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MySQL 5.1: mysql/src/5.1-dbg/sql/ha_myisam.h Source File

mysql/src/5.1-dbg/sql/ha_myisam.h

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00001 /* Copyright (C) 2000,2004 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
00002 
00003    This program is free software; you can redistribute it and/or modify
00004    it under the terms of the GNU General Public License as published by
00005    the Free Software Foundation; either version 2 of the License, or
00006    (at your option) any later version.
00007 
00008    This program is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011    GNU General Public License for more details.
00012 
00013    You should have received a copy of the GNU General Public License
00014    along with this program; if not, write to the Free Software
00015    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
00016 
00017 
00018 #ifdef USE_PRAGMA_INTERFACE
00019 #pragma interface                       /* gcc class implementation */
00020 #endif
00021 
00022 /* class for the the myisam handler */
00023 
00024 #include <myisam.h>
00025 #include <ft_global.h>
00026 
00027 #define HA_RECOVER_NONE         0       /* No automatic recover */
00028 #define HA_RECOVER_DEFAULT      1       /* Automatic recover active */
00029 #define HA_RECOVER_BACKUP       2       /* Make a backupfile on recover */
00030 #define HA_RECOVER_FORCE        4       /* Recover even if we loose rows */
00031 #define HA_RECOVER_QUICK        8       /* Don't check rows in data file */
00032 
00033 extern ulong myisam_sort_buffer_size;
00034 extern TYPELIB myisam_recover_typelib;
00035 extern ulong myisam_recover_options;
00036 
00037 class ha_myisam: public handler
00038 {
00039   MI_INFO *file;
00040   ulong   int_table_flags;
00041   char    *data_file_name, *index_file_name;
00042   bool can_enable_indexes;
00043   int repair(THD *thd, MI_CHECK &param, bool optimize);
00044 
00045  public:
00046   ha_myisam(TABLE_SHARE *table_arg);
00047   ~ha_myisam() {}
00048   const char *table_type() const { return "MyISAM"; }
00049   const char *index_type(uint key_number);
00050   const char **bas_ext() const;
00051   ulonglong table_flags() const { return int_table_flags; }
00052   ulong index_flags(uint inx, uint part, bool all_parts) const
00053   {
00054     return ((table_share->key_info[inx].algorithm == HA_KEY_ALG_FULLTEXT) ?
00055             0 : HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE |
00056             HA_READ_ORDER | HA_KEYREAD_ONLY);
00057   }
00058   uint max_supported_keys()          const { return MI_MAX_KEY; }
00059   uint max_supported_key_length()    const { return MI_MAX_KEY_LENGTH; }
00060   uint max_supported_key_part_length() const { return MI_MAX_KEY_LENGTH; }
00061   uint checksum() const;
00062 
00063   virtual bool check_if_locking_is_allowed(uint sql_command,
00064                                            ulong type, TABLE *table,
00065                                            uint count,
00066                                            bool called_by_logger_thread);
00067   int open(const char *name, int mode, uint test_if_locked);
00068   int close(void);
00069   int write_row(byte * buf);
00070   int update_row(const byte * old_data, byte * new_data);
00071   int delete_row(const byte * buf);
00072   int index_read(byte * buf, const byte * key,
00073                  uint key_len, enum ha_rkey_function find_flag);
00074   int index_read_idx(byte * buf, uint idx, const byte * key,
00075                      uint key_len, enum ha_rkey_function find_flag);
00076   int index_read_last(byte * buf, const byte * key, uint key_len);
00077   int index_next(byte * buf);
00078   int index_prev(byte * buf);
00079   int index_first(byte * buf);
00080   int index_last(byte * buf);
00081   int index_next_same(byte *buf, const byte *key, uint keylen);
00082   int ft_init()
00083   {
00084     if (!ft_handler)
00085       return 1;
00086     ft_handler->please->reinit_search(ft_handler);
00087     return 0;
00088   }
00089   FT_INFO *ft_init_ext(uint flags, uint inx,String *key)
00090   {
00091     return ft_init_search(flags,file,inx,
00092                           (byte *)key->ptr(), key->length(), key->charset(),
00093                           table->record[0]);
00094   }
00095   int ft_read(byte *buf);
00096   int rnd_init(bool scan);
00097   int rnd_next(byte *buf);
00098   int rnd_pos(byte * buf, byte *pos);
00099   int restart_rnd_next(byte *buf, byte *pos);
00100   void position(const byte *record);
00101   void info(uint);
00102   int extra(enum ha_extra_function operation);
00103   int extra_opt(enum ha_extra_function operation, ulong cache_size);
00104   int reset(void);
00105   int external_lock(THD *thd, int lock_type);
00106   int delete_all_rows(void);
00107   int disable_indexes(uint mode);
00108   int enable_indexes(uint mode);
00109   int indexes_are_disabled(void);
00110   void start_bulk_insert(ha_rows rows);
00111   int end_bulk_insert();
00112   ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
00113   void update_create_info(HA_CREATE_INFO *create_info);
00114   int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
00115   THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
00116                              enum thr_lock_type lock_type);
00117   virtual void get_auto_increment(ulonglong offset, ulonglong increment,
00118                                   ulonglong nb_desired_values,
00119                                   ulonglong *first_value,
00120                                   ulonglong *nb_reserved_values);
00121   int rename_table(const char * from, const char * to);
00122   int delete_table(const char *name);
00123   int check(THD* thd, HA_CHECK_OPT* check_opt);
00124   int analyze(THD* thd,HA_CHECK_OPT* check_opt);
00125   int repair(THD* thd, HA_CHECK_OPT* check_opt);
00126   bool check_and_repair(THD *thd);
00127   bool is_crashed() const;
00128   bool auto_repair() const { return myisam_recover_options != 0; }
00129   int optimize(THD* thd, HA_CHECK_OPT* check_opt);
00130   int restore(THD* thd, HA_CHECK_OPT* check_opt);
00131   int backup(THD* thd, HA_CHECK_OPT* check_opt);
00132   int assign_to_keycache(THD* thd, HA_CHECK_OPT* check_opt);
00133   int preload_keys(THD* thd, HA_CHECK_OPT* check_opt);
00134   bool check_if_incompatible_data(HA_CREATE_INFO *info, uint table_changes);
00135 #ifdef HAVE_REPLICATION
00136   int dump(THD* thd, int fd);
00137   int net_read_dump(NET* net);
00138 #endif
00139 };
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