func (l *Lob) SetReader(rd io.Reader) *Lob {
	l.rd = rd
	return l
}
func (l *Lob) SetReader(rd io.Reader) *Lob {
	l.rd = rd
	return l
}
// SetReader sets the io.Reader source for a lob field to be written to database
// and return *Lob, to enable simple call chaining.