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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* 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; version 2 of the License.
*
* 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 DRIZZLED_ITEM_NULL_H
#define DRIZZLED_ITEM_NULL_H
class Item_null :public Item_basic_constant
{
public:
Item_null(char *name_par=0)
{
maybe_null= null_value= true;
max_length= 0;
name= name_par ? name_par : (char*) "NULL";
fixed= 1;
collation.set(&my_charset_bin, DERIVATION_IGNORABLE);
}
enum Type type() const { return NULL_ITEM; }
bool eq(const Item *item, bool binary_cmp) const;
double val_real();
int64_t val_int();
String *val_str(String *str);
my_decimal *val_decimal(my_decimal *);
int save_in_field(Field *field, bool no_conversions);
int save_safe_in_field(Field *field);
bool send(Protocol *protocol, String *str);
enum Item_result result_type () const { return STRING_RESULT; }
enum_field_types field_type() const { return DRIZZLE_TYPE_NULL; }
bool basic_const_item() const { return 1; }
Item *clone_item() { return new Item_null(name); }
bool is_null() { return true; }
virtual void print(String *str, enum_query_type);
Item *safe_charset_converter(const CHARSET_INFO * const tocs);
bool check_vcol_func_processor(unsigned char *)
{ return false; }
};
class Item_null_result :public Item_null
{
public:
Field *result_field;
Item_null_result() : Item_null(), result_field(0) {}
bool is_result_field() { return result_field != 0; }
void save_in_result_field(bool no_conversions)
{
save_in_field(result_field, no_conversions);
}
bool check_vcol_func_processor(unsigned char *)
{ return true; }
};
#endif /* DRIZZLED_ITEM_NULL_H */
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