125 lines
4.2 KiB
C++
125 lines
4.2 KiB
C++
/*
|
|
* Copyright (C) 2006 Apple 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 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 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 "config.h"
|
|
#include "SQLiteTransaction.h"
|
|
|
|
#include "SQLiteDatabase.h"
|
|
|
|
#if PLATFORM(IOS_FAMILY)
|
|
#include "SQLiteDatabaseTracker.h"
|
|
#endif
|
|
|
|
namespace WebCore {
|
|
|
|
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 PLATFORM(IOS_FAMILY)
|
|
SQLiteDatabaseTracker::incrementTransactionInProgressCount();
|
|
#endif
|
|
if (m_readOnly)
|
|
m_inProgress = m_db.executeCommand("BEGIN"_s);
|
|
else
|
|
m_inProgress = m_db.executeCommand("BEGIN IMMEDIATE"_s);
|
|
m_db.m_transactionInProgress = m_inProgress;
|
|
#if PLATFORM(IOS_FAMILY)
|
|
if (!m_inProgress)
|
|
SQLiteDatabaseTracker::decrementTransactionInProgressCount();
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void SQLiteTransaction::commit()
|
|
{
|
|
if (m_inProgress) {
|
|
ASSERT(m_db.m_transactionInProgress);
|
|
m_inProgress = !m_db.executeCommand("COMMIT"_s);
|
|
m_db.m_transactionInProgress = m_inProgress;
|
|
#if PLATFORM(IOS_FAMILY)
|
|
if (!m_inProgress)
|
|
SQLiteDatabaseTracker::decrementTransactionInProgressCount();
|
|
#endif
|
|
}
|
|
}
|
|
|
|
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"_s);
|
|
m_inProgress = false;
|
|
m_db.m_transactionInProgress = false;
|
|
#if PLATFORM(IOS_FAMILY)
|
|
SQLiteDatabaseTracker::decrementTransactionInProgressCount();
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void SQLiteTransaction::stop()
|
|
{
|
|
if (m_inProgress) {
|
|
m_inProgress = false;
|
|
m_db.m_transactionInProgress = false;
|
|
#if PLATFORM(IOS_FAMILY)
|
|
SQLiteDatabaseTracker::decrementTransactionInProgressCount();
|
|
#endif
|
|
}
|
|
}
|
|
|
|
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 WebCore
|