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psycopg2/tests/test_extras_dictcursor.py
Daniele Varrazzo 35ec7ad9c1 Use a proper LRU cache for namedtuples 
Previous one didn't refresh by last use. Use the stdlib version for py3
and one of our own for py2.

Max size set to 512, which should be fine for everyone (tweaking is
still possible by monkeypatching, as the tests do, but I don't want to
make an interface of it).
2019-02-02 19:29:20 +00:00

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#!/usr/bin/env python
#
# extras_dictcursor - test if DictCursor extension class works
#
# Copyright (C) 2004-2010 Federico Di Gregorio <fog@debian.org>
#
# 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.
#
# 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
from datetime import timedelta
import psycopg2
import psycopg2.extras
import unittest
from .testutils import ConnectingTestCase, skip_before_postgres, \
skip_before_python, skip_from_python
class _DictCursorBase(ConnectingTestCase):
def setUp(self):
ConnectingTestCase.setUp(self)
curs = self.conn.cursor()
curs.execute("CREATE TEMPORARY TABLE ExtrasDictCursorTests (foo text)")
curs.execute("INSERT INTO ExtrasDictCursorTests VALUES ('bar')")
self.conn.commit()
def _testIterRowNumber(self, curs):
# Only checking for dataset < itersize:
# see CursorTests.test_iter_named_cursor_rownumber
curs.itersize = 20
curs.execute("""select * from generate_series(1,10)""")
for i, r in enumerate(curs):
self.assertEqual(i + 1, curs.rownumber)
def _testNamedCursorNotGreedy(self, curs):
curs.itersize = 2
curs.execute("""select clock_timestamp() as ts from generate_series(1,3)""")
recs = []
for t in curs:
time.sleep(0.01)
recs.append(t)
# check that the dataset was not fetched in a single gulp
self.assert_(recs[1]['ts'] - recs[0]['ts'] < timedelta(seconds=0.005))
self.assert_(recs[2]['ts'] - recs[1]['ts'] > timedelta(seconds=0.0099))
class ExtrasDictCursorTests(_DictCursorBase):
"""Test if DictCursor extension class works."""
def testDictConnCursorArgs(self):
self.conn.close()
self.conn = self.connect(connection_factory=psycopg2.extras.DictConnection)
cur = self.conn.cursor()
self.assert_(isinstance(cur, psycopg2.extras.DictCursor))
self.assertEqual(cur.name, None)
# overridable
cur = self.conn.cursor('foo',
cursor_factory=psycopg2.extras.NamedTupleCursor)
self.assertEqual(cur.name, 'foo')
self.assert_(isinstance(cur, psycopg2.extras.NamedTupleCursor))
def testDictCursorWithPlainCursorFetchOne(self):
self._testWithPlainCursor(lambda curs: curs.fetchone())
def testDictCursorWithPlainCursorFetchMany(self):
self._testWithPlainCursor(lambda curs: curs.fetchmany(100)[0])
def testDictCursorWithPlainCursorFetchManyNoarg(self):
self._testWithPlainCursor(lambda curs: curs.fetchmany()[0])
def testDictCursorWithPlainCursorFetchAll(self):
self._testWithPlainCursor(lambda curs: curs.fetchall()[0])
def testDictCursorWithPlainCursorIter(self):
def getter(curs):
for row in curs:
return row
self._testWithPlainCursor(getter)
def testUpdateRow(self):
row = self._testWithPlainCursor(lambda curs: curs.fetchone())
row['foo'] = 'qux'
self.failUnless(row['foo'] == 'qux')
self.failUnless(row[0] == 'qux')
@skip_before_postgres(8, 0)
def testDictCursorWithPlainCursorIterRowNumber(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
