ha_myisam.h 5.18 KB
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/* 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
   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.
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   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.
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   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 */


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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface			/* gcc class implementation */
#endif

/* class for the the myisam handler */

#include <myisam.h>
#include <ft_global.h>

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#define HA_RECOVER_NONE		0	/* No automatic recover */
#define HA_RECOVER_DEFAULT	1	/* Automatic recover active */
#define HA_RECOVER_BACKUP	2	/* Make a backupfile on recover */
#define HA_RECOVER_FORCE	4	/* Recover even if we loose rows */
#define HA_RECOVER_QUICK	8	/* Don't check rows in data file */
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extern ulong myisam_sort_buffer_size;
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extern TYPELIB myisam_recover_typelib;
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extern ulong myisam_recover_options;
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class ha_myisam: public handler
{
  MI_INFO *file;
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  ulong   int_table_flags;
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  char    *data_file_name, *index_file_name;
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  bool can_enable_indexes;
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  int repair(THD *thd, MI_CHECK &param, bool optimize);
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 public:
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  ha_myisam(TABLE *table): handler(table), file(0),
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    int_table_flags(HA_NULL_IN_KEY | HA_CAN_FULLTEXT | HA_CAN_SQL_HANDLER |
		    HA_DUPP_POS | HA_CAN_INDEX_BLOBS | HA_AUTO_PART_KEY |
		    HA_FILE_BASED | HA_CAN_GEOMETRY | HA_READ_RND_SAME |
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                    HA_CAN_INSERT_DELAYED | HA_CAN_BIT_FIELD),
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    can_enable_indexes(1)
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  {}
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  ~ha_myisam() {}
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  const char *table_type() const { return "MyISAM"; }
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  const char *index_type(uint key_number);
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  const char **bas_ext() const;
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  ulong table_flags() const { return int_table_flags; }
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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_FULLTEXT) ?
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            0 : HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE |
            HA_READ_ORDER | HA_KEYREAD_ONLY);
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  }
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  uint max_supported_keys()          const { return MI_MAX_KEY; }
  uint max_supported_key_length()    const { return MI_MAX_KEY_LENGTH; }
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  uint max_supported_key_part_length() const { return MI_MAX_KEY_LENGTH; }
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  uint checksum() const;
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  int open(const char *name, int mode, uint test_if_locked);
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  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);
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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);
  int index_prev(byte * buf);
  int index_first(byte * buf);
  int index_last(byte * buf);
  int index_next_same(byte *buf, const byte *key, uint keylen);
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  int ft_init()
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  {
    if (!ft_handler)
      return 1;
    ft_handler->please->reinit_search(ft_handler);
    return 0;
  }
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  FT_INFO *ft_init_ext(uint flags, uint inx,String *key)
  {
    return ft_init_search(flags,file,inx,
                          (byte *)key->ptr(), key->length(), key->charset(),
                          table->record[0]);
  }
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  int ft_read(byte *buf);
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  int rnd_init(bool scan);
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  int rnd_next(byte *buf);
  int rnd_pos(byte * buf, byte *pos);
  int restart_rnd_next(byte *buf, byte *pos);
  void position(const byte *record);
  void info(uint);
  int extra(enum ha_extra_function operation);
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  int extra_opt(enum ha_extra_function operation, ulong cache_size);
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  int external_lock(THD *thd, int lock_type);
  int delete_all_rows(void);
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  int disable_indexes(uint mode);
  int enable_indexes(uint mode);
  int indexes_are_disabled(void);
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  void start_bulk_insert(ha_rows rows);
  int end_bulk_insert();
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  ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
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  void update_create_info(HA_CREATE_INFO *create_info);
  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);
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  ulonglong get_auto_increment();
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  int rename_table(const char * from, const char * to);
  int delete_table(const char *name);
  int check(THD* thd, HA_CHECK_OPT* check_opt);
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  int analyze(THD* thd,HA_CHECK_OPT* check_opt);
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  int repair(THD* thd, HA_CHECK_OPT* check_opt);
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  bool check_and_repair(THD *thd);
  bool is_crashed() const;
  bool auto_repair() const { return myisam_recover_options != 0; }
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  int optimize(THD* thd, HA_CHECK_OPT* check_opt);
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  int restore(THD* thd, HA_CHECK_OPT* check_opt);
  int backup(THD* thd, HA_CHECK_OPT* check_opt);
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  int assign_to_keycache(THD* thd, HA_CHECK_OPT* check_opt);
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  int preload_keys(THD* thd, HA_CHECK_OPT* check_opt);
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#ifdef HAVE_REPLICATION
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  int dump(THD* thd, int fd);
  int net_read_dump(NET* net);
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#endif
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};