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//
// Copyright (c) 2024 Klemens Morgenstern (klemens.morgenstern@gmx.net)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_SQLITE_TRANSACTION_HPP
#define BOOST_SQLITE_TRANSACTION_HPP
#include <boost/sqlite/connection.hpp>
BOOST_SQLITE_BEGIN_NAMESPACE
/**
* @brief A simple transaction guard implementing RAAI for transactions
* @ingroup reference
*
* @par Example
* @code{.cpp}
* sqlite::connection conn;
* conn.connect("./my-database.db");
*
* sqlite::transaction t{conn};
* conn.prepare("insert into log (text) values ($1)").execute(std::make_tuple("booting up"));
* t.commit();
* @endcode
*/
struct transaction
{
/// The mode of the transaction
enum behaviour {deferred, immediate, exclusive};
/// A tag to use, to adopt an already initiated transaction.
constexpr static struct adopt_transaction_t {} adopt_transaction{};
/// Create transaction guard on an existing transaction
transaction(connection & conn, adopt_transaction_t) : conn_(conn), completed_(false)
{
}
/// Create transaction guard and initiate a transaction
transaction(connection & conn) : conn_(conn)
{
conn.execute("BEGIN");
completed_ = false;
}
/// Create transaction guard and initiate a transaction with the defined behaviour
transaction(connection & conn, behaviour b) : conn_(conn)
{
switch (b)
{
case deferred: conn.execute("BEGIN DEFERRED"); break;
case immediate: conn.execute("BEGIN IMMEDIATE"); break;
case exclusive: conn.execute("BEGIN EXCLUSIVE"); break;
}
completed_ = false;
}
// see https://www.sqlite.org/lang_transaction.html re noexcept
/// rollback the transaction if not committed.
~transaction() noexcept(SQLITE_VERSION_NUMBER >= 3007011)
{
if (!completed_)
conn_.execute("ROLLBACK");
}
///@{
/// Commit the transaction.
void commit()
{
conn_.execute("COMMIT");
completed_ = true;
}
void commit(system::error_code & ec, error_info & ei)
{
conn_.execute("COMMIT", ec, ei);
completed_ = true;
}
///@}
///@{
/// Rollback the transaction explicitly.
void rollback()
{
conn_.execute("ROLLBACK");
completed_ = true;
}
void rollback(system::error_code & ec, error_info & ei)
{
conn_.execute("ROLLBACK", ec, ei);
completed_ = true;
}
///@}
private:
connection & conn_;
bool completed_ = true;
};
/**
* @brief A simple transaction guard implementing RAAI for savepoints. Savepoints can be used recursively.
* @ingroup reference
*
* @par Example
* @code{.cpp}
* sqlite::connection conn;
* conn.connect("./my-database.db");
*
* sqlite::savepoint t{conn, "my-savepoint};
* conn.prepare("insert into log (text) values ($1)").execute(std::make_tuple("booting up"));
* t.commit();
* @endcode
*/
struct savepoint
{
/// A tag to use, to adopt an already initiated transaction.
constexpr static transaction::adopt_transaction_t adopt_transaction{};
/// Create savepoint guard on an existing savepoint
savepoint(connection & conn, std::string name, transaction::adopt_transaction_t)
: conn_(conn), name_(std::move(name))
{
}
/// Create transaction guard and initiate it
savepoint(connection & conn, std::string name) : conn_(conn), name_(std::move(name))
{
conn.execute("SAVEPOINT " + name_);
completed_ = false;
}
/// rollback to the savepoint if not committed.
~savepoint() noexcept(SQLITE_VERSION_NUMBER >= 3007011)
{
if (!completed_)
conn_.execute("ROLLBACK TO " + name_);
}
///@{
/// Commit/Release the transaction.
void commit()
{
conn_.execute("RELEASE " + name_);
completed_ = true;
}
void commit(system::error_code & ec, error_info & ei)
{
conn_.execute("RELEASE " + name_, ec, ei);
completed_ = true;
}
void release()
{
conn_.execute("RELEASE " + name_);
completed_ = true;
}
void release(system::error_code & ec, error_info & ei)
{
conn_.execute("RELEASE " + name_, ec, ei);
completed_ = true;
}
///@}
///@{
/// Rollback the transaction explicitly.
void rollback()
{
conn_.execute("ROLLBACK TO" + name_);
completed_ = true;
}
void rollback(system::error_code & ec, error_info & ei)
{
conn_.execute("ROLLBACK TO " + name_, ec, ei);
completed_ = true;
}
///@}
/// The name of the savepoint.
const std::string & name() const {return name_;}
private:
connection & conn_;
std::string name_;
bool completed_ = true;
};
BOOST_SQLITE_END_NAMESPACE
#endif //BOOST_SQLITE_TRANSACTION_HPP
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