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mysql/src/5.1-dbg/include/my_base.h

Go to the documentation of this file.

/* Copyright (C) 2000 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; 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 */

/* This file includes constants used with all databases */
/* Author: Michael Widenius */

#ifndef _my_base_h
#define _my_base_h

#ifndef stdin                           /* Included first in handler */
#define CHSIZE_USED
#include <my_global.h>
#include <my_dir.h>                     /* This includes types */
#include <my_sys.h>
#include <m_string.h>
#include <errno.h>

#ifndef EOVERFLOW
#define EOVERFLOW 84
#endif

#if !defined(USE_MY_FUNC) && !defined(THREAD)
#include <my_nosys.h>                   /* For faster code, after test */
#endif  /* USE_MY_FUNC */
#endif  /* stdin */
#include <my_list.h>

/* The following is bits in the flag parameter to ha_open() */

#define HA_OPEN_ABORT_IF_LOCKED         0       /* default */
#define HA_OPEN_WAIT_IF_LOCKED          1
#define HA_OPEN_IGNORE_IF_LOCKED        2
#define HA_OPEN_TMP_TABLE               4       /* Table is a temp table */
#define HA_OPEN_DELAY_KEY_WRITE         8       /* Don't update index  */
#define HA_OPEN_ABORT_IF_CRASHED        16
#define HA_OPEN_FOR_REPAIR              32      /* open even if crashed */
#define HA_OPEN_FROM_SQL_LAYER          64

        /* The following is parameter to ha_rkey() how to use key */

/*
  We define a complete-field prefix of a key value as a prefix where
  the last included field in the prefix contains the full field, not
  just some bytes from the start of the field. A partial-field prefix
  is allowed to contain only a few first bytes from the last included
  field.

  Below HA_READ_KEY_EXACT, ..., HA_READ_BEFORE_KEY can take a
  complete-field prefix of a key value as the search
  key. HA_READ_PREFIX and HA_READ_PREFIX_LAST could also take a
  partial-field prefix, but currently (4.0.10) they are only used with
  complete-field prefixes. MySQL uses a padding trick to implement
  LIKE 'abc%' queries.

  NOTE that in InnoDB HA_READ_PREFIX_LAST will NOT work with a
  partial-field prefix because InnoDB currently strips spaces from the
  end of varchar fields!
*/

enum ha_rkey_function {
  HA_READ_KEY_EXACT,              /* Find first record else error */
  HA_READ_KEY_OR_NEXT,            /* Record or next record */
  HA_READ_KEY_OR_PREV,            /* Record or previous */
  HA_READ_AFTER_KEY,              /* Find next rec. after key-record */
  HA_READ_BEFORE_KEY,             /* Find next rec. before key-record */
  HA_READ_PREFIX,                 /* Key which as same prefix */
  HA_READ_PREFIX_LAST,            /* Last key with the same prefix */
  HA_READ_PREFIX_LAST_OR_PREV,    /* Last or prev key with the same prefix */
  HA_READ_MBR_CONTAIN,
  HA_READ_MBR_INTERSECT,
  HA_READ_MBR_WITHIN,
  HA_READ_MBR_DISJOINT,
  HA_READ_MBR_EQUAL
};

        /* Key algorithm types */

enum ha_key_alg {
  HA_KEY_ALG_UNDEF=     0,              /* Not specified (old file) */
  HA_KEY_ALG_BTREE=     1,              /* B-tree, default one          */
  HA_KEY_ALG_RTREE=     2,              /* R-tree, for spatial searches */
  HA_KEY_ALG_HASH=      3,              /* HASH keys (HEAP tables) */
  HA_KEY_ALG_FULLTEXT=  4               /* FULLTEXT (MyISAM tables) */
};

