曾与蒿藜同雨露,한때 잡초와 쑥과 함께 비와 이슬을 나누던 곳이 이제는 소나무와 삼나무와 함께 서리와 눈을 견뎌내고 있다.终随松柏到冰霜.かつては雑草やヨモギと共に雨や露を分かち合っていたが、今では松やヒノキと共に霜や雪に耐えている。曾与蒿藜同雨露,Once sharing rain and dew with weeds and wormwood, now enduring frost and snow with pines and cypresses.终随松柏到冰霜.曾与蒿藜同雨露한때 잡초와 쑥과 함께 비와 이슬을 나누던 곳이 이제는 소나무와 삼나무와 함께 서리와 눈을 견뎌내고 있다.,终随松柏到冰霜.譖セ荳手珍阯懷酔髮ィ髴イ�檎サ磯囂譚セ譟丞芦蜀ー髴�曾与蒿藜同雨露,鏇句笌钂胯棞鍚岄洦闇诧紝缁堥殢鏉炬煆鍒板啺闇�终随松柏到冰霜.曾与蒿藜同雨露,한때 잡초와 쑥과 함께 비와 이슬을 나누던 곳이 이제는 소나무와 삼나무와 함께 서리와 눈을 견뎌내고 있다.终随松柏到冰霜.曾与蒿藜同雨露,终随松柏到冰霜.
/*
Copyright (c) 2018, 2019 MariaDB
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 SELECT_HANDLER_INCLUDED
#define SELECT_HANDLER_INCLUDED
#include "mariadb.h"
#include "sql_priv.h"
/**
@class select_handler
This interface class is to be used for execution of select queries
by foreign engines
*/
class select_handler
{
public:
THD *thd;
handlerton *ht;
SELECT_LEX *select; // Select to be excuted
/*
Temporary table where all results should be stored in record[0]
The table has a field for every item from the select_lex::item_list.
The table is actually never filled. Only its record buffer is used.
*/
TABLE *table;
List<Item> result_columns;
bool is_analyze;
bool send_result_set_metadata();
bool send_data();
select_handler(THD *thd_arg, handlerton *ht_arg);
virtual ~select_handler();
int execute();
virtual bool prepare();
static TABLE *create_tmp_table(THD *thd, SELECT_LEX *sel);
protected:
/*
Functions to scan the select result set.
All these returns 0 if ok, error code in case of error.
*/
/* Initialize the process of producing rows of result set */
virtual int init_scan() = 0;
/*
Put the next produced row of the result set in table->record[0]
and return 0. Return HA_ERR_END_OF_FILE if there are no more rows,
return other error number in case of fatal error.
*/
virtual int next_row() = 0;
/* Finish scanning */
virtual int end_scan() = 0;
/* Report errors */
virtual void print_error(int error, myf errflag);
bool send_eof();
};
#endif /* SELECT_HANDLER_INCLUDED */