~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/lock.h>

#include <drizzled/probes.h>

#include <drizzled/statement/delete.h>

#include <drizzled/sql_lex.h>

namespace drizzled

{

bool statement::Delete::execute()

{

  DRIZZLE_DELETE_START(session().getQueryString()->c_str());

  TableList *first_table= (TableList *) lex().select_lex.table_list.first;

  TableList *all_tables= lex().query_tables;

  Select_Lex *select_lex= &lex().select_lex;

  Select_Lex_Unit *unit= &lex().unit;

  assert(first_table == all_tables && first_table != 0);

  assert(select_lex->offset_limit == 0);

  unit->set_limit(select_lex);

  if (session().wait_if_global_read_lock(0, 1))

  {

    return true;

  }

  bool res= delete_query(&session(), all_tables, select_lex->where,

                         &select_lex->order_list,

                         unit->select_limit_cnt, select_lex->options,

                         false);

  /*

    Release the protection against the global read lock and wake

    everyone, who might want to set a global read lock.

  */

  session().startWaitingGlobalReadLock();

  return res;

}

} /* namespace drizzled */