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drizzled/statement/savepoint.cc
 
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 
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 *
 
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 *  Copyright (C) 2009 Sun Microsystems
 
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 *
 
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 *  This program is free software; you can redistribute it and/or modify
 
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 *  it under the terms of the GNU General Public License as published by
 
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 *  the Free Software Foundation; either version 2 of the License, or
 
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 *  (at your option) any later version.
 
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 *
 
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 *  This program is distributed in the hope that it will be useful,
 
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 *  GNU General Public License for more details.
 
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 *
 
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 *  You should have received a copy of the GNU General Public License
 
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 *  along with this program; if not, write to the Free Software
 
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
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 */
 
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#include <drizzled/server_includes.h>
 
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#include <drizzled/show.h>
 
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#include <drizzled/session.h>
 
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#include <drizzled/statement/savepoint.h>
 
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using namespace drizzled;
 
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bool statement::Savepoint::execute()
 
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{
 
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  if (! (session->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
 
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  {
 
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    session->my_ok();
 
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  }
 
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  else
 
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  {
 
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    SAVEPOINT **sv, *newsv;
 
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    for (sv= &session->transaction.savepoints; *sv; sv= &(*sv)->prev)
 
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    {
 
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      if (my_strnncoll(system_charset_info,
 
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                       (unsigned char *) session->lex->ident.str, 
 
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                       session->lex->ident.length,
 
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                       (unsigned char *) (*sv)->name, 
 
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                       (*sv)->length) == 0)
 
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        return false;
 
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    }
 
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    if (*sv) /* old savepoint of the same name exists */
 
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    {
 
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      newsv= *sv;
 
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      ha_release_savepoint(session, *sv); // it cannot fail
 
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      *sv= (*sv)->prev;
 
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    }
 
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    else if ((newsv= (SAVEPOINT *) alloc_root(&session->transaction.mem_root,
 
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            savepoint_alloc_size)) == 0)
 
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    {
 
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      my_error(ER_OUT_OF_RESOURCES, MYF(0));
 
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      return false;
 
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    }
 
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    newsv->name= strmake_root(&session->transaction.mem_root,
 
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                              session->lex->ident.str, 
 
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                              session->lex->ident.length);
 
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    newsv->length= session->lex->ident.length;
 
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    /*
 
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       if we'll get an error here, don't add new savepoint to the list.
 
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       we'll lose a little bit of memory in transaction mem_root, but it'll
 
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       be free'd when transaction ends anyway
 
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     */
 
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    if (ha_savepoint(session, newsv))
 
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    {
 
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      return true;
 
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    }
 
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    else
 
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    {
 
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      newsv->prev= session->transaction.savepoints;
 
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      session->transaction.savepoints= newsv;
 
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      session->my_ok();
 
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    }
 
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  }
 
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  return false;
 
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}