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mariadb/sql/handler.cc
unknown a4b0ad6cf2 Merge bk-internal.mysql.com:/home/bk/mysql-5.1-runtime 
into  bodhi.(none):/opt/local/work/mysql-5.1-12713-new


sql/handler.cc:
  Auto merged
sql/log.cc:
  Auto merged
2007-08-31 10:58:02 +04:00

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/* Copyright (C) 2000-2006 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; version 2 of the License.
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 */
/** @file handler.cc
@brief
Handler-calling-functions
*/
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
#include "mysql_priv.h"
#include "rpl_filter.h"
#include <myisampack.h>
#include <errno.h>
#ifdef WITH_PARTITION_STORAGE_ENGINE
#include "ha_partition.h"
#endif
/*
While we have legacy_db_type, we have this array to
check for dups and to find handlerton from legacy_db_type.
Remove when legacy_db_type is finally gone
*/
st_plugin_int *hton2plugin[MAX_HA];
static handlerton *installed_htons[128];
#define BITMAP_STACKBUF_SIZE (128/8)
KEY_CREATE_INFO default_key_create_info= { HA_KEY_ALG_UNDEF, 0, {NullS,0} };
/* number of entries in handlertons[] */
ulong total_ha= 0;
/* number of storage engines (from handlertons[]) that support 2pc */
ulong total_ha_2pc= 0;
/* size of savepoint storage area (see ha_init) */
ulong savepoint_alloc_size= 0;
static const LEX_STRING sys_table_aliases[]=
{
{ C_STRING_WITH_LEN("INNOBASE") }, { C_STRING_WITH_LEN("INNODB") },
{ C_STRING_WITH_LEN("NDB") }, { C_STRING_WITH_LEN("NDBCLUSTER") },
{ C_STRING_WITH_LEN("HEAP") }, { C_STRING_WITH_LEN("MEMORY") },
{ C_STRING_WITH_LEN("MERGE") }, { C_STRING_WITH_LEN("MRG_MYISAM") },
{NullS, 0}
};
const char *ha_row_type[] = {
"", "FIXED", "DYNAMIC", "COMPRESSED", "REDUNDANT", "COMPACT", "PAGE", "?","?","?"
};
const char *tx_isolation_names[] =
{ "READ-UNCOMMITTED", "READ-COMMITTED", "REPEATABLE-READ", "SERIALIZABLE",
NullS};
TYPELIB tx_isolation_typelib= {array_elements(tx_isolation_names)-1,"",
tx_isolation_names, NULL};
static TYPELIB known_extensions= {0,"known_exts", NULL, NULL};
uint known_extensions_id= 0;
static plugin_ref ha_default_plugin(THD *thd)
{
if (thd->variables.table_plugin)
return thd->variables.table_plugin;
return my_plugin_lock(thd, &global_system_variables.table_plugin);
}
/** @brief
Return the default storage engine handlerton for thread
SYNOPSIS
ha_default_handlerton(thd)
thd current thread
RETURN
pointer to handlerton
*/
handlerton *ha_default_handlerton(THD *thd)
{
plugin_ref plugin= ha_default_plugin(thd);
DBUG_ASSERT(plugin);
handlerton *hton= plugin_data(plugin, handlerton*);
DBUG_ASSERT(hton);
return hton;
}
/** @brief
Return the storage engine handlerton for the supplied name
SYNOPSIS
ha_resolve_by_name(thd, name)
thd current thread
name name of storage engine
RETURN
pointer to storage engine plugin handle
*/
plugin_ref ha_resolve_by_name(THD *thd, const LEX_STRING *name)
{
const LEX_STRING *table_alias;
plugin_ref plugin;
redo:
/* my_strnncoll is a macro and gcc doesn't do early expansion of macro */
if (thd && !my_charset_latin1.coll->strnncoll(&my_charset_latin1,
(const uchar *)name->str, name->length,
(const uchar *)STRING_WITH_LEN("DEFAULT"), 0))
return ha_default_plugin(thd);
if ((plugin= my_plugin_lock_by_name(thd, name, MYSQL_STORAGE_ENGINE_PLUGIN)))
{
handlerton *hton= plugin_data(plugin, handlerton *);
if (!(hton->flags & HTON_NOT_USER_SELECTABLE))
return plugin;
/*
unlocking plugin immediately after locking is relatively low cost.
*/
plugin_unlock(thd, plugin);
}
/*
We check for the historical aliases.
*/
for (table_alias= sys_table_aliases; table_alias->str; table_alias+= 2)
{
if (!my_strnncoll(&my_charset_latin1,
(const uchar *)name->str, name->length,
(const uchar *)table_alias->str, table_alias->length))
{
name= table_alias + 1;
goto redo;
}
}
return NULL;
}
plugin_ref ha_lock_engine(THD *thd, handlerton *hton)
{
if (hton)
{
st_plugin_int **plugin= hton2plugin + hton->slot;
#ifdef DBUG_OFF
return my_plugin_lock(thd, plugin);
#else
return my_plugin_lock(thd, &plugin);
#endif
}
return NULL;
}
#ifdef NOT_USED
static handler *create_default(TABLE_SHARE *table, MEM_ROOT *mem_root)
{
handlerton *hton= ha_default_handlerton(current_thd);
return (hton && hton->create) ? hton->create(hton, table, mem_root) : NULL;
}
#endif
handlerton *ha_resolve_by_legacy_type(THD *thd, enum legacy_db_type db_type)
{
plugin_ref plugin;
switch (db_type) {
case DB_TYPE_DEFAULT:
return ha_default_handlerton(thd);
default:
if (db_type > DB_TYPE_UNKNOWN && db_type < DB_TYPE_DEFAULT &&
(plugin= ha_lock_engine(thd, installed_htons[db_type])))
return plugin_data(plugin, handlerton*);
/* fall through */
case DB_TYPE_UNKNOWN:
return NULL;
}
}
/** @brief
Use other database handler if databasehandler is not compiled in
*/
handlerton *ha_checktype(THD *thd, enum legacy_db_type database_type,
bool no_substitute, bool report_error)
{
handlerton *hton= ha_resolve_by_legacy_type(thd, database_type);
if (ha_storage_engine_is_enabled(hton))
return hton;
if (no_substitute)
{
if (report_error)
{
const char *engine_name= ha_resolve_storage_engine_name(hton);
my_error(ER_FEATURE_DISABLED,MYF(0),engine_name,engine_name);
}
return NULL;
}
switch (database_type) {
#ifndef NO_HASH
case DB_TYPE_HASH:
return ha_resolve_by_legacy_type(thd, DB_TYPE_HASH);
#endif
case DB_TYPE_MRG_ISAM:
return ha_resolve_by_legacy_type(thd, DB_TYPE_MRG_MYISAM);
default:
break;
}
return ha_default_handlerton(thd);
} /* ha_checktype */
handler *get_new_handler(TABLE_SHARE *share, MEM_ROOT *alloc,
handlerton *db_type)
{
handler *file;
DBUG_ENTER("get_new_handler");
DBUG_PRINT("enter", ("alloc: 0x%lx", (long) alloc));
if (db_type && db_type->state == SHOW_OPTION_YES && db_type->create)
{
if ((file= db_type->create(db_type, share, alloc)))
file->init();
DBUG_RETURN(file);
}
/*
Try the default table type
Here the call to current_thd() is ok as we call this function a lot of
times but we enter this branch very seldom.
*/
DBUG_RETURN(get_new_handler(share, alloc, ha_default_handlerton(current_thd)));
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
handler *get_ha_partition(partition_info *part_info)
{
ha_partition *partition;
DBUG_ENTER("get_ha_partition");
if ((partition= new ha_partition(partition_hton, part_info)))
{
if (partition->initialise_partition(current_thd->mem_root))
{
delete partition;
partition= 0;
}
else
partition->init();
}
else
{
my_error(ER_OUTOFMEMORY, MYF(0), sizeof(ha_partition));
}
DBUG_RETURN(((handler*) partition));
}
#endif
/** @brief
Register handler error messages for use with my_error().
SYNOPSIS
ha_init_errors()
RETURN
0 OK
!= 0 Error
*/
static int ha_init_errors(void)
{
#define SETMSG(nr, msg) errmsgs[(nr) - HA_ERR_FIRST]= (msg)
const char **errmsgs;
/* Allocate a pointer array for the error message strings. */
/* Zerofill it to avoid uninitialized gaps. */
if (! (errmsgs= (const char**) my_malloc(HA_ERR_ERRORS * sizeof(char*),
MYF(MY_WME | MY_ZEROFILL))))
return 1;
/* Set the dedicated error messages. */
SETMSG(HA_ERR_KEY_NOT_FOUND, ER(ER_KEY_NOT_FOUND));
SETMSG(HA_ERR_FOUND_DUPP_KEY, ER(ER_DUP_KEY));
SETMSG(HA_ERR_RECORD_CHANGED, "Update wich is recoverable");
SETMSG(HA_ERR_WRONG_INDEX, "Wrong index given to function");
SETMSG(HA_ERR_CRASHED, ER(ER_NOT_KEYFILE));
SETMSG(HA_ERR_WRONG_IN_RECORD, ER(ER_CRASHED_ON_USAGE));
SETMSG(HA_ERR_OUT_OF_MEM, "Table handler out of memory");
SETMSG(HA_ERR_NOT_A_TABLE, "Incorrect file format '%.64s'");
SETMSG(HA_ERR_WRONG_COMMAND, "Command not supported");
SETMSG(HA_ERR_OLD_FILE, ER(ER_OLD_KEYFILE));
SETMSG(HA_ERR_NO_ACTIVE_RECORD, "No record read in update");
SETMSG(HA_ERR_RECORD_DELETED, "Intern record deleted");
SETMSG(HA_ERR_RECORD_FILE_FULL, ER(ER_RECORD_FILE_FULL));
SETMSG(HA_ERR_INDEX_FILE_FULL, "No more room in index file '%.64s'");
SETMSG(HA_ERR_END_OF_FILE, "End in next/prev/first/last");
SETMSG(HA_ERR_UNSUPPORTED, ER(ER_ILLEGAL_HA));
SETMSG(HA_ERR_TO_BIG_ROW, "Too big row");
SETMSG(HA_WRONG_CREATE_OPTION, "Wrong create option");
SETMSG(HA_ERR_FOUND_DUPP_UNIQUE, ER(ER_DUP_UNIQUE));
SETMSG(HA_ERR_UNKNOWN_CHARSET, "Can't open charset");
SETMSG(HA_ERR_WRONG_MRG_TABLE_DEF, ER(ER_WRONG_MRG_TABLE));
SETMSG(HA_ERR_CRASHED_ON_REPAIR, ER(ER_CRASHED_ON_REPAIR));
SETMSG(HA_ERR_CRASHED_ON_USAGE, ER(ER_CRASHED_ON_USAGE));
SETMSG(HA_ERR_LOCK_WAIT_TIMEOUT, ER(ER_LOCK_WAIT_TIMEOUT));
SETMSG(HA_ERR_LOCK_TABLE_FULL, ER(ER_LOCK_TABLE_FULL));
SETMSG(HA_ERR_READ_ONLY_TRANSACTION, ER(ER_READ_ONLY_TRANSACTION));
SETMSG(HA_ERR_LOCK_DEADLOCK, ER(ER_LOCK_DEADLOCK));
SETMSG(HA_ERR_CANNOT_ADD_FOREIGN, ER(ER_CANNOT_ADD_FOREIGN));
SETMSG(HA_ERR_NO_REFERENCED_ROW, ER(ER_NO_REFERENCED_ROW_2));
SETMSG(HA_ERR_ROW_IS_REFERENCED, ER(ER_ROW_IS_REFERENCED_2));
SETMSG(HA_ERR_NO_SAVEPOINT, "No savepoint with that name");
SETMSG(HA_ERR_NON_UNIQUE_BLOCK_SIZE, "Non unique key block size");
SETMSG(HA_ERR_NO_SUCH_TABLE, "No such table: '%.64s'");
SETMSG(HA_ERR_TABLE_EXIST, ER(ER_TABLE_EXISTS_ERROR));
SETMSG(HA_ERR_NO_CONNECTION, "Could not connect to storage engine");
SETMSG(HA_ERR_TABLE_DEF_CHANGED, ER(ER_TABLE_DEF_CHANGED));
SETMSG(HA_ERR_FOREIGN_DUPLICATE_KEY, "FK constraint would lead to duplicate key");
SETMSG(HA_ERR_TABLE_NEEDS_UPGRADE, ER(ER_TABLE_NEEDS_UPGRADE));
SETMSG(HA_ERR_TABLE_READONLY, ER(ER_OPEN_AS_READONLY));
SETMSG(HA_ERR_AUTOINC_READ_FAILED, ER(ER_AUTOINC_READ_FAILED));
SETMSG(HA_ERR_AUTOINC_ERANGE, ER(ER_WARN_DATA_OUT_OF_RANGE));
/* Register the error messages for use with my_error(). */
return my_error_register(errmsgs, HA_ERR_FIRST, HA_ERR_LAST);
}
/** @brief
Unregister handler error messages.
SYNOPSIS
ha_finish_errors()
RETURN
0 OK
!= 0 Error
*/
static int ha_finish_errors(void)
{
const char **errmsgs;
/* Allocate a pointer array for the error message strings. */
if (! (errmsgs= my_error_unregister(HA_ERR_FIRST, HA_ERR_LAST)))
return 1;
my_free((uchar*) errmsgs, MYF(0));
return 0;
}
int ha_finalize_handlerton(st_plugin_int *plugin)
{
handlerton *hton= (handlerton *)plugin->data;
DBUG_ENTER("ha_finalize_handlerton");
switch (hton->state)
{
case SHOW_OPTION_NO:
case SHOW_OPTION_DISABLED:
break;
case SHOW_OPTION_YES:
if (installed_htons[hton->db_type] == hton)
installed_htons[hton->db_type]= NULL;
break;
};
if (hton->panic)
hton->panic(hton, HA_PANIC_CLOSE);
if (plugin->plugin->deinit)
{
/*
Today we have no defined/special behavior for uninstalling
engine plugins.
