diff options
Diffstat (limited to 'storage/myisam/mi_update.c')
| -rw-r--r-- | storage/myisam/mi_update.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/storage/myisam/mi_update.c b/storage/myisam/mi_update.c new file mode 100644 index 00000000..68d76790 --- /dev/null +++ b/storage/myisam/mi_update.c @@ -0,0 +1,241 @@ +/* + Copyright (c) 2000, 2011, 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 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +/* Update an old row in a MyISAM table */ + +#include "fulltext.h" +#include "rt_index.h" + +int mi_update(register MI_INFO *info, const uchar *oldrec, + const uchar *newrec) +{ + int flag,key_changed,save_errno; + reg3 my_off_t pos; + uint i; + uchar old_key[HA_MAX_KEY_BUFF],*new_key; + my_bool auto_key_changed=0; + ulonglong changed; + MYISAM_SHARE *share=info->s; + ha_checksum UNINIT_VAR(old_checksum); + DBUG_ENTER("mi_update"); + + DBUG_EXECUTE_IF("myisam_pretend_crashed_table_on_usage", + mi_print_error(info->s, HA_ERR_CRASHED); + DBUG_RETURN(my_errno= HA_ERR_CRASHED);); + 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 (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 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, 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); + + /* The above changed info->lastkey2. Inform mi_rnext_same(). */ + info->update&= ~HA_STATE_RNEXT_SAME; + + 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=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) + set_if_bigger(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); + 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 || + 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; + } + DBUG_RETURN(my_errno=save_errno); +} /* mi_update */ |