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ad3a198919
Plus, some more care in objects life cycle, mostly in exceptions handling. Closes ticket #81.
293 lines
11 KiB
Python
Executable File
293 lines
11 KiB
Python
Executable File
#!/usr/bin/env python
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# test_cursor.py - unit test for cursor attributes
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#
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# Copyright (C) 2010-2011 Daniele Varrazzo <daniele.varrazzo@gmail.com>
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#
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# psycopg2 is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# In addition, as a special exception, the copyright holders give
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# permission to link this program with the OpenSSL library (or with
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# modified versions of OpenSSL that use the same license as OpenSSL),
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# and distribute linked combinations including the two.
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#
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# You must obey the GNU Lesser General Public License in all respects for
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# all of the code used other than OpenSSL.
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#
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# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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# License for more details.
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import time
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import psycopg2
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import psycopg2.extensions
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from psycopg2.extensions import b
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from testconfig import dsn
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from testutils import unittest, skip_before_postgres, skip_if_no_namedtuple
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class CursorTests(unittest.TestCase):
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def setUp(self):
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self.conn = psycopg2.connect(dsn)
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def tearDown(self):
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self.conn.close()
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def test_empty_query(self):
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cur = self.conn.cursor()
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self.assertRaises(psycopg2.ProgrammingError, cur.execute, "")
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self.assertRaises(psycopg2.ProgrammingError, cur.execute, " ")
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self.assertRaises(psycopg2.ProgrammingError, cur.execute, ";")
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def test_executemany_propagate_exceptions(self):
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conn = self.conn
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cur = conn.cursor()
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cur.execute("create temp table test_exc (data int);")
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def buggygen():
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yield 1//0
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self.assertRaises(ZeroDivisionError,
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cur.executemany, "insert into test_exc values (%s)", buggygen())
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cur.close()
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def test_mogrify_unicode(self):
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conn = self.conn
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cur = conn.cursor()
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# test consistency between execute and mogrify.
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# unicode query containing only ascii data
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cur.execute(u"SELECT 'foo';")
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self.assertEqual('foo', cur.fetchone()[0])
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self.assertEqual(b("SELECT 'foo';"), cur.mogrify(u"SELECT 'foo';"))
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conn.set_client_encoding('UTF8')
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snowman = u"\u2603"
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# unicode query with non-ascii data
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cur.execute(u"SELECT '%s';" % snowman)
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self.assertEqual(snowman.encode('utf8'), b(cur.fetchone()[0]))
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self.assertEqual(("SELECT '%s';" % snowman).encode('utf8'),
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cur.mogrify(u"SELECT '%s';" % snowman).replace(b("E'"), b("'")))
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# unicode args
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cur.execute("SELECT %s;", (snowman,))
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self.assertEqual(snowman.encode("utf-8"), b(cur.fetchone()[0]))
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self.assertEqual(("SELECT '%s';" % snowman).encode('utf8'),
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cur.mogrify("SELECT %s;", (snowman,)).replace(b("E'"), b("'")))
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# unicode query and args
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cur.execute(u"SELECT %s;", (snowman,))
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self.assertEqual(snowman.encode("utf-8"), b(cur.fetchone()[0]))
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self.assertEqual(("SELECT '%s';" % snowman).encode('utf8'),
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cur.mogrify(u"SELECT %s;", (snowman,)).replace(b("E'"), b("'")))
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def test_mogrify_decimal_explodes(self):
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# issue #7: explodes on windows with python 2.5 and psycopg 2.2.2
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try:
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from decimal import Decimal
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except:
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return
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conn = self.conn
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cur = conn.cursor()
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self.assertEqual(b('SELECT 10.3;'),
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cur.mogrify("SELECT %s;", (Decimal("10.3"),)))
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def test_mogrify_leak_on_multiple_reference(self):
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# issue #81: reference leak when a parameter value is referenced
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# more than once from a dict.
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cur = self.conn.cursor()
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i = lambda x: x
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foo = i('foo') * 10
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import sys
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nref1 = sys.getrefcount(foo)
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cur.mogrify("select %(foo)s, %(foo)s, %(foo)s", {'foo': foo})
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nref2 = sys.getrefcount(foo)
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self.assertEqual(nref1, nref2)
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def test_bad_placeholder(self):
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cur = self.conn.cursor()
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self.assertRaises(psycopg2.ProgrammingError,
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cur.mogrify, "select %(foo", {})
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self.assertRaises(psycopg2.ProgrammingError,
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cur.mogrify, "select %(foo", {'foo': 1})
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self.assertRaises(psycopg2.ProgrammingError,
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cur.mogrify, "select %(foo, %(bar)", {'foo': 1})
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self.assertRaises(psycopg2.ProgrammingError,
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cur.mogrify, "select %(foo, %(bar)", {'foo': 1, 'bar': 2})
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def test_cast(self):
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curs = self.conn.cursor()
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self.assertEqual(42, curs.cast(20, '42'))
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self.assertAlmostEqual(3.14, curs.cast(700, '3.14'))
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try:
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from decimal import Decimal
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except ImportError:
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self.assertAlmostEqual(123.45, curs.cast(1700, '123.45'))
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else:
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self.assertEqual(Decimal('123.45'), curs.cast(1700, '123.45'))
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from datetime import date
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self.assertEqual(date(2011,1,2), curs.cast(1082, '2011-01-02'))
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self.assertEqual("who am i?", curs.cast(705, 'who am i?')) # unknown
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def test_cast_specificity(self):
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curs = self.conn.cursor()
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self.assertEqual("foo", curs.cast(705, 'foo'))
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D = psycopg2.extensions.new_type((705,), "DOUBLING", lambda v, c: v * 2)
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psycopg2.extensions.register_type(D, self.conn)
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self.assertEqual("foofoo", curs.cast(705, 'foo'))
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T = psycopg2.extensions.new_type((705,), "TREBLING", lambda v, c: v * 3)
