/* Copyright (C) 2005 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 */ #ifdef USE_PRAGMA_INTERFACE #pragma interface /* gcc class implementation */ #endif /* Shared structure for correct LOCK operation */ struct st_blackhole_share { THR_LOCK lock; uint use_count; uint table_name_length; char table_name[1]; }; /* Class definition for the blackhole storage engine "Dumbest named feature ever" */ class ha_blackhole: public handler { THR_LOCK_DATA lock; /* MySQL lock */ st_blackhole_share *share; public: ha_blackhole(handlerton *hton, TABLE_SHARE *table_arg); ~ha_blackhole() { } /* The name that will be used for display purposes */ const char *table_type() const { return "BLACKHOLE"; } /* The name of the index type that will be used for display don't implement this method unless you really have indexes */ const char *index_type(uint key_number); const char **bas_ext() const; ulonglong table_flags() const { return(HA_NULL_IN_KEY | HA_CAN_FULLTEXT | HA_CAN_SQL_HANDLER | HA_BINLOG_STMT_CAPABLE | HA_CAN_INDEX_BLOBS | HA_AUTO_PART_KEY | HA_FILE_BASED | HA_CAN_GEOMETRY | HA_CAN_INSERT_DELAYED); } ulong index_flags(uint inx, uint part, bool all_parts) const { return ((table_share->key_info[inx].algorithm == HA_KEY_ALG_FULLTEXT) ? 0 : HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE | HA_READ_ORDER | HA_KEYREAD_ONLY); } /* The following defines can be increased if necessary */ #define BLACKHOLE_MAX_KEY 64 /* Max allowed keys */ #define BLACKHOLE_MAX_KEY_SEG 16 /* Max segments for key */ #define BLACKHOLE_MAX_KEY_LENGTH 1000 uint max_supported_keys() const { return BLACKHOLE_MAX_KEY; } uint max_supported_key_length() const { return BLACKHOLE_MAX_KEY_LENGTH; } uint max_supported_key_part_length() const { return BLACKHOLE_MAX_KEY_LENGTH; } int open(const char *name, int mode, uint test_if_locked); int close(void); int write_row(uchar * buf); int rnd_init(bool scan); int rnd_next(uchar *buf); int rnd_pos(uchar * buf, uchar *pos); int index_read(uchar * buf, const uchar * key, key_part_map keypart_map, enum ha_rkey_function find_flag); int index_read_idx(uchar * buf, uint idx, const uchar * key, key_part_map keypart_map, enum ha_rkey_function find_flag); int index_read_last(uchar * buf, const uchar * key, key_part_map keypart_map); int index_next(uchar * buf); int index_prev(uchar * buf); int index_first(uchar * buf); int index_last(uchar * buf); void position(const uchar *record); int info(uint flag); int external_lock(THD *thd, int lock_type); int create(const char *name, TABLE *table_arg, HA_CREATE_INFO *create_info); THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to, enum thr_lock_type lock_type); };