self._testIterRowNumber(curs)
def _testWithPlainCursor(self, getter):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
curs.execute("SELECT * FROM ExtrasDictCursorTests")
row = getter(curs)
self.failUnless(row['foo'] == 'bar')
self.failUnless(row[0] == 'bar')
return row
def testDictCursorWithNamedCursorFetchOne(self):
self._testWithNamedCursor(lambda curs: curs.fetchone())
def testDictCursorWithNamedCursorFetchMany(self):
self._testWithNamedCursor(lambda curs: curs.fetchmany(100)[0])
def testDictCursorWithNamedCursorFetchManyNoarg(self):
self._testWithNamedCursor(lambda curs: curs.fetchmany()[0])
def testDictCursorWithNamedCursorFetchAll(self):
self._testWithNamedCursor(lambda curs: curs.fetchall()[0])
def testDictCursorWithNamedCursorIter(self):
def getter(curs):
for row in curs:
return row
self._testWithNamedCursor(getter)
@skip_before_postgres(8, 2)
def testDictCursorWithNamedCursorNotGreedy(self):
curs = self.conn.cursor('tmp', cursor_factory=psycopg2.extras.DictCursor)
self._testNamedCursorNotGreedy(curs)
@skip_before_postgres(8, 0)
def testDictCursorWithNamedCursorIterRowNumber(self):
curs = self.conn.cursor('tmp', cursor_factory=psycopg2.extras.DictCursor)
self._testIterRowNumber(curs)
def _testWithNamedCursor(self, getter):
curs = self.conn.cursor('aname', cursor_factory=psycopg2.extras.DictCursor)
curs.execute("SELECT * FROM ExtrasDictCursorTests")
row = getter(curs)
self.failUnless(row['foo'] == 'bar')
self.failUnless(row[0] == 'bar')
def testPickleDictRow(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
curs.execute("select 10 as a, 20 as b")
r = curs.fetchone()
d = pickle.dumps(r)
r1 = pickle.loads(d)
self.assertEqual(r, r1)
self.assertEqual(r[0], r1[0])
self.assertEqual(r[1], r1[1])
self.assertEqual(r['a'], r1['a'])
self.assertEqual(r['b'], r1['b'])
self.assertEqual(r._index, r1._index)
@skip_from_python(3)
def test_iter_methods_2(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
curs.execute("select 10 as a, 20 as b")
r = curs.fetchone()
self.assert_(isinstance(r.keys(), list))
self.assertEqual(len(r.keys()), 2)
self.assert_(isinstance(r.values(), tuple)) # sic?
self.assertEqual(len(r.values()), 2)
self.assert_(isinstance(r.items(), list))
self.assertEqual(len(r.items()), 2)
self.assert_(not isinstance(r.iterkeys(), list))
self.assertEqual(len(list(r.iterkeys())), 2)
self.assert_(not isinstance(r.itervalues(), list))
self.assertEqual(len(list(r.itervalues())), 2)
self.assert_(not isinstance(r.iteritems(), list))
self.assertEqual(len(list(r.iteritems())), 2)
@skip_before_python(3)
def test_iter_methods_3(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
curs.execute("select 10 as a, 20 as b")
r = curs.fetchone()
self.assert_(not isinstance(r.keys(), list))
self.assertEqual(len(list(r.keys())), 2)
self.assert_(not isinstance(r.values(), list))
self.assertEqual(len(list(r.values())), 2)
self.assert_(not isinstance(r.items(), list))
self.assertEqual(len(list(r.items())), 2)
def test_order(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
curs.execute("select 5 as foo, 4 as bar, 33 as baz, 2 as qux")
r = curs.fetchone()
self.assertEqual(list(r), [5, 4, 33, 2])
self.assertEqual(list(r.keys()), ['foo', 'bar', 'baz', 'qux'])
self.assertEqual(list(r.values()), [5, 4, 33, 2])
