# pysqlite2/test/transactions.py: tests transactions # # Copyright (C) 2005-2007 Gerhard Häring # # 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 from .test_dbapi import memory_database 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 test_dml_does_not_auto_commit_before(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 test_insert_starts_transaction(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 test_update_starts_transaction(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 test_delete_starts_transaction(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 test_replace_starts_transaction(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 test_toggle_auto_commit(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) def test_raise_timeout(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)") def test_locking(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 test_rollback_cursor_consistency(self): """Check that cursors behave correctly after rollback.""" 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() self.assertEqual(cur.fetchall(), [(1,), (2,), (3,)]) class RollbackTests(unittest.TestCase): """bpo-44092: sqlite3 now leaves it to SQLite to resolve rollback issues""" def setUp(self): self.con = sqlite.connect(":memory:") self.cur1 = self.con.cursor() self.cur2 = self.con.cursor() with self.con: self.con.execute("create table t(c)"); self.con.executemany("insert into t values(?)", [(0,), (1,), (2,)]) self.cur1.execute("begin transaction") select = "select c from t" self.cur1.execute(select) self.con.rollback() self.res = self.cur2.execute(select) # Reusing stmt from cache def tearDown(self): self.con.close() def _check_rows(self): for i, row in enumerate(self.res): self.assertEqual(row[0], i) def test_no_duplicate_rows_after_rollback_del_cursor(self): del self.cur1 self._check_rows() def test_no_duplicate_rows_after_rollback_close_cursor(self): self.cur1.close() self._check_rows() def test_no_duplicate_rows_after_rollback_new_query(self): self.cur1.execute("select c from t where c = 1") self._check_rows() class SpecialCommandTests(unittest.TestCase): def setUp(self): self.con = sqlite.connect(":memory:") self.cur = self.con.cursor() def test_drop_table(self): self.cur.execute("create table test(i)") self.cur.execute("insert into test(i) values (5)") self.cur.execute("drop table test") def test_pragma(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 test_ddl_does_not_autostart_transaction(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 test_immediate_transactional_ddl(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 test_transactional_ddl(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() class IsolationLevelFromInit(unittest.TestCase): CREATE = "create table t(t)" INSERT = "insert into t values(1)" def setUp(self): self.traced = [] def _run_test(self, cx): cx.execute(self.CREATE) cx.set_trace_callback(lambda stmt: self.traced.append(stmt)) with cx: cx.execute(self.INSERT) def test_isolation_level_default(self): with memory_database() as cx: self._run_test(cx) self.assertEqual(self.traced, ["BEGIN ", self.INSERT, "COMMIT"]) def test_isolation_level_begin(self): with memory_database(isolation_level="") as cx: self._run_test(cx) self.assertEqual(self.traced, ["BEGIN ", self.INSERT, "COMMIT"]) def test_isolation_level_deferred(self): with memory_database(isolation_level="DEFERRED") as cx: self._run_test(cx) self.assertEqual(self.traced, ["BEGIN DEFERRED", self.INSERT, "COMMIT"]) def test_isolation_level_immediate(self): with memory_database(isolation_level="IMMEDIATE") as cx: self._run_test(cx) self.assertEqual(self.traced, ["BEGIN IMMEDIATE", self.INSERT, "COMMIT"]) def test_isolation_level_exclusive(self): with memory_database(isolation_level="EXCLUSIVE") as cx: self._run_test(cx) self.assertEqual(self.traced, ["BEGIN EXCLUSIVE", self.INSERT, "COMMIT"]) def test_isolation_level_none(self): with memory_database(isolation_level=None) as cx: self._run_test(cx) self.assertEqual(self.traced, [self.INSERT]) class IsolationLevelPostInit(unittest.TestCase): QUERY = "insert into t values(1)" def setUp(self): self.cx = sqlite.connect(":memory:") self.cx.execute("create table t(t)") self.traced = [] self.cx.set_trace_callback(lambda stmt: self.traced.append(stmt)) def tearDown(self): self.cx.close() def test_isolation_level_default(self): with self.cx: self.cx.execute(self.QUERY) self.assertEqual(self.traced, ["BEGIN ", self.QUERY, "COMMIT"]) def test_isolation_level_begin(self): self.cx.isolation_level = "" with self.cx: self.cx.execute(self.QUERY) self.assertEqual(self.traced, ["BEGIN ", self.QUERY, "COMMIT"]) def test_isolation_level_deferrred(self): self.cx.isolation_level = "DEFERRED" with self.cx: self.cx.execute(self.QUERY) self.assertEqual(self.traced, ["BEGIN DEFERRED", self.QUERY, "COMMIT"]) def test_isolation_level_immediate(self): self.cx.isolation_level = "IMMEDIATE" with self.cx: self.cx.execute(self.QUERY) self.assertEqual(self.traced, ["BEGIN IMMEDIATE", self.QUERY, "COMMIT"]) def test_isolation_level_exclusive(self): self.cx.isolation_level = "EXCLUSIVE" with self.cx: self.cx.execute(self.QUERY) self.assertEqual(self.traced, ["BEGIN EXCLUSIVE", self.QUERY, "COMMIT"]) def test_isolation_level_none(self): self.cx.isolation_level = None with self.cx: self.cx.execute(self.QUERY) self.assertEqual(self.traced, [self.QUERY]) if __name__ == "__main__": unittest.main()