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5886090182
myisammrg/ |
Makefile.am |
mymrgdef.h | support for keys
myrg_open.c | &
myrg_queue.c | bugfixes
myrg_rfirst.c |
myrg_rkey.c |
myrg_rlast.c |
myrg_rnext.c |
myrg_rprev.c |
myrg_rrnd.c |
include/myisammrg.h | rkey/rnext/etc prototyped
sql/ |
ha_myisammrg.cc | support for keys
ha_myisammrg.h |
myisam/ |
mi_rkey.c | buf==NULL extension, _mi_rkey()
mi_rnext.c |
mi_rprev.c |
include/queues.h | reinit_queue() - same as init_queue, but w/o malloc
mysys/queues.c |
PART II: Miscellaneous
myisam/common_words | deleted (looks like I checked it in by mistake)
some files (like acconfig.h, Makefile.am, COPYING.LIB, etc)
| Change mode to -rw-r--r-- (by `chmod a-x ')
111 lines
3.6 KiB
C
111 lines
3.6 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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/* Read record based on a key */
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#include "myisamdef.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 _mi_rkey(MI_INFO *info, byte *buf, int inx, const byte *key, uint key_len,
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enum ha_rkey_function search_flag, bool raw_key)
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{
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uchar *key_buff;
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MYISAM_SHARE *share=info->s;
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uint pack_key_length;
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DBUG_ENTER("_mi_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 = _mi_check_index(info,inx)) < 0)
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DBUG_RETURN(my_errno);
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info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
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if (raw_key)
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{
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if (key_len == 0)
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key_len=USE_WHOLE_KEY;
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key_buff=info->lastkey+info->s->base.max_key_length;
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pack_key_length=_mi_pack_key(info,(uint) inx,key_buff,(uchar*) key,key_len);
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info->last_rkey_length=pack_key_length;
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DBUG_EXECUTE("key",_mi_print_key(DBUG_FILE,share->keyinfo[inx].seg,
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key_buff,pack_key_length););
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}
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else
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{
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/* key is already packed! */
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key_buff=info->lastkey+info->s->base.max_key_length;
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info->last_rkey_length=pack_key_length=key_len;
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bmove(key_buff,key,key_len);
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}
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if (_mi_readinfo(info,F_RDLCK,1))
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goto err;
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if (share->concurrent_insert)
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rw_rdlock(&share->key_root_lock[inx]);
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if (!_mi_search(info,info->s->keyinfo+inx,key_buff,pack_key_length,
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myisam_read_vec[search_flag],info->s->state.key_root[inx]))
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{
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while (info->lastpos >= info->state->data_file_length)
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{
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/*
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Skip rows that are inserted by other threads since we got a lock
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Note that this can only happen if we are not searching after an
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exact key, because the keys are sorted according to position
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*/
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if (_mi_search_next(info,info->s->keyinfo+inx,info->lastkey,
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info->lastkey_length,
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myisam_readnext_vec[search_flag],
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info->s->state.key_root[inx]))
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break;
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}
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}
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if (share->concurrent_insert)
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rw_unlock(&share->key_root_lock[inx]);
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if (!buf)
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DBUG_RETURN(info->lastpos==HA_OFFSET_ERROR ? my_errno : 0);
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if (!(*info->read_record)(info,info->lastpos,buf))
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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 = HA_OFFSET_ERROR; /* Didn't find key */
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/* Store key for read next */
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memcpy(info->lastkey,key_buff,pack_key_length);
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bzero((char*) info->lastkey+pack_key_length,info->s->base.rec_reflength);
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info->lastkey_length=pack_key_length+info->s->base.rec_reflength;
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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(my_errno);
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} /* _mi_rkey */
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/* shouldn't forget to do it inline sometime */
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int mi_rkey(MI_INFO *info, byte *buf, int inx, const byte *key, uint key_len,
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enum ha_rkey_function search_flag)
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{
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return _mi_rkey(info,buf,inx,key,key_len,search_flag,TRUE);
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}
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