kwargs.pop("schema", None)
return self.driver.connect(**kwargs)
@contextmanager
def disable_transactions(self):
with super(PostgresqlBackend, self).disable_transactions():
saved = self.connection.autocommit
self.connection.autocommit = True
yield
self.connection.autocommit = saved
def init_connection(self, connection):
if self.schema:
cursor = connection.cursor()
cursor.execute("SET search_path TO {}".format(self.schema))
def list_tables(self):
current_schema = self.execute("SELECT current_schema").fetchone()[0]
return super(PostgresqlBackend, self).list_tables(schema=current_schema)
class PostgresqlPsycopgBackend(PostgresqlBackend):
"""
Like PostgresqlBackend, but using the newer Psycopg 3.
"""
driver_module = "psycopg"
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