        /* The following is parameter to ha_extra() */

enum ha_extra_function {
  HA_EXTRA_NORMAL=0,                    /* Optimize for space (def) */
  HA_EXTRA_QUICK=1,                     /* Optimize for speed */
  HA_EXTRA_NOT_USED=2,
  HA_EXTRA_CACHE=3,                     /* Cache record in HA_rrnd() */
  HA_EXTRA_NO_CACHE=4,                  /* End caching of records (def) */
  HA_EXTRA_NO_READCHECK=5,              /* No readcheck on update */
  HA_EXTRA_READCHECK=6,                 /* Use readcheck (def) */
  HA_EXTRA_KEYREAD=7,                   /* Read only key to database */
  HA_EXTRA_NO_KEYREAD=8,                /* Normal read of records (def) */
  HA_EXTRA_NO_USER_CHANGE=9,            /* No user is allowed to write */
  HA_EXTRA_KEY_CACHE=10,
  HA_EXTRA_NO_KEY_CACHE=11,
  HA_EXTRA_WAIT_LOCK=12,                /* Wait until file is avalably (def) */
  HA_EXTRA_NO_WAIT_LOCK=13,             /* If file is locked, return quickly */
  HA_EXTRA_WRITE_CACHE=14,              /* Use write cache in ha_write() */
  HA_EXTRA_FLUSH_CACHE=15,              /* flush write_record_cache */
  HA_EXTRA_NO_KEYS=16,                  /* Remove all update of keys */
  HA_EXTRA_KEYREAD_CHANGE_POS=17,       /* Keyread, but change pos */
                                        /* xxxxchk -r must be used */
  HA_EXTRA_REMEMBER_POS=18,             /* Remember pos for next/prev */
  HA_EXTRA_RESTORE_POS=19,
  HA_EXTRA_REINIT_CACHE=20,             /* init cache from current record */
  HA_EXTRA_FORCE_REOPEN=21,             /* Datafile have changed on disk */
  HA_EXTRA_FLUSH,                       /* Flush tables to disk */
  HA_EXTRA_NO_ROWS,                     /* Don't write rows */
  HA_EXTRA_RESET_STATE,                 /* Reset positions */
  HA_EXTRA_IGNORE_DUP_KEY,              /* Dup keys don't rollback everything*/
  HA_EXTRA_NO_IGNORE_DUP_KEY,
  HA_EXTRA_PREPARE_FOR_DELETE,
  HA_EXTRA_PREPARE_FOR_UPDATE,          /* Remove read cache if problems */
  HA_EXTRA_PRELOAD_BUFFER_SIZE,         /* Set buffer size for preloading */
  /*
    On-the-fly switching between unique and non-unique key inserting.
  */
  HA_EXTRA_CHANGE_KEY_TO_UNIQUE,
  HA_EXTRA_CHANGE_KEY_TO_DUP,
  /*
    When using HA_EXTRA_KEYREAD, overwrite only key member fields and keep 
    other fields intact. When this is off (by default) InnoDB will use memcpy
    to overwrite entire row.
  */
  HA_EXTRA_KEYREAD_PRESERVE_FIELDS,
  HA_EXTRA_MMAP,
  /*
    Ignore if the a tuple is not found, continue processing the
    transaction and ignore that 'row'.  Needed for idempotency
    handling on the slave

    Currently only used by NDB storage engine. Partition handler ignores flag.
  */
  HA_EXTRA_IGNORE_NO_KEY,
  HA_EXTRA_NO_IGNORE_NO_KEY,
  /*
    Mark the table as a log table. For some handlers (e.g. CSV) this results
    in a special locking for the table.
  */
  HA_EXTRA_MARK_AS_LOG_TABLE,
  /*
    Informs handler that write_row() which tries to insert new row into the
    table and encounters some already existing row with same primary/unique
    key can replace old row with new row instead of reporting error (basically
    it informs handler that we do REPLACE instead of simple INSERT).
    Off by default.
  */
  HA_EXTRA_WRITE_CAN_REPLACE,
  HA_EXTRA_WRITE_CANNOT_REPLACE
};

        /* The following is parameter to ha_panic() */

enum ha_panic_function {
  HA_PANIC_CLOSE,                       /* Close all databases */
  HA_PANIC_WRITE,                       /* Unlock and write status */
  HA_PANIC_READ                         /* Lock and read keyinfo */
};

