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mariadb/sql/handler.h
unknown 03bc599706 Merge of query cache from 4.1 to 5.0 
mysql-test/r/ndb_cache.result:
  Added 'order by' to select's
mysql-test/r/ndb_cache2.result:
  Added 'order by' to select's
mysql-test/t/ndb_cache.test:
  Added 'order by' to select's
mysql-test/t/ndb_cache2.test:
  Added 'order by' to select's
sql/ha_innodb.h:
  Changed function name
sql/ha_ndbcluster.cc:
  Merge from query cache from 4.1 to 5.0
  Added better comments
  ndb_get_table_statistics had changed, so there where some adaptions to make
sql/ha_ndbcluster.h:
  Changed name of function
sql/handler.h:
  Changed name of function
sql/sql_cache.cc:
  Changed name of function
2005-02-04 10:56:53 +01:00

677 lines
26 KiB
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/* Copyright (C) 2000,2004 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) || \
defined(HAVE_NDBCLUSTER_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
#define HA_ADMIN_REJECT -6
#define HA_ADMIN_TRY_ALTER -7
#define HA_ADMIN_WRONG_CHECKSUM -8
/* Bits in table_flags() to show what database can do */
#define HA_READ_RND_SAME (1 << 0) /* can switch index during the scan
with ::rnd_same() - not used yet.
see mi_rsame/heap_rsame/myrg_rsame */
#define HA_TABLE_SCAN_ON_INDEX (1 << 2) /* No separate data/index file */
#define HA_REC_NOT_IN_SEQ (1 << 3) /* ha_info don't return recnumber;
It returns a position to ha_r_rnd */
#define HA_CAN_GEOMETRY (1 << 4)
#define HA_FAST_KEY_READ (1 << 5) /* no need for a record cache in filesort */
#define HA_NULL_IN_KEY (1 << 7) /* One can have keys with NULL */
#define HA_DUPP_POS (1 << 8) /* ha_position() gives dup row */
#define HA_NO_BLOBS (1 << 9) /* Doesn't support blobs */
#define HA_CAN_INDEX_BLOBS (1 << 10)
#define HA_AUTO_PART_KEY (1 << 11) /* auto-increment in multi-part key */
#define HA_REQUIRE_PRIMARY_KEY (1 << 12) /* .. and can't create a hidden one */
#define HA_NOT_EXACT_COUNT (1 << 13)
#define HA_CAN_INSERT_DELAYED (1 << 14) /* only handlers with table-level locks
need no special code to support
INSERT DELAYED */
#define HA_PRIMARY_KEY_IN_READ_INDEX (1 << 15)
#define HA_NOT_DELETE_WITH_CACHE (1 << 18)
#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)
/* Table data are stored in separate files (for lower_case_table_names) */
#define HA_FILE_BASED (1 << 26)
#define HA_NO_VARCHAR (1 << 27)
#define HA_CAN_BIT_FIELD (1 << 28) /* supports bit fields */
#define HA_NEED_READ_RANGE_BUFFER (1 << 29) /* for read_multi_range */
/* bits in index_flags(index_number) for what you can do with index */
#define HA_READ_NEXT 1 /* TODO really use this flag */
#define HA_READ_PREV 2 /* supports ::index_prev */
#define HA_READ_ORDER 4 /* index_next/prev follow sort order */
#define HA_READ_RANGE 8 /* can find all records in a range */
#define HA_ONLY_WHOLE_INDEX 16 /* Can't use part key searches */
#define HA_KEYREAD_ONLY 64 /* Support HA_EXTRA_KEYREAD */
/* operations for disable/enable indexes */
#define HA_KEY_SWITCH_NONUNIQ 0
#define HA_KEY_SWITCH_ALL 1
#define HA_KEY_SWITCH_NONUNIQ_SAVE 2
#define HA_KEY_SWITCH_ALL_SAVE 3
/*
Bits in index_ddl_flags(KEY *wanted_index)
for what ddl you can do with index
If none is set, the wanted type of index is not supported
by the handler at all. See WorkLog 1563.
