Drizzled Public API Documentation

delete.cc
00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2009 Sun Microsystems, Inc.
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; either version 2 of the License, or
00009  *  (at your option) any later version.
00010  *
00011  *  This program is distributed in the hope that it will be useful,
00012  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  *  GNU General Public License for more details.
00015  *
00016  *  You should have received a copy of the GNU General Public License
00017  *  along with this program; if not, write to the Free Software
00018  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00019  */
00020 
00021 #include <config.h>
00022 #include <drizzled/show.h>
00023 #include <drizzled/session.h>
00024 #include <drizzled/lock.h>
00025 #include <drizzled/probes.h>
00026 #include <drizzled/statement/delete.h>
00027 #include <drizzled/sql_lex.h>
00028 
00029 namespace drizzled
00030 {
00031 
00032 bool statement::Delete::execute()
00033 {
00034   DRIZZLE_DELETE_START(session().getQueryString()->c_str());
00035   TableList *first_table= (TableList *) lex().select_lex.table_list.first;
00036   TableList *all_tables= lex().query_tables;
00037   Select_Lex *select_lex= &lex().select_lex;
00038   Select_Lex_Unit *unit= &lex().unit;
00039   assert(first_table == all_tables && first_table != 0);
00040   assert(select_lex->offset_limit == 0);
00041   unit->set_limit(select_lex);
00042   bool need_start_waiting= false;
00043 
00044   if (! (need_start_waiting= not session().wait_if_global_read_lock(0, 1)))
00045   {
00046     return true;
00047   }
00048 
00049   bool res= delete_query(&session(), all_tables, select_lex->where,
00050                          &select_lex->order_list,
00051                          unit->select_limit_cnt, select_lex->options,
00052                          false);
00053   /*
00054     Release the protection against the global read lock and wake
00055     everyone, who might want to set a global read lock.
00056   */
00057   session().startWaitingGlobalReadLock();
00058 
00059   return res;
00060 }
00061 
00062 } /* namespace drizzled */