code: func (tx *Tx) Queryx(query string, args ...interface{}) (*Rows, error) {
  	r, err := tx.Tx.Query(query, args...)
  	if err != nil {
  		return nil, err
  	}
  	return &Rows{Rows: r, unsafe: tx.unsafe, Mapper: tx.Mapper}, err
  }
docs: // Queryx within a transaction.
  // Any placeholder parameters are replaced with supplied args.