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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 heap handler */
#include <heap.h>
class ha_heap: public handler
{
HP_INFO *file;
public:
ha_heap(TABLE *table): handler(table), file(0) {}
~ha_heap() {}
const char *table_type() const { return "HEAP"; }
const char *index_type(uint inx)
{
return ((table->key_info[inx].algorithm == HA_KEY_ALG_BTREE) ? "BTREE" :
"HASH");
}
const char **bas_ext() const;
ulong table_flags() const
{
return (HA_READ_RND_SAME | HA_NO_INDEX | HA_KEYPOS_TO_RNDPOS |
HA_NO_BLOBS | HA_NULL_KEY | HA_REC_NOT_IN_SEQ);
}
ulong index_flags(uint inx) const
{
return ((table->key_info[inx].algorithm == HA_KEY_ALG_BTREE) ?
(HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER) :
(HA_ONLY_WHOLE_INDEX | HA_WRONG_ASCII_ORDER |
HA_NOT_READ_PREFIX_LAST));
}
uint max_record_length() const { return HA_MAX_REC_LENGTH; }
uint max_keys() const { return MAX_KEY; }
uint max_key_parts() const { return MAX_REF_PARTS; }
uint max_key_length() const { return HA_MAX_REC_LENGTH; }
double scan_time() { return (double) (records+deleted) / 20.0+10; }
double read_time(uint index, uint ranges, ha_rows rows)
{ return (double) rows / 20.0+1; }
virtual bool fast_key_read() { return 1;}
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);
longlong get_auto_increment();
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 rnd_init(bool scan=1);
int rnd_next(byte *buf);
int rnd_pos(byte * buf, byte *pos);
void position(const byte *record);
void info(uint);
int extra(enum ha_extra_function operation);
int reset(void);
int external_lock(THD *thd, int lock_type);
int delete_all_rows(void);
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);
int delete_table(const char *from);
int rename_table(const char * from, const char * to);
int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
void update_create_info(HA_CREATE_INFO *create_info);
THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
enum thr_lock_type lock_type);
};
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