*/
#define HA_DDL_SUPPORT 1 /* Supported by handler */
#define HA_DDL_WITH_LOCK 2 /* Can create/drop with locked table */
#define HA_DDL_ONLINE 4 /* Can create/drop without lock */
/*
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_NOCACHE 1
#define HA_CACHE_TBL_ASKTRANSACT 2
#define HA_CACHE_TBL_TRANSACT 4
/* Options of START TRANSACTION statement (and later of SET TRANSACTION stmt) */
#define MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT 1
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_NDBCLUSTER,
DB_TYPE_EXAMPLE_DB, DB_TYPE_ARCHIVE_DB, DB_TYPE_CSV_DB,
DB_TYPE_FEDERATED_DB,
DB_TYPE_DEFAULT // Must be last
};
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,
ROW_TYPE_REDUNDANT, ROW_TYPE_COMPACT };
/* struct to hold information about the table that should be created */
/* Bits in used_fields */
#define HA_CREATE_USED_AUTO (1L << 0)
#define HA_CREATE_USED_RAID (1L << 1)
#define HA_CREATE_USED_UNION (1L << 2)
#define HA_CREATE_USED_INSERT_METHOD (1L << 3)
#define HA_CREATE_USED_MIN_ROWS (1L << 4)
#define HA_CREATE_USED_MAX_ROWS (1L << 5)
#define HA_CREATE_USED_AVG_ROW_LENGTH (1L << 6)
#define HA_CREATE_USED_PACK_KEYS (1L << 7)
#define HA_CREATE_USED_CHARSET (1L << 8)
#define HA_CREATE_USED_DEFAULT_CHARSET (1L << 9)
#define HA_CREATE_USED_DATADIR (1L << 10)
#define HA_CREATE_USED_INDEXDIR (1L << 11)
#define HA_CREATE_USED_ENGINE (1L << 12)
#define HA_CREATE_USED_CHECKSUM (1L << 13)
#define HA_CREATE_USED_DELAY_KEY_WRITE (1L << 14)
#define HA_CREATE_USED_ROW_FORMAT (1L << 15)
#define HA_CREATE_USED_COMMENT (1L << 16)
#define HA_CREATE_USED_PASSWORD (1L << 17)
typedef struct st_thd_trans {
void *bdb_tid;
void *innobase_tid;
bool innodb_active_trans;
void *ndb_tid;
} THD_TRANS;
#ifndef XIDDATASIZE /* no xa.h included */
/* XXX - may be we should disable xa completely in this case ? */
#define XIDDATASIZE 128
#define MAXGTRIDSIZE 64
#define MAXBQUALSIZE 64
struct xid_t {
long formatID;
long gtrid_length;
long bqual_length;
char data[XIDDATASIZE];
};
typedef struct xid_t XID;
#endif
typedef struct
{
byte slot;
uint savepoint_offset;
int (*close_connection)(THD *thd);
int (*savepoint_set)(THD *thd, void *sv);
int (*savepoint_rollback)(THD *thd, void *sv);
int (*savepoint_release)(THD *thd, void *sv);
int (*commit)(THD *thd, bool all);
int (*rollback)(THD *thd, bool all);
int (*prepare)(THD *thd, bool all);
int (*recover)(XID *xid_list, uint len);
int (*commit_by_xid)(XID *xid);
int (*rollback_by_xid)(XID *xid);
} handlerton;
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;
const char *comment,*password;
const char *data_file_name, *index_file_name;
const char *alias;
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 */
bool frm_only; /* 1 if no ha_create_table() */
bool varchar; /* 1 if table has a VARCHAR */
} HA_CREATE_INFO;
/* The handler for a table type. Will be included in the TABLE structure */
struct st_table;
typedef struct st_table TABLE;
struct st_foreign_key_info;
typedef struct st_foreign_key_info FOREIGN_KEY_INFO;
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;
/*
This is a buffer area that the handler can use to store rows.
