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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Uppdaterare nuvarande record i en pisam-databas */
#include "isamdef.h"
#ifdef __WIN__
#include <errno.h>
#endif
/* Updaterar senaste l{sta record i databasen */
int nisam_update(register N_INFO *info, const byte *oldrec, const byte *newrec)
{
int flag,key_changed,save_errno;
reg3 ulong pos;
uint i,length;
uchar old_key[N_MAX_KEY_BUFF],*new_key;
DBUG_ENTER("nisam_update");
LINT_INIT(save_errno);
if (!(info->update & HA_STATE_AKTIV))
{
my_errno=HA_ERR_KEY_NOT_FOUND;
DBUG_RETURN(-1);
}
if (info->s->base.options & HA_OPTION_READ_ONLY_DATA)
{
my_errno=EACCES;
DBUG_RETURN(-1);
}
pos=info->lastpos;
#ifndef NO_LOCKING
if (_nisam_readinfo(info,F_WRLCK,1)) DBUG_RETURN(-1);
#endif
if ((*info->s->compare_record)(info,oldrec))
{
save_errno=my_errno;
goto err_end; /* Record has changed */
}
if (info->s->state.key_file_length >=
info->s->base.max_key_file_length -
info->s->blocksize* INDEX_BLOCK_MARGIN *info->s->state.keys)
{
save_errno=HA_ERR_INDEX_FILE_FULL;
goto err_end;
}
/* Flyttar de element i isamfilen som m}ste flyttas */
new_key=info->lastkey+info->s->base.max_key_length;
key_changed=HA_STATE_KEY_CHANGED; /* We changed current database */
/* Remove key that didn't change */
for (i=0 ; i < info->s->state.keys ; i++)
{
length=_nisam_make_key(info,i,new_key,newrec,pos);
if (length != _nisam_make_key(info,i,old_key,oldrec,pos) ||
memcmp((byte*) old_key,(byte*) new_key,length))
{
if ((int) i == info->lastinx)
key_changed|=HA_STATE_WRITTEN; /* Mark that keyfile changed */
if (_nisam_ck_delete(info,i,old_key)) goto err;
if (_nisam_ck_write(info,i,new_key)) goto err;
}
}
if ((*info->s->update_record)(info,pos,newrec))
goto err;
info->update= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED | HA_STATE_AKTIV |
key_changed);
nisam_log_record(LOG_UPDATE,info,newrec,info->lastpos,0);
VOID(_nisam_writeinfo(info,test(key_changed)));
allow_break(); /* Allow SIGHUP & SIGINT */
DBUG_RETURN(0);
err:
DBUG_PRINT("error",("key: %d errno: %d",i,my_errno));
save_errno=my_errno;
if (my_errno == HA_ERR_FOUND_DUPP_KEY || my_errno == HA_ERR_RECORD_FILE_FULL)
{
info->errkey= (int) i;
flag=0;
do
{
length=_nisam_make_key(info,i,new_key,newrec,pos);
if (length != _nisam_make_key(info,i,old_key,oldrec,pos) ||
memcmp((byte*) old_key,(byte*) new_key,length))
{
if ((flag++ && _nisam_ck_delete(info,i,new_key)) ||
_nisam_ck_write(info,i,old_key))
break;
}
} while (i-- != 0);
}
info->update= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED | HA_STATE_AKTIV |
key_changed);
err_end:
nisam_log_record(LOG_UPDATE,info,newrec,info->lastpos,save_errno);
VOID(_nisam_writeinfo(info,1));
allow_break(); /* Allow SIGHUP & SIGINT */
my_errno=(save_errno == HA_ERR_KEY_NOT_FOUND) ? HA_ERR_CRASHED : save_errno;
DBUG_RETURN(-1);
} /* nisam_update */
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