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type_holder.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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namespace
drizzled {
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/*
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Item_type_holder used to store type. name, length of Item for UNIONS &
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derived tables.
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Item_type_holder do not need cleanup() because its time of live limited by
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single SP/PS execution.
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*/
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class
Item_type_holder
:
public
Item
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{
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protected
:
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TYPELIB
*enum_set_typelib;
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enum_field_types fld_type;
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void
get_full_info
(
Item
*item);
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/* It is used to count decimal precision in join_types */
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int
prev_decimal_int_part;
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public
:
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Item_type_holder
(
Session
*session,
Item
*item);
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Item_result
result_type
()
const
;
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enum_field_types field_type()
const
{
return
fld_type; };
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enum
Type type()
const
{
return
TYPE_HOLDER; }
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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
*val);
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String
*
val_str
(
String
* val);
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bool
join_types
(
Session
*session,
Item
*item);
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Field
*
make_field_by_type
(
Table
*table);
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static
uint32_t
display_length
(
Item
*item);
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static
enum_field_types
get_real_type
(
Item
*item);
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};
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}
/* namespace drizzled */
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drizzled
item
type_holder.h
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