        /* The following is parameter to ha_create(); keytypes */

enum ha_base_keytype {
  HA_KEYTYPE_END=0,
  HA_KEYTYPE_TEXT=1,                    /* Key is sorted as letters */
  HA_KEYTYPE_BINARY=2,                  /* Key is sorted as unsigned chars */
  HA_KEYTYPE_SHORT_INT=3,
  HA_KEYTYPE_LONG_INT=4,
  HA_KEYTYPE_FLOAT=5,
  HA_KEYTYPE_DOUBLE=6,
  HA_KEYTYPE_NUM=7,                     /* Not packed num with pre-space */
  HA_KEYTYPE_USHORT_INT=8,
  HA_KEYTYPE_ULONG_INT=9,
  HA_KEYTYPE_LONGLONG=10,
  HA_KEYTYPE_ULONGLONG=11,
  HA_KEYTYPE_INT24=12,
  HA_KEYTYPE_UINT24=13,
  HA_KEYTYPE_INT8=14,
  /* Varchar (0-255 bytes) with length packed with 1 byte */
  HA_KEYTYPE_VARTEXT1=15,               /* Key is sorted as letters */
  HA_KEYTYPE_VARBINARY1=16,             /* Key is sorted as unsigned chars */
  /* Varchar (0-65535 bytes) with length packed with 2 bytes */
  HA_KEYTYPE_VARTEXT2=17,               /* Key is sorted as letters */
  HA_KEYTYPE_VARBINARY2=18,             /* Key is sorted as unsigned chars */
  HA_KEYTYPE_BIT=19
};

#define HA_MAX_KEYTYPE  31              /* Must be log2-1 */

        /* These flags kan be OR:ed to key-flag */

#define HA_NOSAME                1      /* Set if not dupplicated records */
#define HA_PACK_KEY              2      /* Pack string key to previous key */
#define HA_AUTO_KEY              16
#define HA_BINARY_PACK_KEY       32     /* Packing of all keys to prev key */
#define HA_FULLTEXT             128     /* For full-text search */
#define HA_UNIQUE_CHECK         256     /* Check the key for uniqueness */
#define HA_SPATIAL              1024    /* For spatial search */
#define HA_NULL_ARE_EQUAL       2048    /* NULL in key are cmp as equal */
#define HA_GENERATED_KEY        8192    /* Automaticly generated key */

        /* The combination of the above can be used for key type comparison. */
#define HA_KEYFLAG_MASK (HA_NOSAME | HA_PACK_KEY | HA_AUTO_KEY | \
                         HA_BINARY_PACK_KEY | HA_FULLTEXT | HA_UNIQUE_CHECK | \
                         HA_SPATIAL | HA_NULL_ARE_EQUAL | HA_GENERATED_KEY)

        /* Automatic bits in key-flag */

#define HA_SPACE_PACK_USED       4      /* Test for if SPACE_PACK used */
#define HA_VAR_LENGTH_KEY        8
#define HA_NULL_PART_KEY         64
#define HA_USES_PARSER           16384  /* Fulltext index uses [pre]parser */
#define HA_USES_BLOCK_SIZE       ((uint) 32768)
#define HA_SORT_ALLOWS_SAME      512    /* Intern bit when sorting records */
/*
  Key has a part that can have end space.  If this is an unique key
  we have to handle it differently from other unique keys as we can find
  many matching rows for one key (because end space are not compared)
*/
#define HA_END_SPACE_KEY        4096

        /* These flags can be added to key-seg-flag */

#define HA_SPACE_PACK            1      /* Pack space in key-seg */
#define HA_PART_KEY_SEG          4      /* Used by MySQL for part-key-cols */
#define HA_VAR_LENGTH_PART       8
#define HA_NULL_PART             16
#define HA_BLOB_PART             32
#define HA_SWAP_KEY              64
#define HA_REVERSE_SORT          128    /* Sort key in reverse order */
#define HA_NO_SORT               256 /* do not bother sorting on this keyseg */
/*
  End space in unique/varchar are considered equal. (Like 'a' and 'a ')
  Only needed for internal temporary tables.
*/
#define HA_END_SPACE_ARE_EQUAL   512
#define HA_BIT_PART             1024

