diff options
Diffstat (limited to 'isam/update.c')
| -rw-r--r-- | isam/update.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/isam/update.c b/isam/update.c new file mode 100644 index 00000000000..ffcea740986 --- /dev/null +++ b/isam/update.c @@ -0,0 +1,119 @@ +/* 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"); + + 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) + { + my_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,my_errno); + VOID(_nisam_writeinfo(info,1)); + allow_break(); /* Allow SIGHUP & SIGINT */ + if (save_errno == HA_ERR_KEY_NOT_FOUND) + my_errno=HA_ERR_CRASHED; + else + my_errno=save_errno; + DBUG_RETURN(-1); +} /* nisam_update */ |