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/* Copyright (C) 2000-2006 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 */
/* class for the the heap handler */
#ifndef STORAGE_HEAP_HA_HEAP_H
#define STORAGE_HEAP_HA_HEAP_H
#include <drizzled/handler.h>
#include <mysys/thr_lock.h>
typedef struct st_heap_info HP_INFO;
typedef struct st_heap_share HEAP_SHARE;
typedef unsigned char *HEAP_PTR;
class ha_heap: public handler
{
HP_INFO *file;
key_map btree_keys;
/* number of records changed since last statistics update */
uint32_t records_changed;
uint32_t key_stat_version;
bool internal_table;
public:
ha_heap(StorageEngine *engine, TableShare *table);
~ha_heap() {}
handler *clone(MEM_ROOT *mem_root);
const char *index_type(uint32_t inx);
enum row_type get_row_type() const;
uint64_t table_flags() const
{
return (HA_FAST_KEY_READ | HA_NO_BLOBS | HA_NULL_IN_KEY |
HA_REC_NOT_IN_SEQ | HA_NO_TRANSACTIONS |
HA_HAS_RECORDS | HA_STATS_RECORDS_IS_EXACT);
}
uint32_t index_flags(uint32_t inx, uint32_t part, bool all_parts) const;
const key_map *keys_to_use_for_scanning() { return &btree_keys; }
uint32_t max_supported_keys() const { return MAX_KEY; }
uint32_t max_supported_key_part_length() const { return MAX_KEY_LENGTH; }
double scan_time()
{ return (double) (stats.records+stats.deleted) / 20.0+10; }
double read_time(uint32_t, uint32_t,
ha_rows rows)
{ return (double) rows / 20.0+1; }
int open(const char *name, int mode, uint32_t test_if_locked);
int close(void);
void set_keys_for_scanning(void);
int write_row(unsigned char * buf);
int update_row(const unsigned char * old_data, unsigned char * new_data);
int delete_row(const unsigned char * buf);
virtual void get_auto_increment(uint64_t offset, uint64_t increment,
uint64_t nb_desired_values,
uint64_t *first_value,
uint64_t *nb_reserved_values);
int index_read_map(unsigned char * buf, const unsigned char * key,
key_part_map keypart_map,
enum ha_rkey_function find_flag);
int index_read_last_map(unsigned char *buf, const unsigned char *key,
key_part_map keypart_map);
int index_read_idx_map(unsigned char * buf, uint32_t index,
const unsigned char * key,
key_part_map keypart_map,
enum ha_rkey_function find_flag);
int index_next(unsigned char * buf);
int index_prev(unsigned char * buf);
int index_first(unsigned char * buf);
int index_last(unsigned char * buf);
int rnd_init(bool scan);
int rnd_next(unsigned char *buf);
int rnd_pos(unsigned char * buf, unsigned char *pos);
void position(const unsigned char *record);
int info(uint);
int extra(enum ha_extra_function operation);
int reset();
int external_lock(Session *session, int lock_type);
int delete_all_rows(void);
int disable_indexes(uint32_t mode);
int enable_indexes(uint32_t mode);
int indexes_are_disabled(void);
ha_rows records_in_range(uint32_t inx, key_range *min_key, key_range *max_key);
void drop_table(const char *name);
void update_create_info(HA_CREATE_INFO *create_info);
THR_LOCK_DATA **store_lock(Session *session, THR_LOCK_DATA **to,
enum thr_lock_type lock_type);
int cmp_ref(const unsigned char *ref1, const unsigned char *ref2);
private:
void update_key_stats();
};
#endif /* STORAGE_HEAP_HA_HEAP_H */
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