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/function/func.h> 00023 00024 namespace drizzled 00025 { 00026 00027 class Item_func_min_max :public Item_func 00028 { 00029 Item_result cmp_type; 00030 String tmp_value; 00031 int cmp_sign; 00032 /* TRUE <=> arguments should be compared in the DATETIME context. */ 00033 bool compare_as_dates; 00034 /* An item used for issuing warnings while string to DATETIME conversion. */ 00035 Item *datetime_item; 00036 Session *session; 00037 protected: 00038 enum_field_types cached_field_type; 00039 public: 00040 Item_func_min_max(List<Item> &list,int cmp_sign_arg) :Item_func(list), 00041 cmp_type(INT_RESULT), cmp_sign(cmp_sign_arg), compare_as_dates(false), 00042 datetime_item(0) {} 00043 double val_real(); 00044 int64_t val_int(); 00045 String *val_str(String *); 00046 type::Decimal *val_decimal(type::Decimal *); 00047 void fix_length_and_dec(); 00048 enum Item_result result_type () const { return cmp_type; } 00049 bool result_as_int64_t() { return compare_as_dates; }; 00050 uint32_t cmp_datetimes(uint64_t *value); 00051 enum_field_types field_type() const { return cached_field_type; } 00052 }; 00053 00054 class Item_func_min :public Item_func_min_max 00055 { 00056 public: 00057 Item_func_min(List<Item> &list) :Item_func_min_max(list,1) {} 00058 const char *func_name() const { return "least"; } 00059 }; 00060 00061 class Item_func_max :public Item_func_min_max 00062 { 00063 public: 00064 Item_func_max(List<Item> &list) :Item_func_min_max(list,-1) {} 00065 const char *func_name() const { return "greatest"; } 00066 }; 00067 00068 } /* namespace drizzled */ 00069