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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2009 Sun Microsystems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "drizzled/show.h"
#include "drizzled/session.h"
#include "drizzled/statement/rollback_to_savepoint.h"
#include "drizzled/transaction_services.h"
#include "drizzled/named_savepoint.h"
#include "drizzled/util/functors.h"
#include <string>
using namespace std;
namespace drizzled
{
bool statement::RollbackToSavepoint::execute()
{
/*
* If AUTOCOMMIT is off and resource contexts are empty then we need
* to start a transaction. It will be empty when ROLLBACK TO SAVEPOINT
* starts the transaction. Table affecting statements do this work in
* lockTables() by calling startStatement().
*/
if ( (session->options & OPTION_NOT_AUTOCOMMIT) &&
(session->transaction.all.getResourceContexts().empty() == true) )
{
if (session->startTransaction() == false)
{
return false;
}
}
/*
* Handle these situations:
*
* If the first savepoint on the deck matches the
* name to find, simply call rollback_to_savepoint
* for the resource managers.
*
* If the first savepoint on the deck does NOT match
* the name to find, then we need to search through
* the deque to find the savepoint we need. If we
* don't find it, we return an error. If we do
* find it, we must restructure the deque by removing
* all savepoints "above" the one we find.
*/
deque<NamedSavepoint> &savepoints= session->transaction.savepoints;
TransactionServices &transaction_services= TransactionServices::singleton();
/* Short-circuit for no savepoints */
if (savepoints.empty())
{
my_error(ER_SP_DOES_NOT_EXIST,
MYF(0),
"SAVEPOINT",
session->lex->ident.str);
return false;
}
{
/* Short-circuit for first savepoint */
NamedSavepoint &first_savepoint= savepoints.front();
const string &first_savepoint_name= first_savepoint.getName();
if (my_strnncoll(system_charset_info,
(unsigned char *) session->lex->ident.str,
session->lex->ident.length,
(unsigned char *) first_savepoint_name.c_str(),
first_savepoint_name.size()) == 0)
{
/* Found the named savepoint we want to rollback to */
(void) transaction_services.rollbackToSavepoint(session, first_savepoint);
if (session->transaction.all.hasModifiedNonTransData())
{
push_warning(session,
DRIZZLE_ERROR::WARN_LEVEL_WARN,
ER_WARNING_NOT_COMPLETE_ROLLBACK,
ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
}
session->my_ok();
return false;
}
}
/*
* OK, from here on out it means that we have savepoints
* but that the first savepoint isn't the one we're looking
* for. We need to search through the savepoints and find
* the one we're looking for, removing all savepoints "above"
* the one we need.
*/
bool found= false;
deque<NamedSavepoint> copy_savepoints(savepoints); /* used to restore if not found */
deque<NamedSavepoint> new_savepoints;
while (savepoints.empty() == false)
{
NamedSavepoint &sv= savepoints.front();
const string &sv_name= sv.getName();
if (! found &&
my_strnncoll(system_charset_info,
(unsigned char *) session->lex->ident.str,
session->lex->ident.length,
(unsigned char *) sv_name.c_str(),
sv_name.size()) == 0)
{
/* Found the named savepoint we want to rollback to */
found= true;
(void) transaction_services.rollbackToSavepoint(session, sv);
}
if (found)
{
/*
* We push all savepoints "below" the found savepoint
* to our new savepoint list, in reverse order to keep
* the stack order correct.
*/
new_savepoints.push_back(sv);
}
savepoints.pop_front();
}
if (found)
{
if (session->transaction.all.hasModifiedNonTransData())
{
push_warning(session,
DRIZZLE_ERROR::WARN_LEVEL_WARN,
ER_WARNING_NOT_COMPLETE_ROLLBACK,
ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
}
/* Store new savepoints list */
session->transaction.savepoints= new_savepoints;
session->my_ok();
}
else
{
/* restore the original savepoint list */
session->transaction.savepoints= copy_savepoints;
my_error(ER_SP_DOES_NOT_EXIST,
MYF(0),
"SAVEPOINT",
session->lex->ident.str);
}
return false;
}
} /* namespace drizzled */
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