*/
DBUG_PRINT("info", ("Deinitializing plugin: '%s'", plugin->name.str));
if (plugin->plugin->deinit(NULL))
{
DBUG_PRINT("warning", ("Plugin '%s' deinit function returned error.",
plugin->name.str));
}
}
my_free((uchar*)hton, MYF(0));
DBUG_RETURN(0);
}
int ha_initialize_handlerton(st_plugin_int *plugin)
{
handlerton *hton;
DBUG_ENTER("ha_initialize_handlerton");
DBUG_PRINT("plugin", ("initialize plugin: '%s'", plugin->name.str));
hton= (handlerton *)my_malloc(sizeof(handlerton),
MYF(MY_WME | MY_ZEROFILL));
/* Historical Requirement */
plugin->data= hton; // shortcut for the future
if (plugin->plugin->init)
{
if (plugin->plugin->init(hton))
{
sql_print_error("Plugin '%s' init function returned error.",
plugin->name.str);
goto err;
}
}
/*
the switch below and hton->state should be removed when
command-line options for plugins will be implemented
*/
switch (hton->state) {
case SHOW_OPTION_NO:
break;
case SHOW_OPTION_YES:
{
uint tmp;
/* now check the db_type for conflict */
if (hton->db_type <= DB_TYPE_UNKNOWN ||
hton->db_type >= DB_TYPE_DEFAULT ||
installed_htons[hton->db_type])
{
int idx= (int) DB_TYPE_FIRST_DYNAMIC;
while (idx < (int) DB_TYPE_DEFAULT && installed_htons[idx])
idx++;
if (idx == (int) DB_TYPE_DEFAULT)
{
sql_print_warning("Too many storage engines!");
DBUG_RETURN(1);
}
if (hton->db_type != DB_TYPE_UNKNOWN)
sql_print_warning("Storage engine '%s' has conflicting typecode. "
"Assigning value %d.", plugin->plugin->name, idx);
hton->db_type= (enum legacy_db_type) idx;
}
installed_htons[hton->db_type]= hton;
tmp= hton->savepoint_offset;
hton->savepoint_offset= savepoint_alloc_size;
savepoint_alloc_size+= tmp;
hton->slot= total_ha++;
hton2plugin[hton->slot]=plugin;
if (hton->prepare)
total_ha_2pc++;
break;
}
/* fall through */
default:
hton->state= SHOW_OPTION_DISABLED;
break;
}
/*
This is entirely for legacy. We will create a new "disk based" hton and a
"memory" hton which will be configurable longterm. We should be able to
remove partition and myisammrg.
*/
switch (hton->db_type) {
case DB_TYPE_HEAP:
heap_hton= hton;
break;
case DB_TYPE_MYISAM:
myisam_hton= hton;
break;
case DB_TYPE_PARTITION_DB:
partition_hton= hton;
break;
default:
break;
};
DBUG_RETURN(0);
err:
DBUG_RETURN(1);
}
int ha_init()
{
int error= 0;
DBUG_ENTER("ha_init");
if (ha_init_errors())
DBUG_RETURN(1);
DBUG_ASSERT(total_ha < MAX_HA);
/*
Check if there is a transaction-capable storage engine besides the
binary log (which is considered a transaction-capable storage engine in
counting total_ha)
*/
opt_using_transactions= total_ha>(ulong)opt_bin_log;
savepoint_alloc_size+= sizeof(SAVEPOINT);
DBUG_RETURN(error);
}
int ha_end()
{
int error= 0;
DBUG_ENTER("ha_end");
/*
This should be eventualy based on the graceful shutdown flag.
So if flag is equal to HA_PANIC_CLOSE, the deallocate
the errors.
*/
if (ha_finish_errors())
error= 1;
DBUG_RETURN(error);
}
static my_bool dropdb_handlerton(THD *unused1, plugin_ref plugin,
void *path)
{
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES && hton->drop_database)
hton->drop_database(hton, (char *)path);
return FALSE;
}
void ha_drop_database(char* path)
{
plugin_foreach(NULL, dropdb_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN, path);
}
static my_bool closecon_handlerton(THD *thd, plugin_ref plugin,
void *unused)
{
handlerton *hton= plugin_data(plugin, handlerton *);
/*
there's no need to rollback here as all transactions must
be rolled back already
*/
if (hton->state == SHOW_OPTION_YES && hton->close_connection &&
thd_get_ha_data(thd, hton))
hton->close_connection(hton, thd);
return FALSE;
}
/** @brief
don't bother to rollback here, it's done already
*/
void ha_close_connection(THD* thd)
{
plugin_foreach(thd, closecon_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN, 0);
}
/* ========================================================================
======================= TRANSACTIONS ===================================*/
/** @brief
Register a storage engine for a transaction
DESCRIPTION
Every storage engine MUST call this function when it starts
a transaction or a statement (that is it must be called both for the
"beginning of transaction" and "beginning of statement").
Only storage engines registered for the transaction/statement
will know when to commit/rollback it.
NOTE
trans_register_ha is idempotent - storage engine may register many
times per transaction.
*/
void trans_register_ha(THD *thd, bool all, handlerton *ht_arg)
{
THD_TRANS *trans;
handlerton **ht;
DBUG_ENTER("trans_register_ha");
DBUG_PRINT("enter",("%s", all ? "all" : "stmt"));
if (all)
{
trans= &thd->transaction.all;
thd->server_status|= SERVER_STATUS_IN_TRANS;
}
else
trans= &thd->transaction.stmt;
for (ht=trans->ht; *ht; ht++)
if (*ht == ht_arg)
DBUG_VOID_RETURN; /* already registered, return */
trans->ht[trans->nht++]=ht_arg;
DBUG_ASSERT(*ht == ht_arg);
trans->no_2pc|=(ht_arg->prepare==0);
if (thd->transaction.xid_state.xid.is_null())
thd->transaction.xid_state.xid.set(thd->query_id);
DBUG_VOID_RETURN;
}
/** @brief
RETURN
0 - ok
1 - error, transaction was rolled back
*/
int ha_prepare(THD *thd)
{
int error=0, all=1;
THD_TRANS *trans=all ? &thd->transaction.all : &thd->transaction.stmt;
handlerton **ht=trans->ht;
DBUG_ENTER("ha_prepare");
#ifdef USING_TRANSACTIONS
if (trans->nht)
{
for (; *ht; ht++)
{
int err;
status_var_increment(thd->status_var.ha_prepare_count);
if ((*ht)->prepare)
{
if ((err= (*(*ht)->prepare)(*ht, thd, all)))
{
my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
ha_rollback_trans(thd, all);
error=1;
break;
}
}
else
{
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_ILLEGAL_HA, ER(ER_ILLEGAL_HA),
ha_resolve_storage_engine_name(*ht));
}
}
}
#endif /* USING_TRANSACTIONS */
DBUG_RETURN(error);
}
/** @brief
RETURN
0 - ok
1 - transaction was rolled back
2 - error during commit, data may be inconsistent
*/
int ha_commit_trans(THD *thd, bool all)
{
int error= 0, cookie= 0;
THD_TRANS *trans= all ? &thd->transaction.all : &thd->transaction.stmt;
bool is_real_trans= all || thd->transaction.all.nht == 0;
handlerton **ht= trans->ht;
my_xid xid= thd->transaction.xid_state.xid.get_my_xid();
DBUG_ENTER("ha_commit_trans");
if (thd->in_sub_stmt)
{
/*
Since we don't support nested statement transactions in 5.0,
we can't commit or rollback stmt transactions while we are inside
stored functions or triggers. So we simply do nothing now.
TODO: This should be fixed in later ( >= 5.1) releases.
*/
if (!all)
DBUG_RETURN(0);
/*
We assume that all statements which commit or rollback main transaction
are prohibited inside of stored functions or triggers. So they should
bail out with error even before ha_commit_trans() call. To be 100% safe
let us throw error in non-debug builds.
*/
DBUG_ASSERT(0);
my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
DBUG_RETURN(2);
}
#ifdef USING_TRANSACTIONS
if (trans->nht)
{
if (is_real_trans && wait_if_global_read_lock(thd, 0, 0))
{
ha_rollback_trans(thd, all);
DBUG_RETURN(1);
}
if ( is_real_trans
&& opt_readonly
&& ! (thd->security_ctx->master_access & SUPER_ACL)
&& ! thd->slave_thread
)
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
ha_rollback_trans(thd, all);
error= 1;
goto end;
}
DBUG_EXECUTE_IF("crash_commit_before", abort(););
/* Close all cursors that can not survive COMMIT */
if (is_real_trans) /* not a statement commit */
thd->stmt_map.close_transient_cursors();
if (!trans->no_2pc && trans->nht > 1)
{
for (; *ht && !error; ht++)
{
int err;
if ((err= (*(*ht)->prepare)(*ht, thd, all)))
{
my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
error= 1;
}
status_var_increment(thd->status_var.ha_prepare_count);
}
DBUG_EXECUTE_IF("crash_commit_after_prepare", abort(););
if (error || (is_real_trans && xid &&
(error= !(cookie= tc_log->log_xid(thd, xid)))))
{
ha_rollback_trans(thd, all);
error= 1;
goto end;
}
DBUG_EXECUTE_IF("crash_commit_after_log", abort(););
}
error=ha_commit_one_phase(thd, all) ? (cookie ? 2 : 1) : 0;
DBUG_EXECUTE_IF("crash_commit_before_unlog", abort(););
if (cookie)
tc_log->unlog(cookie, xid);
DBUG_EXECUTE_IF("crash_commit_after", abort(););
end:
if (is_real_trans)
start_waiting_global_read_lock(thd);
}
#endif /* USING_TRANSACTIONS */
DBUG_RETURN(error);
}
/** @brief
NOTE - this function does not care about global read lock.
A caller should.
*/
int ha_commit_one_phase(THD *thd, bool all)
{
int error=0;
THD_TRANS *trans=all ? &thd->transaction.all : &thd->transaction.stmt;
bool is_real_trans=all || thd->transaction.all.nht == 0;
handlerton **ht=trans->ht;
DBUG_ENTER("ha_commit_one_phase");
#ifdef USING_TRANSACTIONS
if (trans->nht)
{
for (ht=trans->ht; *ht; ht++)
{
int err;
if ((err= (*(*ht)->commit)(*ht, thd, all)))
{
my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
error=1;
}
status_var_increment(thd->status_var.ha_commit_count);
*ht= 0;
}
trans->nht=0;
trans->no_2pc=0;
if (is_real_trans)
thd->transaction.xid_state.xid.null();
if (all)
{
#ifdef HAVE_QUERY_CACHE
if (thd->transaction.changed_tables)
query_cache.invalidate(thd->transaction.changed_tables);
#endif
thd->variables.tx_isolation=thd->session_tx_isolation;
thd->transaction.cleanup();
}
}
#endif /* USING_TRANSACTIONS */
DBUG_RETURN(error);
}
int ha_rollback_trans(THD *thd, bool all)
{
int error=0;
THD_TRANS *trans=all ? &thd->transaction.all : &thd->transaction.stmt;
bool is_real_trans=all || thd->transaction.all.nht == 0;
DBUG_ENTER("ha_rollback_trans");
if (thd->in_sub_stmt)
{
/*
If we are inside stored function or trigger we should not commit or
rollback current statement transaction. See comment in ha_commit_trans()
call for more information.
*/
if (!all)
DBUG_RETURN(0);
DBUG_ASSERT(0);
my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
DBUG_RETURN(1);
}
#ifdef USING_TRANSACTIONS
if (trans->nht)
{
/* Close all cursors that can not survive ROLLBACK */
if (is_real_trans) /* not a statement commit */
thd->stmt_map.close_transient_cursors();
for (handlerton **ht=trans->ht; *ht; ht++)
{
int err;
if ((err= (*(*ht)->rollback)(*ht, thd, all)))
{ // cannot happen
my_error(ER_ERROR_DURING_ROLLBACK, MYF(0), err);
error=1;
}
status_var_increment(thd->status_var.ha_rollback_count);
*ht= 0;
}
trans->nht=0;
trans->no_2pc=0;
if (is_real_trans)
thd->transaction.xid_state.xid.null();
if (all)
{
thd->variables.tx_isolation=thd->session_tx_isolation;
thd->transaction.cleanup();
}
}
#endif /* USING_TRANSACTIONS */
if (all)
thd->transaction_rollback_request= FALSE;
/*
If a non-transactional table was updated, warn; don't warn if this is a
slave thread (because when a slave thread executes a ROLLBACK, it has
been read from the binary log, so it's 100% sure and normal to produce
error ER_WARNING_NOT_COMPLETE_ROLLBACK. If we sent the warning to the
slave SQL thread, it would not stop the thread but just be printed in
the error log; but we don't want users to wonder why they have this
message in the error log, so we don't send it.
*/
if (is_real_trans && thd->transaction.all.modified_non_trans_table &&
!thd->slave_thread && thd->killed != THD::KILL_CONNECTION)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_WARNING_NOT_COMPLETE_ROLLBACK,
ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
DBUG_RETURN(error);
}
/** @brief
This is used to commit or rollback a single statement depending on the value
of error. Note that if the autocommit is on, then the following call inside
InnoDB will commit or rollback the whole transaction (= the statement). The
autocommit mechanism built into InnoDB is based on counting locks, but if
the user has used LOCK TABLES then that mechanism does not know to do the
commit.
