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#!/usr/bin/env python
# test_ctxman.py - unit test for connection and cursor used as context manager
#
# Copyright (C) 2012-2019 Daniele Varrazzo <daniele.varrazzo@gmail.com>
# Copyright (C) 2020 The Psycopg Team
#
# psycopg2 is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# In addition, as a special exception, the copyright holders give
# permission to link this program with the OpenSSL library (or with
# modified versions of OpenSSL that use the same license as OpenSSL),
# and distribute linked combinations including the two.
#
# You must obey the GNU Lesser General Public License in all respects for
# all of the code used other than OpenSSL.
#
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
# License for more details.
import psycopg2
import psycopg2.extensions as ext
import unittest
from .testutils import ConnectingTestCase, skip_before_postgres
class WithTestCase(ConnectingTestCase):
def setUp(self):
ConnectingTestCase.setUp(self)
curs = self.conn.cursor()
try:
curs.execute("delete from test_with")
self.conn.commit()
except psycopg2.ProgrammingError:
# assume table doesn't exist
self.conn.rollback()
curs.execute("create table test_with (id integer primary key)")
self.conn.commit()
class WithConnectionTestCase(WithTestCase):
def test_with_ok(self):
with self.conn as conn:
self.assert_(self.conn is conn)
self.assertEqual(conn.status, ext.STATUS_READY)
curs = conn.cursor()
curs.execute("insert into test_with values (1)")
self.assertEqual(conn.status, ext.STATUS_BEGIN)
self.assertEqual(self.conn.status, ext.STATUS_READY)
self.assert_(not self.conn.closed)
curs = self.conn.cursor()
curs.execute("select * from test_with")
self.assertEqual(curs.fetchall(), [(1,)])
def test_with_connect_idiom(self):
with self.connect() as conn:
self.assertEqual(conn.status, ext.STATUS_READY)
curs = conn.cursor()
curs.execute("insert into test_with values (2)")
self.assertEqual(conn.status, ext.STATUS_BEGIN)
self.assertEqual(self.conn.status, ext.STATUS_READY)
self.assert_(not self.conn.closed)
curs = self.conn.cursor()
curs.execute("select * from test_with")
self.assertEqual(curs.fetchall(), [(2,)])
def test_with_error_db(self):
def f():
with self.conn as conn:
curs = conn.cursor()
curs.execute("insert into test_with values ('a')")
self.assertRaises(psycopg2.DataError, f)
self.assertEqual(self.conn.status, ext.STATUS_READY)
self.assert_(not self.conn.closed)
curs = self.conn.cursor()
curs.execute("select * from test_with")
self.assertEqual(curs.fetchall(), [])
def test_with_error_python(self):
def f():
with self.conn as conn:
curs = conn.cursor()
curs.execute("insert into test_with values (3)")
1 / 0
self.assertRaises(ZeroDivisionError, f)
self.assertEqual(self.conn.status, ext.STATUS_READY)
self.assert_(not self.conn.closed)
curs = self.conn.cursor()
curs.execute("select * from test_with")
self.assertEqual(curs.fetchall(), [])
def test_with_closed(self):
def f():
with self.conn:
pass
self.conn.close()
self.assertRaises(psycopg2.InterfaceError, f)
def test_subclass_commit(self):
commits = []
class MyConn(ext.connection):
def commit(self):
commits.append(None)
super(MyConn, self).commit()
with self.connect(connection_factory=MyConn) as conn:
curs = conn.cursor()
curs.execute("insert into test_with values (10)")
self.assertEqual(conn.status, ext.STATUS_READY)
self.assert_(commits)
curs = self.conn.cursor()
curs.execute("select * from test_with")
self.assertEqual(curs.fetchall(), [(10,)])
def test_subclass_rollback(self):
rollbacks = []
class MyConn(ext.connection):
def rollback(self):
rollbacks.append(None)
super(MyConn, self).rollback()
try:
with self.connect(connection_factory=MyConn) as conn:
curs = conn.cursor()
curs.execute("insert into test_with values (11)")
1 / 0
except ZeroDivisionError:
pass
else:
self.assert_("exception not raised")
self.assertEqual(conn.status, ext.STATUS_READY)
self.assert_(rollbacks)
curs = conn.cursor()
curs.execute("select * from test_with")
self.assertEqual(curs.fetchall(), [])
class WithCursorTestCase(WithTestCase):
def test_with_ok(self):
with self.conn as conn:
with conn.cursor() as curs:
curs.execute("insert into test_with values (4)")
self.assert_(not curs.closed)
self.assertEqual(self.conn.status, ext.STATUS_BEGIN)
self.assert_(curs.closed)
self.assertEqual(self.conn.status, ext.STATUS_READY)
self.assert_(not self.conn.closed)
curs = self.conn.cursor()
curs.execute("select * from test_with")
self.assertEqual(curs.fetchall(), [(4,)])
def test_with_error(self):
try:
with self.conn as conn:
with conn.cursor() as curs:
curs.execute("insert into test_with values (5)")
1 / 0
except ZeroDivisionError:
pass
self.assertEqual(self.conn.status, ext.STATUS_READY)
self.assert_(not self.conn.closed)
self.assert_(curs.closed)
curs = self.conn.cursor()
curs.execute("select * from test_with")
self.assertEqual(curs.fetchall(), [])
def test_subclass(self):
closes = []
class MyCurs(ext.cursor):
def close(self):
closes.append(None)
super(MyCurs, self).close()
with self.conn.cursor(cursor_factory=MyCurs) as curs:
self.assert_(isinstance(curs, MyCurs))
self.assert_(curs.closed)
self.assert_(closes)
def test_exception_swallow(self):
# bug #262: __exit__ calls cur.close() that hides the exception
# with another error.
try:
with self.conn as conn:
with conn.cursor('named') as cur:
cur.execute("select 1/0")
cur.fetchone()
except psycopg2.DataError as e:
self.assertEqual(e.pgcode, '22012')
else:
self.fail("where is my exception?")
@skip_before_postgres(8, 2)
def test_named_with_noop(self):
with self.conn.cursor('named'):
pass
def test_suite():
return unittest.TestLoader().loadTestsFromName(__name__)
if __name__ == "__main__":
unittest.main()
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