~drizzle-trunk/drizzle/development

/* -*- 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/savepoint.h>

#include <drizzled/transaction_services.h>

#include <drizzled/named_savepoint.h>

#include <string>

#include <deque>

using namespace std;

namespace drizzled

{

bool statement::Savepoint::execute()

{

  if (! (session().options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))

  {

    /* AUTOCOMMIT is on and not in a BEGIN */

    session().my_ok();

  }

  else

  {

    /*

     * If AUTOCOMMIT is off and resource contexts are empty then we need

     * to start a transaction. It will be empty when SAVEPOINT starts the

     * transaction. Table affecting statements do this work in lockTables()

     * by calling startStatement().

     */

    if ( (session().options & OPTION_NOT_AUTOCOMMIT) &&

         (transaction().all.getResourceContexts().empty() == true) )

    {

      if (session().startTransaction() == false)

      {

        return false;

      }

    }

    /*

     * Look through the savepoints.  If we find one with

     * the same name, delete it.

     */

    TransactionServices &transaction_services= TransactionServices::singleton();

    deque<NamedSavepoint> &savepoints= transaction().savepoints;

    deque<NamedSavepoint>::iterator iter;

    for (iter= savepoints.begin();

         iter != savepoints.end();

         ++iter)

    {

      NamedSavepoint &sv= *iter;

      const string &sv_name= sv.getName();

      if (my_strnncoll(system_charset_info,

                       (unsigned char *) lex().ident.str,

                       lex().ident.length,

                       (unsigned char *) sv_name.c_str(),

                       sv_name.size()) == 0)

        break;

    }

    if (iter != savepoints.end())

    {

      NamedSavepoint &sv= *iter;

      (void) transaction_services.releaseSavepoint(session(), sv);

      savepoints.erase(iter);

    }

    NamedSavepoint newsv(lex().ident.str, lex().ident.length);

    if (transaction_services.setSavepoint(session(), newsv))

    {

      return true;

    }

    else

    {

      savepoints.push_front(newsv);

      session().my_ok();

    }

  }

  return false;

}

} /* namespace drizzled */