mirror of
https://github.com/psycopg/psycopg2.git
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276 lines
9.0 KiB
Python
276 lines
9.0 KiB
Python
#!/usr/bin/env python
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#
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# extras_dictcursor - test if DictCursor extension class works
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#
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# Copyright (C) 2004-2010 Federico Di Gregorio <fog@debian.org>
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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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# 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 psycopg2
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import psycopg2.extras
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from testutils import unittest
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import tests
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class ExtrasDictCursorTests(unittest.TestCase):
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"""Test if DictCursor extension class works."""
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def setUp(self):
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self.conn = psycopg2.connect(tests.dsn)
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curs = self.conn.cursor()
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curs.execute("CREATE TEMPORARY TABLE ExtrasDictCursorTests (foo text)")
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curs.execute("INSERT INTO ExtrasDictCursorTests VALUES ('bar')")
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self.conn.commit()
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def tearDown(self):
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self.conn.close()
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def testDictCursorWithPlainCursorFetchOne(self):
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self._testWithPlainCursor(lambda curs: curs.fetchone())
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def testDictCursorWithPlainCursorFetchMany(self):
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self._testWithPlainCursor(lambda curs: curs.fetchmany(100)[0])
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def testDictCursorWithPlainCursorFetchAll(self):
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self._testWithPlainCursor(lambda curs: curs.fetchall()[0])
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def testDictCursorWithPlainCursorIter(self):
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def getter(curs):
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for row in curs:
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return row
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self._testWithPlainCursor(getter)
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def testDictCursorWithPlainCursorRealFetchOne(self):
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self._testWithPlainCursorReal(lambda curs: curs.fetchone())
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def testDictCursorWithPlainCursorRealFetchMany(self):
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self._testWithPlainCursorReal(lambda curs: curs.fetchmany(100)[0])
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def testDictCursorWithPlainCursorRealFetchAll(self):
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self._testWithPlainCursorReal(lambda curs: curs.fetchall()[0])
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def testDictCursorWithPlainCursorRealIter(self):
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def getter(curs):
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for row in curs:
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return row
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self._testWithPlainCursorReal(getter)
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def testDictCursorWithNamedCursorFetchOne(self):
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self._testWithNamedCursor(lambda curs: curs.fetchone())
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def testDictCursorWithNamedCursorFetchMany(self):
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self._testWithNamedCursor(lambda curs: curs.fetchmany(100)[0])
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def testDictCursorWithNamedCursorFetchAll(self):
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self._testWithNamedCursor(lambda curs: curs.fetchall()[0])
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def testDictCursorWithNamedCursorIter(self):
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def getter(curs):
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for row in curs:
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return row
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self._testWithNamedCursor(getter)
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def _testWithPlainCursor(self, getter):
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curs = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
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curs.execute("SELECT * FROM ExtrasDictCursorTests")
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row = getter(curs)
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self.failUnless(row['foo'] == 'bar')
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self.failUnless(row[0] == 'bar')
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def _testWithNamedCursor(self, getter):
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curs = self.conn.cursor('aname', cursor_factory=psycopg2.extras.DictCursor)
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curs.execute("SELECT * FROM ExtrasDictCursorTests")
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row = getter(curs)
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self.failUnless(row['foo'] == 'bar')
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self.failUnless(row[0] == 'bar')
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def _testWithPlainCursorReal(self, getter):
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curs = self.conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
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curs.execute("SELECT * FROM ExtrasDictCursorTests")
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row = getter(curs)
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self.failUnless(row['foo'] == 'bar')
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def _testWithNamedCursorReal(self, getter):
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curs = self.conn.cursor('aname', cursor_factory=psycopg2.extras.RealDictCursor)
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curs.execute("SELECT * FROM ExtrasDictCursorTests")
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row = getter(curs)
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self.failUnless(row['foo'] == 'bar')
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def if_has_namedtuple(f):
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def if_has_namedtuple_(self):
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try:
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from collections import namedtuple
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except ImportError:
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return self.skipTest("collections.namedtuple not available")
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else:
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return f(self)
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if_has_namedtuple_.__name__ = f.__name__
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return if_has_namedtuple_
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class NamedTupleCursorTest(unittest.TestCase):
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def setUp(self):
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from psycopg2.extras import NamedTupleConnection
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try:
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from collections import namedtuple
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except ImportError:
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self.conn = None
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return
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self.conn = psycopg2.connect(tests.dsn,
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connection_factory=NamedTupleConnection)
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curs = self.conn.cursor()
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curs.execute("CREATE TEMPORARY TABLE nttest (i int, s text)")
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curs.execute("INSERT INTO nttest VALUES (1, 'foo')")
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curs.execute("INSERT INTO nttest VALUES (2, 'bar')")
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curs.execute("INSERT INTO nttest VALUES (3, 'baz')")
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self.conn.commit()
