mi_update.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:6k
- /* 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 */
- /* Update an old row in a MyISAM table */
- #include "fulltext.h"
- #include "rt_index.h"
- int mi_update(register MI_INFO *info, const byte *oldrec, byte *newrec)
- {
- int flag,key_changed,save_errno;
- reg3 my_off_t pos;
- uint i;
- uchar old_key[MI_MAX_KEY_BUFF],*new_key;
- bool auto_key_changed=0;
- ulonglong changed;
- MYISAM_SHARE *share=info->s;
- ha_checksum old_checksum;
- DBUG_ENTER("mi_update");
- LINT_INIT(new_key);
- LINT_INIT(changed);
- LINT_INIT(old_checksum);
- if (!(info->update & HA_STATE_AKTIV))
- {
- DBUG_RETURN(my_errno=HA_ERR_KEY_NOT_FOUND);
- }
- if (share->options & HA_OPTION_READ_ONLY_DATA)
- {
- DBUG_RETURN(my_errno=EACCES);
- }
- if (info->state->key_file_length >= share->base.margin_key_file_length)
- {
- DBUG_RETURN(my_errno=HA_ERR_INDEX_FILE_FULL);
- }
- pos=info->lastpos;
- if (_mi_readinfo(info,F_WRLCK,1))
- DBUG_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,1) &&
- 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 (((ulonglong) 1 << i) & share->state.key_map)
- {
- if (share->keyinfo[i].flag & HA_FULLTEXT )
- {
- if (_mi_ft_cmp(info,i,oldrec, newrec))
- {
- if ((int) i == info->lastinx)
- {
- /*
- We are changeing 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,(char*) 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((byte*) old_key,(byte*) 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=1;
- }
- }
- }
- }
- /*
- 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)
- update_auto_increment(info,newrec);
- if (share->calc_checksum)
- share->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);
- VOID(_mi_writeinfo(info,key_changed ? WRITEINFO_UPDATE_KEYFILE : 0));
- allow_break(); /* Allow SIGHUP & SIGINT */
- if (info->invalidator != 0)
- {
- DBUG_PRINT("info", ("invalidator... '%s' (update)", info->filename));
- (*info->invalidator)(info->filename);
- info->invalidator=0;
- }
- DBUG_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)
- {
- 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,(char*) new_key,newrec,pos)) ||
- _mi_ft_add(info,i,(char*) 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++ && _mi_ck_delete(info,i,new_key,new_length)) ||
- _mi_ck_write(info,i,old_key,old_length))
- break;
- }
- }
- } while (i-- != 0);
- }
- else
- 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));
- allow_break(); /* Allow SIGHUP & SIGINT */
- if (save_errno == HA_ERR_KEY_NOT_FOUND)
- save_errno=HA_ERR_CRASHED;
- DBUG_RETURN(my_errno=save_errno);
- } /* mi_update */