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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_FOREIGN_KEY_H
#define DRIZZLED_FOREIGN_KEY_H
#include <drizzled/sql_alloc.h>
#include <drizzled/key.h>
#include <drizzled/sql_list.h>
class Item;
class Table_ident;
typedef struct st_mem_root MEM_ROOT;
class Foreign_key: public Key {
public:
enum fk_match_opt
{
FK_MATCH_UNDEF,
FK_MATCH_FULL,
FK_MATCH_PARTIAL,
FK_MATCH_SIMPLE
};
enum fk_option
{
FK_OPTION_UNDEF,
FK_OPTION_RESTRICT,
FK_OPTION_CASCADE,
FK_OPTION_SET_NULL,
FK_OPTION_NO_ACTION,
FK_OPTION_DEFAULT
};
Table_ident *ref_table;
List<Key_part_spec> ref_columns;
uint32_t delete_opt, update_opt, match_opt;
Foreign_key(const LEX_STRING &name_arg,
List<Key_part_spec> &cols,
Table_ident *table,
List<Key_part_spec> &ref_cols,
uint32_t delete_opt_arg,
uint32_t update_opt_arg,
uint32_t match_opt_arg) :
Key(FOREIGN_KEY, name_arg, &default_key_create_info, 0, cols), ref_table(table),
ref_columns(ref_cols),
delete_opt(delete_opt_arg),
update_opt(update_opt_arg),
match_opt(match_opt_arg)
{ }
/**
* Constructs an (almost) deep copy of this foreign key. Only those
* elements that are known to never change are not copied.
* If out of memory, a partial copy is returned and an error is set
* in Session.
*/
Foreign_key(const Foreign_key &rhs, MEM_ROOT *mem_root);
/**
* Used to make a clone of this object for ALTER/CREATE TABLE
*
* @see comment for Key_part_spec::clone
*/
virtual Key *clone(MEM_ROOT *mem_root) const
{
return new (mem_root) Foreign_key(*this, mem_root);
}
/* Used to validate foreign key options */
bool validate(List<CreateField> &table_fields);
};
#endif /* DRIZZLED_FOREIGN_KEY_H */
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