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def tearDown(self):
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if self.conn is not None:
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self.conn.close()
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@if_has_namedtuple
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def test_fetchone(self):
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curs = self.conn.cursor()
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curs.execute("select * from nttest where i = 1")
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t = curs.fetchone()
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self.assertEqual(t[0], 1)
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self.assertEqual(t.i, 1)
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self.assertEqual(t[1], 'foo')
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self.assertEqual(t.s, 'foo')
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@if_has_namedtuple
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def test_fetchmany(self):
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curs = self.conn.cursor()
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curs.execute("select * from nttest order by 1")
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res = curs.fetchmany(2)
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self.assertEqual(2, len(res))
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self.assertEqual(res[0].i, 1)
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self.assertEqual(res[0].s, 'foo')
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self.assertEqual(res[1].i, 2)
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self.assertEqual(res[1].s, 'bar')
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@if_has_namedtuple
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def test_fetchall(self):
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curs = self.conn.cursor()
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curs.execute("select * from nttest order by 1")
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res = curs.fetchall()
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self.assertEqual(3, len(res))
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self.assertEqual(res[0].i, 1)
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self.assertEqual(res[0].s, 'foo')
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self.assertEqual(res[1].i, 2)
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self.assertEqual(res[1].s, 'bar')
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self.assertEqual(res[2].i, 3)
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self.assertEqual(res[2].s, 'baz')
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@if_has_namedtuple
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def test_iter(self):
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curs = self.conn.cursor()
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curs.execute("select * from nttest order by 1")
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i = iter(curs)
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t = i.next()
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self.assertEqual(t.i, 1)
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self.assertEqual(t.s, 'foo')
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t = i.next()
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self.assertEqual(t.i, 2)
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self.assertEqual(t.s, 'bar')
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t = i.next()
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self.assertEqual(t.i, 3)
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self.assertEqual(t.s, 'baz')
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self.assertRaises(StopIteration, i.next)
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def test_error_message(self):
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try:
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from collections import namedtuple
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except ImportError:
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# an import error somewhere
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from psycopg2.extras import NamedTupleConnection
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try:
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if self.conn is not None:
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self.conn.close()
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self.conn = psycopg2.connect(tests.dsn,
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connection_factory=NamedTupleConnection)
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curs = self.conn.cursor()
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curs.execute("select 1")
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curs.fetchone()
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except ImportError:
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pass
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else:
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self.fail("expecting ImportError")
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else:
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# skip the test
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pass
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@if_has_namedtuple
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def test_record_updated(self):
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curs = self.conn.cursor()
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curs.execute("select 1 as foo;")
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r = curs.fetchone()
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self.assertEqual(r.foo, 1)
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curs.execute("select 2 as bar;")
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r = curs.fetchone()
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self.assertEqual(r.bar, 2)
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self.assertRaises(AttributeError, getattr, r, 'foo')
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@if_has_namedtuple
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def test_no_result_no_surprise(self):
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curs = self.conn.cursor()
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curs.execute("update nttest set s = s")
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self.assertRaises(psycopg2.ProgrammingError, curs.fetchone)
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curs.execute("update nttest set s = s")
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self.assertRaises(psycopg2.ProgrammingError, curs.fetchall)
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@if_has_namedtuple
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def test_minimal_generation(self):
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# Instrument the class to verify it gets called the minimum number of times.
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from psycopg2.extras import NamedTupleCursor
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f_orig = NamedTupleCursor._make_nt
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calls = [0]
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def f_patched(self_):
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calls[0] += 1
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return f_orig(self_)
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NamedTupleCursor._make_nt = f_patched
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try:
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curs = self.conn.cursor()
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curs.execute("select * from nttest order by 1")
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curs.fetchone()
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curs.fetchone()
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curs.fetchone()
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self.assertEqual(1, calls[0])
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curs.execute("select * from nttest order by 1")
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curs.fetchone()
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curs.fetchall()
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self.assertEqual(2, calls[0])
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curs.execute("select * from nttest order by 1")
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curs.fetchone()
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curs.fetchmany(1)
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self.assertEqual(3, calls[0])
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finally:
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NamedTupleCursor._make_nt = f_orig
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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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