Drizzled Public API Documentation

direct_ref.h

00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2008 Sun Microsystems, Inc.
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; version 2 of the License.
00009  *
00010  *  This program is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *  GNU General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU General Public License
00016  *  along with this program; if not, write to the Free Software
00017  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00018  */
00019 
00020 #pragma once
00021 
00022 #include <drizzled/item/ref.h>
00023 
00024 namespace drizzled
00025 {
00026 
00027 /*
00028   The same as Item_ref, but get value from val_* family of method to get
00029   value of item on which it referred instead of result* family.
00030 */
00031 class Item_direct_ref :public Item_ref
00032 {
00033 public:
00034   Item_direct_ref(Name_resolution_context *context_arg, Item **item,
00035                   const char *table_name_arg,
00036                   const char *field_name_arg,
00037                   bool alias_name_used_arg= false)
00038     :Item_ref(context_arg, item, table_name_arg,
00039               field_name_arg, alias_name_used_arg)
00040   {}
00041   /* Constructor need to process subselect with temporary tables (see Item) */
00042   Item_direct_ref(Session *session, Item_direct_ref *item) : Item_ref(session, item) {}
00043 
00044   double val_real();
00045   int64_t val_int();
00046   String *val_str(String* tmp);
00047   type::Decimal *val_decimal(type::Decimal *);
00048   bool val_bool();
00049   bool is_null();
00050   bool get_date(type::Time &ltime,uint32_t fuzzydate);
00051   virtual Ref_Type ref_type() { return DIRECT_REF; }
00052 };
00053 
00054 } /* namespace drizzled */
00055