*/
int ha_autocommit_or_rollback(THD *thd, int error)
{
DBUG_ENTER("ha_autocommit_or_rollback");
#ifdef USING_TRANSACTIONS
if (thd->transaction.stmt.nht)
{
if (!error)
{
if (ha_commit_stmt(thd))
error=1;
}
else if (thd->transaction_rollback_request && !thd->in_sub_stmt)
(void) ha_rollback(thd);
else
(void) ha_rollback_stmt(thd);
thd->variables.tx_isolation=thd->session_tx_isolation;
}
#endif
DBUG_RETURN(error);
}
struct xahton_st {
XID *xid;
int result;
};
static my_bool xacommit_handlerton(THD *unused1, plugin_ref plugin,
void *arg)
{
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES && hton->recover)
{
hton->commit_by_xid(hton, ((struct xahton_st *)arg)->xid);
((struct xahton_st *)arg)->result= 0;
}
return FALSE;
}
static my_bool xarollback_handlerton(THD *unused1, plugin_ref plugin,
void *arg)
{
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES && hton->recover)
{
hton->rollback_by_xid(hton, ((struct xahton_st *)arg)->xid);
((struct xahton_st *)arg)->result= 0;
}
return FALSE;
}
int ha_commit_or_rollback_by_xid(XID *xid, bool commit)
{
struct xahton_st xaop;
xaop.xid= xid;
xaop.result= 1;
plugin_foreach(NULL, commit ? xacommit_handlerton : xarollback_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, &xaop);
return xaop.result;
}
#ifndef DBUG_OFF
/* this does not need to be multi-byte safe or anything */
static char* xid_to_str(char *buf, XID *xid)
{
int i;
char *s=buf;
*s++='\'';
for (i=0; i < xid->gtrid_length+xid->bqual_length; i++)
{
uchar c=(uchar)xid->data[i];
/* is_next_dig is set if next character is a number */
bool is_next_dig= FALSE;
if (i < XIDDATASIZE)
{
char ch= xid->data[i+1];
is_next_dig= (ch >= '0' && ch <='9');
}
if (i == xid->gtrid_length)
{
*s++='\'';
if (xid->bqual_length)
{
*s++='.';
*s++='\'';
}
}
if (c < 32 || c > 126)
{
*s++='\\';
/*
If next character is a number, write current character with
3 octal numbers to ensure that the next number is not seen
as part of the octal number
*/
if (c > 077 || is_next_dig)
*s++=_dig_vec_lower[c >> 6];
if (c > 007 || is_next_dig)
*s++=_dig_vec_lower[(c >> 3) & 7];
*s++=_dig_vec_lower[c & 7];
}
else
{
if (c == '\'' || c == '\\')
*s++='\\';
*s++=c;
}
}
*s++='\'';
*s=0;
return buf;
}
#endif
/** @brief
recover() step of xa
NOTE
there are three modes of operation:
- automatic recover after a crash
in this case commit_list != 0, tc_heuristic_recover==0
all xids from commit_list are committed, others are rolled back
- manual (heuristic) recover
in this case commit_list==0, tc_heuristic_recover != 0
DBA has explicitly specified that all prepared transactions should
be committed (or rolled back).
- no recovery (MySQL did not detect a crash)
in this case commit_list==0, tc_heuristic_recover == 0
there should be no prepared transactions in this case.
*/
struct xarecover_st
{
int len, found_foreign_xids, found_my_xids;
XID *list;
HASH *commit_list;
bool dry_run;
};
static my_bool xarecover_handlerton(THD *unused, plugin_ref plugin,
void *arg)
{
handlerton *hton= plugin_data(plugin, handlerton *);
struct xarecover_st *info= (struct xarecover_st *) arg;
int got;
if (hton->state == SHOW_OPTION_YES && hton->recover)
{
while ((got= hton->recover(hton, info->list, info->len)) > 0 )
{
sql_print_information("Found %d prepared transaction(s) in %s",
got, ha_resolve_storage_engine_name(hton));
for (int i=0; i < got; i ++)
{
my_xid x=info->list[i].get_my_xid();
if (!x) // not "mine" - that is generated by external TM
{
#ifndef DBUG_OFF
char buf[XIDDATASIZE*4+6]; // see xid_to_str
sql_print_information("ignore xid %s", xid_to_str(buf, info->list+i));
#endif
xid_cache_insert(info->list+i, XA_PREPARED);
info->found_foreign_xids++;
continue;
}
if (info->dry_run)
{
info->found_my_xids++;
continue;
}
// recovery mode
if (info->commit_list ?
hash_search(info->commit_list, (uchar *)&x, sizeof(x)) != 0 :
tc_heuristic_recover == TC_HEURISTIC_RECOVER_COMMIT)
{
#ifndef DBUG_OFF
char buf[XIDDATASIZE*4+6]; // see xid_to_str
sql_print_information("commit xid %s", xid_to_str(buf, info->list+i));
#endif
hton->commit_by_xid(hton, info->list+i);
}
else
{
#ifndef DBUG_OFF
char buf[XIDDATASIZE*4+6]; // see xid_to_str
sql_print_information("rollback xid %s",
xid_to_str(buf, info->list+i));
#endif
hton->rollback_by_xid(hton, info->list+i);
}
}
if (got < info->len)
break;
}
}
return FALSE;
}
int ha_recover(HASH *commit_list)
{
struct xarecover_st info;
DBUG_ENTER("ha_recover");
info.found_foreign_xids= info.found_my_xids= 0;
info.commit_list= commit_list;
info.dry_run= (info.commit_list==0 && tc_heuristic_recover==0);
info.list= NULL;
/* commit_list and tc_heuristic_recover cannot be set both */
DBUG_ASSERT(info.commit_list==0 || tc_heuristic_recover==0);
/* if either is set, total_ha_2pc must be set too */
DBUG_ASSERT(info.dry_run || total_ha_2pc>(ulong)opt_bin_log);
if (total_ha_2pc <= (ulong)opt_bin_log)
DBUG_RETURN(0);
if (info.commit_list)
sql_print_information("Starting crash recovery...");
#ifndef WILL_BE_DELETED_LATER
/*
for now, only InnoDB supports 2pc. It means we can always safely
rollback all pending transactions, without risking inconsistent data
*/
DBUG_ASSERT(total_ha_2pc == (ulong) opt_bin_log+1); // only InnoDB and binlog
tc_heuristic_recover= TC_HEURISTIC_RECOVER_ROLLBACK; // forcing ROLLBACK
info.dry_run=FALSE;
#endif
for (info.len= MAX_XID_LIST_SIZE ;
info.list==0 && info.len > MIN_XID_LIST_SIZE; info.len/=2)
{
info.list=(XID *)my_malloc(info.len*sizeof(XID), MYF(0));
}
if (!info.list)
{
sql_print_error(ER(ER_OUTOFMEMORY), info.len*sizeof(XID));
DBUG_RETURN(1);
}
plugin_foreach(NULL, xarecover_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, &info);
my_free((uchar*)info.list, MYF(0));
if (info.found_foreign_xids)
sql_print_warning("Found %d prepared XA transactions",
info.found_foreign_xids);
if (info.dry_run && info.found_my_xids)
{
sql_print_error("Found %d prepared transactions! It means that mysqld was "
"not shut down properly last time and critical recovery "
"information (last binlog or %s file) was manually deleted "
"after a crash. You have to start mysqld with "
"--tc-heuristic-recover switch to commit or rollback "
"pending transactions.",
info.found_my_xids, opt_tc_log_file);
DBUG_RETURN(1);
}
if (info.commit_list)
sql_print_information("Crash recovery finished.");
DBUG_RETURN(0);
}
/** @brief
return the list of XID's to a client, the same way SHOW commands do
NOTE
I didn't find in XA specs that an RM cannot return the same XID twice,
so mysql_xa_recover does not filter XID's to ensure uniqueness.
It can be easily fixed later, if necessary.
*/
bool mysql_xa_recover(THD *thd)
{
List<Item> field_list;
Protocol *protocol= thd->protocol;
int i=0;
XID_STATE *xs;
DBUG_ENTER("mysql_xa_recover");
field_list.push_back(new Item_int("formatID", 0, MY_INT32_NUM_DECIMAL_DIGITS));
field_list.push_back(new Item_int("gtrid_length", 0, MY_INT32_NUM_DECIMAL_DIGITS));
field_list.push_back(new Item_int("bqual_length", 0, MY_INT32_NUM_DECIMAL_DIGITS));
field_list.push_back(new Item_empty_string("data",XIDDATASIZE));
if (protocol->send_fields(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
DBUG_RETURN(1);
pthread_mutex_lock(&LOCK_xid_cache);
while ((xs= (XID_STATE*)hash_element(&xid_cache, i++)))
{
if (xs->xa_state==XA_PREPARED)
{
protocol->prepare_for_resend();
protocol->store_longlong((longlong)xs->xid.formatID, FALSE);
protocol->store_longlong((longlong)xs->xid.gtrid_length, FALSE);
protocol->store_longlong((longlong)xs->xid.bqual_length, FALSE);
protocol->store(xs->xid.data, xs->xid.gtrid_length+xs->xid.bqual_length,
&my_charset_bin);
if (protocol->write())
{
pthread_mutex_unlock(&LOCK_xid_cache);
DBUG_RETURN(1);
}
}
}
pthread_mutex_unlock(&LOCK_xid_cache);
send_eof(thd);
DBUG_RETURN(0);
}
/** @brief
This function should be called when MySQL sends rows of a SELECT result set
or the EOF mark to the client. It releases a possible adaptive hash index
S-latch held by thd in InnoDB and also releases a possible InnoDB query
FIFO ticket to enter InnoDB. To save CPU time, InnoDB allows a thd to
keep them over several calls of the InnoDB handler interface when a join
is executed. But when we let the control to pass to the client they have
to be released because if the application program uses mysql_use_result(),
it may deadlock on the S-latch if the application on another connection
performs another SQL query. In MySQL-4.1 this is even more important because
there a connection can have several SELECT queries open at the same time.
arguments:
thd: the thread handle of the current connection
return value: always 0
*/
static my_bool release_temporary_latches(THD *thd, plugin_ref plugin,
void *unused)
{
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES && hton->release_temporary_latches)
hton->release_temporary_latches(hton, thd);
return FALSE;
}
int ha_release_temporary_latches(THD *thd)
{
plugin_foreach(thd, release_temporary_latches, MYSQL_STORAGE_ENGINE_PLUGIN,
NULL);
return 0;
}
int ha_rollback_to_savepoint(THD *thd, SAVEPOINT *sv)
{
int error=0;
THD_TRANS *trans= (thd->in_sub_stmt ? &thd->transaction.stmt :
&thd->transaction.all);
handlerton **ht=trans->ht, **end_ht;
DBUG_ENTER("ha_rollback_to_savepoint");
trans->nht=sv->nht;
trans->no_2pc=0;
end_ht=ht+sv->nht;
/*
rolling back to savepoint in all storage engines that were part of the
transaction when the savepoint was set
*/
for (; ht < end_ht; ht++)
{
int err;
DBUG_ASSERT((*ht)->savepoint_set != 0);
if ((err= (*(*ht)->savepoint_rollback)(*ht, thd, (uchar *)(sv+1)+(*ht)->savepoint_offset)))
{ // cannot happen
my_error(ER_ERROR_DURING_ROLLBACK, MYF(0), err);
error=1;
}
status_var_increment(thd->status_var.ha_savepoint_rollback_count);
trans->no_2pc|=(*ht)->prepare == 0;
}
/*
rolling back the transaction in all storage engines that were not part of
the transaction when the savepoint was set
*/
for (; *ht ; ht++)
{
int err;
if ((err= (*(*ht)->rollback)(*ht, thd, !thd->in_sub_stmt)))
{ // cannot happen
my_error(ER_ERROR_DURING_ROLLBACK, MYF(0), err);
error=1;
}
status_var_increment(thd->status_var.ha_rollback_count);
*ht=0; // keep it conveniently zero-filled
}
DBUG_RETURN(error);
}
/** @brief
note, that according to the sql standard (ISO/IEC 9075-2:2003)
section "4.33.4 SQL-statements and transaction states",
SAVEPOINT is *not* transaction-initiating SQL-statement
*/
int ha_savepoint(THD *thd, SAVEPOINT *sv)
{
int error=0;
THD_TRANS *trans= (thd->in_sub_stmt ? &thd->transaction.stmt :
&thd->transaction.all);
handlerton **ht=trans->ht;
DBUG_ENTER("ha_savepoint");
#ifdef USING_TRANSACTIONS
for (; *ht; ht++)
{
int err;
if (! (*ht)->savepoint_set)
{
my_error(ER_CHECK_NOT_IMPLEMENTED, MYF(0), "SAVEPOINT");
error=1;
break;
}
if ((err= (*(*ht)->savepoint_set)(*ht, thd, (uchar *)(sv+1)+(*ht)->savepoint_offset)))
{ // cannot happen
my_error(ER_GET_ERRNO, MYF(0), err);
error=1;
}
status_var_increment(thd->status_var.ha_savepoint_count);
}
sv->nht=trans->nht;
#endif /* USING_TRANSACTIONS */
DBUG_RETURN(error);
}
int ha_release_savepoint(THD *thd, SAVEPOINT *sv)
{
int error=0;
THD_TRANS *trans= (thd->in_sub_stmt ? &thd->transaction.stmt :
&thd->transaction.all);
handlerton **ht=trans->ht, **end_ht;
DBUG_ENTER("ha_release_savepoint");
end_ht=ht+sv->nht;
for (; ht < end_ht; ht++)
{
int err;
if (!(*ht)->savepoint_release)
continue;
if ((err= (*(*ht)->savepoint_release)(*ht, thd,
(uchar *)(sv+1)+
(*ht)->savepoint_offset)))
{ // cannot happen
my_error(ER_GET_ERRNO, MYF(0), err);
error=1;
}
}
DBUG_RETURN(error);
}
static my_bool snapshot_handlerton(THD *thd, plugin_ref plugin,
void *arg)
{
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES &&
hton->start_consistent_snapshot)
{
hton->start_consistent_snapshot(hton, thd);
*((bool *)arg)= false;
}
return FALSE;
}
int ha_start_consistent_snapshot(THD *thd)
{
bool warn= true;
plugin_foreach(thd, snapshot_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN, &warn);
/*
Same idea as when one wants to CREATE TABLE in one engine which does not
exist:
*/
if (warn)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
"This MySQL server does not support any "
"consistent-read capable storage engine");
return 0;
}
static my_bool flush_handlerton(THD *thd, plugin_ref plugin,
void *arg)
{
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES && hton->flush_logs &&
hton->flush_logs(hton))
return TRUE;
return FALSE;
}
bool ha_flush_logs(handlerton *db_type)
{
if (db_type == NULL)
{
if (plugin_foreach(NULL, flush_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, 0))
return TRUE;
}
else
{
if (db_type->state != SHOW_OPTION_YES ||
(db_type->flush_logs && db_type->flush_logs(db_type)))
return TRUE;
}
return FALSE;
}
static const char *check_lowercase_names(handler *file, const char *path,
char *tmp_path)
{
if (lower_case_table_names != 2 || (file->ha_table_flags() & HA_FILE_BASED))
return path;
/* Ensure that table handler get path in lower case */
if (tmp_path != path)
strmov(tmp_path, path);
/*
we only should turn into lowercase database/table part
so start the process after homedirectory
*/
my_casedn_str(files_charset_info, tmp_path + mysql_data_home_len);
return tmp_path;
}
/** @brief
This should return ENOENT if the file doesn't exists.
