~drizzle-trunk/drizzle/development

/* - 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/field/str.h>

/*

 * Everything saved in this will disappear. It will always return NULL

 */

class Field_null :public Field_str {

  static unsigned char null[1];

public:

  Field_null(unsigned char *ptr_arg, uint32_t len_arg,

	     enum utype unireg_check_arg, const char *field_name_arg,

	     const CHARSET_INFO * const 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 *, uint32_t, const CHARSET_INFO * const)

  { null[0]=1; return 0; }

  int store(double)

  { null[0]=1; return 0; }

  int store(int64_t, bool)

  { null[0]=1; return 0; }

  int store_decimal(const my_decimal *)

  { 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 *, String *value2)

  { value2->length(0); return value2;}

  int cmp(const unsigned char *, const unsigned char *) { return 0;}

  void sort_string(unsigned char *, uint32_t)  {}

  uint32_t pack_length() const { return 0; }

  void sql_type(String &str) const;

  uint32_t size_of() const { return sizeof(*this); }

  uint32_t max_display_length() { return 4; }

};

#endif