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psycopg2.extensions.register_type(T, curs)
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self.assertEqual("foofoofoo", curs.cast(705, 'foo'))
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curs2 = self.conn.cursor()
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self.assertEqual("foofoo", curs2.cast(705, 'foo'))
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def test_weakref(self):
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from weakref import ref
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curs = self.conn.cursor()
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w = ref(curs)
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del curs
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self.assert_(w() is None)
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def test_invalid_name(self):
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curs = self.conn.cursor()
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curs.execute("create temp table invname (data int);")
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for i in (10,20,30):
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curs.execute("insert into invname values (%s)", (i,))
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curs.close()
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curs = self.conn.cursor(r'1-2-3 \ "test"')
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curs.execute("select data from invname order by data")
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self.assertEqual(curs.fetchall(), [(10,), (20,), (30,)])
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def test_withhold(self):
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self.assertRaises(psycopg2.ProgrammingError, self.conn.cursor,
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withhold=True)
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curs = self.conn.cursor()
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try:
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curs.execute("drop table withhold")
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except psycopg2.ProgrammingError:
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self.conn.rollback()
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curs.execute("create table withhold (data int)")
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for i in (10, 20, 30):
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curs.execute("insert into withhold values (%s)", (i,))
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curs.close()
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curs = self.conn.cursor("W")
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self.assertEqual(curs.withhold, False);
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curs.withhold = True
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self.assertEqual(curs.withhold, True);
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curs.execute("select data from withhold order by data")
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self.conn.commit()
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self.assertEqual(curs.fetchall(), [(10,), (20,), (30,)])
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curs.close()
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curs = self.conn.cursor("W", withhold=True)
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self.assertEqual(curs.withhold, True);
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curs.execute("select data from withhold order by data")
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self.conn.commit()
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self.assertEqual(curs.fetchall(), [(10,), (20,), (30,)])
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curs = self.conn.cursor()
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curs.execute("drop table withhold")
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self.conn.commit()
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@skip_before_postgres(8, 2)
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def test_iter_named_cursor_efficient(self):
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curs = self.conn.cursor('tmp')
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# if these records are fetched in the same roundtrip their
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# timestamp will not be influenced by the pause in Python world.
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curs.execute("""select clock_timestamp() from generate_series(1,2)""")
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i = iter(curs)
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t1 = (i.next())[0] # the brackets work around a 2to3 bug
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time.sleep(0.2)
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t2 = (i.next())[0]
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self.assert_((t2 - t1).microseconds * 1e-6 < 0.1,
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"named cursor records fetched in 2 roundtrips (delta: %s)"
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% (t2 - t1))
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@skip_before_postgres(8, 0)
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def test_iter_named_cursor_default_itersize(self):
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curs = self.conn.cursor('tmp')
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curs.execute('select generate_series(1,50)')
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rv = [ (r[0], curs.rownumber) for r in curs ]
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# everything swallowed in one gulp
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self.assertEqual(rv, [(i,i) for i in range(1,51)])
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@skip_before_postgres(8, 0)
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def test_iter_named_cursor_itersize(self):
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curs = self.conn.cursor('tmp')
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curs.itersize = 30
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curs.execute('select generate_series(1,50)')
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rv = [ (r[0], curs.rownumber) for r in curs ]
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# everything swallowed in two gulps
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self.assertEqual(rv, [(i,((i - 1) % 30) + 1) for i in range(1,51)])
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@skip_if_no_namedtuple
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def test_namedtuple_description(self):
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curs = self.conn.cursor()
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curs.execute("""select
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3.14::decimal(10,2) as pi,
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'hello'::text as hi,
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'2010-02-18'::date as now;
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""")
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self.assertEqual(len(curs.description), 3)
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for c in curs.description:
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self.assertEqual(len(c), 7) # DBAPI happy
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for a in ('name', 'type_code', 'display_size', 'internal_size',
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'precision', 'scale', 'null_ok'):
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self.assert_(hasattr(c, a), a)
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c = curs.description[0]
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self.assertEqual(c.name, 'pi')
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self.assert_(c.type_code in psycopg2.extensions.DECIMAL.values)
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self.assert_(c.internal_size > 0)
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self.assertEqual(c.precision, 10)
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self.assertEqual(c.scale, 2)
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c = curs.description[1]
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self.assertEqual(c.name, 'hi')
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self.assert_(c.type_code in psycopg2.STRING.values)
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self.assert_(c.internal_size < 0)
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self.assertEqual(c.precision, None)
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self.assertEqual(c.scale, None)
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c = curs.description[2]
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self.assertEqual(c.name, 'now')
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self.assert_(c.type_code in psycopg2.extensions.DATE.values)
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self.assert_(c.internal_size > 0)
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self.assertEqual(c.precision, None)
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self.assertEqual(c.scale, None)
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@skip_before_postgres(8, 0)
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def test_named_cursor_stealing(self):
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# you can use a named cursor to iterate on a refcursor created
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# somewhere else
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cur1 = self.conn.cursor()
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cur1.execute("DECLARE test CURSOR WITHOUT HOLD "
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" FOR SELECT generate_series(1,7)")
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cur2 = self.conn.cursor('test')
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# can call fetch without execute
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self.assertEqual((1,), cur2.fetchone())
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self.assertEqual([(2,), (3,), (4,)], cur2.fetchmany(3))
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self.assertEqual([(5,), (6,), (7,)], cur2.fetchall())
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def test_suite():
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return unittest.TestLoader().loadTestsFromName(__name__)
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if __name__ == "__main__":
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unittest.main()
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