The .frm file will be deleted only if we return 0 or ENOENT
*/
int ha_delete_table(THD *thd, handlerton *table_type, const char *path,
const char *db, const char *alias, bool generate_warning)
{
handler *file;
char tmp_path[FN_REFLEN];
int error;
TABLE dummy_table;
TABLE_SHARE dummy_share;
DBUG_ENTER("ha_delete_table");
bzero((char*) &dummy_table, sizeof(dummy_table));
bzero((char*) &dummy_share, sizeof(dummy_share));
dummy_table.s= &dummy_share;
/* DB_TYPE_UNKNOWN is used in ALTER TABLE when renaming only .frm files */
if (table_type == NULL ||
! (file=get_new_handler((TABLE_SHARE*)0, thd->mem_root, table_type)))
DBUG_RETURN(ENOENT);
path= check_lowercase_names(file, path, tmp_path);
if ((error= file->delete_table(path)) && generate_warning)
{
/*
Because file->print_error() use my_error() to generate the error message
we must store the error state in thd, reset it and restore it to
be able to get hold of the error message.
(We should in the future either rewrite handler::print_error() or make
a nice method of this.
*/
bool query_error= thd->query_error;
sp_rcontext *spcont= thd->spcont;
SELECT_LEX *current_select= thd->lex->current_select;
char buff[sizeof(thd->net.last_error)];
char new_error[sizeof(thd->net.last_error)];
int last_errno= thd->net.last_errno;
strmake(buff, thd->net.last_error, sizeof(buff)-1);
thd->query_error= 0;
thd->spcont= NULL;
thd->lex->current_select= 0;
thd->net.last_error[0]= 0;
/* Fill up strucutures that print_error may need */
dummy_share.path.str= (char*) path;
dummy_share.path.length= strlen(path);
dummy_share.db.str= (char*) db;
dummy_share.db.length= strlen(db);
dummy_share.table_name.str= (char*) alias;
dummy_share.table_name.length= strlen(alias);
dummy_table.alias= alias;
file->table_share= &dummy_share;
file->table= &dummy_table;
file->print_error(error, 0);
strmake(new_error, thd->net.last_error, sizeof(buff)-1);
/* restore thd */
thd->query_error= query_error;
thd->spcont= spcont;
thd->lex->current_select= current_select;
thd->net.last_errno= last_errno;
strmake(thd->net.last_error, buff, sizeof(buff)-1);
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, error, new_error);
}
delete file;
DBUG_RETURN(error);
}
/****************************************************************************
** General handler functions
****************************************************************************/
handler *handler::clone(MEM_ROOT *mem_root)
{
handler *new_handler= get_new_handler(table->s, mem_root, table->s->db_type());
if (new_handler && !new_handler->ha_open(table,
table->s->normalized_path.str,
table->db_stat,
HA_OPEN_IGNORE_IF_LOCKED))
return new_handler;
return NULL;
}
void handler::ha_statistic_increment(ulong SSV::*offset) const
{
status_var_increment(table->in_use->status_var.*offset);
}
void **handler::ha_data(THD *thd) const
{
return thd_ha_data(thd, ht);
}
THD *handler::ha_thd(void) const
{
DBUG_ASSERT(!table || !table->in_use || table->in_use == current_thd);
return (table && table->in_use) ? table->in_use : current_thd;
}
/** @brief
Open database-handler.
IMPLEMENTATION
Try O_RDONLY if cannot open as O_RDWR
Don't wait for locks if not HA_OPEN_WAIT_IF_LOCKED is set
*/
int handler::ha_open(TABLE *table_arg, const char *name, int mode,
int test_if_locked)
{
int error;
DBUG_ENTER("handler::ha_open");
DBUG_PRINT("enter",
("name: %s db_type: %d db_stat: %d mode: %d lock_test: %d",
name, ht->db_type, table_arg->db_stat, mode,
test_if_locked));
table= table_arg;
DBUG_ASSERT(table->s == table_share);
DBUG_ASSERT(alloc_root_inited(&table->mem_root));
if ((error=open(name,mode,test_if_locked)))
{
if ((error == EACCES || error == EROFS) && mode == O_RDWR &&
(table->db_stat & HA_TRY_READ_ONLY))
{
table->db_stat|=HA_READ_ONLY;
error=open(name,O_RDONLY,test_if_locked);
}
}
if (error)
{
my_errno= error; /* Safeguard */
DBUG_PRINT("error",("error: %d errno: %d",error,errno));
}
else
{
if (table->s->db_options_in_use & HA_OPTION_READ_ONLY_DATA)
table->db_stat|=HA_READ_ONLY;
(void) extra(HA_EXTRA_NO_READCHECK); // Not needed in SQL
if (!(ref= (uchar*) alloc_root(&table->mem_root, ALIGN_SIZE(ref_length)*2)))
{
close();
error=HA_ERR_OUT_OF_MEM;
}
else
dup_ref=ref+ALIGN_SIZE(ref_length);
cached_table_flags= table_flags();
}
DBUG_RETURN(error);
}
/** @brief
Read first row (only) from a table
This is never called for InnoDB tables, as these table types
has the HA_STATS_RECORDS_IS_EXACT set.
*/
int handler::read_first_row(uchar * buf, uint primary_key)
{
register int error;
DBUG_ENTER("handler::read_first_row");
ha_statistic_increment(&SSV::ha_read_first_count);
/*
If there is very few deleted rows in the table, find the first row by
scanning the table.
TODO remove the test for HA_READ_ORDER
*/
if (stats.deleted < 10 || primary_key >= MAX_KEY ||
!(index_flags(primary_key, 0, 0) & HA_READ_ORDER))
{
(void) ha_rnd_init(1);
while ((error= rnd_next(buf)) == HA_ERR_RECORD_DELETED) ;
(void) ha_rnd_end();
}
else
{
/* Find the first row through the primary key */
(void) ha_index_init(primary_key, 0);
error=index_first(buf);
(void) ha_index_end();
}
DBUG_RETURN(error);
}
/** @brief
Generate the next auto-increment number based on increment and offset:
computes the lowest number
- strictly greater than "nr"
- of the form: auto_increment_offset + N * auto_increment_increment
In most cases increment= offset= 1, in which case we get:
1,2,3,4,5,...
If increment=10 and offset=5 and previous number is 1, we get:
1,5,15,25,35,...
*/
inline ulonglong
compute_next_insert_id(ulonglong nr,struct system_variables *variables)
{
if (variables->auto_increment_increment == 1)
return (nr+1); // optimization of the formula below
nr= (((nr+ variables->auto_increment_increment -
variables->auto_increment_offset)) /
(ulonglong) variables->auto_increment_increment);
return (nr* (ulonglong) variables->auto_increment_increment +
variables->auto_increment_offset);
}
void handler::adjust_next_insert_id_after_explicit_value(ulonglong nr)
{
/*
If we have set THD::next_insert_id previously and plan to insert an
explicitely-specified value larger than this, we need to increase
THD::next_insert_id to be greater than the explicit value.
*/
if ((next_insert_id > 0) && (nr >= next_insert_id))
set_next_insert_id(compute_next_insert_id(nr, &table->in_use->variables));
}
/** @brief
Computes the largest number X:
- smaller than or equal to "nr"
- of the form: auto_increment_offset + N * auto_increment_increment
where N>=0.
SYNOPSIS
prev_insert_id
nr Number to "round down"
variables variables struct containing auto_increment_increment and
auto_increment_offset
RETURN
The number X if it exists, "nr" otherwise.
*/
inline ulonglong
prev_insert_id(ulonglong nr, struct system_variables *variables)
{
if (unlikely(nr < variables->auto_increment_offset))
{
/*
There's nothing good we can do here. That is a pathological case, where
the offset is larger than the column's max possible value, i.e. not even
the first sequence value may be inserted. User will receive warning.
*/
DBUG_PRINT("info",("auto_increment: nr: %lu cannot honour "
"auto_increment_offset: %lu",
(ulong) nr, variables->auto_increment_offset));
return nr;
}
if (variables->auto_increment_increment == 1)
return nr; // optimization of the formula below
nr= (((nr - variables->auto_increment_offset)) /
(ulonglong) variables->auto_increment_increment);
return (nr * (ulonglong) variables->auto_increment_increment +
variables->auto_increment_offset);
}
/*
Update the auto_increment field if necessary
SYNOPSIS
update_auto_increment()
RETURN
0 ok
HA_ERR_AUTOINC_READ_FAILED
get_auto_increment() was called and returned ~(ulonglong) 0
HA_ERR_AUTOINC_ERANGE
storing value in field caused strict mode failure.
IMPLEMENTATION
Updates the record's Field of type NEXT_NUMBER if:
- If column value is set to NULL (in which case
auto_increment_field_not_null is 0)
- If column is set to 0 and (sql_mode & MODE_NO_AUTO_VALUE_ON_ZERO) is not
set. In the future we will only set NEXT_NUMBER fields if one sets them
to NULL (or they are not included in the insert list).
In those cases, we check if the currently reserved interval still has
values we have not used. If yes, we pick the smallest one and use it.
Otherwise:
- If a list of intervals has been provided to the statement via SET
INSERT_ID or via an Intvar_log_event (in a replication slave), we pick the
first unused interval from this list, consider it as reserved.
- Otherwise we set the column for the first row to the value
next_insert_id(get_auto_increment(column))) which is usually
max-used-column-value+1.
We call get_auto_increment() for the first row in a multi-row
statement. get_auto_increment() will tell us the interval of values it
reserved for us.
- In both cases, for the following rows we use those reserved values without
calling the handler again (we just progress in the interval, computing
each new value from the previous one). Until we have exhausted them, then
we either take the next provided interval or call get_auto_increment()
again to reserve a new interval.
- In both cases, the reserved intervals are remembered in
thd->auto_inc_intervals_in_cur_stmt_for_binlog if statement-based
binlogging; the last reserved interval is remembered in
auto_inc_interval_for_cur_row.
The idea is that generated auto_increment values are predictable and
independent of the column values in the table. This is needed to be
able to replicate into a table that already has rows with a higher
auto-increment value than the one that is inserted.
After we have already generated an auto-increment number and the user
inserts a column with a higher value than the last used one, we will
start counting from the inserted value.
This function's "outputs" are: the table's auto_increment field is filled
with a value, thd->next_insert_id is filled with the value to use for the
next row, if a value was autogenerated for the current row it is stored in
thd->insert_id_for_cur_row, if get_auto_increment() was called
thd->auto_inc_interval_for_cur_row is modified, if that interval is not
present in thd->auto_inc_intervals_in_cur_stmt_for_binlog it is added to
this list.
TODO
Replace all references to "next number" or NEXT_NUMBER to
"auto_increment", everywhere (see below: there is
table->auto_increment_field_not_null, and there also exists
table->next_number_field, it's not consistent).
*/
#define AUTO_INC_DEFAULT_NB_ROWS 1 // Some prefer 1024 here
#define AUTO_INC_DEFAULT_NB_MAX_BITS 16
#define AUTO_INC_DEFAULT_NB_MAX ((1 << AUTO_INC_DEFAULT_NB_MAX_BITS) - 1)
int handler::update_auto_increment()
{
ulonglong nr, nb_reserved_values;
bool append= FALSE;
THD *thd= table->in_use;
struct system_variables *variables= &thd->variables;
DBUG_ENTER("handler::update_auto_increment");
/*
next_insert_id is a "cursor" into the reserved interval, it may go greater
than the interval, but not smaller.
*/
DBUG_ASSERT(next_insert_id >= auto_inc_interval_for_cur_row.minimum());
if ((nr= table->next_number_field->val_int()) != 0 ||
table->auto_increment_field_not_null &&
thd->variables.sql_mode & MODE_NO_AUTO_VALUE_ON_ZERO)
{
/*
Update next_insert_id if we had already generated a value in this
statement (case of INSERT VALUES(null),(3763),(null):
the last NULL needs to insert 3764, not the value of the first NULL plus
1).
*/
adjust_next_insert_id_after_explicit_value(nr);
insert_id_for_cur_row= 0; // didn't generate anything
DBUG_RETURN(0);
}
if ((nr= next_insert_id) >= auto_inc_interval_for_cur_row.maximum())
{
/* next_insert_id is beyond what is reserved, so we reserve more. */
const Discrete_interval *forced=
thd->auto_inc_intervals_forced.get_next();
if (forced != NULL)
{
nr= forced->minimum();
nb_reserved_values= forced->values();
}
else
{
/*
handler::estimation_rows_to_insert was set by
handler::ha_start_bulk_insert(); if 0 it means "unknown".
*/
uint nb_already_reserved_intervals=
thd->auto_inc_intervals_in_cur_stmt_for_binlog.nb_elements();
ulonglong nb_desired_values;
/*
If an estimation was given to the engine:
- use it.
- if we already reserved numbers, it means the estimation was
not accurate, then we'll reserve 2*AUTO_INC_DEFAULT_NB_ROWS the 2nd
time, twice that the 3rd time etc.
If no estimation was given, use those increasing defaults from the
start, starting from AUTO_INC_DEFAULT_NB_ROWS.
Don't go beyond a max to not reserve "way too much" (because
reservation means potentially losing unused values).
*/
if (nb_already_reserved_intervals == 0 &&
(estimation_rows_to_insert > 0))
nb_desired_values= estimation_rows_to_insert;
else /* go with the increasing defaults */
{
/* avoid overflow in formula, with this if() */
if (nb_already_reserved_intervals <= AUTO_INC_DEFAULT_NB_MAX_BITS)
{
nb_desired_values= AUTO_INC_DEFAULT_NB_ROWS *
(1 << nb_already_reserved_intervals);
set_if_smaller(nb_desired_values, AUTO_INC_DEFAULT_NB_MAX);
}
else
nb_desired_values= AUTO_INC_DEFAULT_NB_MAX;
}
/* This call ignores all its parameters but nr, currently */
get_auto_increment(variables->auto_increment_offset,
variables->auto_increment_increment,
nb_desired_values, &nr,
&nb_reserved_values);
if (nr == ~(ulonglong) 0)
DBUG_RETURN(HA_ERR_AUTOINC_READ_FAILED); // Mark failure
/*
That rounding below should not be needed when all engines actually
respect offset and increment in get_auto_increment(). But they don't
so we still do it. Wonder if for the not-first-in-index we should do
it. Hope that this rounding didn't push us out of the interval; even
if it did we cannot do anything about it (calling the engine again
will not help as we inserted no row).
