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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, 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_ITEM_IDENT_H
#define DRIZZLED_ITEM_IDENT_H
#include <drizzled/item.h>
namespace drizzled
{
class Name_resolution_context;
class TableList;
extern uint32_t lower_case_table_names;
class Item_ident :public Item
{
protected:
/*
We have to store initial values of db_name, table_name and field_name
to be able to restore them during cleanup() because they can be
updated during fix_fields() to values from Field object and life-time
of those is shorter than life-time of Item_field.
*/
const char *orig_db_name;
const char *orig_table_name;
const char *orig_field_name;
public:
Name_resolution_context *context;
const char *db_name;
const char *table_name;
const char *field_name;
bool alias_name_used; /* true if item was resolved against alias */
/*
Cached value of index for this field in table->field array, used by prep.
stmts for speeding up their re-execution. Holds NO_CACHED_FIELD_INDEX
if index value is not known.
*/
uint32_t cached_field_index;
/*
Cached pointer to table which contains this field, used for the same reason
by prep. stmt. too in case then we have not-fully qualified field.
0 - means no cached value.
*/
TableList *cached_table;
Select_Lex *depended_from;
Item_ident(Name_resolution_context *context_arg,
const char *db_name_arg, const char *table_name_arg,
const char *field_name_arg);
Item_ident(Session *session, Item_ident *item);
const char *full_name() const;
void cleanup();
bool remove_dependence_processor(unsigned char * arg);
virtual void print(String *str);
virtual bool change_context_processor(unsigned char *cntx)
{ context= (Name_resolution_context *)cntx; return false; }
friend bool insert_fields(Session *session, Name_resolution_context *context,
const char *db_name,
const char *table_name, List<Item>::iterator *it,
bool any_privileges);
};
class Item_ident_for_show :public Item
{
public:
Field *field;
const char *db_name;
const char *table_name;
Item_ident_for_show(Field *par_field, const char *db_arg,
const char *table_name_arg)
:field(par_field), db_name(db_arg), table_name(table_name_arg)
{}
enum Type type() const { return FIELD_ITEM; }
double val_real();
int64_t val_int();
String *val_str(String *str);
type::Decimal *val_decimal(type::Decimal *dec);
void make_field(SendField *tmp_field);
};
} /* namespace drizzled */
#endif /* DRIZZLED_ITEM_IDENT_H */
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