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/statement/unlock_tables.h> 00026 00027 namespace drizzled 00028 { 00029 00030 bool statement::UnlockTables::execute() 00031 { 00032 /* 00033 It is critical for mysqldump --single-transaction --master-data that 00034 UNLOCK TABLES does not implicitely commit a connection which has only 00035 done FLUSH TABLES WITH READ LOCK + BEGIN. If this assumption becomes 00036 false, mysqldump will not work. 00037 */ 00038 if (session().isGlobalReadLock()) 00039 { 00040 session().unlockGlobalReadLock(); 00041 session().my_ok(); 00042 } 00043 else 00044 { 00045 my_error(ER_NO_LOCK_HELD, MYF(0)); 00046 } 00047 00048 return false; 00049 } 00050 00051 } /* namespace drizzled */ 00052