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// Copyright 2011 Google 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER 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 "utils/sqlite/transaction.hpp"
#include "utils/format/macros.hpp"
#include "utils/logging/macros.hpp"
#include "utils/sanity.hpp"
#include "utils/sqlite/database.hpp"
#include "utils/sqlite/exceptions.hpp"
#include "utils/sqlite/statement.ipp"
namespace sqlite = utils::sqlite;
/// Internal implementation for the transaction.
struct utils::sqlite::transaction::impl {
/// The database this transaction belongs to.
database& db;
/// Possible statuses of a transaction.
enum statuses {
open_status,
committed_status,
rolled_back_status,
};
/// The current status of the transaction.
statuses status;
/// Constructs a new transaction.
///
/// \param db_ The database this transaction belongs to.
/// \param status_ The status of the new transaction.
impl(database& db_, const statuses status_) :
db(db_),
status(status_)
{
}
/// Destroys the transaction.
///
/// This rolls back the transaction if it is open.
~impl(void)
{
if (status == impl::open_status) {
try {
rollback();
} catch (const sqlite::error& e) {
LW(F("Error while rolling back a transaction: %s") % e.what());
}
}
}
/// Commits the transaction.
///
/// \throw api_error If there is any problem while committing the
/// transaction.
void
commit(void)
{
PRE(status == impl::open_status);
db.exec("COMMIT");
status = impl::committed_status;
}
/// Rolls the transaction back.
///
/// \throw api_error If there is any problem while rolling the
/// transaction back.
void
rollback(void)
{
PRE(status == impl::open_status);
db.exec("ROLLBACK");
status = impl::rolled_back_status;
}
};
/// Initializes a transaction object.
///
/// This is an internal function. Use database::begin_transaction() to
/// instantiate one of these objects.
///
/// \param db The database this transaction belongs to.
sqlite::transaction::transaction(database& db) :
_pimpl(new impl(db, impl::open_status))
{
}
/// Destructor for the transaction.
sqlite::transaction::~transaction(void)
{
}
/// Commits the transaction.
///
/// \throw api_error If there is any problem while committing the transaction.
void
sqlite::transaction::commit(void)
{
_pimpl->commit();
}
/// Rolls the transaction back.
///
/// \throw api_error If there is any problem while rolling the transaction back.
void
sqlite::transaction::rollback(void)
{
_pimpl->rollback();
}
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