ha_heap.h
上传用户:romrleung
上传日期:2022-05-23
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文件大小:4k
- /* 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; 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 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;
- bool key_stats_ok;
- public:
- ha_heap(TABLE *table): handler(table), file(0), records_changed(0),
- key_stats_ok(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_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);
- 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);
- 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 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);
- private:
- void update_key_stats();
- };