| /* |
| * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "modules/webdatabase/sqlite/SQLiteTransaction.h" |
| |
| #include "modules/webdatabase/sqlite/SQLiteDatabase.h" |
| |
| namespace blink { |
| |
| SQLiteTransaction::SQLiteTransaction(SQLiteDatabase& db, bool readOnly) |
| : m_db(db) |
| , m_inProgress(false) |
| , m_readOnly(readOnly) |
| { |
| } |
| |
| SQLiteTransaction::~SQLiteTransaction() |
| { |
| if (m_inProgress) |
| rollback(); |
| } |
| |
| void SQLiteTransaction::begin() |
| { |
| if (!m_inProgress) { |
| ASSERT(!m_db.m_transactionInProgress); |
| // Call BEGIN IMMEDIATE for a write transaction to acquire |
| // a RESERVED lock on the DB file. Otherwise, another write |
| // transaction (on another connection) could make changes |
| // to the same DB file before this transaction gets to execute |
| // any statements. If that happens, this transaction will fail. |
| // http://www.sqlite.org/lang_transaction.html |
| // http://www.sqlite.org/lockingv3.html#locking |
| if (m_readOnly) |
| m_inProgress = m_db.executeCommand("BEGIN"); |
| else |
| m_inProgress = m_db.executeCommand("BEGIN IMMEDIATE"); |
| m_db.m_transactionInProgress = m_inProgress; |
| } |
| } |
| |
| void SQLiteTransaction::commit() |
| { |
| if (m_inProgress) { |
| ASSERT(m_db.m_transactionInProgress); |
| m_inProgress = !m_db.executeCommand("COMMIT"); |
| m_db.m_transactionInProgress = m_inProgress; |
| } |
| } |
| |
| void SQLiteTransaction::rollback() |
| { |
| // We do not use the 'm_inProgress = m_db.executeCommand("ROLLBACK")' construct here, |
| // because m_inProgress should always be set to false after a ROLLBACK, and |
| // m_db.executeCommand("ROLLBACK") can sometimes harmlessly fail, thus returning |
| // a non-zero/true result (http://www.sqlite.org/lang_transaction.html). |
| if (m_inProgress) { |
| ASSERT(m_db.m_transactionInProgress); |
| m_db.executeCommand("ROLLBACK"); |
| m_inProgress = false; |
| m_db.m_transactionInProgress = false; |
| } |
| } |
| |
| void SQLiteTransaction::stop() |
| { |
| if (m_inProgress) { |
| m_inProgress = false; |
| m_db.m_transactionInProgress = false; |
| } |
| } |
| |
| bool SQLiteTransaction::wasRolledBackBySqlite() const |
| { |
| // According to http://www.sqlite.org/c3ref/get_autocommit.html, |
| // the auto-commit flag should be off in the middle of a transaction |
| return m_inProgress && m_db.isAutoCommitOn(); |
| } |
| |
| } // namespace blink |