~drizzle-trunk/drizzle/development

/* -*- 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

 */

#include "config.h"

#include <drizzled/plugin/client.h>

#include <drizzled/item/null.h>

#include <drizzled/lex_string.h>

namespace drizzled

{

bool Item_null::eq(const Item *item, bool) const

{ return item->type() == type(); }

double Item_null::val_real()

{

  // following assert is redundant, because fixed=1 assigned in constructor

  assert(fixed == 1);

  null_value=1;

  return 0.0;

}

int64_t Item_null::val_int()

{

  // following assert is redundant, because fixed=1 assigned in constructor

  assert(fixed == 1);

  null_value=1;

  return 0;

}

/* ARGSUSED */

String *Item_null::val_str(String *)

{

  // following assert is redundant, because fixed=1 assigned in constructor

  assert(fixed == 1);

  null_value=1;

  return 0;

}

my_decimal *Item_null::val_decimal(my_decimal *)

{

  return 0;

}

void Item_null::print(String *str, enum_query_type)

{

  str->append(STRING_WITH_LEN("NULL"));

}

Item *Item_null::safe_charset_converter(const CHARSET_INFO * const tocs)

{

  collation.set(tocs);

  return this;

}

/**

  Store null in field.

  This is used on INSERT.

  Allow NULL to be inserted in timestamp and auto_increment values.

  @param field          Field where we want to store NULL

  @retval

    0   ok

  @retval

    1   Field doesn't support NULL values and can't handle 'field = NULL'

*/

int Item_null::save_in_field(Field *field, bool no_conversions)

{

  return set_field_to_null_with_conversions(field, no_conversions);

}

/**

  Store null in field.

  @param field          Field where we want to store NULL

  @retval

    0    OK

  @retval

    1    Field doesn't support NULL values

*/

int Item_null::save_safe_in_field(Field *field)

{

  return set_field_to_null(field);

}

/**

  Pack data in buffer for sending.

*/

bool Item_null::send(plugin::Client *client, String *)

{

  return client->store();

}

} /* namespace drizzled */