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drizzled/statement/rollback_to_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 "config.h"
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#include <drizzled/show.h>
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#include <drizzled/session.h>
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#include <drizzled/statement/rollback_to_savepoint.h>
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#include "drizzled/transaction_services.h"
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#include "drizzled/named_savepoint.h"
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#include "drizzled/util/functors.h"
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#include <string>
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using namespace std;
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namespace drizzled
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{
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bool statement::RollbackToSavepoint::execute()
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{
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  /*
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   * Handle these situations:
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   *
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   * If the first savepoint on the deck matches the
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   * name to find, simply call rollback_to_savepoint
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   * for the resource managers.
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   *
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   * If the first savepoint on the deck does NOT match
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   * the name to find, then we need to search through
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   * the deque to find the savepoint we need.  If we
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   * don't find it, we return an error.  If we do
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   * find it, we must restructure the deque by removing
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   * all savepoints "above" the one we find.
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   */
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  deque<NamedSavepoint> &savepoints= session->transaction.savepoints;
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  TransactionServices &transaction_services= TransactionServices::singleton();
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  /* Short-circuit for no savepoints */
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  if (savepoints.empty())
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  {
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    my_error(ER_SP_DOES_NOT_EXIST, 
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             MYF(0), 
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             "SAVEPOINT", 
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             session->lex->ident.str);
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    return false;
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  }
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  {
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    /* Short-circuit for first savepoint */
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    NamedSavepoint &first_savepoint= savepoints.front();
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    const string &first_savepoint_name= first_savepoint.getName();
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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 *) first_savepoint_name.c_str(), 
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                     first_savepoint_name.size()) == 0)
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    {
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      /* Found the named savepoint we want to rollback to */
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      (void) transaction_services.rollbackToSavepoint(session, first_savepoint);
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      if (session->transaction.all.hasModifiedNonTransData())
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      {
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        push_warning(session, 
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                     DRIZZLE_ERROR::WARN_LEVEL_WARN,
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                     ER_WARNING_NOT_COMPLETE_ROLLBACK,
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                     ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
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      }
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      session->my_ok();
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      return false;
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    }
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  }
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  /* 
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   * OK, from here on out it means that we have savepoints
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   * but that the first savepoint isn't the one we're looking
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   * for.  We need to search through the savepoints and find
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   * the one we're looking for, removing all savepoints "above"
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   * the one we need.
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   */
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  bool found= false;
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  deque<NamedSavepoint> copy_savepoints(savepoints); /* used to restore if not found */
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  deque<NamedSavepoint> new_savepoints;
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  while (savepoints.empty() == false)
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  {
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    NamedSavepoint &sv= savepoints.front();
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    const string &sv_name= sv.getName();
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    if (! found && 
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        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.c_str(), 
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                     sv_name.size()) == 0)
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    {
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      /* Found the named savepoint we want to rollback to */
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      found= true;
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      (void) transaction_services.rollbackToSavepoint(session, sv);
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    }
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    if (found)
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    {
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      /* 
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       * We push all savepoints "below" the found savepoint
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       * to our new savepoint list, in reverse order to keep
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       * the stack order correct. 
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       */
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      new_savepoints.push_back(sv);
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    }
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    savepoints.pop_front();
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  }
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  if (found)
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  {
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    if (session->transaction.all.hasModifiedNonTransData())
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    {
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      push_warning(session, 
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                   DRIZZLE_ERROR::WARN_LEVEL_WARN,
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                   ER_WARNING_NOT_COMPLETE_ROLLBACK,
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                   ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
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    }
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    /* Store new savepoints list */
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    session->transaction.savepoints= new_savepoints;
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    session->my_ok();
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  }
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  else
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  {
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    /* restore the original savepoint list */
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    session->transaction.savepoints= copy_savepoints;
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    my_error(ER_SP_DOES_NOT_EXIST, 
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             MYF(0), 
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             "SAVEPOINT", 
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             session->lex->ident.str);
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  }
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  return false;
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}
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} /* namespace drizzled */