self.assertEqual(list(r.items()),
[('foo', 5), ('bar', 4), ('baz', 33), ('qux', 2)])
r1 = pickle.loads(pickle.dumps(r))
self.assertEqual(list(r1), list(r))
self.assertEqual(list(r1.keys()), list(r.keys()))
self.assertEqual(list(r1.values()), list(r.values()))
self.assertEqual(list(r1.items()), list(r.items()))
@skip_from_python(3)
def test_order_iter(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
curs.execute("select 5 as foo, 4 as bar, 33 as baz, 2 as qux")
r = curs.fetchone()
self.assertEqual(list(r.iterkeys()), ['foo', 'bar', 'baz', 'qux'])
self.assertEqual(list(r.itervalues()), [5, 4, 33, 2])
self.assertEqual(list(r.iteritems()),
[('foo', 5), ('bar', 4), ('baz', 33), ('qux', 2)])
r1 = pickle.loads(pickle.dumps(r))
self.assertEqual(list(r1.iterkeys()), list(r.iterkeys()))
self.assertEqual(list(r1.itervalues()), list(r.itervalues()))
self.assertEqual(list(r1.iteritems()), list(r.iteritems()))
class ExtrasDictCursorRealTests(_DictCursorBase):
def testDictCursorWithPlainCursorRealFetchOne(self):
self._testWithPlainCursorReal(lambda curs: curs.fetchone())
def testDictCursorWithPlainCursorRealFetchMany(self):
self._testWithPlainCursorReal(lambda curs: curs.fetchmany(100)[0])
def testDictCursorWithPlainCursorRealFetchManyNoarg(self):
self._testWithPlainCursorReal(lambda curs: curs.fetchmany()[0])
def testDictCursorWithPlainCursorRealFetchAll(self):
self._testWithPlainCursorReal(lambda curs: curs.fetchall()[0])
def testDictCursorWithPlainCursorRealIter(self):
def getter(curs):
for row in curs:
return row
self._testWithPlainCursorReal(getter)
@skip_before_postgres(8, 0)
def testDictCursorWithPlainCursorRealIterRowNumber(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
self._testIterRowNumber(curs)
def _testWithPlainCursorReal(self, getter):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
curs.execute("SELECT * FROM ExtrasDictCursorTests")
row = getter(curs)
self.failUnless(row['foo'] == 'bar')
def testPickleRealDictRow(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
curs.execute("select 10 as a, 20 as b")
r = curs.fetchone()
d = pickle.dumps(r)
r1 = pickle.loads(d)
self.assertEqual(r, r1)
self.assertEqual(r['a'], r1['a'])
self.assertEqual(r['b'], r1['b'])
self.assertEqual(r._column_mapping, r1._column_mapping)
def testDictCursorRealWithNamedCursorFetchOne(self):
self._testWithNamedCursorReal(lambda curs: curs.fetchone())
def testDictCursorRealWithNamedCursorFetchMany(self):
self._testWithNamedCursorReal(lambda curs: curs.fetchmany(100)[0])
def testDictCursorRealWithNamedCursorFetchManyNoarg(self):
self._testWithNamedCursorReal(lambda curs: curs.fetchmany()[0])
def testDictCursorRealWithNamedCursorFetchAll(self):
self._testWithNamedCursorReal(lambda curs: curs.fetchall()[0])
def testDictCursorRealWithNamedCursorIter(self):
def getter(curs):
for row in curs:
return row
self._testWithNamedCursorReal(getter)
@skip_before_postgres(8, 2)
def testDictCursorRealWithNamedCursorNotGreedy(self):
curs = self.conn.cursor('tmp', cursor_factory=psycopg2.extras.RealDictCursor)
self._testNamedCursorNotGreedy(curs)
@skip_before_postgres(8, 0)
def testDictCursorRealWithNamedCursorIterRowNumber(self):
curs = self.conn.cursor('tmp', cursor_factory=psycopg2.extras.RealDictCursor)
self._testIterRowNumber(curs)
def _testWithNamedCursorReal(self, getter):
