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/*
Copyright (c) 2000, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/* Update an old row in a MyISAM table */
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_macros.h"
#include "storage/myisam/fulltext.h"
#include "storage/myisam/myisamdef.h"
#include "storage/myisam/rt_index.h"
int mi_update(MI_INFO *info, const uchar *oldrec, uchar *newrec) {
int flag, key_changed, save_errno;
my_off_t pos;
uint i;
uchar old_key[MI_MAX_KEY_BUFF], *new_key;
bool auto_key_changed = false;
ulonglong changed;
MYISAM_SHARE *share = info->s;
ha_checksum old_checksum = 0;
DBUG_TRACE;
DBUG_EXECUTE_IF("myisam_pretend_crashed_table_on_usage",
mi_print_error(info->s, HA_ERR_CRASHED);
set_my_errno(HA_ERR_CRASHED); return HA_ERR_CRASHED;);
if (!(info->update & HA_STATE_AKTIV)) {
set_my_errno(HA_ERR_KEY_NOT_FOUND);
return HA_ERR_KEY_NOT_FOUND;
}
if (share->options & HA_OPTION_READ_ONLY_DATA) {
set_my_errno(EACCES);
return EACCES;
}
if (info->state->key_file_length >= share->base.margin_key_file_length) {
set_my_errno(HA_ERR_INDEX_FILE_FULL);
return HA_ERR_INDEX_FILE_FULL;
}
pos = info->lastpos;
if (_mi_readinfo(info, F_WRLCK, 1)) return my_errno();
if (share->calc_checksum)
old_checksum = info->checksum = (*share->calc_checksum)(info, oldrec);
if ((*share->compare_record)(info, oldrec)) {
save_errno = my_errno();
goto err_end; /* Record has changed */
}
/* Calculate and check all unique constraints */
key_changed = 0;
for (i = 0; i < share->state.header.uniques; i++) {
MI_UNIQUEDEF *def = share->uniqueinfo + i;
if (mi_unique_comp(def, newrec, oldrec, true) &&
mi_check_unique(info, def, newrec, mi_unique_hash(def, newrec),
info->lastpos)) {
save_errno = my_errno();
goto err_end;
}
}
if (_mi_mark_file_changed(info)) {
save_errno = my_errno();
goto err_end;
}
/* Check which keys changed from the original row */
new_key = info->lastkey2;
changed = 0;
for (i = 0; i < share->base.keys; i++) {
if (mi_is_key_active(share->state.key_map, i)) {
if (share->keyinfo[i].flag & HA_FULLTEXT) {
if (_mi_ft_cmp(info, i, oldrec, newrec)) {
if ((int)i == info->lastinx) {
/*
We are changing the index we are reading on. Mark that
the index data has changed and we need to do a full search
when doing read-next
*/
key_changed |= HA_STATE_WRITTEN;
}
changed |= ((ulonglong)1 << i);
if (_mi_ft_update(info, i, old_key, oldrec, newrec, pos)) goto err;
}
} else {
uint new_length = _mi_make_key(info, i, new_key, newrec, pos);
uint old_length = _mi_make_key(info, i, old_key, oldrec, pos);
if (new_length != old_length ||
memcmp((uchar *)old_key, (uchar *)new_key, new_length)) {
if ((int)i == info->lastinx)
key_changed |= HA_STATE_WRITTEN; /* Mark that keyfile changed */
changed |= ((ulonglong)1 << i);
share->keyinfo[i].version++;
if (share->keyinfo[i].ck_delete(info, i, old_key, old_length))
goto err;
if (share->keyinfo[i].ck_insert(info, i, new_key, new_length))
goto err;
if (share->base.auto_key == i + 1) auto_key_changed = true;
}
}
}
}
/*
If we are running with external locking, we must update the index file
that something has changed.
*/
if (changed || !my_disable_locking) key_changed |= HA_STATE_CHANGED;
if (share->calc_checksum) {
info->checksum = (*share->calc_checksum)(info, newrec);
/* Store new checksum in index file header */
key_changed |= HA_STATE_CHANGED;
}
{
/*
Don't update index file if data file is not extended and no status
information changed
*/
MI_STATUS_INFO state;
ha_rows org_split;
my_off_t org_delete_link;
memcpy((char *)&state, (char *)info->state, sizeof(state));
org_split = share->state.split;
org_delete_link = share->state.dellink;
if ((*share->update_record)(info, pos, newrec)) goto err;
if (!key_changed &&
(memcmp((char *)&state, (char *)info->state, sizeof(state)) ||
org_split != share->state.split ||
org_delete_link != share->state.dellink))
key_changed |= HA_STATE_CHANGED; /* Must update index file */
}
if (auto_key_changed)
info->s->state.auto_increment = std::max(
info->s->state.auto_increment, retrieve_auto_increment(info, newrec));
if (share->calc_checksum)
info->state->checksum += (info->checksum - old_checksum);
info->update =
(HA_STATE_CHANGED | HA_STATE_ROW_CHANGED | HA_STATE_AKTIV | key_changed);
myisam_log_record(MI_LOG_UPDATE, info, newrec, info->lastpos, 0);
/*
Every myisam function that updates myisam table must end with
call to _mi_writeinfo(). If operation (second param of
_mi_writeinfo()) is not 0 it sets share->changed to 1, that is
flags that data has changed. If operation is 0, this function
equals to no-op in this case.
mi_update() must always pass !0 value as operation, since even if
there is no index change there could be data change.
*/
(void)_mi_writeinfo(info, WRITEINFO_UPDATE_KEYFILE);
return 0;
err:
DBUG_PRINT("error", ("key: %d errno: %d", i, my_errno()));
save_errno = my_errno();
if (changed) key_changed |= HA_STATE_CHANGED;
if (my_errno() == HA_ERR_FOUND_DUPP_KEY ||
my_errno() == HA_ERR_RECORD_FILE_FULL ||
my_errno() == HA_ERR_NULL_IN_SPATIAL || my_errno() == HA_ERR_OUT_OF_MEM) {
info->errkey = (int)i;
flag = 0;
do {
if (((ulonglong)1 << i) & changed) {
if (share->keyinfo[i].flag & HA_FULLTEXT) {
if ((flag++ && _mi_ft_del(info, i, new_key, newrec, pos)) ||
_mi_ft_add(info, i, old_key, oldrec, pos))
break;
} else {
uint new_length = _mi_make_key(info, i, new_key, newrec, pos);
uint old_length = _mi_make_key(info, i, old_key, oldrec, pos);
if ((flag++ &&
share->keyinfo[i].ck_delete(info, i, new_key, new_length)) ||
share->keyinfo[i].ck_insert(info, i, old_key, old_length))
break;
}
}
} while (i-- != 0);
} else {
mi_print_error(info->s, HA_ERR_CRASHED);
mi_mark_crashed(info);
}
info->update =
(HA_STATE_CHANGED | HA_STATE_AKTIV | HA_STATE_ROW_CHANGED | key_changed);
err_end:
myisam_log_record(MI_LOG_UPDATE, info, newrec, info->lastpos, my_errno());
(void)_mi_writeinfo(info, WRITEINFO_UPDATE_KEYFILE);
if (save_errno == HA_ERR_KEY_NOT_FOUND) {
mi_print_error(info->s, HA_ERR_CRASHED);
save_errno = HA_ERR_CRASHED;
}
set_my_errno(save_errno);
return save_errno;
} /* mi_update */
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