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https://github.com/MariaDB/server.git
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108 lines
3.8 KiB
C++
108 lines
3.8 KiB
C++
/* Copyright (C) 2000,2004 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifdef __GNUC__
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#pragma interface /* gcc class implementation */
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#endif
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/* class for the the heap handler */
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#include <heap.h>
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class ha_heap: public handler
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{
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HP_INFO *file;
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key_map btree_keys;
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/* number of records changed since last statistics update */
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uint records_changed;
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public:
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ha_heap(TABLE *table): handler(table), file(0), records_changed(0) {}
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~ha_heap() {}
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const char *table_type() const
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{
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return (table->in_use->variables.sql_mode & MODE_MYSQL323) ?
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"HEAP" : "MEMORY";
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}
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const char *index_type(uint inx)
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{
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return ((table->key_info[inx].algorithm == HA_KEY_ALG_BTREE) ? "BTREE" :
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"HASH");
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}
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const char **bas_ext() const;
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ulong table_flags() const
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{
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return (HA_FAST_KEY_READ | HA_NO_BLOBS | HA_NULL_IN_KEY |
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HA_REC_NOT_IN_SEQ | HA_READ_RND_SAME |
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HA_CAN_INSERT_DELAYED);
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}
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ulong index_flags(uint inx, uint part, bool all_parts) const
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{
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return ((table->key_info[inx].algorithm == HA_KEY_ALG_BTREE) ?
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HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER | HA_READ_RANGE :
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HA_ONLY_WHOLE_INDEX);
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}
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const key_map *keys_to_use_for_scanning() { return &btree_keys; }
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uint max_supported_keys() const { return MAX_KEY; }
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double scan_time() { return (double) (records+deleted) / 20.0+10; }
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double read_time(uint index, uint ranges, ha_rows rows)
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{ return (double) rows / 20.0+1; }
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int open(const char *name, int mode, uint test_if_locked);
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int close(void);
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void set_keys_for_scanning(void);
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int write_row(byte * buf);
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int update_row(const byte * old_data, byte * new_data);
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int delete_row(const byte * buf);
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ulonglong get_auto_increment();
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int index_read(byte * buf, const byte * key,
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uint key_len, enum ha_rkey_function find_flag);
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int index_read_idx(byte * buf, uint idx, const byte * key,
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uint key_len, enum ha_rkey_function find_flag);
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int index_read_last(byte * buf, const byte * key, uint key_len);
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int index_next(byte * buf);
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int index_prev(byte * buf);
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int index_first(byte * buf);
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int index_last(byte * buf);
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int rnd_init(bool scan);
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int rnd_next(byte *buf);
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int rnd_pos(byte * buf, byte *pos);
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void position(const byte *record);
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void info(uint);
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int extra(enum ha_extra_function operation);
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int external_lock(THD *thd, int lock_type);
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int delete_all_rows(void);
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int disable_indexes(uint mode);
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int enable_indexes(uint mode);
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int indexes_are_disabled(void);
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ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
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int delete_table(const char *from);
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int rename_table(const char * from, const char * to);
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int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
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void update_create_info(HA_CREATE_INFO *create_info);
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THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
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enum thr_lock_type lock_type);
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int cmp_ref(const byte *ref1, const byte *ref2)
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{
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HEAP_PTR ptr1=*(HEAP_PTR*)ref1;
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HEAP_PTR ptr2=*(HEAP_PTR*)ref2;
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return ptr1 < ptr2? -1 : (ptr1 > ptr2? 1 : 0);
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}
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private:
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void update_key_stats();
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};
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