        /* optionbits for database */
#define HA_OPTION_PACK_RECORD           1
#define HA_OPTION_PACK_KEYS             2
#define HA_OPTION_COMPRESS_RECORD       4
#define HA_OPTION_LONG_BLOB_PTR         8 /* new ISAM format */
#define HA_OPTION_TMP_TABLE             16
#define HA_OPTION_CHECKSUM              32
#define HA_OPTION_DELAY_KEY_WRITE       64
#define HA_OPTION_NO_PACK_KEYS          128  /* Reserved for MySQL */
#define HA_OPTION_CREATE_FROM_ENGINE    256
#define HA_OPTION_RELIES_ON_SQL_LAYER   512
#define HA_OPTION_TEMP_COMPRESS_RECORD  ((uint) 16384)  /* set by isamchk */
#define HA_OPTION_READ_ONLY_DATA        ((uint) 32768)  /* Set by isamchk */

        /* Bits in flag to create() */

#define HA_DONT_TOUCH_DATA      1       /* Don't empty datafile (isamchk) */
#define HA_PACK_RECORD          2       /* Request packed record format */
#define HA_CREATE_TMP_TABLE     4
#define HA_CREATE_CHECKSUM      8
#define HA_CREATE_DELAY_KEY_WRITE 64
#define HA_CREATE_RELIES_ON_SQL_LAYER 128

/*
  The following flags (OR-ed) are passed to handler::info() method.
  The method copies misc handler information out of the storage engine
  to data structures accessible from MySQL

  Same flags are also passed down to mi_status, myrg_status, etc.
*/

/* this one is not used */
#define HA_STATUS_POS            1
/*
  assuming the table keeps shared actual copy of the 'info' and
  local, possibly outdated copy, the following flag means that
  it should not try to get the actual data (locking the shared structure)
  slightly outdated version will suffice
*/
#define HA_STATUS_NO_LOCK        2
/* update the time of the last modification (in handler::update_time) */
#define HA_STATUS_TIME           4
/*
  update the 'constant' part of the info:
  handler::max_data_file_length, max_index_file_length, create_time
  sortkey, ref_length, block_size, data_file_name, index_file_name.
  handler::table->s->keys_in_use, keys_for_keyread, rec_per_key
*/
#define HA_STATUS_CONST          8
/*
  update the 'variable' part of the info:
  handler::records, deleted, data_file_length, index_file_length,
  delete_length, check_time, mean_rec_length
*/
#define HA_STATUS_VARIABLE      16
/*
  get the information about the key that caused last duplicate value error
  update handler::errkey and handler::dupp_ref
  see handler::get_dup_key()
*/
#define HA_STATUS_ERRKEY        32
/*
  update handler::auto_increment_value
*/
#define HA_STATUS_AUTO          64

