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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
/* class for the the myisam merge handler */
#include <myisammrg.h>
class ha_myisammrg: public handler
{
MYRG_INFO *file;
public:
ha_myisammrg(TABLE *table): handler(table), file(0) {}
~ha_myisammrg() {}
const char *table_type() const { return "MRG_MyISAM"; }
const char **bas_ext() const;
ulong table_flags() const
{
return (HA_REC_NOT_IN_SEQ | HA_READ_RND_SAME | HA_AUTO_PART_KEY |
HA_KEYPOS_TO_RNDPOS | HA_LASTKEY_ORDER |
HA_NULL_KEY | HA_BLOB_KEY);
}
ulong index_flags(uint inx) const
{
ulong flags=(HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER);
return (flags | ((table->key_info[inx].algorithm == HA_KEY_ALG_FULLTEXT) ?
0 : HA_KEY_READ_ONLY));
}
uint max_record_length() const { return HA_MAX_REC_LENGTH; }
uint max_keys() const { return MI_MAX_KEY; }
uint max_key_parts() const { return MAX_REF_PARTS; }
uint max_key_length() const { return MAX_KEY_LENGTH; }
virtual double scan_time()
{ return ulonglong2double(data_file_length) / IO_SIZE + file->tables; }
int open(const char *name, int mode, uint test_if_locked);
int close(void);
int write_row(byte * buf);
int update_row(const byte * old_data, byte * new_data);
int delete_row(const byte * buf);
int index_read(byte * buf, const byte * key,
uint key_len, enum ha_rkey_function find_flag);
int index_read_idx(byte * buf, uint idx, const byte * key,
uint key_len, enum ha_rkey_function find_flag);
int index_read_last(byte * buf, const byte * key, uint key_len);
int index_next(byte * buf);
int index_prev(byte * buf);
int index_first(byte * buf);
int index_last(byte * buf);
int index_next_same(byte *buf, const byte *key, uint keylen);
int rnd_init(bool scan=1);
int rnd_next(byte *buf);
int rnd_pos(byte * buf, byte *pos);
void position(const byte *record);
ha_rows records_in_range(int inx,
const byte *start_key,uint start_key_len,
enum ha_rkey_function start_search_flag,
const byte *end_key,uint end_key_len,
enum ha_rkey_function end_search_flag);
my_off_t row_position() { return myrg_position(file); }
void info(uint);
int extra(enum ha_extra_function operation);
int extra_opt(enum ha_extra_function operation, ulong cache_size);
int reset(void);
int external_lock(THD *thd, int lock_type);
uint lock_count(void) const;
int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
enum thr_lock_type lock_type);
void update_create_info(HA_CREATE_INFO *create_info);
void append_create_info(String *packet);
MYRG_INFO *myrg_info() { return file; }
};
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