Drizzled Public API Documentation

cached_item.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/memory/sql_alloc.h>
00023 #include <drizzled/sql_string.h>
00024 #include <drizzled/type/decimal.h>
00025 
00026 namespace drizzled
00027 {
00028 
00029 class Item;
00030 class Session;
00031 class Field;
00032 
00033 class Cached_item :public memory::SqlAlloc
00034 {
00035 public:
00036   bool null_value;
00037   Cached_item() :null_value(0) {}
00038   virtual bool cmp(void)=0;
00039   virtual ~Cached_item(); /*line -e1509 */
00040 };
00041 
00042 class Cached_item_str :public Cached_item
00043 {
00044   Item *item;
00045   String value,tmp_value;
00046 public:
00047   Cached_item_str(Session *session, Item *arg);
00048   bool cmp(void);
00049   ~Cached_item_str();                           // Deallocate String:s
00050 };
00051 
00052 
00053 class Cached_item_real :public Cached_item
00054 {
00055   Item *item;
00056   double value;
00057 public:
00058   Cached_item_real(Item *item_par) :item(item_par),value(0.0) {}
00059   bool cmp(void);
00060 };
00061 
00062 class Cached_item_int :public Cached_item
00063 {
00064   Item *item;
00065   int64_t value;
00066 public:
00067   Cached_item_int(Item *item_par) :item(item_par),value(0) {}
00068   bool cmp(void);
00069 };
00070 
00071 
00072 class Cached_item_decimal :public Cached_item
00073 {
00074   Item *item;
00075   type::Decimal value;
00076 public:
00077   Cached_item_decimal(Item *item_par);
00078   bool cmp(void);
00079 };
00080 
00081 class Cached_item_field :public Cached_item
00082 {
00083   unsigned char *buff;
00084   Field *field;
00085   uint32_t length;
00086 
00087 public:
00088   Cached_item_field(Field *arg_field);
00089   bool cmp(void);
00090 };
00091 
00092 Cached_item *new_Cached_item(Session *session, Item *item);
00093 
00094 } /* namespace drizzled */
00095