        /* Errorcodes given by functions */

/* opt_sum_query() assumes these codes are > 1 */
/* Do not add error numbers before HA_ERR_FIRST. */
/* If necessary to add lower numbers, change HA_ERR_FIRST accordingly. */
#define HA_ERR_FIRST            120 /*Copy first error nr.*/
#define HA_ERR_KEY_NOT_FOUND    120     /* Didn't find key on read or update */
#define HA_ERR_FOUND_DUPP_KEY   121     /* Dupplicate key on write */
#define HA_ERR_RECORD_CHANGED   123     /* Uppdate with is recoverable */
#define HA_ERR_WRONG_INDEX      124     /* Wrong index given to function */
#define HA_ERR_CRASHED          126     /* Indexfile is crashed */
#define HA_ERR_WRONG_IN_RECORD  127     /* Record-file is crashed */
#define HA_ERR_OUT_OF_MEM       128     /* Record-file is crashed */
#define HA_ERR_NOT_A_TABLE      130     /* not a MYI file - no signature */
#define HA_ERR_WRONG_COMMAND    131     /* Command not supported */
#define HA_ERR_OLD_FILE         132     /* old databasfile */
#define HA_ERR_NO_ACTIVE_RECORD 133     /* No record read in update() */
#define HA_ERR_RECORD_DELETED   134     /* A record is not there */
#define HA_ERR_RECORD_FILE_FULL 135     /* No more room in file */
#define HA_ERR_INDEX_FILE_FULL  136     /* No more room in file */
#define HA_ERR_END_OF_FILE      137     /* end in next/prev/first/last */
#define HA_ERR_UNSUPPORTED      138     /* unsupported extension used */
#define HA_ERR_TO_BIG_ROW       139     /* Too big row */
#define HA_WRONG_CREATE_OPTION  140     /* Wrong create option */
#define HA_ERR_FOUND_DUPP_UNIQUE 141    /* Dupplicate unique on write */
#define HA_ERR_UNKNOWN_CHARSET   142    /* Can't open charset */
#define HA_ERR_WRONG_MRG_TABLE_DEF 143    /* conflicting MyISAM tables in MERGE */
#define HA_ERR_CRASHED_ON_REPAIR 144    /* Last (automatic?) repair failed */
#define HA_ERR_CRASHED_ON_USAGE  145    /* Table must be repaired */
#define HA_ERR_LOCK_WAIT_TIMEOUT 146
#define HA_ERR_LOCK_TABLE_FULL   147
#define HA_ERR_READ_ONLY_TRANSACTION 148 /* Updates not allowed */
#define HA_ERR_LOCK_DEADLOCK     149
#define HA_ERR_CANNOT_ADD_FOREIGN 150    /* Cannot add a foreign key constr. */
#define HA_ERR_NO_REFERENCED_ROW 151     /* Cannot add a child row */
#define HA_ERR_ROW_IS_REFERENCED 152     /* Cannot delete a parent row */
#define HA_ERR_NO_SAVEPOINT      153     /* No savepoint with that name */
#define HA_ERR_NON_UNIQUE_BLOCK_SIZE 154 /* Non unique key block size */
#define HA_ERR_NO_SUCH_TABLE     155  /* The table does not exist in engine */
#define HA_ERR_TABLE_EXIST       156  /* The table existed in storage engine */
#define HA_ERR_NO_CONNECTION     157  /* Could not connect to storage engine */
#define HA_ERR_NULL_IN_SPATIAL   158  /* NULLs are not supported in spatial index */
#define HA_ERR_TABLE_DEF_CHANGED 159  /* The table changed in storage engine */
#define HA_ERR_NO_PARTITION_FOUND 160  /* There's no partition in table for
                                          given value */
#define HA_ERR_RBR_LOGGING_FAILED 161  /* Row-based binlogging of row failed */
#define HA_ERR_DROP_INDEX_FK      162  /* Index needed in foreign key constr. */
#define HA_ERR_FOREIGN_DUPLICATE_KEY 163 /* Upholding foreign key constraints
                                            would lead to a duplicate key
                                            error in some other table. */
#define HA_ERR_TABLE_NEEDS_UPGRADE 164  /* The table changed in storage engine */
#define HA_ERR_TABLE_READONLY    165  /* The table is not writable */

#define HA_ERR_LAST              165  /*Copy last error nr.*/
/* Add error numbers before HA_ERR_LAST and change it accordingly. */
#define HA_ERR_ERRORS            (HA_ERR_LAST - HA_ERR_FIRST + 1)

        /* Other constants */

#define HA_NAMELEN 64                   /* Max length of saved filename */
#define NO_SUCH_KEY ((uint)~0)          /* used as a key no. */

