/* 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 */ /* Definitions for parameters to do with handler-routines */ #ifdef __GNUC__ #pragma interface /* gcc class implementation */ #endif #include <ft_global.h> #include <keycache.h> #ifndef NO_HASH #define NO_HASH /* Not yet implemented */ #endif #if defined(HAVE_BERKELEY_DB) || defined(HAVE_INNOBASE_DB) #define USING_TRANSACTIONS #endif // the following is for checking tables #define HA_ADMIN_ALREADY_DONE 1 #define HA_ADMIN_OK 0 #define HA_ADMIN_NOT_IMPLEMENTED -1 #define HA_ADMIN_FAILED -2 #define HA_ADMIN_CORRUPT -3 #define HA_ADMIN_INTERNAL_ERROR -4 #define HA_ADMIN_INVALID -5 /* Bits in table_flags() to show what database can do */ #define HA_READ_RND_SAME 1 /* Read RND-record to KEY-record (To update with RND-read) */ #define HA_KEYPOS_TO_RNDPOS 2 /* ha_info gives pos to record */ #define HA_TABLE_SCAN_ON_INDEX 4 /* No separate data/index file */ #define HA_REC_NOT_IN_SEQ 8 /* ha_info don't return recnumber; It returns a position to ha_r_rnd */ #define HA_HAS_GEOMETRY (1 << 4) #define HA_NO_INDEX (1 << 5) /* No index needed for next/prev */ #define HA_KEY_READ_WRONG_STR (1 << 6) /* keyread returns converted strings */ #define HA_NULL_KEY (1 << 7) /* One can have keys with NULL */ #define HA_DUPP_POS (1 << 8) /* ha_position() gives dupp row */ #define HA_NO_BLOBS (1 << 9) /* Doesn't support blobs */ #define HA_BLOB_KEY (1 << 10) /* key on blob */ #define HA_AUTO_PART_KEY (1 << 11) #define HA_REQUIRE_PRIMARY_KEY (1 << 12) #define HA_NOT_EXACT_COUNT (1 << 13) #define HA_NO_WRITE_DELAYED (1 << 14) #define HA_PRIMARY_KEY_IN_READ_INDEX (1 << 15) #define HA_DROP_BEFORE_CREATE (1 << 16) #define HA_NOT_READ_AFTER_KEY (1 << 17) #define HA_NOT_DELETE_WITH_CACHE (1 << 18) #define HA_NO_TEMP_TABLES (1 << 19) #define HA_NO_PREFIX_CHAR_KEYS (1 << 20) #define HA_CAN_FULLTEXT (1 << 21) #define HA_CAN_SQL_HANDLER (1 << 22) #define HA_NO_AUTO_INCREMENT (1 << 23) #define HA_HAS_CHECKSUM (1 << 24) /* Next record gives next record according last record read (even if database is updated after read). Not used at this point. */ #define HA_LASTKEY_ORDER (1 << 25) /* bits in index_flags(index_number) for what you can do with index */ #define HA_WRONG_ASCII_ORDER 1 /* Can't use sorting through key */ #define HA_READ_NEXT 2 /* Read next record with same key */ #define HA_READ_PREV 4 /* Read prev. record with same key */ #define HA_READ_ORDER 8 /* Read through record-keys in order */ #define HA_ONLY_WHOLE_INDEX 16 /* Can't use part key searches */ #define HA_NOT_READ_PREFIX_LAST 32 /* No support for index_read_last() */ #define HA_KEY_READ_ONLY 64 /* Support HA_EXTRA_KEYREAD */ /* Parameters for open() (in register form->filestat) HA_GET_INFO does an implicit HA_ABORT_IF_LOCKED */ #define HA_OPEN_KEYFILE 1 #define HA_OPEN_RNDFILE 2 #define HA_GET_INDEX 4 #define HA_GET_INFO 8 /* do a ha_info() after open */ #define HA_READ_ONLY 16 /* File opened as readonly */ /* Try readonly if can't open with read and write */ #define HA_TRY_READ_ONLY 32 #define HA_WAIT_IF_LOCKED 64 /* Wait if locked on open */ #define HA_ABORT_IF_LOCKED 128 /* skip if locked on open.*/ #define HA_BLOCK_LOCK 256 /* unlock when reading some records */ #define HA_OPEN_TEMPORARY 512 /* Errors on write which is recoverable (Key exist) */ #define HA_WRITE_SKIP 121 /* Duplicate key on write */ #define HA_READ_CHECK 123 /* Update with is recoverable */ #define HA_CANT_DO_THAT 131 /* Databasehandler can't do it */ /* Some key definitions */ #define HA_KEY_NULL_LENGTH 1 #define HA_KEY_BLOB_LENGTH 2 #define HA_LEX_CREATE_TMP_TABLE 1 #define HA_LEX_CREATE_IF_NOT_EXISTS 2 #define HA_OPTION_NO_CHECKSUM (1L << 17) #define HA_OPTION_NO_DELAY_KEY_WRITE (1L << 18) #define HA_MAX_REC_LENGTH 65535 /* Table caching type */ #define HA_CACHE_TBL_NONTRANSACT 0 #define HA_CACHE_TBL_ASKTRANSACT 1 #define HA_CACHE_TBL_TRANSACT 2 enum db_type { DB_TYPE_UNKNOWN=0,DB_TYPE_DIAB_ISAM=1, DB_TYPE_HASH,DB_TYPE_MISAM,DB_TYPE_PISAM, DB_TYPE_RMS_ISAM, DB_TYPE_HEAP, DB_TYPE_ISAM, DB_TYPE_MRG_ISAM, DB_TYPE_MYISAM, DB_TYPE_MRG_MYISAM, DB_TYPE_BERKELEY_DB, DB_TYPE_INNODB, DB_TYPE_GEMINI, DB_TYPE_DEFAULT }; struct show_table_type_st { const char *type; SHOW_COMP_OPTION *value; const char *comment; enum db_type db_type; }; enum row_type { ROW_TYPE_NOT_USED=-1, ROW_TYPE_DEFAULT, ROW_TYPE_FIXED, ROW_TYPE_DYNAMIC, ROW_TYPE_COMPRESSED}; /* struct to hold information about the table that should be created */ /* Bits in used_fields */ #define HA_CREATE_USED_AUTO 1 #define HA_CREATE_USED_RAID 2 #define HA_CREATE_USED_UNION 4 #define HA_CREATE_USED_INSERT_METHOD 8 #define HA_CREATE_USED_MIN_ROWS 16 #define HA_CREATE_USED_MAX_ROWS 32 #define HA_CREATE_USED_AVG_ROW_LENGTH 64 #define HA_CREATE_USED_PACK_KEYS 128 #define HA_CREATE_USED_CHARSET 256 #define HA_CREATE_USED_DEFAULT_CHARSET 512 typedef struct st_thd_trans { void *bdb_tid; void *innobase_tid; bool innodb_active_trans; } THD_TRANS; enum enum_tx_isolation { ISO_READ_UNCOMMITTED, ISO_READ_COMMITTED, ISO_REPEATABLE_READ, ISO_SERIALIZABLE}; typedef struct st_ha_create_information { CHARSET_INFO *table_charset, *default_table_charset; char *comment,*password; char *data_file_name, *index_file_name; ulonglong max_rows,min_rows; ulonglong auto_increment_value; ulong table_options; ulong avg_row_length; ulong raid_chunksize; ulong used_fields; SQL_LIST merge_list; enum db_type db_type; enum row_type row_type; uint options; /* OR of HA_CREATE_ options */ uint raid_type,raid_chunks; uint merge_insert_method; bool table_existed; /* 1 in create if table existed */ } HA_CREATE_INFO; /* The handler for a table type. Will be included in the TABLE structure */ struct st_table; typedef struct st_table TABLE; typedef struct st_ha_check_opt { ulong sort_buffer_size; uint flags; /* isam layer flags (e.g. for myisamchk) */ uint sql_flags; /* sql layer flags - for something myisamchk cannot do */ KEY_CACHE *key_cache; /* new key cache when changing key cache */ void init(); } HA_CHECK_OPT; class handler :public Sql_alloc { protected: struct st_table *table; /* The table definition */ public: byte *ref; /* Pointer to current row */ byte *dupp_ref; /* Pointer to dupp row */ ulonglong data_file_length; /* Length off data file */ ulonglong max_data_file_length; /* Length off data file */ ulonglong index_file_length; ulonglong max_index_file_length; ulonglong delete_length; /* Free bytes */ ulonglong auto_increment_value; ha_rows records; /* Records in table */ ha_rows deleted; /* Deleted records */ ulong raid_chunksize; ulong mean_rec_length; /* physical reclength */ time_t create_time; /* When table was created */ time_t check_time; time_t update_time; uint errkey; /* Last dup key */ uint sortkey, key_used_on_scan; uint active_index; /* Length of ref (1-8 or the clustered key length) */ uint ref_length; uint block_size; /* index block size */ uint raid_type,raid_chunks; FT_INFO *ft_handler; bool auto_increment_column_changed; handler(TABLE *table_arg) :table(table_arg), ref(0), data_file_length(0), max_data_file_length(0), index_file_length(0), delete_length(0), auto_increment_value(0), records(0), deleted(0), mean_rec_length(0), create_time(0), check_time(0), update_time(0), key_used_on_scan(MAX_KEY), active_index(MAX_REF_PARTS), ref_length(sizeof(my_off_t)), block_size(0), raid_type(0), ft_handler(0) {} virtual ~handler(void) {} int ha_open(const char *name, int mode, int test_if_locked); void update_timestamp(byte *record); void update_auto_increment(); virtual void print_error(int error, myf errflag); uint get_dup_key(int