mi_info.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:4k
- /* 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 */
- /* Return useful base information for an open table */
- #include "myisamdef.h"
- #ifdef __WIN__
- #include <sys/stat.h>
- #endif
- /* Get position to last record */
- my_off_t mi_position(MI_INFO *info)
- {
- return info->lastpos;
- }
- /* Get information about the table */
- /* if flag == 2 one get current info (no sync from database */
- int mi_status(MI_INFO *info, register MI_ISAMINFO *x, uint flag)
- {
- MY_STAT state;
- MYISAM_SHARE *share=info->s;
- DBUG_ENTER("mi_status");
- x->recpos = info->lastpos;
- if (flag == HA_STATUS_POS)
- DBUG_RETURN(0); /* Compatible with ISAM */
- if (!(flag & HA_STATUS_NO_LOCK))
- {
- pthread_mutex_lock(&share->intern_lock);
- VOID(_mi_readinfo(info,F_RDLCK,0));
- fast_mi_writeinfo(info);
- pthread_mutex_unlock(&share->intern_lock);
- }
- if (flag & HA_STATUS_VARIABLE)
- {
- x->records = info->state->records;
- x->deleted = info->state->del;
- x->delete_length = info->state->empty;
- x->data_file_length =info->state->data_file_length;
- x->index_file_length=info->state->key_file_length;
- x->keys = share->state.header.keys;
- x->check_time = share->state.check_time;
- x->mean_reclength = info->state->records ?
- (ulong) ((info->state->data_file_length-info->state->empty)/
- info->state->records) : (ulong) share->min_pack_length;
- }
- if (flag & HA_STATUS_ERRKEY)
- {
- x->errkey = info->errkey;
- x->dupp_key_pos= info->dupp_key_pos;
- }
- if (flag & HA_STATUS_CONST)
- {
- x->reclength = share->base.reclength;
- x->max_data_file_length=share->base.max_data_file_length;
- x->max_index_file_length=info->s->base.max_key_file_length;
- x->filenr = info->dfile;
- x->options = share->options;
- x->create_time=share->state.create_time;
- x->reflength= mi_get_pointer_length(share->base.max_data_file_length,
- myisam_data_pointer_size);
- x->record_offset= ((share->options &
- (HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ?
- 0L : share->base.pack_reclength);
- x->sortkey= -1; /* No clustering */
- x->rec_per_key = share->state.rec_per_key_part;
- x->key_map = share->state.key_map;
- x->data_file_name = share->data_file_name;
- x->index_file_name = share->index_file_name;
- /*
- The following should be included even if we are not compiling with
- USE_RAID as the client must be able to request it!
- */
- x->raid_type= share->base.raid_type;
- x->raid_chunks= share->base.raid_chunks;
- x->raid_chunksize= share->base.raid_chunksize;
- }
- if ((flag & HA_STATUS_TIME) && !my_fstat(info->dfile,&state,MYF(0)))
- x->update_time=state.st_mtime;
- else
- x->update_time=0;
- if (flag & HA_STATUS_AUTO)
- {
- x->auto_increment= share->state.auto_increment+1;
- if (!x->auto_increment) /* This shouldn't happen */
- x->auto_increment= ~(ulonglong) 0;
- }
- DBUG_RETURN(0);
- }