'end_of_used_area' should be kept updated after calls to
read-functions so that other parts of the code can use the
remaining area (until next read calls is issued).
*/
typedef struct st_handler_buffer
{
const byte *buffer; /* Buffer one can start using */
const byte *buffer_end; /* End of buffer */
byte *end_of_used_area; /* End of area that was used by handler */
} HANDLER_BUFFER;
class handler :public Sql_alloc
{
protected:
struct st_table *table; /* The table definition */
virtual int index_init(uint idx) { active_index=idx; return 0; }
virtual int index_end() { active_index=MAX_KEY; return 0; }
/*
rnd_init() can be called two times without rnd_end() in between
(it only makes sense if scan=1).
then the second call should prepare for the new table scan (e.g
if rnd_init allocates the cursor, second call should position it
to the start of the table, no need to deallocate and allocate it again
*/
virtual int rnd_init(bool scan) =0;
virtual int rnd_end() { return 0; }
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;
/* The following are for read_multi_range */
bool multi_range_sorted;
KEY_MULTI_RANGE *multi_range_curr;
KEY_MULTI_RANGE *multi_range_end;
HANDLER_BUFFER *multi_range_buffer;
/* The following are for read_range() */
key_range save_end_range, *end_range;
KEY_PART_INFO *range_key_part;
int key_compare_result_on_equal;
bool eq_range;
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;
enum {NONE=0, INDEX, RND} inited;
bool auto_increment_column_changed;
bool implicit_emptied; /* Can be !=0 only if HEAP */
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_KEY),
ref_length(sizeof(my_off_t)), block_size(0),
raid_type(0), ft_handler(0), inited(NONE), implicit_emptied(0)
{}
virtual ~handler(void) { /* TODO: DBUG_ASSERT(inited == NONE); */ }
int ha_open(const char *name, int mode, int test_if_locked);
void update_auto_increment();
virtual void print_error(int error, myf errflag);
virtual bool get_error_message(int error, String *buf);
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 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; }
/*
Return upper bound of current number of records in the table
(max. of how many records one will retrieve when doing a full table scan)
If upper bound is not known, HA_POS_ERROR should be returned as a max
possible upper bound.
*/
virtual ha_rows estimate_rows_upper_bound()
{ return records+EXTRA_RECORDS; }
virtual const char *index_type(uint key_number) { DBUG_ASSERT(0); return "";}
int ha_index_init(uint idx)
{
DBUG_ENTER("ha_index_init");
DBUG_ASSERT(inited==NONE);
inited=INDEX;
DBUG_RETURN(index_init(idx));
}
int ha_index_end()
{
DBUG_ENTER("ha_index_end");
DBUG_ASSERT(inited==INDEX);
inited=NONE;
DBUG_RETURN(index_end());
}
int ha_rnd_init(bool scan)
{
DBUG_ENTER("ha_rnd_init");
DBUG_ASSERT(inited==NONE || (inited==RND && scan));
inited=RND;
DBUG_RETURN(rnd_init(scan));
}
int ha_rnd_end()
{
DBUG_ENTER("ha_rnd_end");
DBUG_ASSERT(inited==RND);
inited=NONE;
DBUG_RETURN(rnd_end());
}
/* this is necessary in many places, e.g. in HANDLER command */
int ha_index_or_rnd_end()
{
return inited == INDEX ? ha_index_end() : inited == RND ? ha_rnd_end() : 0;
}
uint get_index(void) const { return active_index; }
virtual int open(const char *name, int mode, uint test_if_locked)=0;
virtual int close(void)=0;
virtual int write_row(byte * buf) { return HA_ERR_WRONG_COMMAND; }
virtual int update_row(const byte * old_data, byte * new_data)
{ return HA_ERR_WRONG_COMMAND; }
virtual int delete_row(const byte * buf)
{ return HA_ERR_WRONG_COMMAND; }
virtual int index_read(byte * buf, const byte * key,
