mirror of
https://github.com/psycopg/psycopg2.git
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7221ea9ec5
Actually *it doesn't*: once we iterate the first itersize records, rowcount is reset to zero. If we want to fix it we need an extra member in the cursor.
353 lines
13 KiB
Python
Executable File
353 lines
13 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_before_postgres(8, 0)
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def test_iter_named_cursor_rownumber(self):
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curs = self.conn.cursor('tmp')
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# note: this fails if itersize < dataset: internally we check
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# rownumber == rowcount to detect when to read anoter page, so we
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# would need an extra attribute to have a monotonic rownumber.
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curs.itersize = 20
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curs.execute('select generate_series(1,10)')
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for i, rec in enumerate(curs):
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self.assertEqual(i + 1, curs.rownumber)
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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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@skip_before_postgres(8, 0)
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def test_scroll(self):
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cur = self.conn.cursor()
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cur.execute("select generate_series(0,9)")
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cur.scroll(2)
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self.assertEqual(cur.fetchone(), (2,))
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cur.scroll(2)
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self.assertEqual(cur.fetchone(), (5,))
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cur.scroll(2, mode='relative')
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self.assertEqual(cur.fetchone(), (8,))
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cur.scroll(-1)
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self.assertEqual(cur.fetchone(), (8,))
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cur.scroll(-2)
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self.assertEqual(cur.fetchone(), (7,))
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cur.scroll(2, mode='absolute')
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self.assertEqual(cur.fetchone(), (2,))
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# on the boundary
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cur.scroll(0, mode='absolute')
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self.assertEqual(cur.fetchone(), (0,))
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self.assertRaises((IndexError, psycopg2.ProgrammingError),
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cur.scroll, -1, mode='absolute')
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cur.scroll(0, mode='absolute')
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self.assertRaises((IndexError, psycopg2.ProgrammingError),
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cur.scroll, -1)
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cur.scroll(9, mode='absolute')
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self.assertEqual(cur.fetchone(), (9,))
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self.assertRaises((IndexError, psycopg2.ProgrammingError),
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cur.scroll, 10, mode='absolute')
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cur.scroll(9, mode='absolute')
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self.assertRaises((IndexError, psycopg2.ProgrammingError),
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cur.scroll, 1)
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@skip_before_postgres(8, 0)
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def test_scroll_named(self):
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cur = self.conn.cursor()
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cur.execute("select generate_series(0,9)")
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cur.scroll(2)
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self.assertEqual(cur.fetchone(), (2,))
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cur.scroll(2)
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self.assertEqual(cur.fetchone(), (5,))
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cur.scroll(2, mode='relative')
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self.assertEqual(cur.fetchone(), (8,))
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cur.scroll(9, mode='absolute')
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self.assertEqual(cur.fetchone(), (9,))
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self.assertRaises((IndexError, psycopg2.ProgrammingError),
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cur.scroll, 10, mode='absolute')
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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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