func (l *Lob) SetWriter(wr io.Writer) *Lob {
	l.wr = wr
	return l
}
func (l *Lob) SetWriter(wr io.Writer) *Lob {
	l.wr = wr
	return l
}
// SetWriter sets the io.Writer destination for a lob field to be read from database
// and return *Lob, to enable simple call chaining.