*/
nr= compute_next_insert_id(nr-1, variables);
}
if (table->s->next_number_keypart == 0)
{
/* We must defer the appending until "nr" has been possibly truncated */
append= TRUE;
}
else
{
/*
For such auto_increment there is no notion of interval, just a
singleton. The interval is not even stored in
thd->auto_inc_interval_for_cur_row, so we are sure to call the engine
for next row.
*/
DBUG_PRINT("info",("auto_increment: special not-first-in-index"));
}
}
DBUG_PRINT("info",("auto_increment: %lu", (ulong) nr));
if (unlikely(table->next_number_field->store((longlong) nr, TRUE)))
{
/*
first test if the query was aborted due to strict mode constraints
*/
if (thd->killed == THD::KILL_BAD_DATA)
DBUG_RETURN(HA_ERR_AUTOINC_ERANGE);
/*
field refused this value (overflow) and truncated it, use the result of
the truncation (which is going to be inserted); however we try to
decrease it to honour auto_increment_* variables.
That will shift the left bound of the reserved interval, we don't
bother shifting the right bound (anyway any other value from this
interval will cause a duplicate key).
*/
nr= prev_insert_id(table->next_number_field->val_int(), variables);
if (unlikely(table->next_number_field->store((longlong) nr, TRUE)))
nr= table->next_number_field->val_int();
}
if (append)
{
auto_inc_interval_for_cur_row.replace(nr, nb_reserved_values,
variables->auto_increment_increment);
/* Row-based replication does not need to store intervals in binlog */
if (!thd->current_stmt_binlog_row_based)
thd->auto_inc_intervals_in_cur_stmt_for_binlog.append(auto_inc_interval_for_cur_row.minimum(),
auto_inc_interval_for_cur_row.values(),
variables->auto_increment_increment);
}
/*
Record this autogenerated value. If the caller then
succeeds to insert this value, it will call
record_first_successful_insert_id_in_cur_stmt()
which will set first_successful_insert_id_in_cur_stmt if it's not
already set.
*/
insert_id_for_cur_row= nr;
/*
Set next insert id to point to next auto-increment value to be able to
handle multi-row statements.
*/
set_next_insert_id(compute_next_insert_id(nr, variables));
DBUG_RETURN(0);
}
/** @brief
MySQL signal that it changed the column bitmap
USAGE
This is for handlers that needs to setup their own column bitmaps.
Normally the handler should set up their own column bitmaps in
index_init() or rnd_init() and in any column_bitmaps_signal() call after
this.
The handler is allowd to do changes to the bitmap after a index_init or
rnd_init() call is made as after this, MySQL will not use the bitmap
for any program logic checking.
*/
void handler::column_bitmaps_signal()
{
DBUG_ENTER("column_bitmaps_signal");
DBUG_PRINT("info", ("read_set: 0x%lx write_set: 0x%lx", (long) table->read_set,
(long) table->write_set));
DBUG_VOID_RETURN;
}
/** @brief
Reserves an interval of auto_increment values from the handler.
SYNOPSIS
get_auto_increment()
offset
increment
nb_desired_values how many values we want
first_value (OUT) the first value reserved by the handler
nb_reserved_values (OUT) how many values the handler reserved
offset and increment means that we want values to be of the form
offset + N * increment, where N>=0 is integer.
If the function sets *first_value to ~(ulonglong)0 it means an error.
If the function sets *nb_reserved_values to ULONGLONG_MAX it means it has
reserved to "positive infinite".
*/
void handler::get_auto_increment(ulonglong offset, ulonglong increment,
ulonglong nb_desired_values,
ulonglong *first_value,
ulonglong *nb_reserved_values)
{
ulonglong nr;
int error;
(void) extra(HA_EXTRA_KEYREAD);
table->mark_columns_used_by_index_no_reset(table->s->next_number_index,
table->read_set);
column_bitmaps_signal();
index_init(table->s->next_number_index, 1);
if (table->s->next_number_keypart == 0)
{ // Autoincrement at key-start
error=index_last(table->record[1]);
/*
MySQL implicitely assumes such method does locking (as MySQL decides to
use nr+increment without checking again with the handler, in
handler::update_auto_increment()), so reserves to infinite.
*/
*nb_reserved_values= ULONGLONG_MAX;
}
else
{
uchar key[MAX_KEY_LENGTH];
key_copy(key, table->record[0],
table->key_info + table->s->next_number_index,
table->s->next_number_key_offset);
error= index_read_map(table->record[1], key,
make_prev_keypart_map(table->s->next_number_keypart),
HA_READ_PREFIX_LAST);
/*
MySQL needs to call us for next row: assume we are inserting ("a",null)
here, we return 3, and next this statement will want to insert
("b",null): there is no reason why ("b",3+1) would be the good row to
insert: maybe it already exists, maybe 3+1 is too large...
*/
*nb_reserved_values= 1;
}
if (error)
nr=1;
else
nr= ((ulonglong) table->next_number_field->
val_int_offset(table->s->rec_buff_length)+1);
index_end();
(void) extra(HA_EXTRA_NO_KEYREAD);
*first_value= nr;
}
void handler::ha_release_auto_increment()
{
release_auto_increment();
insert_id_for_cur_row= 0;
auto_inc_interval_for_cur_row.replace(0, 0, 0);
if (next_insert_id > 0)
{
next_insert_id= 0;
/*
this statement used forced auto_increment values if there were some,
wipe them away for other statements.
*/
table->in_use->auto_inc_intervals_forced.empty();
}
}
void handler::print_keydup_error(uint key_nr, const char *msg)
{
/* Write the duplicated key in the error message */
char key[MAX_KEY_LENGTH];
String str(key,sizeof(key),system_charset_info);
if (key_nr == MAX_KEY)
{
/* Key is unknown */
str.copy("", 0, system_charset_info);
my_printf_error(ER_DUP_ENTRY, msg, MYF(0), str.c_ptr(), "*UNKNOWN*");
}
else
{
/* Table is opened and defined at this point */
key_unpack(&str,table,(uint) key_nr);
uint max_length=MYSQL_ERRMSG_SIZE-(uint) strlen(msg);
if (str.length() >= max_length)
{
str.length(max_length-4);
str.append(STRING_WITH_LEN("..."));
}
my_printf_error(ER_DUP_ENTRY, msg,
MYF(0), str.c_ptr(), table->key_info[key_nr].name);
}
}
/** @brief
Print error that we got from handler function
NOTE
In case of delete table it's only safe to use the following parts of
the 'table' structure:
table->s->path
table->alias
*/
void handler::print_error(int error, myf errflag)
{
DBUG_ENTER("handler::print_error");
DBUG_PRINT("enter",("error: %d",error));
int textno=ER_GET_ERRNO;
switch (error) {
case EACCES:
textno=ER_OPEN_AS_READONLY;
break;
case EAGAIN:
textno=ER_FILE_USED;
break;
case ENOENT:
textno=ER_FILE_NOT_FOUND;
break;
case HA_ERR_KEY_NOT_FOUND:
case HA_ERR_NO_ACTIVE_RECORD:
case HA_ERR_END_OF_FILE:
textno=ER_KEY_NOT_FOUND;
break;
case HA_ERR_WRONG_MRG_TABLE_DEF:
textno=ER_WRONG_MRG_TABLE;
break;
case HA_ERR_FOUND_DUPP_KEY:
{
uint key_nr=get_dup_key(error);
if ((int) key_nr >= 0)
{
print_keydup_error(key_nr, ER(ER_DUP_ENTRY_WITH_KEY_NAME));
DBUG_VOID_RETURN;
}
textno=ER_DUP_KEY;
break;
}
case HA_ERR_FOREIGN_DUPLICATE_KEY:
{
uint key_nr= get_dup_key(error);
if ((int) key_nr >= 0)
{
uint max_length;
/* Write the key in the error message */
char key[MAX_KEY_LENGTH];
String str(key,sizeof(key),system_charset_info);
/* Table is opened and defined at this point */
key_unpack(&str,table,(uint) key_nr);
max_length= (MYSQL_ERRMSG_SIZE-
(uint) strlen(ER(ER_FOREIGN_DUPLICATE_KEY)));
if (str.length() >= max_length)
{
str.length(max_length-4);
str.append(STRING_WITH_LEN("..."));
}
my_error(ER_FOREIGN_DUPLICATE_KEY, MYF(0), table_share->table_name.str,
str.c_ptr(), key_nr+1);
DBUG_VOID_RETURN;
}
textno= ER_DUP_KEY;
break;
}
case HA_ERR_NULL_IN_SPATIAL:
my_error(ER_CANT_CREATE_GEOMETRY_OBJECT, MYF(0));
DBUG_VOID_RETURN;
case HA_ERR_FOUND_DUPP_UNIQUE:
textno=ER_DUP_UNIQUE;
break;
case HA_ERR_RECORD_CHANGED:
textno=ER_CHECKREAD;
break;
case HA_ERR_CRASHED:
textno=ER_NOT_KEYFILE;
break;
case HA_ERR_WRONG_IN_RECORD:
textno= ER_CRASHED_ON_USAGE;
break;
case HA_ERR_CRASHED_ON_USAGE:
textno=ER_CRASHED_ON_USAGE;
break;
case HA_ERR_NOT_A_TABLE:
textno= error;
break;
case HA_ERR_CRASHED_ON_REPAIR:
textno=ER_CRASHED_ON_REPAIR;
break;
case HA_ERR_OUT_OF_MEM:
textno=ER_OUT_OF_RESOURCES;
break;
case HA_ERR_WRONG_COMMAND:
textno=ER_ILLEGAL_HA;
break;
case HA_ERR_OLD_FILE:
textno=ER_OLD_KEYFILE;
break;
case HA_ERR_UNSUPPORTED:
textno=ER_UNSUPPORTED_EXTENSION;
break;
case HA_ERR_RECORD_FILE_FULL:
case HA_ERR_INDEX_FILE_FULL:
textno=ER_RECORD_FILE_FULL;
break;
case HA_ERR_LOCK_WAIT_TIMEOUT:
textno=ER_LOCK_WAIT_TIMEOUT;
break;
case HA_ERR_LOCK_TABLE_FULL:
textno=ER_LOCK_TABLE_FULL;
break;
case HA_ERR_LOCK_DEADLOCK:
textno=ER_LOCK_DEADLOCK;
break;
case HA_ERR_READ_ONLY_TRANSACTION:
textno=ER_READ_ONLY_TRANSACTION;
break;
case HA_ERR_CANNOT_ADD_FOREIGN:
textno=ER_CANNOT_ADD_FOREIGN;
break;
case HA_ERR_ROW_IS_REFERENCED:
{
String str;
get_error_message(error, &str);
my_error(ER_ROW_IS_REFERENCED_2, MYF(0), str.c_ptr_safe());
DBUG_VOID_RETURN;
}
case HA_ERR_NO_REFERENCED_ROW:
{
String str;
get_error_message(error, &str);
my_error(ER_NO_REFERENCED_ROW_2, MYF(0), str.c_ptr_safe());
DBUG_VOID_RETURN;
}
case HA_ERR_TABLE_DEF_CHANGED:
textno=ER_TABLE_DEF_CHANGED;
break;
case HA_ERR_NO_SUCH_TABLE:
my_error(ER_NO_SUCH_TABLE, MYF(0), table_share->db.str,
table_share->table_name.str);
break;
case HA_ERR_RBR_LOGGING_FAILED:
textno= ER_BINLOG_ROW_LOGGING_FAILED;
break;
case HA_ERR_DROP_INDEX_FK:
{
const char *ptr= "???";
uint key_nr= get_dup_key(error);
if ((int) key_nr >= 0)
ptr= table->key_info[key_nr].name;
my_error(ER_DROP_INDEX_FK, MYF(0), ptr);
DBUG_VOID_RETURN;
}
case HA_ERR_TABLE_NEEDS_UPGRADE:
textno=ER_TABLE_NEEDS_UPGRADE;
break;
case HA_ERR_TABLE_READONLY:
textno= ER_OPEN_AS_READONLY;
break;
case HA_ERR_AUTOINC_READ_FAILED:
textno= ER_AUTOINC_READ_FAILED;
break;
case HA_ERR_AUTOINC_ERANGE:
textno= ER_WARN_DATA_OUT_OF_RANGE;
break;
default:
{
/* The error was "unknown" to this function.
Ask handler if it has got a message for this error */
bool temporary= FALSE;
String str;
temporary= get_error_message(error, &str);
if (!str.is_empty())
{
const char* engine= table_type();
if (temporary)
my_error(ER_GET_TEMPORARY_ERRMSG, MYF(0), error, str.ptr(), engine);
else
my_error(ER_GET_ERRMSG, MYF(0), error, str.ptr(), engine);
}
else
my_error(ER_GET_ERRNO,errflag,error);
DBUG_VOID_RETURN;
}
}
my_error(textno, errflag, table_share->table_name.str, error);
DBUG_VOID_RETURN;
}
/** @brief
Return an error message specific to this handler
SYNOPSIS
error error code previously returned by handler
buf Pointer to String where to add error message
Returns true if this is a temporary error
*/
bool handler::get_error_message(int error, String* buf)
{
return FALSE;
}
int handler::ha_check_for_upgrade(HA_CHECK_OPT *check_opt)
{
KEY *keyinfo, *keyend;
KEY_PART_INFO *keypart, *keypartend;
if (!table->s->mysql_version)
{
/* check for blob-in-key error */
keyinfo= table->key_info;
keyend= table->key_info + table->s->keys;
for (; keyinfo < keyend; keyinfo++)
{
keypart= keyinfo->key_part;
keypartend= keypart + keyinfo->key_parts;
for (; keypart < keypartend; keypart++)
{
if (!keypart->fieldnr)
continue;
Field *field= table->field[keypart->fieldnr-1];
if (field->type() == MYSQL_TYPE_BLOB)
{
if (check_opt->sql_flags & TT_FOR_UPGRADE)
check_opt->flags= T_MEDIUM;
return HA_ADMIN_NEEDS_CHECK;
}
}
}
}
return check_for_upgrade(check_opt);
}
int handler::check_old_types()
{
Field** field;
if (!table->s->mysql_version)
{
/* check for bad DECIMAL field */
for (field= table->field; (*field); field++)
{
if ((*field)->type() == MYSQL_TYPE_NEWDECIMAL)
{
return HA_ADMIN_NEEDS_ALTER;
}
if ((*field)->type() == MYSQL_TYPE_VAR_STRING)
{
return HA_ADMIN_NEEDS_ALTER;
}
}
}
return 0;
}
static bool update_frm_version(TABLE *table)
{
char path[FN_REFLEN];
File file;
int result= 1;
DBUG_ENTER("update_frm_version");
/*
No need to update frm version in case table was created or checked
by server with the same version. This also ensures that we do not
update frm version for temporary tables as this code doesn't support
temporary tables.
