import sqlite3 as sqlite
import unittest
@unittest.skipIf(sqlite.sqlite_version_info < (3, 6, 11), "Backup API not supported")
class BackupTests(unittest.TestCase):
def setUp(self):
cx = self.cx = sqlite.connect(":memory:")
cx.execute('CREATE TABLE foo (key INTEGER)')
cx.executemany('INSERT INTO foo (key) VALUES (?)', [(3,), (4,)])
cx.commit()
def tearDown(self):
self.cx.close()
def verify_backup(self, bckcx):
result = bckcx.execute("SELECT key FROM foo ORDER BY key").fetchall()
self.assertEqual(result[0][0], 3)
self.assertEqual(result[1][0], 4)
def test_bad_target_none(self):
with self.assertRaises(TypeError):
self.cx.backup(None)
def test_bad_target_filename(self):
with self.assertRaises(TypeError):
self.cx.backup('some_file_name.db')
def test_bad_target_same_connection(self):
with self.assertRaises(ValueError):
self.cx.backup(self.cx)
def test_bad_target_closed_connection(self):
bck = sqlite.connect(':memory:')
bck.close()
with self.assertRaises(sqlite.ProgrammingError):
self.cx.backup(bck)
def test_bad_source_closed_connection(self):
bck = sqlite.connect(':memory:')
source = sqlite.connect(":memory:")
source.close()
with self.assertRaises(sqlite.ProgrammingError):
source.backup(bck)
def test_bad_target_in_transaction(self):
bck = sqlite.connect(':memory:')
bck.execute('CREATE TABLE bar (key INTEGER)')
bck.executemany('INSERT INTO bar (key) VALUES (?)', [(3,), (4,)])
with self.assertRaises(sqlite.OperationalError) as cm:
self.cx.backup(bck)
if sqlite.sqlite_version_info < (3, 8, 8):
self.assertEqual(str(cm.exception), 'target is in transaction')
def test_keyword_only_args(self):
with self.assertRaises(TypeError):
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, 1)
def test_simple(self):
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck)
self.verify_backup(bck)
def test_progress(self):
journal = []
def progress(status, remaining, total):
journal.append(status)
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, pages=1, progress=progress)
self.verify_backup(bck)
self.assertEqual(len(journal), 2)
self.assertEqual(journal[0], sqlite.SQLITE_OK)
self.assertEqual(journal[1], sqlite.SQLITE_DONE)
def test_progress_all_pages_at_once_1(self):
journal = []
def progress(status, remaining, total):
journal.append(remaining)
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, progress=progress)
self.verify_backup(bck)
self.assertEqual(len(journal), 1)
self.assertEqual(journal[0], 0)
def test_progress_all_pages_at_once_2(self):
journal = []
def progress(status, remaining, total):
journal.append(remaining)
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, pages=-1, progress=progress)
self.verify_backup(bck)
self.assertEqual(len(journal), 1)
self.assertEqual(journal[0], 0)
def test_non_callable_progress(self):
with self.assertRaises(TypeError) as cm:
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, pages=1, progress='bar')
self.assertEqual(str(cm.exception), 'progress argument must be a callable')
def test_modifying_progress(self):
journal = []
def progress(status, remaining, total):
if not journal:
self.cx.execute('INSERT INTO foo (key) VALUES (?)', (remaining+1000,))
self.cx.commit()
journal.append(remaining)
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, pages=1, progress=progress)
self.verify_backup(bck)
result = bck.execute("SELECT key FROM foo"
" WHERE key >= 1000"
" ORDER BY key").fetchall()
self.assertEqual(result[0][0], 1001)
self.assertEqual(len(journal), 3)
self.assertEqual(journal[0], 1)
self.assertEqual(journal[1], 1)
self.assertEqual(journal[2], 0)
def test_failing_progress(self):
def progress(status, remaining, total):
raise SystemError('nearly out of space')
with self.assertRaises(SystemError) as err:
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, progress=progress)
self.assertEqual(str(err.exception), 'nearly out of space')
def test_database_source_name(self):
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, name='main')
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, name='temp')
with self.assertRaises(sqlite.OperationalError) as cm:
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, name='non-existing')
self.assertIn(
str(cm.exception),
['SQL logic error', 'SQL logic error or missing database',
'unknown database non-existing']
)
self.cx.execute("ATTACH DATABASE ':memory:' AS attached_db")
self.cx.execute('CREATE TABLE attached_db.foo (key INTEGER)')
self.cx.executemany('INSERT INTO attached_db.foo (key) VALUES (?)', [(3,), (4,)])
self.cx.commit()
with sqlite.connect(':memory:') as bck:
self.cx.backup(bck, name='attached_db')
self.verify_backup(bck)
def suite():
return unittest.makeSuite(BackupTests)
if __name__ == "__main__":
unittest.main()