| /* |
| * 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 "third_party/blink/renderer/modules/webdatabase/sqlite/sqlite_transaction.h" |
| |
| #include "third_party/blink/renderer/modules/webdatabase/sqlite/sqlite_database.h" |
| |
| namespace blink { |
| |
| SQLiteTransaction::SQLiteTransaction(SQLiteDatabase& db, bool read_only) |
| : db_(db), in_progress_(false), read_only_(read_only) {} |
| |
| SQLiteTransaction::~SQLiteTransaction() { |
| if (in_progress_) |
| Rollback(); |
| } |
| |
| void SQLiteTransaction::begin() { |
| if (!in_progress_) { |
| DCHECK(!db_.transaction_in_progress_); |
| // 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 (read_only_) |
| in_progress_ = db_.ExecuteCommand("BEGIN"); |
| else |
| in_progress_ = db_.ExecuteCommand("BEGIN IMMEDIATE"); |
| db_.transaction_in_progress_ = in_progress_; |
| } |
| } |
| |
| void SQLiteTransaction::Commit() { |
| if (in_progress_) { |
| DCHECK(db_.transaction_in_progress_); |
| in_progress_ = !db_.ExecuteCommand("COMMIT"); |
| db_.transaction_in_progress_ = in_progress_; |
| } |
| } |
| |
| 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 (in_progress_) { |
| DCHECK(db_.transaction_in_progress_); |
| db_.ExecuteCommand("ROLLBACK"); |
| in_progress_ = false; |
| db_.transaction_in_progress_ = false; |
| } |
| } |
| |
| void SQLiteTransaction::Stop() { |
| if (in_progress_) { |
| in_progress_ = false; |
| db_.transaction_in_progress_ = 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 in_progress_ && db_.IsAutoCommitOn(); |
| } |
| |
| } // namespace blink |