/* 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 | HA_NO_AUTO_INCREMENT); } 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); 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_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); THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to, enum thr_lock_type lock_type); };