error); void change_table_ptr(TABLE *table_arg) { table=table_arg; } virtual double scan_time() { return ulonglong2double(data_file_length) / IO_SIZE + 2; } virtual double read_time(uint index, uint ranges, ha_rows rows) { return rows2double(ranges+rows); } virtual bool fast_key_read() { return 0;} virtual const key_map *keys_to_use_for_scanning() { return &key_map_empty; } virtual bool has_transactions(){ return 0;} virtual uint extra_rec_buf_length() { return 0; } virtual ha_rows estimate_number_of_rows() { return records+EXTRA_RECORDS; } virtual const char *index_type(uint key_number) { return "";} virtual int index_init(uint idx) { active_index=idx; return 0;} virtual int index_end() {return 0; } uint get_index(void) const { return active_index; } virtual int open(const char *name, int mode, uint test_if_locked)=0; virtual void initialize(void) {} virtual int close(void)=0; virtual int write_row(byte * buf)=0; virtual int update_row(const byte * old_data, byte * new_data)=0; virtual int delete_row(const byte * buf)=0; virtual int index_read(byte * buf, const byte * key, uint key_len, enum ha_rkey_function find_flag)=0; virtual int index_read_idx(byte * buf, uint index, const byte * key, uint key_len, enum ha_rkey_function find_flag)=0; virtual int index_next(byte * buf)=0; virtual int index_prev(byte * buf)=0; virtual int index_first(byte * buf)=0; virtual int index_last(byte * buf)=0; virtual int index_next_same(byte *buf, const byte *key, uint keylen); virtual int index_read_last(byte * buf, const byte * key, uint key_len) { return (my_errno=HA_ERR_WRONG_COMMAND); } virtual int ft_init() { return -1; } virtual FT_INFO *ft_init_ext(uint flags,uint inx,const byte *key, uint keylen) { return NULL; } virtual int ft_read(byte *buf) { return -1; } virtual int rnd_init(bool scan=1)=0; virtual int rnd_end() { return 0; } virtual int rnd_next(byte *buf)=0; virtual int rnd_pos(byte * buf, byte *pos)=0; virtual int read_first_row(byte *buf, uint primary_key); virtual int restart_rnd_next(byte *buf, byte *pos); virtual 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) { return (ha_rows) 10; } virtual void position(const byte *record)=0; virtual my_off_t row_position() { return HA_OFFSET_ERROR; } virtual void info(uint)=0; virtual int extra(enum ha_extra_function operation)=0; virtual int extra_opt(enum ha_extra_function operation, ulong cache_size) { return extra(operation); } virtual int reset()=0; virtual int external_lock(THD *thd, int lock_type)=0; virtual void unlock_row() {} virtual int start_stmt(THD *thd) {return 0;} virtual int delete_all_rows(); virtual longlong get_auto_increment(); virtual void update_create_info(HA_CREATE_INFO *create_info) {} virtual int check(THD* thd, HA_CHECK_OPT* check_opt ); virtual int repair(THD* thd, HA_CHECK_OPT* check_opt); virtual bool check_and_repair(THD *thd) {return 1;} virtual int optimize(THD* thd,HA_CHECK_OPT* check_opt); virtual int analyze(THD* thd, HA_CHECK_OPT* check_opt); virtual int assign_to_keycache(THD* thd, HA_CHECK_OPT* check_opt); virtual int preload_keys(THD* thd, HA_CHECK_OPT* check_opt); virtual int backup(THD* thd, HA_CHECK_OPT* check_opt); /* restore assumes .frm file must exist, and that generate_table() has been called; It will just copy the data file and run repair. */ virtual int restore(THD* thd, HA_CHECK_OPT* check_opt); virtual int dump(THD* thd, int fd = -1) { return ER_DUMP_NOT_IMPLEMENTED; } virtual void deactivate_non_unique_index(ha_rows rows) {} virtual bool activate_all_index(THD *thd) {return 0;} virtual int discard_or_import_tablespace(my_bool discard) {return -1;} // not implemented by default virtual int net_read_dump(NET* net) { return ER_DUMP_NOT_IMPLEMENTED; } virtual char *update_table_comment(const char * comment) { return (char*) comment;} virtual void append_create_info(String *packet) {} virtual char* get_foreign_key_create_info() { return(NULL);} /* gets foreign key create string from InnoDB */ virtual void init_table_handle_for_HANDLER() { return; } /* prepare InnoDB for HANDLER */ virtual void free_foreign_key_create_info(char* str) {} /* The following can be called without an open handler */ virtual const char *table_type() const =0; virtual const char **bas_ext() const =0; virtual ulong table_flags(void) const =0; virtual ulong index_flags(uint idx) const { return (HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER | HA_KEY_READ_ONLY); } virtual uint max_record_length() const =0; virtual uint max_keys() const =0; virtual uint max_key_parts() const =0; virtual uint max_key_length()const =0; virtual uint max_key_part_length() { return 255; } virtual uint min_record_length(uint options) const { return 1; } virtual bool low_byte_first() const { return 1; } virtual uint checksum() const { return 0; } virtual bool is_crashed() const { return 0; } virtual bool auto_repair() const { return 0; } virtual int rename_table(const char *from, const char *to); virtual int delete_table(const char *name); virtual int create(const char *name, TABLE *form, HA_CREATE_INFO *info)=0; virtual uint lock_count(void) const { return 1; } virtual THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to, enum thr_lock_type lock_type)=0; /* Type of table for caching query */ virtual uint8 table_cache_type() { return HA_CACHE_TBL_NONTRANSACT; } /* Is query with this table cachable (have sense only for ASKTRANSACT tables) */ static bool caching_allowed(THD* thd, char* table_key, uint key_length, uint8 cahe_type); }; /* Some extern variables used with handlers */ extern struct show_table_type_st sys_table_types[]; extern const char *ha_row_type[]; extern TYPELIB tx_isolation_typelib; /* Wrapper functions */ #define ha_commit_stmt(thd) (ha_commit_trans((thd), &((thd)->transaction.stmt))) #define ha_rollback_stmt(thd) (ha_rollback_trans((thd), &((thd)->transaction.stmt))) #define ha_commit(thd) (ha_commit_trans((thd), &((thd)->transaction.all))) #define ha_rollback(thd) (ha_rollback_trans((thd), &((thd)->transaction.all))) #define ha_supports_generate(T) (T != DB_TYPE_INNODB) enum db_type ha_resolve_by_name(const char *name, uint namelen); const char *ha_get_table_type(enum db_type db_type); handler *get_new_handler(TABLE *table, enum db_type db_type); my_off_t ha_get_ptr(byte *ptr, uint pack_length); void ha_store_ptr(byte *buff, uint pack_length, my_off_t pos); int ha_init(void); int ha_panic(enum ha_panic_function flag); void ha_close_connection(THD* thd); enum db_type ha_checktype(enum db_type database_type); int ha_create_table(const char *name, HA_CREATE_INFO *create_info, bool update_create_info); int ha_delete_table(enum db_type db_type, const char *path); void ha_drop_database(char* path); int ha_init_key_cache(const char *name, KEY_CACHE *key_cache); int ha_resize_key_cache(KEY_CACHE *key_cache); int ha_change_key_cache_param(KEY_CACHE *key_cache); int ha_end_key_cache(KEY_CACHE *key_cache); int ha_start_stmt(THD *thd); int ha_report_binlog_offset_and_commit(THD *thd, char *log_file_name, my_off_t end_offset); int ha_commit_complete(THD *thd); int ha_release_temporary_latches(THD *thd); int ha_commit_trans(THD *thd, THD_TRANS *trans); int ha_rollback_trans(THD *thd, THD_TRANS *trans); int ha_rollback_to_savepoint(THD *thd, char *savepoint_name); int ha_savepoint(THD *thd, char *savepoint_name); int ha_autocommit_or_rollback(THD *thd, int error); void ha_set_spin_retries(uint retries); bool ha_flush_logs(void); int ha_recovery_logging(THD *thd, bool on); int ha_change_key_cache(KEY_CACHE *old_key_cache, KEY_CACHE *new_key_cache);