#-*- coding: iso-8859-1 -*-
# pysqlite2/test/transactions.py: tests transactions
#
# Copyright (C) 2005-2007 Gerhard Hring <gh@ghaering.de>
#
# This file is part of pysqlite.
#
# This software is provided 'as-is', without any express or implied
# warranty. In no event will the authors be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.

import os, unittest
import sqlite3 as sqlite

def get_db_path():
 return "sqlite_testdb"

class TransactionTests(unittest.TestCase):
 def setUp(self):
 try:
 os.remove(get_db_path())
 except OSError:
 pass

 self.con1 = sqlite.connect(get_db_path(), timeout=0.1)
 self.cur1 = self.con1.cursor()

 self.con2 = sqlite.connect(get_db_path(), timeout=0.1)
 self.cur2 = self.con2.cursor()

 def tearDown(self):
 self.cur1.close()
 self.con1.close()

 self.cur2.close()
 self.con2.close()

 try:
 os.unlink(get_db_path())
 except OSError:
 pass

 def CheckDMLDoesNotAutoCommitBefore(self):
 self.cur1.execute("create table test(i)")
 self.cur1.execute("insert into test(i) values (5)")
 self.cur1.execute("create table test2(j)")
 self.cur2.execute("select i from test")
 res = self.cur2.fetchall()
 self.assertEqual(len(res), 0)

 def CheckInsertStartsTransaction(self):
 self.cur1.execute("create table test(i)")
 self.cur1.execute("insert into test(i) values (5)")
 self.cur2.execute("select i from test")
 res = self.cur2.fetchall()
 self.assertEqual(len(res), 0)

 def CheckUpdateStartsTransaction(self):
 self.cur1.execute("create table test(i)")
 self.cur1.execute("insert into test(i) values (5)")
 self.con1.commit()
 self.cur1.execute("update test set i=6")
 self.cur2.execute("select i from test")
 res = self.cur2.fetchone()[0]
 self.assertEqual(res, 5)

 def CheckDeleteStartsTransaction(self):
 self.cur1.execute("create table test(i)")
 self.cur1.execute("insert into test(i) values (5)")
 self.con1.commit()
 self.cur1.execute("delete from test")
 self.cur2.execute("select i from test")
 res = self.cur2.fetchall()
 self.assertEqual(len(res), 1)

 def CheckReplaceStartsTransaction(self):
 self.cur1.execute("create table test(i)")
 self.cur1.execute("insert into test(i) values (5)")
 self.con1.commit()
 self.cur1.execute("replace into test(i) values (6)")
 self.cur2.execute("select i from test")
 res = self.cur2.fetchall()
 self.assertEqual(len(res), 1)
 self.assertEqual(res[0][0], 5)

 def CheckToggleAutoCommit(self):
 self.cur1.execute("create table test(i)")
 self.cur1.execute("insert into test(i) values (5)")
 self.con1.isolation_level = None
 self.assertEqual(self.con1.isolation_level, None)
 self.cur2.execute("select i from test")
 res = self.cur2.fetchall()
 self.assertEqual(len(res), 1)

 self.con1.isolation_level = "DEFERRED"
 self.assertEqual(self.con1.isolation_level , "DEFERRED")
 self.cur1.execute("insert into test(i) values (5)")
 self.cur2.execute("select i from test")
 res = self.cur2.fetchall()
 self.assertEqual(len(res), 1)

 @unittest.skipIf(sqlite.sqlite_version_info < (3, 2, 2),
 'test hangs on sqlite versions older than 3.2.2')
 def CheckRaiseTimeout(self):
 self.cur1.execute("create table test(i)")
 self.cur1.execute("insert into test(i) values (5)")
 with self.assertRaises(sqlite.OperationalError):
 self.cur2.execute("insert into test(i) values (5)")

 @unittest.skipIf(sqlite.sqlite_version_info < (3, 2, 2),
 'test hangs on sqlite versions older than 3.2.2')
 def CheckLocking(self):
 """
 This tests the improved concurrency with pysqlite 2.3.4. You needed
 to roll back con2 before you could commit con1.
 """
 self.cur1.execute("create table test(i)")
 self.cur1.execute("insert into test(i) values (5)")
 with self.assertRaises(sqlite.OperationalError):
 self.cur2.execute("insert into test(i) values (5)")
 # NO self.con2.rollback() HERE!!!
 self.con1.commit()

 def CheckRollbackCursorConsistency(self):
 """
 Checks if cursors on the connection are set into a "reset" state
 when a rollback is done on the connection.
 """
 con = sqlite.connect(":memory:")
 cur = con.cursor()
 cur.execute("create table test(x)")
 cur.execute("insert into test(x) values (5)")
 cur.execute("select 1 union select 2 union select 3")

 con.rollback()
 with self.assertRaises(sqlite.InterfaceError):
 cur.fetchall()

class SpecialCommandTests(unittest.TestCase):
 def setUp(self):
 self.con = sqlite.connect(":memory:")
 self.cur = self.con.cursor()

 def CheckDropTable(self):
 self.cur.execute("create table test(i)")
 self.cur.execute("insert into test(i) values (5)")
 self.cur.execute("drop table test")

 def CheckPragma(self):
 self.cur.execute("create table test(i)")
 self.cur.execute("insert into test(i) values (5)")
 self.cur.execute("pragma count_changes=1")

 def tearDown(self):
 self.cur.close()
 self.con.close()

class TransactionalDDL(unittest.TestCase):
 def setUp(self):
 self.con = sqlite.connect(":memory:")

 def CheckDdlDoesNotAutostartTransaction(self):
 # For backwards compatibility reasons, DDL statements should not
 # implicitly start a transaction.
 self.con.execute("create table test(i)")
 self.con.rollback()
 result = self.con.execute("select * from test").fetchall()
 self.assertEqual(result, [])

 def CheckImmediateTransactionalDDL(self):
 # You can achieve transactional DDL by issuing a BEGIN
 # statement manually.
 self.con.execute("begin immediate")
 self.con.execute("create table test(i)")
 self.con.rollback()
 with self.assertRaises(sqlite.OperationalError):
 self.con.execute("select * from test")

 def CheckTransactionalDDL(self):
 # You can achieve transactional DDL by issuing a BEGIN
 # statement manually.
 self.con.execute("begin")
 self.con.execute("create table test(i)")
 self.con.rollback()
 with self.assertRaises(sqlite.OperationalError):
 self.con.execute("select * from test")

 def tearDown(self):
 self.con.close()

def suite():
 default_suite = unittest.makeSuite(TransactionTests, "Check")
 special_command_suite = unittest.makeSuite(SpecialCommandTests, "Check")
 ddl_suite = unittest.makeSuite(TransactionalDDL, "Check")
 return unittest.TestSuite((default_suite, special_command_suite, ddl_suite))

def test():
 runner = unittest.TextTestRunner()
 runner.run(suite())

if __name__ == "__main__":
 test()