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get_user_var.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/function/func.h>
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#include <drizzled/lex_string.h>
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namespace
drizzled {
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class
Item_func_get_user_var
:
public
Item_func
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{
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user_var_entry
*var_entry;
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Item_result m_cached_result_type;
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Session
&session;
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public
:
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str_ref
name;
// keep it public
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Item_func_get_user_var
(
Session
&session_arg,
str_ref
a) :
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Item_func
(),
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m_cached_result_type(STRING_RESULT),
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session(session_arg),
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name(a)
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{}
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enum
Functype functype()
const
{
return
GUSERVAR_FUNC; }
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str_ref
get_name() {
return
name; }
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double
val_real
();
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int64_t
val_int
();
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type::Decimal
*
val_decimal
(
type::Decimal
*);
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String
*
val_str
(
String
* str);
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void
fix_length_and_dec();
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virtual
void
print
(
String
*str);
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enum
Item_result result_type()
const
;
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/*
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We must always return variables as strings to guard against selects of type
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select @t1:=1,@t1,@t:="hello",@t from foo where (@t1:= t2.b)
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*/
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const
char
*func_name()
const
{
return
"get_user_var"
; }
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bool
const_item
()
const
;
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table_map
used_tables
()
const
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{
return
const_item
() ? 0 : RAND_TABLE_BIT; }
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bool
eq
(
const
Item
*item,
bool
binary_cmp)
const
;
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};
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}
/* namespace drizzled */
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drizzled
function
get_user_var.h
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