Drizzled Public API Documentation

null.cc
1 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3  *
4  * Copyright (C) 2008 Sun Microsystems, Inc.
5  *
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; version 2 of the License.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 #include <config.h>
21 
22 #include <drizzled/field.h>
23 #include <drizzled/item/null.h>
24 #include <drizzled/lex_string.h>
25 #include <drizzled/plugin/client.h>
26 
27 namespace drizzled {
28 
29 bool Item_null::eq(const Item *item, bool) const
30 { return item->type() == type(); }
31 
33 {
34  // following assert is redundant, because fixed=1 assigned in constructor
35  assert(fixed == 1);
36  null_value=1;
37  return 0.0;
38 }
40 {
41  // following assert is redundant, because fixed=1 assigned in constructor
42  assert(fixed == 1);
43  null_value=1;
44  return 0;
45 }
46 /* ARGSUSED */
48 {
49  // following assert is redundant, because fixed=1 assigned in constructor
50  assert(fixed == 1);
51  null_value=1;
52  return 0;
53 }
54 
56 {
57  return 0;
58 }
59 
60 
62 {
63  str->append(STRING_WITH_LEN("NULL"));
64 }
65 
66 
67 Item *Item_null::safe_charset_converter(const charset_info_st * const tocs)
68 {
69  collation.set(tocs);
70  return this;
71 }
72 
87 int Item_null::save_in_field(Field *field, bool no_conversions)
88 {
89  return set_field_to_null_with_conversions(field, no_conversions);
90 }
91 
104 {
105  return set_field_to_null(field);
106 }
107 
113 {
114  client->store();
115 }
116 
117 } /* namespace drizzled */