/usr/lib/python2.7/dist-packages/psycopg2/tests/test_cursor.py is in python-psycopg2 2.6.1-1build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 | #!/usr/bin/env python
# test_cursor.py - unit test for cursor attributes
#
# Copyright (C) 2010-2011 Daniele Varrazzo <daniele.varrazzo@gmail.com>
#
# 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 time
import pickle
import psycopg2
import psycopg2.extensions
from psycopg2.extensions import b
from testutils import unittest, ConnectingTestCase, skip_before_postgres
from testutils import skip_if_no_namedtuple, skip_if_no_getrefcount
class CursorTests(ConnectingTestCase):
def test_close_idempotent(self):
cur = self.conn.cursor()
cur.close()
cur.close()
self.assert_(cur.closed)
def test_empty_query(self):
cur = self.conn.cursor()
self.assertRaises(psycopg2.ProgrammingError, cur.execute, "")
self.assertRaises(psycopg2.ProgrammingError, cur.execute, " ")
self.assertRaises(psycopg2.ProgrammingError, cur.execute, ";")
def test_executemany_propagate_exceptions(self):
conn = self.conn
cur = conn.cursor()
cur.execute("create temp table test_exc (data int);")
def buggygen():
yield 1//0
self.assertRaises(ZeroDivisionError,
cur.executemany, "insert into test_exc values (%s)", buggygen())
cur.close()
def test_mogrify_unicode(self):
conn = self.conn
cur = conn.cursor()
# test consistency between execute and mogrify.
# unicode query containing only ascii data
cur.execute(u"SELECT 'foo';")
self.assertEqual('foo', cur.fetchone()[0])
self.assertEqual(b("SELECT 'foo';"), cur.mogrify(u"SELECT 'foo';"))
conn.set_client_encoding('UTF8')
snowman = u"\u2603"
# unicode query with non-ascii data
cur.execute(u"SELECT '%s';" % snowman)
self.assertEqual(snowman.encode('utf8'), b(cur.fetchone()[0]))
self.assertEqual(("SELECT '%s';" % snowman).encode('utf8'),
cur.mogrify(u"SELECT '%s';" % snowman).replace(b("E'"), b("'")))
# unicode args
cur.execute("SELECT %s;", (snowman,))
self.assertEqual(snowman.encode("utf-8"), b(cur.fetchone()[0]))
self.assertEqual(("SELECT '%s';" % snowman).encode('utf8'),
cur.mogrify("SELECT %s;", (snowman,)).replace(b("E'"), b("'")))
# unicode query and args
cur.execute(u"SELECT %s;", (snowman,))
self.assertEqual(snowman.encode("utf-8"), b(cur.fetchone()[0]))
self.assertEqual(("SELECT '%s';" % snowman).encode('utf8'),
cur.mogrify(u"SELECT %s;", (snowman,)).replace(b("E'"), b("'")))
def test_mogrify_decimal_explodes(self):
# issue #7: explodes on windows with python 2.5 and psycopg 2.2.2
try:
from decimal import Decimal
except:
return
conn = self.conn
cur = conn.cursor()
self.assertEqual(b('SELECT 10.3;'),
cur.mogrify("SELECT %s;", (Decimal("10.3"),)))
@skip_if_no_getrefcount
def test_mogrify_leak_on_multiple_reference(self):
