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select_result.h
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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) 2008 Sun Microsystems, Inc.
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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; version 2 of the License.
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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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#pragma once
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#include <drizzled/current_session.h>
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namespace
drizzled {
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class
select_result
:
public
memory::SqlAlloc
{
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protected
:
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Session
*session;
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Select_Lex_Unit *unit;
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public
:
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select_result
()
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{
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session= current_session;
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}
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virtual
~
select_result
() {}
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virtual
int
prepare(
List<Item>
&,
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Select_Lex_Unit *u)
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{
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unit= u;
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return
0;
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}
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/*
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Because of peculiarities of prepared statements protocol
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we need to know number of columns in the result set (if
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there is a result set) apart from sending columns metadata.
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*/
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virtual
uint32_t field_count(
List<Item>
&fields)
const
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{
return
fields.size(); }
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virtual
void
send_fields(
List<Item>
&)=0;
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virtual
bool
send_data(
List<Item>
&)=0;
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virtual
bool
initialize_tables(
Join
*)
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{
return
0; }
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virtual
bool
send_eof()=0;
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virtual
void
abort() {}
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void
set_session(
Session
*session_arg) { session= session_arg; }
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void
begin_dataset() {}
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/*****************************************************************************
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** Functions to provide a interface to select results
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*****************************************************************************/
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virtual
void
send_error(drizzled::error_t errcode,
const
char
*err);
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/*
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Cleanup instance of this class for next execution of a prepared
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statement/stored procedure.
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*/
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virtual
void
cleanup()
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{
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/* do nothing */
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}
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};
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}
/* namespace drizzled */
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drizzled
select_result.h
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