uint key_len, enum ha_rkey_function find_flag)
{ return HA_ERR_WRONG_COMMAND; }
virtual int index_read_idx(byte * buf, uint index, const byte * key,
uint key_len, enum ha_rkey_function find_flag);
virtual int index_next(byte * buf)
{ return HA_ERR_WRONG_COMMAND; }
virtual int index_prev(byte * buf)
{ return HA_ERR_WRONG_COMMAND; }
virtual int index_first(byte * buf)
{ return HA_ERR_WRONG_COMMAND; }
virtual int index_last(byte * buf)
{ return HA_ERR_WRONG_COMMAND; }
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 read_multi_range_first(KEY_MULTI_RANGE **found_range_p,
KEY_MULTI_RANGE *ranges, uint range_count,
bool sorted, HANDLER_BUFFER *buffer);
virtual int read_multi_range_next(KEY_MULTI_RANGE **found_range_p);
virtual int read_range_first(const key_range *start_key,
const key_range *end_key,
bool eq_range, bool sorted);
virtual int read_range_next();
int compare_key(key_range *range);
virtual int ft_init() { return HA_ERR_WRONG_COMMAND; }
void ft_end() { ft_handler=NULL; }
virtual FT_INFO *ft_init_ext(uint flags,uint inx,const byte *key,
uint keylen)
{ return NULL; }
virtual int ft_read(byte *buf) { return HA_ERR_WRONG_COMMAND; }
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);
/*
The following function is only needed for tables that may be temporary
tables during joins
*/
virtual int restart_rnd_next(byte *buf, byte *pos)
{ return HA_ERR_WRONG_COMMAND; }
virtual int rnd_same(byte *buf, uint inx)
{ return HA_ERR_WRONG_COMMAND; }
virtual ha_rows records_in_range(uint inx, key_range *min_key,
key_range *max_key)
{ return (ha_rows) 10; }
virtual void position(const byte *record)=0;
virtual void info(uint)=0;
virtual int extra(enum ha_extra_function operation)
{ return 0; }
virtual int extra_opt(enum ha_extra_function operation, ulong cache_size)
{ return extra(operation); }
virtual int reset() { return extra(HA_EXTRA_RESET); }
virtual int external_lock(THD *thd, int lock_type) { return 0; }
virtual void unlock_row() {}
virtual int start_stmt(THD *thd) {return 0;}
/*
This is called to delete all rows in a table
If the handler don't support this, then this function will
return HA_ERR_WRONG_COMMAND and MySQL will delete the rows one
by one.
*/
virtual int delete_all_rows()
{ return (my_errno=HA_ERR_WRONG_COMMAND); }
virtual ulonglong get_auto_increment();
virtual void restore_auto_increment();
virtual void update_create_info(HA_CREATE_INFO *create_info) {}
/* admin commands - called from mysql_admin_table */
virtual int check(THD* thd, HA_CHECK_OPT* check_opt)
{ return HA_ADMIN_NOT_IMPLEMENTED; }
virtual int backup(THD* thd, HA_CHECK_OPT* check_opt)
{ return HA_ADMIN_NOT_IMPLEMENTED; }
/*
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)
{ return HA_ADMIN_NOT_IMPLEMENTED; }
virtual int repair(THD* thd, HA_CHECK_OPT* check_opt)
{ return HA_ADMIN_NOT_IMPLEMENTED; }
virtual int optimize(THD* thd, HA_CHECK_OPT* check_opt)
{ return HA_ADMIN_NOT_IMPLEMENTED; }
virtual int analyze(THD* thd, HA_CHECK_OPT* check_opt)
{ return HA_ADMIN_NOT_IMPLEMENTED; }
virtual int assign_to_keycache(THD* thd, HA_CHECK_OPT* check_opt)
{ return HA_ADMIN_NOT_IMPLEMENTED; }
virtual int preload_keys(THD* thd, HA_CHECK_OPT* check_opt)
{ return HA_ADMIN_NOT_IMPLEMENTED; }
/* end of the list of admin commands */
virtual bool check_and_repair(THD *thd) { return HA_ERR_WRONG_COMMAND; }
virtual int dump(THD* thd, int fd = -1) { return HA_ERR_WRONG_COMMAND; }
virtual int disable_indexes(uint mode) { return HA_ERR_WRONG_COMMAND; }
virtual int enable_indexes(uint mode) { return HA_ERR_WRONG_COMMAND; }
virtual int indexes_are_disabled(void) {return 0;}
