/Lib/sqlite3/test/transactions.py

  1#-*- coding: ISO-8859-1 -*-
  2# pysqlite2/test/transactions.py: tests transactions
  3#
  4# Copyright (C) 2005-2007 Gerhard Häring <gh@ghaering.de>
  5#
  6# This file is part of pysqlite.
  7#
  8# This software is provided 'as-is', without any express or implied
  9# warranty.  In no event will the authors be held liable for any damages
 10# arising from the use of this software.
 11#
 12# Permission is granted to anyone to use this software for any purpose,
 13# including commercial applications, and to alter it and redistribute it
 14# freely, subject to the following restrictions:
 15#
 16# 1. The origin of this software must not be misrepresented; you must not
 17#    claim that you wrote the original software. If you use this software
 18#    in a product, an acknowledgment in the product documentation would be
 19#    appreciated but is not required.
 20# 2. Altered source versions must be plainly marked as such, and must not be
 21#    misrepresented as being the original software.
 22# 3. This notice may not be removed or altered from any source distribution.
 23
 24import sys
 25import os, unittest
 26import sqlite3 as sqlite
 27
 28def get_db_path():
 29    return "sqlite_testdb"
 30
 31class TransactionTests(unittest.TestCase):
 32    def setUp(self):
 33        try:
 34            os.remove(get_db_path())
 35        except OSError:
 36            pass
 37
 38        self.con1 = sqlite.connect(get_db_path(), timeout=0.1)
 39        self.cur1 = self.con1.cursor()
 40
 41        self.con2 = sqlite.connect(get_db_path(), timeout=0.1)
 42        self.cur2 = self.con2.cursor()
 43
 44    def tearDown(self):
 45        self.cur1.close()
 46        self.con1.close()
 47
 48        self.cur2.close()
 49        self.con2.close()
 50
 51        try:
 52            os.unlink(get_db_path())
 53        except OSError:
 54            pass
 55
 56    def CheckDMLdoesAutoCommitBefore(self):
 57        self.cur1.execute("create table test(i)")
 58        self.cur1.execute("insert into test(i) values (5)")
 59        self.cur1.execute("create table test2(j)")
 60        self.cur2.execute("select i from test")
 61        res = self.cur2.fetchall()
 62        self.failUnlessEqual(len(res), 1)
 63
 64    def CheckInsertStartsTransaction(self):
 65        self.cur1.execute("create table test(i)")
 66        self.cur1.execute("insert into test(i) values (5)")
 67        self.cur2.execute("select i from test")
 68        res = self.cur2.fetchall()
 69        self.failUnlessEqual(len(res), 0)
 70
 71    def CheckUpdateStartsTransaction(self):
 72        self.cur1.execute("create table test(i)")
 73        self.cur1.execute("insert into test(i) values (5)")
 74        self.con1.commit()
 75        self.cur1.execute("update test set i=6")
 76        self.cur2.execute("select i from test")
 77        res = self.cur2.fetchone()[0]
 78        self.failUnlessEqual(res, 5)
 79
 80    def CheckDeleteStartsTransaction(self):
 81        self.cur1.execute("create table test(i)")
 82        self.cur1.execute("insert into test(i) values (5)")
 83        self.con1.commit()
 84        self.cur1.execute("delete from test")
 85        self.cur2.execute("select i from test")
 86        res = self.cur2.fetchall()
 87        self.failUnlessEqual(len(res), 1)
 88
 89    def CheckReplaceStartsTransaction(self):
 90        self.cur1.execute("create table test(i)")
 91        self.cur1.execute("insert into test(i) values (5)")
 92        self.con1.commit()
 93        self.cur1.execute("replace into test(i) values (6)")
 94        self.cur2.execute("select i from test")
 95        res = self.cur2.fetchall()
 96        self.failUnlessEqual(len(res), 1)
 97        self.failUnlessEqual(res[0][0], 5)
 98
 99    def CheckToggleAutoCommit(self):
100        self.cur1.execute("create table test(i)")
101        self.cur1.execute("insert into test(i) values (5)")
102        self.con1.isolation_level = None
103        self.failUnlessEqual(self.con1.isolation_level, None)
104        self.cur2.execute("select i from test")
105        res = self.cur2.fetchall()
106        self.failUnlessEqual(len(res), 1)
107
108        self.con1.isolation_level = "DEFERRED"
109        self.failUnlessEqual(self.con1.isolation_level , "DEFERRED")
110        self.cur1.execute("insert into test(i) values (5)")
111        self.cur2.execute("select i from test")
112        res = self.cur2.fetchall()
113        self.failUnlessEqual(len(res), 1)
114
115    def CheckRaiseTimeout(self):
116        if sqlite.sqlite_version_info < (3, 2, 2):
117            # This will fail (hang) on earlier versions of sqlite.
118            # Determine exact version it was fixed. 3.2.1 hangs.
119            return
120        self.cur1.execute("create table test(i)")
121        self.cur1.execute("insert into test(i) values (5)")
122        try:
123            self.cur2.execute("insert into test(i) values (5)")
124            self.fail("should have raised an OperationalError")
125        except sqlite.OperationalError:
126            pass
127        except:
128            self.fail("should have raised an OperationalError")
129
130    def CheckLocking(self):
131        """
132        This tests the improved concurrency with pysqlite 2.3.4. You needed
133        to roll back con2 before you could commit con1.
134        """
135        if sqlite.sqlite_version_info < (3, 2, 2):
136            # This will fail (hang) on earlier versions of sqlite.
137            # Determine exact version it was fixed. 3.2.1 hangs.
138            return
139        self.cur1.execute("create table test(i)")
140        self.cur1.execute("insert into test(i) values (5)")
141        try:
142            self.cur2.execute("insert into test(i) values (5)")
143            self.fail("should have raised an OperationalError")
144        except sqlite.OperationalError:
145            pass
146        except:
147            self.fail("should have raised an OperationalError")
148        # NO self.con2.rollback() HERE!!!
149        self.con1.commit()
150
151class SpecialCommandTests(unittest.TestCase):
152    def setUp(self):
153        self.con = sqlite.connect(":memory:")
154        self.cur = self.con.cursor()
155
156    def CheckVacuum(self):
157        self.cur.execute("create table test(i)")
158        self.cur.execute("insert into test(i) values (5)")
159        self.cur.execute("vacuum")
160
161    def CheckDropTable(self):
162        self.cur.execute("create table test(i)")
163        self.cur.execute("insert into test(i) values (5)")
164        self.cur.execute("drop table test")
165
166    def CheckPragma(self):
167        self.cur.execute("create table test(i)")
168        self.cur.execute("insert into test(i) values (5)")
169        self.cur.execute("pragma count_changes=1")
170
171    def tearDown(self):
172        self.cur.close()
173        self.con.close()
174
175def suite():
176    default_suite = unittest.makeSuite(TransactionTests, "Check")
177    special_command_suite = unittest.makeSuite(SpecialCommandTests, "Check")
178    return unittest.TestSuite((default_suite, special_command_suite))
179
180def test():
181    runner = unittest.TextTestRunner()
182    runner.run(suite())
183
184if __name__ == "__main__":
185    test()