# issue #81: reference leak when a parameter value is referenced
# more than once from a dict.
cur = self.conn.cursor()
i = lambda x: x
foo = i('foo') * 10
import sys
nref1 = sys.getrefcount(foo)
cur.mogrify("select %(foo)s, %(foo)s, %(foo)s", {'foo': foo})
nref2 = sys.getrefcount(foo)
self.assertEqual(nref1, nref2)
def test_bad_placeholder(self):
cur = self.conn.cursor()
self.assertRaises(psycopg2.ProgrammingError,
cur.mogrify, "select %(foo", {})
self.assertRaises(psycopg2.ProgrammingError,
cur.mogrify, "select %(foo", {'foo': 1})
self.assertRaises(psycopg2.ProgrammingError,
cur.mogrify, "select %(foo, %(bar)", {'foo': 1})
self.assertRaises(psycopg2.ProgrammingError,
cur.mogrify, "select %(foo, %(bar)", {'foo': 1, 'bar': 2})
def test_cast(self):
curs = self.conn.cursor()
self.assertEqual(42, curs.cast(20, '42'))
self.assertAlmostEqual(3.14, curs.cast(700, '3.14'))
try:
from decimal import Decimal
except ImportError:
self.assertAlmostEqual(123.45, curs.cast(1700, '123.45'))
else:
self.assertEqual(Decimal('123.45'), curs.cast(1700, '123.45'))
from datetime import date
self.assertEqual(date(2011,1,2), curs.cast(1082, '2011-01-02'))
self.assertEqual("who am i?", curs.cast(705, 'who am i?')) # unknown
def test_cast_specificity(self):
curs = self.conn.cursor()
self.assertEqual("foo", curs.cast(705, 'foo'))
D = psycopg2.extensions.new_type((705,), "DOUBLING", lambda v, c: v * 2)
psycopg2.extensions.register_type(D, self.conn)
self.assertEqual("foofoo", curs.cast(705, 'foo'))
T = psycopg2.extensions.new_type((705,), "TREBLING", lambda v, c: v * 3)
psycopg2.extensions.register_type(T, curs)
self.assertEqual("foofoofoo", curs.cast(705, 'foo'))
curs2 = self.conn.cursor()
self.assertEqual("foofoo", curs2.cast(705, 'foo'))
def test_weakref(self):
from weakref import ref
curs = self.conn.cursor()
w = ref(curs)
del curs
import gc; gc.collect()
self.assert_(w() is None)
def test_null_name(self):
curs = self.conn.cursor(None)
self.assertEqual(curs.name, None)
def test_invalid_name(self):
curs = self.conn.cursor()
curs.execute("create temp table invname (data int);")
for i in (10,20,30):
curs.execute("insert into invname values (%s)", (i,))
curs.close()
curs = self.conn.cursor(r'1-2-3 \ "test"')
curs.execute("select data from invname order by data")
self.assertEqual(curs.fetchall(), [(10,), (20,), (30,)])
def _create_withhold_table(self):
curs = self.conn.cursor()
try:
curs.execute("drop table withhold")
except psycopg2.ProgrammingError:
self.conn.rollback()
curs.execute("create table withhold (data int)")
for i in (10, 20, 30):
curs.execute("insert into withhold values (%s)", (i,))
curs.close()
def test_withhold(self):
self.assertRaises(psycopg2.ProgrammingError, self.conn.cursor,
withhold=True)
self._create_withhold_table()
curs = self.conn.cursor("W")
self.assertEqual(curs.withhold, False);
curs.withhold = True
self.assertEqual(curs.withhold, True);
curs.execute("select data from withhold order by data")
self.conn.commit()
self.assertEqual(curs.fetchall(), [(10,), (20,), (30,)])
curs.close()
curs = self.conn.cursor("W", withhold=True)
self.assertEqual(curs.withhold, True);
curs.execute("select data from withhold order by data")
self.conn.commit()
self.assertEqual(curs.fetchall(), [(10,), (20,), (30,)])
curs = self.conn.cursor()
curs.execute("drop table withhold")
self.conn.commit()
def test_withhold_no_begin(self):
self._create_withhold_table()
curs = self.conn.cursor("w", withhold=True)
curs.execute("select data from withhold order by data")
self.assertEqual(curs.fetchone(), (10,))
self.assertEqual(self.conn.status, psycopg2.extensions.STATUS_BEGIN)
self.assertEqual(self.conn.get_transaction_status(),
psycopg2.extensions.TRANSACTION_STATUS_INTRANS)
self.conn.commit()
self.assertEqual(self.conn.status, psycopg2.extensions.STATUS_READY)
self.assertEqual(self.conn.get_transaction_status(),
psycopg2.extensions.TRANSACTION_STATUS_IDLE)
self.assertEqual(curs.fetchone(), (20,))
self.assertEqual(self.conn.status, psycopg2.extensions.STATUS_READY)
