/* 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 #ifndef NO_HASH #define NO_HASH /* Not yet implemented */ #endif // the following is for checking tables #define HA_CHECK_OK 0 #define HA_CHECK_NOT_IMPLEMENTED -1 #define HA_CHECK_CORRUPT -2 #define HA_CHECK_INTERNAL_ERROR -3 #define HA_REPAIR_OK 0 #define HA_REPAIR_NOT_IMPLEMENTED -1 #define HA_REPAIR_FAILED -2 #define HA_REPAIR_INTERNAL_ERROR -3 #define HA_OPTIMIZE_OK 0 #define HA_OPTIMIZE_NOT_IMPLEMENTED -1 #define HA_OPTIMIZE_FAILED -2 #define HA_OPTIMIZE_INTERNAL_ERROR -3 #define HA_ANALYZE_OK 0 #define HA_ANALYZE_NOT_IMPLEMENTED -1 #define HA_ANALYZE_FAILED -2 #define HA_ANALYZE_INTERNAL_ERROR -3 /* Bits in bas_flag to show what database can do */ #define HA_READ_NEXT 1 /* Read next record with same key */ #define HA_READ_PREV 2 /* Read prev. record with same key */ #define HA_READ_ORDER 4 /* Read through record-keys in order */ #define HA_READ_RND_SAME 8 /* Read RND-record to KEY-record (To update with RND-read) */ #define HA_KEYPOS_TO_RNDPOS 16 /* ha_info gives pos to record */ #define HA_LASTKEY_ORDER 32 /* Next record gives next record according last record read (even if database is updated after read) */ #define HA_REC_NOT_IN_SEQ 64 /* ha_info don't return recnumber; It returns a position to ha_r_rnd */ #define HA_BINARY_KEYS 128 /* Keys must be exact */ #define HA_RSAME_NO_INDEX 256 /* RSAME can't restore index */ #define HA_WRONG_ASCII_ORDER 512 /* Can't use sorting through key */ #define HA_HAVE_KEY_READ_ONLY 1024 /* Can read only keys (no record) */ #define HA_READ_NOT_EXACT_KEY 2048 /* Can read record after/before key */ #define HA_NO_INDEX 4096 /* No index needed for next/prev */ #define HA_LONGLONG_KEYS 8192 /* Can have longlong as key */ #define HA_KEY_READ_WRONG_STR 16384 /* keyread returns converted strings */ #define HA_NULL_KEY 32768 /* One can have keys with NULL */ #define HA_DUPP_POS 65536 /* ha_position() gives dupp row */ #define HA_NO_BLOBS 131072 /* Doesn't support blobs */ #define HA_BLOB_KEY (HA_NO_BLOBS*2) /* key on blob */ #define HA_AUTO_PART_KEY (HA_BLOB_KEY*2) #define HA_REQUIRE_PRIMARY_KEY (HA_AUTO_PART_KEY*2) #define HA_NOT_EXACT_COUNT (HA_REQUIRE_PRIMARY_KEY*2) #define HA_NO_WRITE_DELAYED (HA_NOT_EXACT_COUNT*2) #define HA_PRIMARY_KEY_IN_READ_INDEX (HA_NO_WRITE_DELAYED*2) #define HA_DROP_BEFORE_CREATE (HA_PRIMARY_KEY_IN_READ_INDEX*2) /* Parameters for open() (in register form->filestat) */ /* HA_GET_INFO does a 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 */ #define HA_TRY_READ_ONLY 32 /* Try readonly if can't */ /* open with read and write */ #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 /* Error on write which is recoverable (Key exist) */ #define HA_WRITE_SKIPP 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 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_DEFAULT }; enum row_type { 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 typedef struct st_ha_create_information { ulong table_options; enum db_type db_type; enum row_type row_type; ulong avg_row_length; ulonglong max_rows,min_rows; ulonglong auto_increment_value; char *comment,*password; uint options; /* OR of HA_CREATE_ options */ uint raid_type,raid_chunks; ulong raid_chunksize; bool if_not_exists; ulong used_fields; } HA_CREATE_INFO; /* The handler for a table type. Will be included in the TABLE structure */ struct st_table; typedef struct st_table TABLE; extern ulong myisam_sort_buffer_size; typedef struct st_ha_check_opt { ulong sort_buffer_size; uint flags; bool quick; bool changed_files; inline void init() { flags= 0; quick= 0; sort_buffer_size = myisam_sort_buffer_size; } } HA_CHECK_OPT; class handler :public Sql_alloc { protected: struct st_table *table; /* The table definition */ uint active_index; public: byte *ref; /* Pointer to current row */ byte *dupp_ref; /* Pointer to dupp row */ uint ref_length; /* Length of ref (1-8) */ uint block_size; /* index block size */ ha_rows records; /* Records i datafilen */ ha_rows deleted; /* Deleted records */ 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; uint raid_type,raid_chunks; ulong raid_chunksize; uint errkey; /* Last dup key */ uint sortkey, key_used_on_scan; time_t create_time; /* When table was created */ time_t check_time; time_t update_time; ulong mean_rec_length; /* physical reclength */ double ft_relevance; void *ft_handler; handler(TABLE *table_arg) : table(table_arg),active_index(MAX_REF_PARTS), ref(0),ref_length(sizeof(my_off_t)), block_size(0),records(0),deleted(0), data_file_length(0), max_data_file_length(0), index_file_length(0), delete_length(0), auto_increment_value(0), raid_type(0), key_used_on_scan(MAX_KEY), create_time(0), check_time(0), update_time(0), mean_rec_length(0), ft_relevance(0.0), ft_handler(0) {} virtual ~handler(void) { my_free((char*) ref,MYF(MY_ALLOW_ZERO_PTR)); } int ha_open(const char *name, int mode, int test_if_locked); void update_timestamp(byte *record); void update_auto_increment(); 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 + 1; } virtual double read_time(ha_rows rows) { return rows; } virtual bool fast_key_read() { return 0;} virtual bool has_transactions(){ return 0;} 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, int 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 ft_init(uint inx,const byte *key, uint keylen, bool presort) { return -1; } virtual int ft_read(byte *buf) { return -1; } virtual int ft_close() { 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 rnd_first(byte *buf); 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 reset()=0; virtual int external_lock(THD *thd, int lock_type)=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 int optimize(THD* thd); virtual int analyze(THD* thd); virtual int dump(THD* thd, int fd = -1) { return ER_DUMP_NOT_IMPLEMENTED; } // not implemented by default virtual int net_read_dump(NET* net) { return ER_DUMP_NOT_IMPLEMENTED; } /* 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 option_flag() const =0; 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 min_record_length(uint options) const { return 1; } virtual bool low_byte_first() const { return 1; } 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; }; /* Some extern variables used with handlers */ extern const char *ha_row_type[]; extern TYPELIB ha_table_typelib; 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); 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_key_cache(void); int ha_commit(THD *thd); int ha_rollback(THD *thd); int ha_autocommit_or_rollback(THD *thd, int error); bool ha_flush_logs(void);