        /* Intern constants in databases */

        /* bits in _search */
#define SEARCH_FIND     1
#define SEARCH_NO_FIND  2
#define SEARCH_SAME     4
#define SEARCH_BIGGER   8
#define SEARCH_SMALLER  16
#define SEARCH_SAVE_BUFF        32
#define SEARCH_UPDATE   64
#define SEARCH_PREFIX   128
#define SEARCH_LAST     256
#define MBR_CONTAIN     512
#define MBR_INTERSECT   1024
#define MBR_WITHIN      2048
#define MBR_DISJOINT    4096
#define MBR_EQUAL       8192
#define MBR_DATA        16384
#define SEARCH_NULL_ARE_EQUAL 32768     /* NULL in keys are equal */
#define SEARCH_NULL_ARE_NOT_EQUAL 65536 /* NULL in keys are not equal */

        /* bits in opt_flag */
#define QUICK_USED      1
#define READ_CACHE_USED 2
#define READ_CHECK_USED 4
#define KEY_READ_USED   8
#define WRITE_CACHE_USED 16
#define OPT_NO_ROWS     32

        /* bits in update */
#define HA_STATE_CHANGED        1       /* Database has changed */
#define HA_STATE_AKTIV          2       /* Has a current record */
#define HA_STATE_WRITTEN        4       /* Record is written */
#define HA_STATE_DELETED        8
#define HA_STATE_NEXT_FOUND     16      /* Next found record (record before) */
#define HA_STATE_PREV_FOUND     32      /* Prev found record (record after) */
#define HA_STATE_NO_KEY         64      /* Last read didn't find record */
#define HA_STATE_KEY_CHANGED    128
#define HA_STATE_WRITE_AT_END   256     /* set in _ps_find_writepos */
#define HA_STATE_BUFF_SAVED     512     /* If current keybuff is info->buff */
#define HA_STATE_ROW_CHANGED    1024    /* To invalide ROW cache */
#define HA_STATE_EXTEND_BLOCK   2048
#define HA_STATE_RNEXT_SAME     4096    /* rnext_same occupied lastkey2 */

/* myisampack expects no more than 32 field types. */
enum en_fieldtype {
  FIELD_LAST=-1,FIELD_NORMAL,FIELD_SKIP_ENDSPACE,FIELD_SKIP_PRESPACE,
  FIELD_SKIP_ZERO,FIELD_BLOB,FIELD_CONSTANT,FIELD_INTERVALL,FIELD_ZERO,
  FIELD_VARCHAR,FIELD_CHECK,
  FIELD_enum_val_count
};

enum data_file_type {
  STATIC_RECORD,DYNAMIC_RECORD,COMPRESSED_RECORD
};

/* For key ranges */

#define NO_MIN_RANGE    1
#define NO_MAX_RANGE    2
#define NEAR_MIN        4
#define NEAR_MAX        8
#define UNIQUE_RANGE    16
#define EQ_RANGE        32
#define NULL_RANGE      64
#define GEOM_FLAG      128
#define SKIP_RANGE     256

typedef struct st_key_range
{
  const byte *key;
  uint length;
  enum ha_rkey_function flag;
} key_range;

typedef struct st_key_multi_range
{
  key_range start_key;
  key_range end_key;
  char  *ptr;                 /* Free to use by caller (ptr to row etc) */
  uint  range_flag;           /* key range flags see above */
} KEY_MULTI_RANGE;


/* For number of records */
#ifdef BIG_TABLES
#define rows2double(A)  ulonglong2double(A)
typedef my_off_t        ha_rows;
#else
#define rows2double(A)  (double) (A)
typedef ulong           ha_rows;
#endif

#define HA_POS_ERROR    (~ (ha_rows) 0)
#define HA_OFFSET_ERROR (~ (my_off_t) 0)

#if SYSTEM_SIZEOF_OFF_T == 4
#define MAX_FILE_SIZE   INT_MAX32
#else
#define MAX_FILE_SIZE   LONGLONG_MAX
#endif

#define HA_VARCHAR_PACKLENGTH(field_length) ((field_length) < 256 ? 1 :2)

#endif /* _my_base_h */

---

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