self.assertEqual(self.conn.get_transaction_status(),
psycopg2.extensions.TRANSACTION_STATUS_IDLE)
curs.close()
self.assertEqual(self.conn.status, psycopg2.extensions.STATUS_READY)
self.assertEqual(self.conn.get_transaction_status(),
psycopg2.extensions.TRANSACTION_STATUS_IDLE)
def test_withhold_autocommit(self):
self._create_withhold_table()
self.conn.commit()
self.conn.autocommit = True
curs = self.conn.cursor("w", withhold=True)
curs.execute("select data from withhold order by data")
self.assertEqual(curs.fetchone(), (10,))
self.assertEqual(self.conn.status, psycopg2.extensions.STATUS_READY)
self.assertEqual(self.conn.get_transaction_status(),
psycopg2.extensions.TRANSACTION_STATUS_IDLE)
self.conn.commit()
self.assertEqual(self.conn.status, psycopg2.extensions.STATUS_READY)
self.assertEqual(self.conn.get_transaction_status(),
psycopg2.extensions.TRANSACTION_STATUS_IDLE)
curs.close()
self.assertEqual(self.conn.status, psycopg2.extensions.STATUS_READY)
self.assertEqual(self.conn.get_transaction_status(),
psycopg2.extensions.TRANSACTION_STATUS_IDLE)
def test_scrollable(self):
self.assertRaises(psycopg2.ProgrammingError, self.conn.cursor,
scrollable=True)
curs = self.conn.cursor()
curs.execute("create table scrollable (data int)")
curs.executemany("insert into scrollable values (%s)",
[ (i,) for i in range(100) ])
curs.close()
for t in range(2):
if not t:
curs = self.conn.cursor("S")
self.assertEqual(curs.scrollable, None);
curs.scrollable = True
else:
curs = self.conn.cursor("S", scrollable=True)
self.assertEqual(curs.scrollable, True);
curs.itersize = 10
# complex enough to make postgres cursors declare without
# scroll/no scroll to fail
curs.execute("""
select x.data
from scrollable x
join scrollable y on x.data = y.data
order by y.data""")
for i, (n,) in enumerate(curs):
self.assertEqual(i, n)
curs.scroll(-1)
for i in range(99, -1, -1):
curs.scroll(-1)
self.assertEqual(i, curs.fetchone()[0])
curs.scroll(-1)
curs.close()
def test_not_scrollable(self):
self.assertRaises(psycopg2.ProgrammingError, self.conn.cursor,
scrollable=False)
curs = self.conn.cursor()
curs.execute("create table scrollable (data int)")
curs.executemany("insert into scrollable values (%s)",
[ (i,) for i in range(100) ])
curs.close()
curs = self.conn.cursor("S") # default scrollability
curs.execute("select * from scrollable")
self.assertEqual(curs.scrollable, None)
curs.scroll(2)
try:
curs.scroll(-1)
except psycopg2.OperationalError:
return self.skipTest("can't evaluate non-scrollable cursor")
curs.close()
curs = self.conn.cursor("S", scrollable=False)
self.assertEqual(curs.scrollable, False)
curs.execute("select * from scrollable")
curs.scroll(2)
self.assertRaises(psycopg2.OperationalError, curs.scroll, -1)
@skip_before_postgres(8, 2)
def test_iter_named_cursor_efficient(self):
curs = self.conn.cursor('tmp')
# if these records are fetched in the same roundtrip their
# timestamp will not be influenced by the pause in Python world.
curs.execute("""select clock_timestamp() from generate_series(1,2)""")
i = iter(curs)
t1 = (i.next())[0] # the brackets work around a 2to3 bug
time.sleep(0.2)
t2 = (i.next())[0]
self.assert_((t2 - t1).microseconds * 1e-6 < 0.1,
"named cursor records fetched in 2 roundtrips (delta: %s)"
% (t2 - t1))
@skip_before_postgres(8, 0)
def test_iter_named_cursor_default_itersize(self):
curs = self.conn.cursor('tmp')
curs.execute('select generate_series(1,50)')
rv = [ (r[0], curs.rownumber) for r in curs ]
# everything swallowed in one gulp
self.assertEqual(rv, [(i,i) for i in range(1,51)])
@skip_before_postgres(8, 0)
def test_iter_named_cursor_itersize(self):
curs = self.conn.cursor('tmp')
curs.itersize = 30
curs.execute('select generate_series(1,50)')
rv = [ (r[0], curs.rownumber) for r in curs ]
# everything swallowed in two gulps
self.assertEqual(rv, [(i,((i - 1) % 30) + 1) for i in range(1,51)])
@skip_before_postgres(8, 0)
def test_iter_named_cursor_rownumber(self):
curs = self.conn.cursor('tmp')