*/
if (table->s->mysql_version == MYSQL_VERSION_ID)
DBUG_RETURN(0);
strxmov(path, table->s->normalized_path.str, reg_ext, NullS);
if ((file= my_open(path, O_RDWR|O_BINARY, MYF(MY_WME))) >= 0)
{
uchar version[4];
char *key= table->s->table_cache_key.str;
uint key_length= table->s->table_cache_key.length;
TABLE *entry;
HASH_SEARCH_STATE state;
int4store(version, MYSQL_VERSION_ID);
if ((result= my_pwrite(file,(uchar*) version,4,51L,MYF_RW)))
goto err;
for (entry=(TABLE*) hash_first(&open_cache,(uchar*) key,key_length, &state);
entry;
entry= (TABLE*) hash_next(&open_cache,(uchar*) key,key_length, &state))
entry->s->mysql_version= MYSQL_VERSION_ID;
}
err:
if (file >= 0)
VOID(my_close(file,MYF(MY_WME)));
DBUG_RETURN(result);
}
/** @brief
Return key if error because of duplicated keys */
uint handler::get_dup_key(int error)
{
DBUG_ENTER("handler::get_dup_key");
table->file->errkey = (uint) -1;
if (error == HA_ERR_FOUND_DUPP_KEY || error == HA_ERR_FOREIGN_DUPLICATE_KEY ||
error == HA_ERR_FOUND_DUPP_UNIQUE || error == HA_ERR_NULL_IN_SPATIAL ||
error == HA_ERR_DROP_INDEX_FK)
info(HA_STATUS_ERRKEY | HA_STATUS_NO_LOCK);
DBUG_RETURN(table->file->errkey);
}
/** @brief
Delete all files with extension from bas_ext()
SYNOPSIS
delete_table()
name Base name of table
NOTES
We assume that the handler may return more extensions than
was actually used for the file.
RETURN
0 If we successfully deleted at least one file from base_ext and
didn't get any other errors than ENOENT
# Error
*/
int handler::delete_table(const char *name)
{
int error= 0;
int enoent_or_zero= ENOENT; // Error if no file was deleted
char buff[FN_REFLEN];
for (const char **ext=bas_ext(); *ext ; ext++)
{
fn_format(buff, name, "", *ext, MY_UNPACK_FILENAME|MY_APPEND_EXT);
if (my_delete_with_symlink(buff, MYF(0)))
{
if ((error= my_errno) != ENOENT)
break;
}
else
enoent_or_zero= 0; // No error for ENOENT
error= enoent_or_zero;
}
return error;
}
int handler::rename_table(const char * from, const char * to)
{
int error= 0;
for (const char **ext= bas_ext(); *ext ; ext++)
{
if (rename_file_ext(from, to, *ext))
{
if ((error=my_errno) != ENOENT)
break;
error= 0;
}
}
return error;
}
void handler::drop_table(const char *name)
{
close();
delete_table(name);
}
/** @brief
Performs checks upon the table.
SYNOPSIS
check()
thd thread doing CHECK TABLE operation
check_opt options from the parser
NOTES
RETURN
HA_ADMIN_OK Successful upgrade
HA_ADMIN_NEEDS_UPGRADE Table has structures requiring upgrade
HA_ADMIN_NEEDS_ALTER Table has structures requiring ALTER TABLE
HA_ADMIN_NOT_IMPLEMENTED
*/
int handler::ha_check(THD *thd, HA_CHECK_OPT *check_opt)
{
int error;
if ((table->s->mysql_version >= MYSQL_VERSION_ID) &&
(check_opt->sql_flags & TT_FOR_UPGRADE))
return 0;
if (table->s->mysql_version < MYSQL_VERSION_ID)
{
if ((error= check_old_types()))
return error;
error= ha_check_for_upgrade(check_opt);
if (error && (error != HA_ADMIN_NEEDS_CHECK))
return error;
if (!error && (check_opt->sql_flags & TT_FOR_UPGRADE))
return 0;
}
if ((error= check(thd, check_opt)))
return error;
return update_frm_version(table);
}
int handler::ha_repair(THD* thd, HA_CHECK_OPT* check_opt)
{
int result;
if ((result= repair(thd, check_opt)))
return result;
return update_frm_version(table);
}
/** @brief
Tell the storage engine that it is allowed to "disable transaction" in the
handler. It is a hint that ACID is not required - it is used in NDB for
ALTER TABLE, for example, when data are copied to temporary table.
A storage engine may treat this hint any way it likes. NDB for example
starts to commit every now and then automatically.
This hint can be safely ignored.
*/
int ha_enable_transaction(THD *thd, bool on)
{
int error=0;
DBUG_ENTER("ha_enable_transaction");
thd->transaction.on= on;
if (on)
{
/*
Now all storage engines should have transaction handling enabled.
But some may have it enabled all the time - "disabling" transactions
is an optimization hint that storage engine is free to ignore.
So, let's commit an open transaction (if any) now.
*/
if (!(error= ha_commit_stmt(thd)))
error= end_trans(thd, COMMIT);
}
DBUG_RETURN(error);
}
int handler::index_next_same(uchar *buf, const uchar *key, uint keylen)
{
int error;
if (!(error=index_next(buf)))
{
if (key_cmp_if_same(table, key, active_index, keylen))
{
table->status=STATUS_NOT_FOUND;
error=HA_ERR_END_OF_FILE;
}
}
return error;
}
void handler::get_dynamic_partition_info(PARTITION_INFO *stat_info,
uint part_id)
{
info(HA_STATUS_CONST | HA_STATUS_TIME | HA_STATUS_VARIABLE |
HA_STATUS_NO_LOCK);
stat_info->records= stats.records;
stat_info->mean_rec_length= stats.mean_rec_length;
stat_info->data_file_length= stats.data_file_length;
stat_info->max_data_file_length= stats.max_data_file_length;
stat_info->index_file_length= stats.index_file_length;
stat_info->delete_length= stats.delete_length;
stat_info->create_time= stats.create_time;
stat_info->update_time= stats.update_time;
stat_info->check_time= stats.check_time;
stat_info->check_sum= 0;
if (table_flags() & (ulong) HA_HAS_CHECKSUM)
stat_info->check_sum= checksum();
return;
}
/****************************************************************************
** Some general functions that isn't in the handler class
****************************************************************************/
/** @brief
Initiates table-file and calls appropriate database-creator
NOTES
We must have a write lock on LOCK_open to be sure no other thread
interferes with table
RETURN
0 ok
1 error
*/
int ha_create_table(THD *thd, const char *path,
const char *db, const char *table_name,
HA_CREATE_INFO *create_info,
bool update_create_info)
{
int error= 1;
TABLE table;
char name_buff[FN_REFLEN];
const char *name;
TABLE_SHARE share;
DBUG_ENTER("ha_create_table");
init_tmp_table_share(&share, db, 0, table_name, path);
if (open_table_def(thd, &share, 0) ||
open_table_from_share(thd, &share, "", 0, (uint) READ_ALL, 0, &table,
TRUE))
goto err;
if (update_create_info)
update_create_info_from_table(create_info, &table);
name= check_lowercase_names(table.file, share.path.str, name_buff);
error= table.file->create(name, &table, create_info);
VOID(closefrm(&table, 0));
if (error)
{
strxmov(name_buff, db, ".", table_name, NullS);
my_error(ER_CANT_CREATE_TABLE, MYF(ME_BELL+ME_WAITTANG), name_buff, error);
}
err:
free_table_share(&share);
DBUG_RETURN(error != 0);
}
/** @brief
Try to discover table from engine
NOTES
If found, write the frm file to disk.
RETURN VALUES:
-1 Table did not exists
0 Table created ok
> 0 Error, table existed but could not be created
*/
int ha_create_table_from_engine(THD* thd, const char *db, const char *name)
{
int error;
uchar *frmblob;
size_t frmlen;
char path[FN_REFLEN];
HA_CREATE_INFO create_info;
TABLE table;
TABLE_SHARE share;
DBUG_ENTER("ha_create_table_from_engine");
DBUG_PRINT("enter", ("name '%s'.'%s'", db, name));
bzero((uchar*) &create_info,sizeof(create_info));
if ((error= ha_discover(thd, db, name, &frmblob, &frmlen)))
{
/* Table could not be discovered and thus not created */
DBUG_RETURN(error);
}
/*
Table exists in handler and could be discovered
frmblob and frmlen are set, write the frm to disk
*/
(void)strxnmov(path,FN_REFLEN-1,mysql_data_home,FN_ROOTDIR,
db,FN_ROOTDIR,name,NullS);
// Save the frm file
error= writefrm(path, frmblob, frmlen);
my_free(frmblob, MYF(0));
if (error)
DBUG_RETURN(2);
init_tmp_table_share(&share, db, 0, name, path);
if (open_table_def(thd, &share, 0))
{
DBUG_RETURN(3);
}
if (open_table_from_share(thd, &share, "" ,0, 0, 0, &table, FALSE))
{
free_table_share(&share);
DBUG_RETURN(3);
}
update_create_info_from_table(&create_info, &table);
create_info.table_options|= HA_OPTION_CREATE_FROM_ENGINE;
check_lowercase_names(table.file, path, path);
error=table.file->create(path,&table,&create_info);
VOID(closefrm(&table, 1));
DBUG_RETURN(error != 0);
}
void st_ha_check_opt::init()
{
flags= sql_flags= 0;
sort_buffer_size = current_thd->variables.myisam_sort_buff_size;
}
/*****************************************************************************
Key cache handling.
This code is only relevant for ISAM/MyISAM tables
key_cache->cache may be 0 only in the case where a key cache is not
initialized or when we where not able to init the key cache in a previous
call to ha_init_key_cache() (probably out of memory)
*****************************************************************************/
/** @brief
Init a key cache if it has not been initied before
*/
int ha_init_key_cache(const char *name, KEY_CACHE *key_cache)
{
DBUG_ENTER("ha_init_key_cache");
if (!key_cache->key_cache_inited)
{
pthread_mutex_lock(&LOCK_global_system_variables);
ulong tmp_buff_size= (ulong) key_cache->param_buff_size;
uint tmp_block_size= (uint) key_cache->param_block_size;
uint division_limit= key_cache->param_division_limit;
uint age_threshold= key_cache->param_age_threshold;
pthread_mutex_unlock(&LOCK_global_system_variables);
DBUG_RETURN(!init_key_cache(key_cache,
tmp_block_size,
tmp_buff_size,
division_limit, age_threshold));
}
DBUG_RETURN(0);
}
/** @brief
Resize key cache
*/
int ha_resize_key_cache(KEY_CACHE *key_cache)
{
DBUG_ENTER("ha_resize_key_cache");
if (key_cache->key_cache_inited)
{
pthread_mutex_lock(&LOCK_global_system_variables);
long tmp_buff_size= (long) key_cache->param_buff_size;
long tmp_block_size= (long) key_cache->param_block_size;
uint division_limit= key_cache->param_division_limit;
uint age_threshold= key_cache->param_age_threshold;
pthread_mutex_unlock(&LOCK_global_system_variables);
DBUG_RETURN(!resize_key_cache(key_cache, tmp_block_size,
tmp_buff_size,
division_limit, age_threshold));
}
DBUG_RETURN(0);
}
/** @brief
Change parameters for key cache (like size)
*/
int ha_change_key_cache_param(KEY_CACHE *key_cache)
{
if (key_cache->key_cache_inited)
{
pthread_mutex_lock(&LOCK_global_system_variables);
uint division_limit= key_cache->param_division_limit;
uint age_threshold= key_cache->param_age_threshold;
pthread_mutex_unlock(&LOCK_global_system_variables);
change_key_cache_param(key_cache, division_limit, age_threshold);
}
return 0;
}
/** @brief
Free memory allocated by a key cache
*/
int ha_end_key_cache(KEY_CACHE *key_cache)
{
end_key_cache(key_cache, 1); // Can never fail
return 0;
}
/** @brief
Move all tables from one key cache to another one
*/
int ha_change_key_cache(KEY_CACHE *old_key_cache,
KEY_CACHE *new_key_cache)
{
mi_change_key_cache(old_key_cache, new_key_cache);
return 0;
}
/** @brief
Try to discover one table from handler(s)
RETURN
-1 : Table did not exists
0 : OK. In this case *frmblob and *frmlen are set
>0 : error. frmblob and frmlen may not be set
*/
struct st_discover_args
{
const char *db;
const char *name;
uchar **frmblob;
size_t *frmlen;
};
static my_bool discover_handlerton(THD *thd, plugin_ref plugin,
void *arg)
{
st_discover_args *vargs= (st_discover_args *)arg;
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES && hton->discover &&
(!(hton->discover(hton, thd, vargs->db, vargs->name,
vargs->frmblob,
vargs->frmlen))))
return TRUE;
return FALSE;
}
int ha_discover(THD *thd, const char *db, const char *name,
uchar **frmblob, size_t *frmlen)
{
int error= -1; // Table does not exist in any handler
DBUG_ENTER("ha_discover");
DBUG_PRINT("enter", ("db: %s, name: %s", db, name));
st_discover_args args= {db, name, frmblob, frmlen};
if (is_prefix(name,tmp_file_prefix)) /* skip temporary tables */
DBUG_RETURN(error);
