1
/* - mode: c++ c-basic-offset: 2; indent-tabs-mode: nil; -*-
2
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
4
* Copyright (C) 2008 MySQL
6
* This program is free software; you can redistribute it and/or modify
7
* it under the terms of the GNU General Public License as published by
8
* the Free Software Foundation; either version 2 of the License, or
9
* (at your option) any later version.
11
* This program is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14
* GNU General Public License for more details.
16
* You should have received a copy of the GNU General Public License
17
* along with this program; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21
#ifndef DRIZZLE_SERVER_FIELD_NULL
22
#define DRIZZLE_SERVER_FIELD_NULL
25
Everything saved in this will disappear. It will always return NULL
28
class Field_null :public Field_str {
29
static unsigned char null[1];
31
Field_null(unsigned char *ptr_arg, uint32_t len_arg,
32
enum utype unireg_check_arg, const char *field_name_arg,
33
const CHARSET_INFO * const cs)
34
:Field_str(ptr_arg, len_arg, null, 1,
35
unireg_check_arg, field_name_arg, cs)
37
enum_field_types type() const { return DRIZZLE_TYPE_NULL;}
38
int store(const char *to __attribute__((unused)),
39
uint32_t length __attribute__((unused)),
40
const CHARSET_INFO * const cs __attribute__((unused)))
41
{ null[0]=1; return 0; }
42
int store(double nr __attribute__((unused)))
43
{ null[0]=1; return 0; }
44
int store(int64_t nr __attribute__((unused)),
45
bool unsigned_val __attribute__((unused)))
46
{ null[0]=1; return 0; }
47
int store_decimal(const my_decimal *d __attribute__((unused)))
48
{ null[0]=1; return 0; }
55
my_decimal *val_decimal(my_decimal *) { return 0; }
56
String *val_str(String *value __attribute__((unused)),
58
{ value2->length(0); return value2;}
59
int cmp(const unsigned char *a __attribute__((unused)),
60
const unsigned char *b __attribute__((unused))) { return 0;}
61
void sort_string(unsigned char *buff __attribute__((unused)),
62
uint32_t length __attribute__((unused))) {}
63
uint32_t pack_length() const { return 0; }
64
void sql_type(String &str) const;
65
uint32_t size_of() const { return sizeof(*this); }
66
uint32_t max_display_length() { return 4; }