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/* - mode: c++ c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 MySQL
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef DRIZZLE_SERVER_FIELD_NULL
#define DRIZZLE_SERVER_FIELD_NULL
#include <drizzled/field/str.h>
/*
* Everything saved in this will disappear. It will always return NULL
*/
class Field_null :public Field_str {
static unsigned char null[1];
public:
using Field::store;
using Field::val_str;
using Field::cmp;
using Field::val_int;
Field_null(unsigned char *ptr_arg, uint32_t len_arg,
enum utype unireg_check_arg, const char *field_name_arg,
const CHARSET_INFO * const cs)
:Field_str(ptr_arg, len_arg, null, 1,
unireg_check_arg, field_name_arg, cs)
{}
enum_field_types type() const { return DRIZZLE_TYPE_NULL;}
int store(const char *, uint32_t, const CHARSET_INFO * const)
{ null[0]=1; return 0; }
int store(double)
{ null[0]=1; return 0; }
int store(int64_t, bool)
{ null[0]=1; return 0; }
int store_decimal(const my_decimal *)
{ null[0]=1; return 0; }
int reset(void)
{ return 0; }
double val_real(void)
{ return 0.0;}
int64_t val_int(void)
{ return 0;}
my_decimal *val_decimal(my_decimal *) { return 0; }
String *val_str(String *, String *value2)
{ value2->length(0); return value2;}
int cmp(const unsigned char *, const unsigned char *) { return 0;}
void sort_string(unsigned char *, uint32_t) {}
uint32_t pack_length() const { return 0; }
void sql_type(String &str) const;
uint32_t size_of() const { return sizeof(*this); }
uint32_t max_display_length() { return 4; }
};
#endif
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