00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*- 00002 * vim:expandtab:shiftwidth=2:tabstop=2:smarttab: 00003 * 00004 * Copyright (C) 2008 Sun Microsystems, Inc. 00005 * 00006 * This program is free software; you can redistribute it and/or modify 00007 * it under the terms of the GNU General Public License as published by 00008 * the Free Software Foundation; version 2 of the License. 00009 * 00010 * This program is distributed in the hope that it will be useful, 00011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 * GNU General Public License for more details. 00014 * 00015 * You should have received a copy of the GNU General Public License 00016 * along with this program; if not, write to the Free Software 00017 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00018 */ 00019 00020 #include <config.h> 00021 00022 #include <drizzled/field.h> 00023 #include <drizzled/item/null.h> 00024 #include <drizzled/lex_string.h> 00025 #include <drizzled/plugin/client.h> 00026 00027 namespace drizzled 00028 { 00029 00030 bool Item_null::eq(const Item *item, bool) const 00031 { return item->type() == type(); } 00032 00033 double Item_null::val_real() 00034 { 00035 // following assert is redundant, because fixed=1 assigned in constructor 00036 assert(fixed == 1); 00037 null_value=1; 00038 return 0.0; 00039 } 00040 int64_t Item_null::val_int() 00041 { 00042 // following assert is redundant, because fixed=1 assigned in constructor 00043 assert(fixed == 1); 00044 null_value=1; 00045 return 0; 00046 } 00047 /* ARGSUSED */ 00048 String *Item_null::val_str(String *) 00049 { 00050 // following assert is redundant, because fixed=1 assigned in constructor 00051 assert(fixed == 1); 00052 null_value=1; 00053 return 0; 00054 } 00055 00056 type::Decimal *Item_null::val_decimal(type::Decimal *) 00057 { 00058 return 0; 00059 } 00060 00061 00062 void Item_null::print(String *str) 00063 { 00064 str->append(STRING_WITH_LEN("NULL")); 00065 } 00066 00067 00068 Item *Item_null::safe_charset_converter(const CHARSET_INFO * const tocs) 00069 { 00070 collation.set(tocs); 00071 return this; 00072 } 00073 00088 int Item_null::save_in_field(Field *field, bool no_conversions) 00089 { 00090 return set_field_to_null_with_conversions(field, no_conversions); 00091 } 00092 00104 int Item_null::save_safe_in_field(Field *field) 00105 { 00106 return set_field_to_null(field); 00107 } 00108 00113 bool Item_null::send(plugin::Client *client, String *) 00114 { 00115 return client->store(); 00116 } 00117 00118 } /* namespace drizzled */