# note: this fails if itersize < dataset: internally we check
# rownumber == rowcount to detect when to read anoter page, so we
# would need an extra attribute to have a monotonic rownumber.
curs.itersize = 20
curs.execute('select generate_series(1,10)')
for i, rec in enumerate(curs):
self.assertEqual(i + 1, curs.rownumber)
@skip_if_no_namedtuple
def test_namedtuple_description(self):
curs = self.conn.cursor()
curs.execute("""select
3.14::decimal(10,2) as pi,
'hello'::text as hi,
'2010-02-18'::date as now;
""")
self.assertEqual(len(curs.description), 3)
for c in curs.description:
self.assertEqual(len(c), 7) # DBAPI happy
for a in ('name', 'type_code', 'display_size', 'internal_size',
'precision', 'scale', 'null_ok'):
self.assert_(hasattr(c, a), a)
c = curs.description[0]
self.assertEqual(c.name, 'pi')
self.assert_(c.type_code in psycopg2.extensions.DECIMAL.values)
self.assert_(c.internal_size > 0)
self.assertEqual(c.precision, 10)
self.assertEqual(c.scale, 2)
c = curs.description[1]
self.assertEqual(c.name, 'hi')
self.assert_(c.type_code in psycopg2.STRING.values)
self.assert_(c.internal_size < 0)
self.assertEqual(c.precision, None)
self.assertEqual(c.scale, None)
c = curs.description[2]
self.assertEqual(c.name, 'now')
self.assert_(c.type_code in psycopg2.extensions.DATE.values)
self.assert_(c.internal_size > 0)
self.assertEqual(c.precision, None)
self.assertEqual(c.scale, None)
def test_pickle_description(self):
curs = self.conn.cursor()
curs.execute('SELECT 1 AS foo')
description = curs.description
pickled = pickle.dumps(description, pickle.HIGHEST_PROTOCOL)
unpickled = pickle.loads(pickled)
self.assertEqual(description, unpickled)
@skip_before_postgres(8, 0)
def test_named_cursor_stealing(self):
# you can use a named cursor to iterate on a refcursor created
# somewhere else
cur1 = self.conn.cursor()
cur1.execute("DECLARE test CURSOR WITHOUT HOLD "
" FOR SELECT generate_series(1,7)")
cur2 = self.conn.cursor('test')
# can call fetch without execute
self.assertEqual((1,), cur2.fetchone())
self.assertEqual([(2,), (3,), (4,)], cur2.fetchmany(3))
self.assertEqual([(5,), (6,), (7,)], cur2.fetchall())
@skip_before_postgres(8, 0)
def test_scroll(self):
cur = self.conn.cursor()
cur.execute("select generate_series(0,9)")
cur.scroll(2)
self.assertEqual(cur.fetchone(), (2,))
cur.scroll(2)
self.assertEqual(cur.fetchone(), (5,))
cur.scroll(2, mode='relative')
self.assertEqual(cur.fetchone(), (8,))
cur.scroll(-1)
self.assertEqual(cur.fetchone(), (8,))
cur.scroll(-2)
self.assertEqual(cur.fetchone(), (7,))
cur.scroll(2, mode='absolute')
self.assertEqual(cur.fetchone(), (2,))
# on the boundary
cur.scroll(0, mode='absolute')
self.assertEqual(cur.fetchone(), (0,))
self.assertRaises((IndexError, psycopg2.ProgrammingError),
cur.scroll, -1, mode='absolute')
cur.scroll(0, mode='absolute')
self.assertRaises((IndexError, psycopg2.ProgrammingError),
cur.scroll, -1)
cur.scroll(9, mode='absolute')
self.assertEqual(cur.fetchone(), (9,))
self.assertRaises((IndexError, psycopg2.ProgrammingError),
cur.scroll, 10, mode='absolute')
cur.scroll(9, mode='absolute')
self.assertRaises((IndexError, psycopg2.ProgrammingError),
cur.scroll, 1)
@skip_before_postgres(8, 0)
def test_scroll_named(self):
cur = self.conn.cursor('tmp', scrollable=True)
cur.execute("select generate_series(0,9)")
cur.scroll(2)
self.assertEqual(cur.fetchone(), (2,))
cur.scroll(2)
self.assertEqual(cur.fetchone(), (5,))
cur.scroll(2, mode='relative')
self.assertEqual(cur.fetchone(), (8,))
cur.scroll(9, mode='absolute')
self.assertEqual(cur.fetchone(), (9,))
def test_bad_subclass(self):
# check that we get an error message instead of a segfault
# for badly written subclasses.
# see http://stackoverflow.com/questions/22019341/
class StupidCursor(psycopg2.extensions.cursor):
def __init__(self, *args, **kwargs):
# I am stupid so not calling superclass init
pass
cur = StupidCursor()
self.assertRaises(psycopg2.InterfaceError, cur.execute, 'select 1')
self.assertRaises(psycopg2.InterfaceError, cur.executemany,
'select 1', [])
def test_callproc_badparam(self):
cur = self.conn.cursor()
self.assertRaises(TypeError, cur.callproc, 'lower', 42)
def test_suite():
return unittest.TestLoader().loadTestsFromName(__name__)
if __name__ == "__main__":
unittest.main()
|