curs = self.conn.cursor('aname',
cursor_factory=psycopg2.extras.RealDictCursor)
curs.execute("SELECT * FROM ExtrasDictCursorTests")
row = getter(curs)
self.failUnless(row['foo'] == 'bar')
@skip_from_python(3)
def test_iter_methods_2(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
curs.execute("select 10 as a, 20 as b")
r = curs.fetchone()
self.assert_(isinstance(r.keys(), list))
self.assertEqual(len(r.keys()), 2)
self.assert_(isinstance(r.values(), list))
self.assertEqual(len(r.values()), 2)
self.assert_(isinstance(r.items(), list))
self.assertEqual(len(r.items()), 2)
self.assert_(not isinstance(r.iterkeys(), list))
self.assertEqual(len(list(r.iterkeys())), 2)
self.assert_(not isinstance(r.itervalues(), list))
self.assertEqual(len(list(r.itervalues())), 2)
self.assert_(not isinstance(r.iteritems(), list))
self.assertEqual(len(list(r.iteritems())), 2)
@skip_before_python(3)
def test_iter_methods_3(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
curs.execute("select 10 as a, 20 as b")
r = curs.fetchone()
self.assert_(not isinstance(r.keys(), list))
self.assertEqual(len(list(r.keys())), 2)
self.assert_(not isinstance(r.values(), list))
self.assertEqual(len(list(r.values())), 2)
self.assert_(not isinstance(r.items(), list))
self.assertEqual(len(list(r.items())), 2)
def test_order(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
curs.execute("select 5 as foo, 4 as bar, 33 as baz, 2 as qux")
r = curs.fetchone()
self.assertEqual(list(r), ['foo', 'bar', 'baz', 'qux'])
self.assertEqual(list(r.keys()), ['foo', 'bar', 'baz', 'qux'])
self.assertEqual(list(r.values()), [5, 4, 33, 2])
self.assertEqual(list(r.items()),
[('foo', 5), ('bar', 4), ('baz', 33), ('qux', 2)])
r1 = pickle.loads(pickle.dumps(r))
self.assertEqual(list(r1), list(r))
self.assertEqual(list(r1.keys()), list(r.keys()))
self.assertEqual(list(r1.values()), list(r.values()))
self.assertEqual(list(r1.items()), list(r.items()))
@skip_from_python(3)
def test_order_iter(self):
curs = self.conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
curs.execute("select 5 as foo, 4 as bar, 33 as baz, 2 as qux")
r = curs.fetchone()
self.assertEqual(list(r.iterkeys()), ['foo', 'bar', 'baz', 'qux'])
self.assertEqual(list(r.itervalues()), [5, 4, 33, 2])
self.assertEqual(list(r.iteritems()),
[('foo', 5), ('bar', 4), ('baz', 33), ('qux', 2)])
r1 = pickle.loads(pickle.dumps(r))
self.assertEqual(list(r1.iterkeys()), list(r.iterkeys()))
self.assertEqual(list(r1.itervalues()), list(r.itervalues()))
self.assertEqual(list(r1.iteritems()), list(r.iteritems()))
class NamedTupleCursorTest(ConnectingTestCase):
def setUp(self):
ConnectingTestCase.setUp(self)
from psycopg2.extras import NamedTupleConnection
self.conn = self.connect(connection_factory=NamedTupleConnection)
curs = self.conn.cursor()
curs.execute("CREATE TEMPORARY TABLE nttest (i int, s text)")
curs.execute("INSERT INTO nttest VALUES (1, 'foo')")
curs.execute("INSERT INTO nttest VALUES (2, 'bar')")
curs.execute("INSERT INTO nttest VALUES (3, 'baz')")
self.conn.commit()
def test_cursor_args(self):
cur = self.conn.cursor('foo', cursor_factory=psycopg2.extras.DictCursor)
self.assertEqual(cur.name, 'foo')
self.assert_(isinstance(cur, psycopg2.extras.DictCursor))
def test_fetchone(self):
curs = self.conn.cursor()
