Exemplo n.º 1
0
int myrg_rlast(MYRG_INFO *info, uchar *buf, int inx)
{
  MYRG_TABLE *table;
  MI_INFO *mi;
  int err;

  if (_myrg_init_queue(info,inx, HA_READ_KEY_OR_PREV))
    return my_errno;

  for (table=info->open_tables ; table < info->end_table ; table++)
  {
    if ((err=mi_rlast(table->table,NULL,inx)))
    {
      if (err == HA_ERR_END_OF_FILE)
	continue;
      return err;
    }
    /* adding to queue */
    queue_insert(&(info->by_key),(uchar *)table);
  }
  /* We have done a read in all tables */
  info->last_used_table=table;

  if (!info->by_key.elements)
    return HA_ERR_END_OF_FILE;

  mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
  return _myrg_mi_read_record(mi,buf);
}
Exemplo n.º 2
0
int myrg_rkey(MYRG_INFO *info,uchar *buf,int inx, const uchar *key,
            key_part_map keypart_map, enum ha_rkey_function search_flag)
{
  uchar *key_buff;
  uint pack_key_length;
  uint16 last_used_keyseg;
  MYRG_TABLE *table;
  MI_INFO *mi;
  int err;
  DBUG_ENTER("myrg_rkey");
  LINT_INIT(key_buff);
  LINT_INIT(pack_key_length);
  LINT_INIT(last_used_keyseg);

  if (_myrg_init_queue(info,inx,search_flag))
    DBUG_RETURN(my_errno);

  for (table=info->open_tables ; table != info->end_table ; table++)
  {
    mi=table->table;

    if (table == info->open_tables)
    {
      err=mi_rkey(mi, 0, inx, key, keypart_map, search_flag);
      /* Get the saved packed key and packed key length. */
      key_buff=(uchar*) mi->lastkey+mi->s->base.max_key_length;
      pack_key_length=mi->pack_key_length;
      last_used_keyseg= mi->last_used_keyseg;
    }
    else
    {
      mi->once_flags|= USE_PACKED_KEYS;
      mi->last_used_keyseg= last_used_keyseg;
      err=mi_rkey(mi, 0, inx, key_buff, pack_key_length, search_flag);
    }
    info->last_used_table=table+1;

    if (err)
    {
      if (err == HA_ERR_KEY_NOT_FOUND)
	continue;
      DBUG_PRINT("exit", ("err: %d", err));
      DBUG_RETURN(err);
    }
    /* adding to queue */
    queue_insert(&(info->by_key),(uchar *)table);

  }

  DBUG_PRINT("info", ("tables with matches: %u", info->by_key.elements));
  if (!info->by_key.elements)
    DBUG_RETURN(HA_ERR_KEY_NOT_FOUND);

  mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
  mi->once_flags|= RRND_PRESERVE_LASTINX;
  DBUG_PRINT("info", ("using table no: %d",
                      (int) (info->current_table - info->open_tables + 1)));
  DBUG_DUMP("result key", (uchar*) mi->lastkey, mi->lastkey_length);
  DBUG_RETURN(_myrg_mi_read_record(mi,buf));
}