int mi_rnext_same(MI_INFO *info, uchar *buf)
{
  int error;
  uint inx,not_used[2];
  MI_KEYDEF *keyinfo;
  DBUG_ENTER("mi_rnext_same");

  if ((int) (inx=info->lastinx) < 0 || info->lastpos == HA_OFFSET_ERROR)
  {
    set_my_errno(HA_ERR_WRONG_INDEX);
    DBUG_RETURN(HA_ERR_WRONG_INDEX);
  }
  keyinfo=info->s->keyinfo+inx;
  if (fast_mi_readinfo(info))
    DBUG_RETURN(my_errno());

  if (info->s->concurrent_insert)
    mysql_rwlock_rdlock(&info->s->key_root_lock[inx]);

  switch (keyinfo->key_alg)
  {
    case HA_KEY_ALG_RTREE:
      if ((error=rtree_find_next(info,inx,
				 myisam_read_vec[info->last_key_func])))
      {
	error=1;
	set_my_errno(HA_ERR_END_OF_FILE);
	info->lastpos= HA_OFFSET_ERROR;
	break;
      }
      break;
    case HA_KEY_ALG_BTREE:
    default:

      if (info->set_rnext_same_key)
      {
        /* First rnext_same and lastkey is filled in mi_rkey */
        memcpy(info->rnext_same_key, info->lastkey, info->last_rkey_length);
        info->set_rnext_same_key= FALSE;
      }
      for (;;)
      {
        if ((error=_mi_search_next(info,keyinfo,info->lastkey,
			       info->lastkey_length,SEARCH_BIGGER,
			       info->s->state.key_root[inx])))
          break;
        if (ha_key_cmp(keyinfo->seg, info->lastkey, info->rnext_same_key,
                       info->last_rkey_length, SEARCH_FIND, not_used))
        {
          error=1;
          set_my_errno(HA_ERR_END_OF_FILE);
          info->lastpos= HA_OFFSET_ERROR;
          break;
        }
        /* Skip rows that are inserted by other threads since we got a lock */
        if (info->lastpos < info->state->data_file_length && 
            (!info->index_cond_func || mi_check_index_cond(info, inx, buf)))
          break;
      }
  }
  if (info->s->concurrent_insert)
    mysql_rwlock_unlock(&info->s->key_root_lock[inx]);
	/* Don't clear if database-changed */
  info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
  info->update|= HA_STATE_NEXT_FOUND;

  if (error)
  {
    if (my_errno() == HA_ERR_KEY_NOT_FOUND)
      set_my_errno(HA_ERR_END_OF_FILE);
  }
  else if (!buf)
  {
    DBUG_RETURN(info->lastpos==HA_OFFSET_ERROR ? my_errno() : 0);
  }
  else if (!(*info->read_record)(info,info->lastpos,buf))
  {
    info->update|= HA_STATE_AKTIV;		/* Record is read */
    DBUG_RETURN(0);
  }
  DBUG_RETURN(my_errno());
} /* mi_rnext_same */
示例#2
0
int mi_rnext_same(MI_INFO *info, byte *buf)
{
  int error;
  uint inx,not_used[2];
  MI_KEYDEF *keyinfo;
  DBUG_ENTER("mi_rnext_same");

  if ((int) (inx=info->lastinx) < 0 || info->lastpos == HA_OFFSET_ERROR)
    DBUG_RETURN(my_errno=HA_ERR_WRONG_INDEX);
  keyinfo=info->s->keyinfo+inx;
  if (fast_mi_readinfo(info))
    DBUG_RETURN(my_errno);

  if (info->s->concurrent_insert)
    rw_rdlock(&info->s->key_root_lock[inx]);

  switch (keyinfo->key_alg)
  {
#ifdef HAVE_RTREE_KEYS
    case HA_KEY_ALG_RTREE:
      if ((error=rtree_find_next(info,inx,
				 myisam_read_vec[info->last_key_func])))
      {
	error=1;
	my_errno=HA_ERR_END_OF_FILE;
	info->lastpos= HA_OFFSET_ERROR;
	break;
      }
      break;
#endif
    case HA_KEY_ALG_BTREE:
    default:
      if (!(info->update & HA_STATE_RNEXT_SAME))
      {
        /* First rnext_same; Store old key */
        memcpy(info->lastkey2,info->lastkey,info->last_rkey_length);
      }
      for (;;)
      {
        if ((error=_mi_search_next(info,keyinfo,info->lastkey,
			       info->lastkey_length,SEARCH_BIGGER,
			       info->s->state.key_root[inx])))
          break;
        if (ha_key_cmp(keyinfo->seg, info->lastkey, info->lastkey2,
                       info->last_rkey_length, SEARCH_FIND, not_used))
        {
          error=1;
          my_errno=HA_ERR_END_OF_FILE;
          info->lastpos= HA_OFFSET_ERROR;
          break;
        }
        /* Skip rows that are inserted by other threads since we got a lock */
        if (info->lastpos < info->state->data_file_length)
          break;
      }
  }
  if (info->s->concurrent_insert)
    rw_unlock(&info->s->key_root_lock[inx]);
	/* Don't clear if database-changed */
  info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
  info->update|= HA_STATE_NEXT_FOUND | HA_STATE_RNEXT_SAME;

  if (error)
  {
    if (my_errno == HA_ERR_KEY_NOT_FOUND)
      my_errno=HA_ERR_END_OF_FILE;
  }
  else if (!buf)
  {
    DBUG_RETURN(info->lastpos==HA_OFFSET_ERROR ? my_errno : 0);
  }
  else if (!(*info->read_record)(info,info->lastpos,buf))
  {
    info->update|= HA_STATE_AKTIV;		/* Record is read */
    DBUG_RETURN(0);
  }
  DBUG_RETURN(my_errno);
} /* mi_rnext_same */