curs.execute("select * from nttest order by 1")
t = curs.fetchone()
self.assertEqual(t[0], 1)
self.assertEqual(t.i, 1)
self.assertEqual(t[1], 'foo')
self.assertEqual(t.s, 'foo')
self.assertEqual(curs.rownumber, 1)
self.assertEqual(curs.rowcount, 3)
def test_fetchmany_noarg(self):
curs = self.conn.cursor()
curs.arraysize = 2
curs.execute("select * from nttest order by 1")
res = curs.fetchmany()
self.assertEqual(2, len(res))
self.assertEqual(res[0].i, 1)
self.assertEqual(res[0].s, 'foo')
self.assertEqual(res[1].i, 2)
self.assertEqual(res[1].s, 'bar')
self.assertEqual(curs.rownumber, 2)
self.assertEqual(curs.rowcount, 3)
def test_fetchmany(self):
curs = self.conn.cursor()
curs.execute("select * from nttest order by 1")
res = curs.fetchmany(2)
self.assertEqual(2, len(res))
self.assertEqual(res[0].i, 1)
self.assertEqual(res[0].s, 'foo')
self.assertEqual(res[1].i, 2)
self.assertEqual(res[1].s, 'bar')
self.assertEqual(curs.rownumber, 2)
self.assertEqual(curs.rowcount, 3)
def test_fetchall(self):
curs = self.conn.cursor()
curs.execute("select * from nttest order by 1")
res = curs.fetchall()
self.assertEqual(3, len(res))
self.assertEqual(res[0].i, 1)
self.assertEqual(res[0].s, 'foo')
self.assertEqual(res[1].i, 2)
self.assertEqual(res[1].s, 'bar')
self.assertEqual(res[2].i, 3)
self.assertEqual(res[2].s, 'baz')
self.assertEqual(curs.rownumber, 3)
self.assertEqual(curs.rowcount, 3)
def test_executemany(self):
curs = self.conn.cursor()
curs.executemany("delete from nttest where i = %s",
[(1,), (2,)])
curs.execute("select * from nttest order by 1")
res = curs.fetchall()
self.assertEqual(1, len(res))
self.assertEqual(res[0].i, 3)
self.assertEqual(res[0].s, 'baz')
def test_iter(self):
curs = self.conn.cursor()
curs.execute("select * from nttest order by 1")
i = iter(curs)
self.assertEqual(curs.rownumber, 0)
t = next(i)
self.assertEqual(t.i, 1)
self.assertEqual(t.s, 'foo')
self.assertEqual(curs.rownumber, 1)
self.assertEqual(curs.rowcount, 3)
t = next(i)
self.assertEqual(t.i, 2)
self.assertEqual(t.s, 'bar')
self.assertEqual(curs.rownumber, 2)
self.assertEqual(curs.rowcount, 3)
t = next(i)
self.assertEqual(t.i, 3)
self.assertEqual(t.s, 'baz')
self.assertRaises(StopIteration, next, i)
self.assertEqual(curs.rownumber, 3)
self.assertEqual(curs.rowcount, 3)
def test_record_updated(self):
curs = self.conn.cursor()
curs.execute("select 1 as foo;")
r = curs.fetchone()
self.assertEqual(r.foo, 1)
curs.execute("select 2 as bar;")
r = curs.fetchone()
self.assertEqual(r.bar, 2)
self.assertRaises(AttributeError, getattr, r, 'foo')
def test_no_result_no_surprise(self):
curs = self.conn.cursor()
curs.execute("update nttest set s = s")
self.assertRaises(psycopg2.ProgrammingError, curs.fetchone)
curs.execute("update nttest set s = s")
self.assertRaises(psycopg2.ProgrammingError, curs.fetchall)
def test_bad_col_names(self):
curs = self.conn.cursor()
curs.execute('select 1 as "foo.bar_baz", 2 as "?column?", 3 as "3"')
rv = curs.fetchone()
self.assertEqual(rv.foo_bar_baz, 1)
self.assertEqual(rv.f_column_, 2)
self.assertEqual(rv.f3, 3)
@skip_before_python(3)
@skip_before_postgres(8)
def test_nonascii_name(self):
curs = self.conn.cursor()
curs.execute('select 1 as \xe5h\xe9')
rv = curs.fetchone()
self.assertEqual(getattr(rv, '\xe5h\xe9'), 1)
def test_minimal_generation(self):
