00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*- 00002 * vim:expandtab:shiftwidth=2:tabstop=2:smarttab: 00003 * 00004 * Copyright (C) 2008 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; version 2 of the License. 00009 * 00010 * This program is distributed in the hope that it will be useful, 00011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 * GNU General Public License for more details. 00014 * 00015 * You should have received a copy of the GNU General Public License 00016 * along with this program; if not, write to the Free Software 00017 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00018 */ 00019 00020 00021 #pragma once 00022 00023 #include <drizzled/current_session.h> 00024 00025 namespace drizzled 00026 { 00027 00028 class Join; 00029 class Select_Lex_Unit; 00030 00031 class select_result :public memory::SqlAlloc { 00032 protected: 00033 Session *session; 00034 Select_Lex_Unit *unit; 00035 00036 public: 00037 select_result() 00038 { 00039 session= current_session; 00040 } 00041 virtual ~select_result() {} 00042 virtual int prepare(List<Item> &, 00043 Select_Lex_Unit *u) 00044 { 00045 unit= u; 00046 return 0; 00047 } 00048 /* 00049 Because of peculiarities of prepared statements protocol 00050 we need to know number of columns in the result set (if 00051 there is a result set) apart from sending columns metadata. 00052 */ 00053 virtual uint32_t field_count(List<Item> &fields) const 00054 { return fields.size(); } 00055 virtual bool send_fields(List<Item> &list)=0; 00056 virtual bool send_data(List<Item> &items)=0; 00057 virtual bool initialize_tables (Join *) 00058 { return 0; } 00059 virtual bool send_eof()=0; 00060 virtual void abort() {} 00061 void set_session(Session *session_arg) { session= session_arg; } 00062 void begin_dataset() {} 00063 00064 /***************************************************************************** 00065 ** Functions to provide a interface to select results 00066 *****************************************************************************/ 00067 00068 virtual void send_error(drizzled::error_t errcode, const char *err); 00069 00070 /* 00071 Cleanup instance of this class for next execution of a prepared 00072 statement/stored procedure. 00073 */ 00074 virtual void cleanup() 00075 { 00076 /* do nothing */ 00077 } 00078 00079 }; 00080 00081 } /* namespace drizzled */ 00082