if (plugin_foreach(thd, discover_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, &args))
error= 0;
if (!error)
status_var_increment(thd->status_var.ha_discover_count);
DBUG_RETURN(error);
}
/** @brief
Call this function in order to give the handler the possibility
to ask engine if there are any new tables that should be written to disk
or any dropped tables that need to be removed from disk
*/
struct st_find_files_args
{
const char *db;
const char *path;
const char *wild;
bool dir;
List<LEX_STRING> *files;
};
static my_bool find_files_handlerton(THD *thd, plugin_ref plugin,
void *arg)
{
st_find_files_args *vargs= (st_find_files_args *)arg;
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES && hton->find_files)
if (hton->find_files(hton, thd, vargs->db, vargs->path, vargs->wild,
vargs->dir, vargs->files))
return TRUE;
return FALSE;
}
int
ha_find_files(THD *thd,const char *db,const char *path,
const char *wild, bool dir, List<LEX_STRING> *files)
{
int error= 0;
DBUG_ENTER("ha_find_files");
DBUG_PRINT("enter", ("db: '%s' path: '%s' wild: '%s' dir: %d",
db, path, wild ? wild : "NULL", dir));
st_find_files_args args= {db, path, wild, dir, files};
plugin_foreach(thd, find_files_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, &args);
/* The return value is not currently used */
DBUG_RETURN(error);
}
/*
Ask handler if the table exists in engine
RETURN
HA_ERR_NO_SUCH_TABLE Table does not exist
HA_ERR_TABLE_EXIST Table exists
# Error code
*/
struct st_table_exists_in_engine_args
{
const char *db;
const char *name;
int err;
};
static my_bool table_exists_in_engine_handlerton(THD *thd, plugin_ref plugin,
void *arg)
{
st_table_exists_in_engine_args *vargs= (st_table_exists_in_engine_args *)arg;
handlerton *hton= plugin_data(plugin, handlerton *);
int err= HA_ERR_NO_SUCH_TABLE;
if (hton->state == SHOW_OPTION_YES && hton->table_exists_in_engine)
err = hton->table_exists_in_engine(hton, thd, vargs->db, vargs->name);
vargs->err = err;
if (vargs->err == HA_ERR_TABLE_EXIST)
return TRUE;
return FALSE;
}
int ha_table_exists_in_engine(THD* thd, const char* db, const char* name)
{
DBUG_ENTER("ha_table_exists_in_engine");
DBUG_PRINT("enter", ("db: %s, name: %s", db, name));
st_table_exists_in_engine_args args= {db, name, HA_ERR_NO_SUCH_TABLE};
plugin_foreach(thd, table_exists_in_engine_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, &args);
DBUG_PRINT("exit", ("error: %d", args.err));
DBUG_RETURN(args.err);
}
#ifdef HAVE_NDB_BINLOG
/*
TODO: change this into a dynamic struct
List<handlerton> does not work as
1. binlog_end is called when MEM_ROOT is gone
2. cannot work with thd MEM_ROOT as memory should be freed
*/
#define MAX_HTON_LIST_ST 63
struct hton_list_st
{
handlerton *hton[MAX_HTON_LIST_ST];
uint sz;
};
struct binlog_func_st
{
enum_binlog_func fn;
void *arg;
};
/** @brief
Listing handlertons first to avoid recursive calls and deadlock
*/
static my_bool binlog_func_list(THD *thd, plugin_ref plugin, void *arg)
{
hton_list_st *hton_list= (hton_list_st *)arg;
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES && hton->binlog_func)
{
uint sz= hton_list->sz;
if (sz == MAX_HTON_LIST_ST-1)
{
/* list full */
return FALSE;
}
hton_list->hton[sz]= hton;
hton_list->sz= sz+1;
}
return FALSE;
}
static my_bool binlog_func_foreach(THD *thd, binlog_func_st *bfn)
{
hton_list_st hton_list;
uint i, sz;
hton_list.sz= 0;
plugin_foreach(thd, binlog_func_list,
MYSQL_STORAGE_ENGINE_PLUGIN, &hton_list);
for (i= 0, sz= hton_list.sz; i < sz ; i++)
hton_list.hton[i]->binlog_func(hton_list.hton[i], thd, bfn->fn, bfn->arg);
return FALSE;
}
int ha_reset_logs(THD *thd)
{
binlog_func_st bfn= {BFN_RESET_LOGS, 0};
binlog_func_foreach(thd, &bfn);
return 0;
}
void ha_reset_slave(THD* thd)
{
binlog_func_st bfn= {BFN_RESET_SLAVE, 0};
binlog_func_foreach(thd, &bfn);
}
void ha_binlog_wait(THD* thd)
{
binlog_func_st bfn= {BFN_BINLOG_WAIT, 0};
binlog_func_foreach(thd, &bfn);
}
int ha_binlog_end(THD* thd)
{
binlog_func_st bfn= {BFN_BINLOG_END, 0};
binlog_func_foreach(thd, &bfn);
return 0;
}
int ha_binlog_index_purge_file(THD *thd, const char *file)
{
binlog_func_st bfn= {BFN_BINLOG_PURGE_FILE, (void *)file};
binlog_func_foreach(thd, &bfn);
return 0;
}
struct binlog_log_query_st
{
enum_binlog_command binlog_command;
const char *query;
uint query_length;
const char *db;
const char *table_name;
};
static my_bool binlog_log_query_handlerton2(THD *thd,
handlerton *hton,
void *args)
{
struct binlog_log_query_st *b= (struct binlog_log_query_st*)args;
if (hton->state == SHOW_OPTION_YES && hton->binlog_log_query)
hton->binlog_log_query(hton, thd,
b->binlog_command,
b->query,
b->query_length,
b->db,
b->table_name);
return FALSE;
}
static my_bool binlog_log_query_handlerton(THD *thd,
plugin_ref plugin,
void *args)
{
return binlog_log_query_handlerton2(thd, plugin_data(plugin, handlerton *), args);
}
void ha_binlog_log_query(THD *thd, handlerton *hton,
enum_binlog_command binlog_command,
const char *query, uint query_length,
const char *db, const char *table_name)
{
struct binlog_log_query_st b;
b.binlog_command= binlog_command;
b.query= query;
b.query_length= query_length;
b.db= db;
b.table_name= table_name;
if (hton == 0)
plugin_foreach(thd, binlog_log_query_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, &b);
else
binlog_log_query_handlerton2(thd, hton, &b);
}
#endif
/** @brief
Read the first row of a multi-range set.
SYNOPSIS
read_multi_range_first()
found_range_p Returns a pointer to the element in 'ranges' that
corresponds to the returned row.
ranges An array of KEY_MULTI_RANGE range descriptions.
range_count Number of ranges in 'ranges'.
sorted If result should be sorted per key.
buffer A HANDLER_BUFFER for internal handler usage.
NOTES
Record is read into table->record[0].
*found_range_p returns a valid value only if read_multi_range_first()
returns 0.
Sorting is done within each range. If you want an overall sort, enter
'ranges' with sorted ranges.
RETURN
0 OK, found a row
HA_ERR_END_OF_FILE No rows in range
# Error code
*/
int handler::read_multi_range_first(KEY_MULTI_RANGE **found_range_p,
KEY_MULTI_RANGE *ranges, uint range_count,
bool sorted, HANDLER_BUFFER *buffer)
{
int result= HA_ERR_END_OF_FILE;
DBUG_ENTER("handler::read_multi_range_first");
multi_range_sorted= sorted;
multi_range_buffer= buffer;
table->mark_columns_used_by_index_no_reset(active_index, table->read_set);
table->column_bitmaps_set(table->read_set, table->write_set);
for (multi_range_curr= ranges, multi_range_end= ranges + range_count;
multi_range_curr < multi_range_end;
multi_range_curr++)
{
result= read_range_first(multi_range_curr->start_key.keypart_map ?
&multi_range_curr->start_key : 0,
multi_range_curr->end_key.keypart_map ?
&multi_range_curr->end_key : 0,
test(multi_range_curr->range_flag & EQ_RANGE),
multi_range_sorted);
if (result != HA_ERR_END_OF_FILE)
break;
}
*found_range_p= multi_range_curr;
DBUG_PRINT("exit",("result %d", result));
DBUG_RETURN(result);
}
/** @brief
Read the next row of a multi-range set.
SYNOPSIS
read_multi_range_next()
found_range_p Returns a pointer to the element in 'ranges' that
corresponds to the returned row.
NOTES
Record is read into table->record[0].
*found_range_p returns a valid value only if read_multi_range_next()
returns 0.
RETURN
0 OK, found a row
HA_ERR_END_OF_FILE No (more) rows in range
# Error code
*/
int handler::read_multi_range_next(KEY_MULTI_RANGE **found_range_p)
{
int result;
DBUG_ENTER("handler::read_multi_range_next");
/* We should not be called after the last call returned EOF. */
DBUG_ASSERT(multi_range_curr < multi_range_end);
do
{
/* Save a call if there can be only one row in range. */
if (multi_range_curr->range_flag != (UNIQUE_RANGE | EQ_RANGE))
{
result= read_range_next();
/* On success or non-EOF errors jump to the end. */
if (result != HA_ERR_END_OF_FILE)
break;
}
else
{
/*
We need to set this for the last range only, but checking this
condition is more expensive than just setting the result code.
*/
result= HA_ERR_END_OF_FILE;
}
/* Try the next range(s) until one matches a record. */
for (multi_range_curr++;
multi_range_curr < multi_range_end;
multi_range_curr++)
{
result= read_range_first(multi_range_curr->start_key.keypart_map ?
&multi_range_curr->start_key : 0,
multi_range_curr->end_key.keypart_map ?
&multi_range_curr->end_key : 0,
test(multi_range_curr->range_flag & EQ_RANGE),
multi_range_sorted);
if (result != HA_ERR_END_OF_FILE)
break;
}
}
while ((result == HA_ERR_END_OF_FILE) &&
(multi_range_curr < multi_range_end));
*found_range_p= multi_range_curr;
DBUG_PRINT("exit",("handler::read_multi_range_next: result %d", result));
DBUG_RETURN(result);
}
/** @brief
Read first row between two ranges.
Store ranges for future calls to read_range_next
SYNOPSIS
read_range_first()
start_key Start key. Is 0 if no min range
end_key End key. Is 0 if no max range
eq_range_arg Set to 1 if start_key == end_key and the range endpoints
will not change during query execution.
sorted Set to 1 if result should be sorted per key
NOTES
Record is read into table->record[0]
RETURN
0 Found row
HA_ERR_END_OF_FILE No rows in range
# Error code
*/
int handler::read_range_first(const key_range *start_key,
const key_range *end_key,
bool eq_range_arg, bool sorted)
{
int result;
DBUG_ENTER("handler::read_range_first");
eq_range= eq_range_arg;
end_range= 0;
if (end_key)
{
end_range= &save_end_range;
save_end_range= *end_key;
key_compare_result_on_equal= ((end_key->flag == HA_READ_BEFORE_KEY) ? 1 :
(end_key->flag == HA_READ_AFTER_KEY) ? -1 : 0);
}
range_key_part= table->key_info[active_index].key_part;
if (!start_key) // Read first record
result= index_first(table->record[0]);
else
result= index_read_map(table->record[0],
start_key->key,
start_key->keypart_map,
start_key->flag);
if (result)
DBUG_RETURN((result == HA_ERR_KEY_NOT_FOUND)
? HA_ERR_END_OF_FILE
: result);
DBUG_RETURN (compare_key(end_range) <= 0 ? 0 : HA_ERR_END_OF_FILE);
}
/** @brief
Read next row between two ranges.
SYNOPSIS
read_range_next()
NOTES
Record is read into table->record[0]
RETURN
0 Found row
HA_ERR_END_OF_FILE No rows in range
# Error code
*/
int handler::read_range_next()
{
int result;
DBUG_ENTER("handler::read_range_next");
if (eq_range)
{
/* We trust that index_next_same always gives a row in range */
DBUG_RETURN(index_next_same(table->record[0],
end_range->key,
end_range->length));
}
result= index_next(table->record[0]);
if (result)
DBUG_RETURN(result);
DBUG_RETURN(compare_key(end_range) <= 0 ? 0 : HA_ERR_END_OF_FILE);
}
/** @brief
Compare if found key (in row) is over max-value
SYNOPSIS
compare_key
range range to compare to row. May be 0 for no range
NOTES
See key.cc::key_cmp() for details
RETURN
The return value is SIGN(key_in_row - range_key):
0 Key is equal to range or 'range' == 0 (no range)
-1 Key is less than range
1 Key is larger than range
*/
int handler::compare_key(key_range *range)
{
int cmp;
if (!range)
return 0; // No max range
cmp= key_cmp(range_key_part, range->key, range->length);
if (!cmp)
cmp= key_compare_result_on_equal;
return cmp;
}
int handler::index_read_idx_map(uchar * buf, uint index, const uchar * key,
key_part_map keypart_map,
enum ha_rkey_function find_flag)
{
int error, error1;
error= index_init(index, 0);
if (!error)
{
error= index_read_map(buf, key, keypart_map, find_flag);
error1= index_end();
}
return error ? error : error1;
}
/** @brief
Returns a list of all known extensions.
