#-*- coding: ISO-8859-1 -*-

# pysqlite2/test/transactions.py: tests transactions

#

# Copyright (C) 2005-2007 Gerhard Häring <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 sys

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 CheckDMLdoesAutoCommitBefore(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.failUnlessEqual(len(res), 1)

    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.failUnlessEqual(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.failUnlessEqual(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.failUnlessEqual(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.failUnlessEqual(len(res), 1)

        self.failUnlessEqual(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.failUnlessEqual(self.con1.isolation_level, None)

        self.cur2.execute("select i from test")

        res = self.cur2.fetchall()

        self.failUnlessEqual(len(res), 1)

        self.con1.isolation_level = "DEFERRED"

        self.failUnlessEqual(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.failUnlessEqual(len(res), 1)

    def CheckRaiseTimeout(self):

        if sqlite.sqlite_version_info < (3, 2, 2):

            # This will fail (hang) on earlier versions of sqlite.

            # Determine exact version it was fixed. 3.2.1 hangs.

            return

        self.cur1.execute("create table test(i)")

        self.cur1.execute("insert into test(i) values (5)")

        try:

            self.cur2.execute("insert into test(i) values (5)")

            self.fail("should have raised an OperationalError")

        except sqlite.OperationalError:

            pass

        except:

            self.fail("should have raised an OperationalError")

    def CheckLocking(self):

        """

        This tests the improved concurrency with pysqlite 2.3.4. You needed

        to roll back con2 before you could commit con1.

        """

        if sqlite.sqlite_version_info < (3, 2, 2):

            # This will fail (hang) on earlier versions of sqlite.

            # Determine exact version it was fixed. 3.2.1 hangs.

            return

        self.cur1.execute("create table test(i)")

        self.cur1.execute("insert into test(i) values (5)")

        try:

            self.cur2.execute("insert into test(i) values (5)")

            self.fail("should have raised an OperationalError")

        except sqlite.OperationalError:

            pass

        except:

            self.fail("should have raised an OperationalError")

        # NO self.con2.rollback() HERE!!!

        self.con1.commit()

class SpecialCommandTests(unittest.TestCase):

    def setUp(self):

        self.con = sqlite.connect(":memory:")

        self.cur = self.con.cursor()

    def CheckVacuum(self):

        self.cur.execute("create table test(i)")

        self.cur.execute("insert into test(i) values (5)")

        self.cur.execute("vacuum")

    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()

def suite():

    default_suite = unittest.makeSuite(TransactionTests, "Check")

    special_command_suite = unittest.makeSuite(SpecialCommandTests, "Check")

    return unittest.TestSuite((default_suite, special_command_suite))

def test():

    runner = unittest.TextTestRunner()

    runner.run(suite())

if __name__ == "__main__":

    test()