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/* Update an old row in a MyISAM table */
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#include "myisamdef.h"
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#include <drizzled/util/test.h>
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int mi_update(register MI_INFO *info, const unsigned char *oldrec, unsigned char *newrec)
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int mi_update(register MI_INFO *info, const uchar *oldrec, uchar *newrec)
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int flag,key_changed,save_errno;
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register my_off_t pos;
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unsigned char old_key[MI_MAX_KEY_BUFF],*new_key;
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bool auto_key_changed=0;
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uchar old_key[MI_MAX_KEY_BUFF],*new_key;
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my_bool auto_key_changed=0;
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MYISAM_SHARE *share= info->s;
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ha_checksum old_checksum= 0;
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DBUG_ENTER("mi_update");
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DBUG_EXECUTE_IF("myisam_pretend_crashed_table_on_usage",
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mi_print_error(info->s, HA_ERR_CRASHED);
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DBUG_RETURN(my_errno= HA_ERR_CRASHED););
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if (!(info->update & HA_STATE_AKTIV))
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return(my_errno=HA_ERR_KEY_NOT_FOUND);
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DBUG_RETURN(my_errno=HA_ERR_KEY_NOT_FOUND);
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if (share->options & HA_OPTION_READ_ONLY_DATA)
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return(my_errno=EACCES);
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DBUG_RETURN(my_errno=EACCES);
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if (info->state->key_file_length >= share->base.margin_key_file_length)
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return(my_errno=HA_ERR_INDEX_FILE_FULL);
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DBUG_RETURN(my_errno=HA_ERR_INDEX_FILE_FULL);
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if (_mi_readinfo(info,F_WRLCK,1))
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DBUG_RETURN(my_errno);
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if (share->calc_checksum)
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old_checksum=info->checksum=(*share->calc_checksum)(info,oldrec);
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if (mi_is_key_active(share->state.key_map, i))
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uint32_t new_length=_mi_make_key(info,i,new_key,newrec,pos);
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uint32_t old_length=_mi_make_key(info,i,old_key,oldrec,pos);
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uint new_length=_mi_make_key(info,i,new_key,newrec,pos);
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uint old_length=_mi_make_key(info,i,old_key,oldrec,pos);
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/* The above changed info->lastkey2. Inform mi_rnext_same(). */
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info->update&= ~HA_STATE_RNEXT_SAME;
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if (new_length != old_length ||
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memcmp(old_key,new_key,new_length))
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memcmp((uchar*) old_key,(uchar*) new_key,new_length))
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if ((int) i == info->lastinx)
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key_changed|=HA_STATE_WRITTEN; /* Mark that keyfile changed */
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changed|=((uint64_t) 1 << i);
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changed|=((ulonglong) 1 << i);
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share->keyinfo[i].version++;
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if (share->keyinfo[i].ck_delete(info,i,old_key,old_length)) goto err;
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if (share->keyinfo[i].ck_insert(info,i,new_key,new_length)) goto err;
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If we are running with external locking, we must update the index file
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that something has changed.
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if (changed || !my_disable_locking)
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key_changed|= HA_STATE_CHANGED;
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if (share->calc_checksum)
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ha_rows org_split;
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my_off_t org_delete_link;
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memcpy(&state, info->state, sizeof(state));
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memcpy((char*) &state, (char*) info->state, sizeof(state));
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org_split= share->state.split;
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org_delete_link= share->state.dellink;
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if ((*share->update_record)(info,pos,newrec))
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if (!key_changed &&
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(memcmp(&state, info->state, sizeof(state)) ||
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(memcmp((char*) &state, (char*) info->state, sizeof(state)) ||
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org_split != share->state.split ||
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org_delete_link != share->state.dellink))
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key_changed|= HA_STATE_CHANGED; /* Must update index file */
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info->update= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED | HA_STATE_AKTIV |
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myisam_log_record(MI_LOG_UPDATE,info,newrec,info->lastpos,0);
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Every myisam function that updates myisam table must end with
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call to _mi_writeinfo(). If operation (second param of
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mi_update() must always pass !0 value as operation, since even if
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there is no index change there could be data change.
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_mi_writeinfo(info, WRITEINFO_UPDATE_KEYFILE);
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VOID(_mi_writeinfo(info, WRITEINFO_UPDATE_KEYFILE));
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if (info->invalidator != 0)
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DBUG_PRINT("info", ("invalidator... '%s' (update)", info->filename));
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(*info->invalidator)(info->filename);
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info->invalidator=0;
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DBUG_PRINT("error",("key: %d errno: %d",i,my_errno));
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save_errno=my_errno;
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key_changed|= HA_STATE_CHANGED;
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if (((uint64_t) 1 << i) & changed)
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if (((ulonglong) 1 << i) & changed)
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uint32_t new_length=_mi_make_key(info,i,new_key,newrec,pos);
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uint32_t old_length= _mi_make_key(info,i,old_key,oldrec,pos);
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uint new_length=_mi_make_key(info,i,new_key,newrec,pos);
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uint old_length= _mi_make_key(info,i,old_key,oldrec,pos);
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if ((flag++ && _mi_ck_delete(info,i,new_key,new_length)) ||
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_mi_ck_write(info,i,old_key,old_length))
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_mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE);
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myisam_log_record(MI_LOG_UPDATE,info,newrec,info->lastpos,my_errno);
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VOID(_mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE));
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if (save_errno == HA_ERR_KEY_NOT_FOUND)
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mi_print_error(info->s, HA_ERR_CRASHED);
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save_errno=HA_ERR_CRASHED;
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return(my_errno=save_errno);
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DBUG_RETURN(my_errno=save_errno);
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} /* mi_update */