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https://github.com/MariaDB/server.git
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63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* L{ser p} basen av en isam_nyckel */
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#include "isamdef.h"
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/* Read a record using key */
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/* Ordinary search_flag is 0 ; Give error if no record with key */
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int nisam_rkey(N_INFO *info, byte *buf, int inx, const byte *key, uint key_len, enum ha_rkey_function search_flag)
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{
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uchar *key_buff;
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ISAM_SHARE *share=info->s;
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DBUG_ENTER("nisam_rkey");
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DBUG_PRINT("enter",("base: %lx inx: %d search_flag: %d",
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info,inx,search_flag));
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if ((inx = _nisam_check_index(info,inx)) < 0)
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DBUG_RETURN(-1);
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info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
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if (key_len >= (share->keyinfo[inx].base.keylength - share->rec_reflength)
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&& !(info->s->keyinfo[inx].base.flag & HA_SPACE_PACK_USED))
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key_len=USE_HOLE_KEY;
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key_buff=info->lastkey+info->s->base.max_key_length;
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key_len=_nisam_pack_key(info,(uint) inx,key_buff,(uchar*) key,key_len);
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DBUG_EXECUTE("key",_nisam_print_key(DBUG_FILE,share->keyinfo[inx].seg,
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(uchar*) key););
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#ifndef NO_LOCKING
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if (_nisam_readinfo(info,F_RDLCK,1))
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goto err;
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#endif
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VOID(_nisam_search(info,info->s->keyinfo+inx,key_buff,key_len,
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nisam_read_vec[search_flag],info->s->state.key_root[inx]));
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if ((*info->read_record)(info,info->lastpos,buf) >= 0)
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{
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info->update|= HA_STATE_AKTIV; /* Record is read */
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DBUG_RETURN(0);
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}
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info->lastpos = NI_POS_ERROR; /* Didn't find key */
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VOID(_nisam_move_key(info->s->keyinfo+inx,info->lastkey,key_buff));
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if (search_flag == HA_READ_AFTER_KEY)
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info->update|=HA_STATE_NEXT_FOUND; /* Previous gives last row */
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err:
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DBUG_RETURN(-1);
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} /* nisam_rkey */
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