virtual void start_bulk_insert(ha_rows rows) {}
virtual int end_bulk_insert() {return 0; }
virtual int discard_or_import_tablespace(my_bool discard)
{return HA_ERR_WRONG_COMMAND;}
virtual int net_read_dump(NET* net) { return HA_ERR_WRONG_COMMAND; }
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 */
/* used in REPLACE; is > 0 if table is referred by a FOREIGN KEY */
virtual int get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list)
{ return 0; }
virtual uint referenced_by_foreign_key() { return 0;}
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, uint part, bool all_parts) const =0;
virtual ulong index_ddl_flags(KEY *wanted_index) const
{ return (HA_DDL_SUPPORT); }
virtual int add_index(TABLE *table_arg, KEY *key_info, uint num_of_keys)
{ return (HA_ERR_WRONG_COMMAND); }
virtual int drop_index(TABLE *table_arg, uint *key_num, uint num_of_keys)
{ return (HA_ERR_WRONG_COMMAND); }
uint max_record_length() const
{ return min(HA_MAX_REC_LENGTH, max_supported_record_length()); }
uint max_keys() const
{ return min(MAX_KEY, max_supported_keys()); }
uint max_key_parts() const
{ return min(MAX_REF_PARTS, max_supported_key_parts()); }
uint max_key_length() const
{ return min(MAX_KEY_LENGTH, max_supported_key_length()); }
uint max_key_part_length() const
{ return min(MAX_KEY_LENGTH, max_supported_key_part_length()); }
virtual uint max_supported_record_length() const { return HA_MAX_REC_LENGTH; }
virtual uint max_supported_keys() const { return 0; }
virtual uint max_supported_key_parts() const { return MAX_REF_PARTS; }
virtual uint max_supported_key_length() const { return MAX_KEY_LENGTH; }
virtual uint max_supported_key_part_length() const { 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; }
/*
default rename_table() and delete_table() rename/delete files with a
given name and extensions from bas_ext()
*/
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;
/* lock_count() can be more than one if the table is a MERGE */
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; }
/* ask handler about permission to cache table when query is to be cached */
virtual my_bool register_query_cache_table(THD *thd, char *table_key,
uint key_length,
qc_engine_callback
*engine_callback,
ulonglong *engine_data)
{
*engine_callback= 0;
return 1;
}
/*
RETURN
true Primary key (if there is one) is clustered key covering all fields
false otherwise
*/
virtual bool primary_key_is_clustered() { return FALSE; }
virtual int cmp_ref(const byte *ref1, const byte *ref2)
{
return memcmp(ref1, ref2, ref_length);
}
};
/* 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 && \
T != DB_TYPE_BERKELEY_DB && \
T != DB_TYPE_NDBCLUSTER)
enum db_type ha_resolve_by_name(const char *name, uint namelen);
const char *ha_get_storage_engine(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_create_table_from_engine(THD* thd, const char *db, const char *name,
bool create_if_found);
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_update_statistics();
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_release_savepoint_name(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_enable_transaction(THD *thd, bool on);
int ha_change_key_cache(KEY_CACHE *old_key_cache,
KEY_CACHE *new_key_cache);
int ha_discover(THD* thd, const char* dbname, const char* name,
const void** frmblob, uint* frmlen);
int ha_find_files(THD *thd,const char *db,const char *path,
const char *wild, bool dir,List<char>* files);
int ha_table_exists(THD* thd, const char* db, const char* name);
TYPELIB *ha_known_exts(void);
int ha_start_consistent_snapshot(THD *thd);
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