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/* Copyright (C) 2005 MySQL 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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
/*
Class definition for the blackhole storage engine
"Dumbest named feature ever"
*/
class ha_blackhole: public handler
{
THR_LOCK_DATA lock; /* MySQL lock */
THR_LOCK thr_lock;
public:
ha_blackhole(TABLE *table_arg);
~ha_blackhole()
{
}
/* The name that will be used for display purposes */
const char *table_type() const { return "BLACKHOLE"; }
/*
The name of the index type that will be used for display
don't implement this method unless you really have indexes
*/
const char *index_type(uint key_number);
const char **bas_ext() const;
ulong table_flags() const
{
return(HA_NULL_IN_KEY | HA_CAN_FULLTEXT | HA_CAN_SQL_HANDLER |
HA_DUPP_POS | HA_CAN_INDEX_BLOBS | HA_AUTO_PART_KEY |
HA_FILE_BASED | HA_CAN_GEOMETRY | HA_READ_RND_SAME |
HA_CAN_INSERT_DELAYED);
}
ulong index_flags(uint inx, uint part, bool all_parts) const
{
return ((table->key_info[inx].algorithm == HA_KEY_ALG_FULLTEXT) ?
0 : HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE |
HA_READ_ORDER | HA_KEYREAD_ONLY);
}
/* The following defines can be increased if necessary */
#define BLACKHOLE_MAX_KEY 64 /* Max allowed keys */
#define BLACKHOLE_MAX_KEY_SEG 16 /* Max segments for key */
#define BLACKHOLE_MAX_KEY_LENGTH 1000
uint max_supported_keys() const { return BLACKHOLE_MAX_KEY; }
uint max_supported_key_length() const { return BLACKHOLE_MAX_KEY_LENGTH; }
uint max_supported_key_part_length() const { return BLACKHOLE_MAX_KEY_LENGTH; }
int open(const char *name, int mode, uint test_if_locked);
int close(void);
int write_row(byte * buf);
int rnd_init(bool scan);
int rnd_next(byte *buf);
int rnd_pos(byte * buf, byte *pos);
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);
void position(const byte *record);
int info(uint flag);
int external_lock(THD *thd, int lock_type);
uint lock_count(void) const;
int create(const char *name, TABLE *table_arg,
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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