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/* Copyright (C) 2000,2004 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; 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 for the the heap handler */
#include <heap.h>
class ha_heap: public handler
{
HP_INFO *file;
key_map btree_keys;
/* number of records changed since last statistics update */
uint records_changed;
uint key_stat_version;
public:
ha_heap(TABLE *table);
~ha_heap() {}
const char *table_type() const
{
return (table->in_use->variables.sql_mode & MODE_MYSQL323) ?
"HEAP" : "MEMORY";
}
const char *index_type(uint inx)
{
return ((table->key_info[inx].algorithm == HA_KEY_ALG_BTREE) ? "BTREE" :
"HASH");
}
/* Rows also use a fixed-size format */
enum row_type get_row_type() const { return ROW_TYPE_FIXED; }
const char **bas_ext() const;
ulong table_flags() const
{
return (HA_FAST_KEY_READ | HA_NO_BLOBS | HA_NULL_IN_KEY |
HA_REC_NOT_IN_SEQ | 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_BTREE) ?
HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER | HA_READ_RANGE :
HA_ONLY_WHOLE_INDEX);
}
const key_map *keys_to_use_for_scanning() { return &btree_keys; }
uint max_supported_keys() const { return MAX_KEY; }
uint max_supported_key_part_length() const { return MAX_KEY_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; }
int open(const char *name, int mode, uint test_if_locked);
int close(void);
void set_keys_for_scanning(void);
int write_row(byte * buf);
int update_row(const byte * old_data, byte * new_data);
int delete_row(const byte * buf);
ulonglong 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);
int rnd_next(byte *buf);
int rnd_pos(byte * buf, byte *pos);
void position(const byte *record);
int info(uint);
int extra(enum ha_extra_function operation);
int external_lock(THD *thd, int lock_type);
int delete_all_rows(void);
int disable_indexes(uint mode);
int enable_indexes(uint mode);
int indexes_are_disabled(void);
ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
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);
int cmp_ref(const byte *ref1, const byte *ref2)
{
HEAP_PTR ptr1=*(HEAP_PTR*)ref1;
HEAP_PTR ptr2=*(HEAP_PTR*)ref2;
return ptr1 < ptr2? -1 : (ptr1 > ptr2? 1 : 0);
}
private:
void update_key_stats();
};
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