~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, Inc.

 *

 *  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_SET_VAR_H

#define DRIZZLED_SET_VAR_H

#include "drizzled/memory/sql_alloc.h"

#include "drizzled/sql_list.h"

#include "drizzled/lex_string.h"

namespace drizzled

{

namespace plugin

{

class StorageEngine;

}

class sys_var;

class Item;

class Item_func_set_user_var;

class Time_zone;

typedef struct my_locale_st MY_LOCALE;

typedef struct charset_info_st CHARSET_INFO;

/* Classes to support the SET command */

/****************************************************************************

  Variables that are changable runtime are declared using the

  following classes

****************************************************************************/

/****************************************************************************

  Classes for parsing of the SET command

****************************************************************************/

class set_var_base :

  public memory::SqlAlloc

{

public:

  set_var_base() {}

  virtual ~set_var_base() {}

  virtual int check(Session *session)=0;	/* To check privileges etc. */

  virtual int update(Session *session)=0;	/* To set the value */

  /* light check for PS */

};

/* MySQL internal variables */

class set_var :

  public set_var_base

{

public:

  sys_var *var;

  Item *value;

  sql_var_t type;

  union

  {

    const CHARSET_INFO *charset;

    uint32_t uint32_t_value;

    uint64_t uint64_t_value;

    size_t size_t_value;

    plugin::StorageEngine *storage_engine;

    Time_zone *time_zone;

    MY_LOCALE *locale_value;

  } save_result;

  LEX_STRING base;			/* for structs */

  set_var(sql_var_t type_arg, sys_var *var_arg,

          const LEX_STRING *base_name_arg, Item *value_arg);

  int check(Session *session);

  int update(Session *session);

};

/* User variables like @my_own_variable */

class set_var_user: public set_var_base

{

  Item_func_set_user_var *user_var_item;

public:

  set_var_user(Item_func_set_user_var *item) :

    user_var_item(item)

  {}

  int check(Session *session);

  int update(Session *session);

};

int sql_set_variables(Session *session, List<set_var_base> *var_list);

} /* namespace drizzled */

#endif /* DRIZZLED_SET_VAR_H */