SYNOPSIS
ha_known_exts()
NOTES
No mutexes, worst case race is a minor surplus memory allocation
We have to recreate the extension map if mysqld is restarted (for example
within libmysqld)
RETURN VALUE
pointer pointer to TYPELIB structure
*/
static my_bool exts_handlerton(THD *unused, plugin_ref plugin,
void *arg)
{
List<char> *found_exts= (List<char> *) arg;
handlerton *hton= plugin_data(plugin, handlerton *);
handler *file;
if (hton->state == SHOW_OPTION_YES && hton->create &&
(file= hton->create(hton, (TABLE_SHARE*) 0, current_thd->mem_root)))
{
List_iterator_fast<char> it(*found_exts);
const char **ext, *old_ext;
for (ext= file->bas_ext(); *ext; ext++)
{
while ((old_ext= it++))
{
if (!strcmp(old_ext, *ext))
break;
}
if (!old_ext)
found_exts->push_back((char *) *ext);
it.rewind();
}
delete file;
}
return FALSE;
}
TYPELIB *ha_known_exts(void)
{
if (!known_extensions.type_names || mysys_usage_id != known_extensions_id)
{
List<char> found_exts;
const char **ext, *old_ext;
known_extensions_id= mysys_usage_id;
found_exts.push_back((char*) TRG_EXT);
found_exts.push_back((char*) TRN_EXT);
plugin_foreach(NULL, exts_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, &found_exts);
ext= (const char **) my_once_alloc(sizeof(char *)*
(found_exts.elements+1),
MYF(MY_WME | MY_FAE));
DBUG_ASSERT(ext != 0);
known_extensions.count= found_exts.elements;
known_extensions.type_names= ext;
List_iterator_fast<char> it(found_exts);
while ((old_ext= it++))
*ext++= old_ext;
*ext= 0;
}
return &known_extensions;
}
static bool stat_print(THD *thd, const char *type, uint type_len,
const char *file, uint file_len,
const char *status, uint status_len)
{
Protocol *protocol= thd->protocol;
protocol->prepare_for_resend();
protocol->store(type, type_len, system_charset_info);
protocol->store(file, file_len, system_charset_info);
protocol->store(status, status_len, system_charset_info);
if (protocol->write())
return TRUE;
return FALSE;
}
static my_bool showstat_handlerton(THD *thd, plugin_ref plugin,
void *arg)
{
enum ha_stat_type stat= *(enum ha_stat_type *) arg;
handlerton *hton= plugin_data(plugin, handlerton *);
if (hton->state == SHOW_OPTION_YES && hton->show_status &&
hton->show_status(hton, thd, stat_print, stat))
return TRUE;
return FALSE;
}
bool ha_show_status(THD *thd, handlerton *db_type, enum ha_stat_type stat)
{
List<Item> field_list;
Protocol *protocol= thd->protocol;
bool result;
field_list.push_back(new Item_empty_string("Type",10));
field_list.push_back(new Item_empty_string("Name",FN_REFLEN));
field_list.push_back(new Item_empty_string("Status",10));
if (protocol->send_fields(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
return TRUE;
if (db_type == NULL)
{
result= plugin_foreach(thd, showstat_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, &stat);
}
else
{
if (db_type->state != SHOW_OPTION_YES)
{
const LEX_STRING *name=&hton2plugin[db_type->slot]->name;
result= stat_print(thd, name->str, name->length,
"", 0, "DISABLED", 8) ? 1 : 0;
}
else
result= db_type->show_status &&
db_type->show_status(db_type, thd, stat_print, stat) ? 1 : 0;
}
if (!result)
send_eof(thd);
return result;
}
/*
Function to check if the conditions for row-based binlogging is
correct for the table.
A row in the given table should be replicated if:
- Row-based replication is enabled in the current thread
- The binlog is enabled
- It is not a temporary table
- The binary log is open
- The database the table resides in shall be binlogged (binlog_*_db rules)
- table is not mysql.event
*/
/* The Sun compiler cannot instantiate the template below if this is
declared static, but it works by putting it into an anonymous
namespace. */
namespace {
bool check_table_binlog_row_based(THD *thd, TABLE *table)
{
if (table->s->cached_row_logging_check == -1)
{
int const check(table->s->tmp_table == NO_TMP_TABLE &&
binlog_filter->db_ok(table->s->db.str));
table->s->cached_row_logging_check= check;
}
DBUG_ASSERT(table->s->cached_row_logging_check == 0 ||
table->s->cached_row_logging_check == 1);
return (thd->current_stmt_binlog_row_based &&
table->s->cached_row_logging_check &&
(thd->options & OPTION_BIN_LOG) &&
mysql_bin_log.is_open());
}
}
/** @brief
Write table maps for all (manually or automatically) locked tables
to the binary log.
SYNOPSIS
write_locked_table_maps()
thd Pointer to THD structure
DESCRIPTION
This function will generate and write table maps for all tables
that are locked by the thread 'thd'. Either manually locked
(stored in THD::locked_tables) and automatically locked (stored
in THD::lock) are considered.
RETURN VALUE
0 All OK
1 Failed to write all table maps
SEE ALSO
THD::lock
THD::locked_tables
*/
namespace
{
int write_locked_table_maps(THD *thd)
{
DBUG_ENTER("write_locked_table_maps");
DBUG_PRINT("enter", ("thd: 0x%lx thd->lock: 0x%lx thd->locked_tables: 0x%lx "
"thd->extra_lock: 0x%lx",
(long) thd, (long) thd->lock,
(long) thd->locked_tables, (long) thd->extra_lock));
if (thd->get_binlog_table_maps() == 0)
{
MYSQL_LOCK *locks[3];
locks[0]= thd->extra_lock;
locks[1]= thd->lock;
locks[2]= thd->locked_tables;
for (uint i= 0 ; i < sizeof(locks)/sizeof(*locks) ; ++i )
{
MYSQL_LOCK const *const lock= locks[i];
if (lock == NULL)
continue;
TABLE **const end_ptr= lock->table + lock->table_count;
for (TABLE **table_ptr= lock->table ;
table_ptr != end_ptr ;
++table_ptr)
{
TABLE *const table= *table_ptr;
DBUG_PRINT("info", ("Checking table %s", table->s->table_name.str));
if (table->current_lock == F_WRLCK &&
check_table_binlog_row_based(thd, table))
{
int const has_trans= table->file->has_transactions();
int const error= thd->binlog_write_table_map(table, has_trans);
/*
If an error occurs, it is the responsibility of the caller to
roll back the transaction.
*/
if (unlikely(error))
DBUG_RETURN(1);
}
}
}
}
DBUG_RETURN(0);
}
template<class RowsEventT> int
binlog_log_row(TABLE* table,
const uchar *before_record,
const uchar *after_record)
{
if (table->no_replicate)
return 0;
bool error= 0;
THD *const thd= table->in_use;
if (check_table_binlog_row_based(thd, table))
{
MY_BITMAP cols;
/* Potential buffer on the stack for the bitmap */
uint32 bitbuf[BITMAP_STACKBUF_SIZE/sizeof(uint32)];
uint n_fields= table->s->fields;
my_bool use_bitbuf= n_fields <= sizeof(bitbuf)*8;
/*
If there are no table maps written to the binary log, this is
the first row handled in this statement. In that case, we need
to write table maps for all locked tables to the binary log.
*/
if (likely(!(error= bitmap_init(&cols,
use_bitbuf ? bitbuf : NULL,
(n_fields + 7) & ~7UL,
FALSE))))
{
bitmap_set_all(&cols);
if (likely(!(error= write_locked_table_maps(thd))))
{
error=
RowsEventT::binlog_row_logging_function(thd, table,
table->file->
has_transactions(),
&cols, table->s->fields,
before_record,
after_record);
}
if (!use_bitbuf)
bitmap_free(&cols);
}
}
return error ? HA_ERR_RBR_LOGGING_FAILED : 0;
}
/*
Instantiate the versions we need for the above template function,
because we have -fno-implicit-template as compiling option.
*/
template int
binlog_log_row<Write_rows_log_event>(TABLE *, const uchar *, const uchar *);
template int
binlog_log_row<Delete_rows_log_event>(TABLE *, const uchar *, const uchar *);
template int
binlog_log_row<Update_rows_log_event>(TABLE *, const uchar *, const uchar *);
}
int handler::ha_external_lock(THD *thd, int lock_type)
{
DBUG_ENTER("handler::ha_external_lock");
/*
Whether this is lock or unlock, this should be true, and is to verify that
if get_auto_increment() was called (thus may have reserved intervals or
taken a table lock), ha_release_auto_increment() was too.
*/
DBUG_ASSERT(next_insert_id == 0);
/*
We cache the table flags if the locking succeeded. Otherwise, we
keep them as they were when they were fetched in ha_open().
*/
int error= external_lock(thd, lock_type);
if (error == 0)
cached_table_flags= table_flags();
DBUG_RETURN(error);
}
/** @brief
Check handler usage and reset state of file to after 'open'
*/
int handler::ha_reset()
{
DBUG_ENTER("ha_reset");
/* Check that we have called all proper deallocation functions */
DBUG_ASSERT((uchar*) table->def_read_set.bitmap +
table->s->column_bitmap_size ==
(uchar*) table->def_write_set.bitmap);
DBUG_ASSERT(bitmap_is_set_all(&table->s->all_set));
DBUG_ASSERT(table->key_read == 0);
/* ensure that ha_index_end / ha_rnd_end has been called */
DBUG_ASSERT(inited == NONE);
/* Free cache used by filesort */
free_io_cache(table);
DBUG_RETURN(reset());
}
int handler::ha_write_row(uchar *buf)
{
int error;
if (unlikely(error= write_row(buf)))
return error;
if (unlikely(error= binlog_log_row<Write_rows_log_event>(table, 0, buf)))
return error;
return 0;
}
int handler::ha_update_row(const uchar *old_data, uchar *new_data)
{
int error;
/*
Some storage engines require that the new record is in record[0]
(and the old record is in record[1]).
*/
DBUG_ASSERT(new_data == table->record[0]);
if (unlikely(error= update_row(old_data, new_data)))
return error;
if (unlikely(error= binlog_log_row<Update_rows_log_event>(table, old_data, new_data)))
return error;
return 0;
}
int handler::ha_delete_row(const uchar *buf)
{
int error;
if (unlikely(error= delete_row(buf)))
return error;
if (unlikely(error= binlog_log_row<Delete_rows_log_event>(table, buf, 0)))
return error;
return 0;
}
/** @brief
use_hidden_primary_key() is called in case of an update/delete when
(table_flags() and HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) is defined
but we don't have a primary key
*/
void handler::use_hidden_primary_key()
{
/* fallback to use all columns in the table to identify row */
table->use_all_columns();
}
/** @brief
Dummy function which accept information about log files which is not need
by handlers
*/
void signal_log_not_needed(struct handlerton, char *log_file)
{
DBUG_ENTER("signal_log_not_needed");
DBUG_PRINT("enter", ("logfile '%s'", log_file));
DBUG_VOID_RETURN;
}
#ifdef TRANS_LOG_MGM_EXAMPLE_CODE
/*
Example of transaction log management functions based on assumption that logs
placed into a directory
*/
#include <my_dir.h>
#include <my_sys.h>
int example_of_iterator_using_for_logs_cleanup(handlerton *hton)
{
void *buffer;
int res= 1;
struct handler_iterator iterator;
struct handler_log_file_data data;
if (!hton->create_iterator)
return 1; /* iterator creator is not supported */
if ((*hton->create_iterator)(hton, HA_TRANSACTLOG_ITERATOR, &iterator) !=
HA_ITERATOR_OK)
{
/* error during creation of log iterator or iterator is not supported */
return 1;
}
while((*iterator.next)(&iterator, (void*)&data) == 0)
{
printf("%s\n", data.filename.str);
if (data.status == HA_LOG_STATUS_FREE &&
my_delete(data.filename.str, MYF(MY_WME)))
goto err;
}
res= 0;
err:
(*iterator.destroy)(&iterator);
return res;
}
/*
Here we should get info from handler where it save logs but here is
just example, so we use constant.
IMHO FN_ROOTDIR ("/") is safe enough for example, because nobody has
rights on it except root and it consist of directories only at lest for
*nix (sorry, can't find windows-safe solution here, but it is only example).
*/
#define fl_dir FN_ROOTDIR
/** @brief
Dummy function to return log status should be replaced by function which
really detect the log status and check that the file is a log of this
handler.
*/
enum log_status fl_get_log_status(char *log)
{
MY_STAT stat_buff;
if (my_stat(log, &stat_buff, MYF(0)))
return HA_LOG_STATUS_INUSE;
return HA_LOG_STATUS_NOSUCHLOG;
}
struct fl_buff
{
LEX_STRING *names;
enum log_status *statuses;
uint32 entries;
uint32 current;
};
int fl_log_iterator_next(struct handler_iterator *iterator,
void *iterator_object)
{
struct fl_buff *buff= (struct fl_buff *)iterator->buffer;
struct handler_log_file_data *data=
(struct handler_log_file_data *) iterator_object;
if (buff->current >= buff->entries)
return 1;
data->filename= buff->names[buff->current];
data->status= buff->statuses[buff->current];
buff->current++;
return 0;
}
void fl_log_iterator_destroy(struct handler_iterator *iterator)
{
my_free((uchar*)iterator->buffer, MYF(MY_ALLOW_ZERO_PTR));
}
/** @brief
returns buffer, to be assigned in handler_iterator struct
*/
enum handler_create_iterator_result
fl_log_iterator_buffer_init(struct handler_iterator *iterator)
{
MY_DIR *dirp;
struct fl_buff *buff;
char *name_ptr;
uchar *ptr;
FILEINFO *file;
uint32 i;
/* to be able to make my_free without crash in case of error */
iterator->buffer= 0;
if (!(dirp = my_dir(fl_dir, MYF(0))))
{
return HA_ITERATOR_ERROR;
}
if ((ptr= (uchar*)my_malloc(ALIGN_SIZE(sizeof(fl_buff)) +
((ALIGN_SIZE(sizeof(LEX_STRING)) +
sizeof(enum log_status) +
+ FN_REFLEN) *
(uint) dirp->number_off_files),
MYF(0))) == 0)
{
return HA_ITERATOR_ERROR;
}
buff= (struct fl_buff *)ptr;
buff->entries= buff->current= 0;
ptr= ptr + (ALIGN_SIZE(sizeof(fl_buff)));
buff->names= (LEX_STRING*) (ptr);
ptr= ptr + ((ALIGN_SIZE(sizeof(LEX_STRING)) *
(uint) dirp->number_off_files));
buff->statuses= (enum log_status *)(ptr);
name_ptr= (char *)(ptr + (sizeof(enum log_status) *
(uint) dirp->number_off_files));
for (i=0 ; i < (uint) dirp->number_off_files ; i++)
{
enum log_status st;
file= dirp->dir_entry + i;
if ((file->name[0] == '.' &&
((file->name[1] == '.' && file->name[2] == '\0') ||
file->name[1] == '\0')))
continue;
if ((st= fl_get_log_status(file->name)) == HA_LOG_STATUS_NOSUCHLOG)
continue;
name_ptr= strxnmov(buff->names[buff->entries].str= name_ptr,
FN_REFLEN, fl_dir, file->name, NullS);
buff->names[buff->entries].length= (name_ptr -
buff->names[buff->entries].str) - 1;
buff->statuses[buff->entries]= st;
buff->entries++;
}
iterator->buffer= buff;
iterator->next= &fl_log_iterator_next;
iterator->destroy= &fl_log_iterator_destroy;
return HA_ITERATOR_OK;
}
/* An example of a iterator creator */
enum handler_create_iterator_result
fl_create_iterator(enum handler_iterator_type type,
struct handler_iterator *iterator)
{
switch(type) {
case HA_TRANSACTLOG_ITERATOR:
return fl_log_iterator_buffer_init(iterator);
default:
return HA_ITERATOR_UNSUPPORTED;
}
}
#endif /*TRANS_LOG_MGM_EXAMPLE_CODE*/
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