1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/* - 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/mysql_priv.h>
/*
Everything saved in this will disappear. It will always return NULL
*/
class Field_null :public Field_str {
static uchar null[1];
public:
Field_null(uchar *ptr_arg, uint32_t len_arg,
enum utype unireg_check_arg, const char *field_name_arg,
CHARSET_INFO *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 *to __attribute__((unused)),
uint length __attribute__((unused)),
CHARSET_INFO *cs __attribute__((unused)))
{ null[0]=1; return 0; }
int store(double nr __attribute__((unused)))
{ null[0]=1; return 0; }
int store(int64_t nr __attribute__((unused)),
bool unsigned_val __attribute__((unused)))
{ null[0]=1; return 0; }
int store_decimal(const my_decimal *d __attribute__((unused)))
{ 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 *value __attribute__((unused)),
String *value2)
{ value2->length(0); return value2;}
int cmp(const uchar *a __attribute__((unused)),
const uchar *b __attribute__((unused))) { return 0;}
void sort_string(uchar *buff __attribute__((unused)),
uint length __attribute__((unused))) {}
uint32_t pack_length() const { return 0; }
void sql_type(String &str) const;
uint size_of() const { return sizeof(*this); }
uint32_t max_display_length() { return 4; }
};
#endif
|