-/* 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 */

-

-/* L{ser p} basen av en isam_nyckel */

-

-#include "isamdef.h"

-

-

- /* Read a record using key */

- /* Ordinary search_flag is 0 ; Give error if no record with key */

-

-int nisam_rkey(N_INFO *info, byte *buf, int inx, const byte *key, uint key_len, enum ha_rkey_function search_flag)

-{

- uchar *key_buff;

- ISAM_SHARE *share=info->s;

- DBUG_ENTER("nisam_rkey");

- DBUG_PRINT("enter",("base: %lx inx: %d search_flag: %d",

- info,inx,search_flag));

-

- if ((inx = _nisam_check_index(info,inx)) < 0)

- DBUG_RETURN(-1);

- info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);

- if (key_len >= (share->keyinfo[inx].base.keylength - share->rec_reflength)

- && !(info->s->keyinfo[inx].base.flag & HA_SPACE_PACK_USED))

- key_len=USE_HOLE_KEY;

- key_buff=info->lastkey+info->s->base.max_key_length;

- key_len=_nisam_pack_key(info,(uint) inx,key_buff,(uchar*) key,key_len);

- DBUG_EXECUTE("key",_nisam_print_key(DBUG_FILE,share->keyinfo[inx].seg,

- (uchar*) key););

-

-#ifndef NO_LOCKING

- if (_nisam_readinfo(info,F_RDLCK,1))

- goto err;

-#endif

-

- VOID(_nisam_search(info,info->s->keyinfo+inx,key_buff,key_len,

- nisam_read_vec[search_flag],info->s->state.key_root[inx]));

- if ((*info->read_record)(info,info->lastpos,buf) >= 0)

- {

- info->update|= HA_STATE_AKTIV; /* Record is read */

- DBUG_RETURN(0);

- }

-

- info->lastpos = NI_POS_ERROR; /* Didn't find key */

- VOID(_nisam_move_key(info->s->keyinfo+inx,info->lastkey,key_buff));

- if (search_flag == HA_READ_AFTER_KEY)

- info->update|=HA_STATE_NEXT_FOUND; /* Previous gives last row */

-err:

- DBUG_RETURN(-1);

-} /* nisam_rkey */