# Instrument the class to verify it gets called the minimum number of times.
from psycopg2.extras import NamedTupleCursor
f_orig = NamedTupleCursor._make_nt
calls = [0]
def f_patched(self_):
calls[0] += 1
return f_orig(self_)
NamedTupleCursor._make_nt = f_patched
try:
curs = self.conn.cursor()
curs.execute("select * from nttest order by 1")
curs.fetchone()
curs.fetchone()
curs.fetchone()
self.assertEqual(1, calls[0])
curs.execute("select * from nttest order by 1")
curs.fetchone()
curs.fetchall()
self.assertEqual(2, calls[0])
curs.execute("select * from nttest order by 1")
curs.fetchone()
curs.fetchmany(1)
self.assertEqual(3, calls[0])
finally:
NamedTupleCursor._make_nt = f_orig
@skip_before_postgres(8, 0)
def test_named(self):
curs = self.conn.cursor('tmp')
curs.execute("""select i from generate_series(0,9) i""")
recs = []
recs.extend(curs.fetchmany(5))
recs.append(curs.fetchone())
recs.extend(curs.fetchall())
self.assertEqual(list(range(10)), [t.i for t in recs])
def test_named_fetchone(self):
curs = self.conn.cursor('tmp')
curs.execute("""select 42 as i""")
t = curs.fetchone()
self.assertEqual(t.i, 42)
def test_named_fetchmany(self):
curs = self.conn.cursor('tmp')
curs.execute("""select 42 as i""")
recs = curs.fetchmany(10)
self.assertEqual(recs[0].i, 42)
def test_named_fetchall(self):
curs = self.conn.cursor('tmp')
curs.execute("""select 42 as i""")
recs = curs.fetchall()
self.assertEqual(recs[0].i, 42)
@skip_before_postgres(8, 2)
def test_not_greedy(self):
curs = self.conn.cursor('tmp')
curs.itersize = 2
curs.execute("""select clock_timestamp() as ts from generate_series(1,3)""")
recs = []
for t in curs:
time.sleep(0.01)
recs.append(t)
# check that the dataset was not fetched in a single gulp
self.assert_(recs[1].ts - recs[0].ts < timedelta(seconds=0.005))
self.assert_(recs[2].ts - recs[1].ts > timedelta(seconds=0.0099))
@skip_before_postgres(8, 0)
def test_named_rownumber(self):
curs = self.conn.cursor('tmp')
# Only checking for dataset < itersize:
# see CursorTests.test_iter_named_cursor_rownumber
curs.itersize = 4
curs.execute("""select * from generate_series(1,3)""")
for i, t in enumerate(curs):
self.assertEqual(i + 1, curs.rownumber)
def test_cache(self):
curs = self.conn.cursor()
curs.execute("select 10 as a, 20 as b")
r1 = curs.fetchone()
curs.execute("select 10 as a, 20 as c")
r2 = curs.fetchone()
curs.execute("select 10 as a, 30 as b")
r3 = curs.fetchone()
self.assert_(type(r1) is type(r3))
self.assert_(type(r1) is not type(r2))
def test_max_cache(self):
from psycopg2.extras import NamedTupleCursor
from psycopg2.compat import lru_cache
old_func = NamedTupleCursor._cached_make_nt
NamedTupleCursor._cached_make_nt = \
lru_cache(8)(NamedTupleCursor._do_make_nt)
try:
recs = []
curs = self.conn.cursor()
for i in range(10):
curs.execute("select 1 as f%s" % i)
recs.append(curs.fetchone())
# Still in cache
curs.execute("select 1 as f9")
rec = curs.fetchone()
self.assert_(any(type(r) is type(rec) for r in recs))
# Gone from cache
curs.execute("select 1 as f0")
rec = curs.fetchone()
self.assert_(all(type(r) is not type(rec) for r in recs))
finally:
NamedTupleCursor._cached_make_nt = old_func
def test_suite():
return unittest.TestLoader().loadTestsFromName(__name__)
if __name__ == "__main__":
unittest.main()
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