code: func (uuid *UUID) Scan(src interface{}) error {
  	switch src.(type) {
  	case string:
  		// if an empty UUID comes from a table, we return a null UUID
  		if src.(string) == "" {
  			return nil
  		}
  
  		// see uuid.Parse for required string format
  		parsed := Parse(src.(string))
  
  		if parsed == nil {
  			return errors.New("Scan: invalid UUID format")
  		}
  
  		*uuid = parsed
  	case []byte:
  		b := src.([]byte)
  
  		// if an empty UUID comes from a table, we return a null UUID
  		if len(b) == 0 {
  			return nil
  		}
  
  		// assumes a simple slice of bytes if 16 bytes
  		// otherwise attempts to parse
  		if len(b) == 16 {
  			parsed := make([]byte, 16)
  			copy(parsed, b)
  			*uuid = UUID(parsed)
  		} else {
  			u := Parse(string(b))
  
  			if u == nil {
  				return errors.New("Scan: invalid UUID format")
  			}
  
  			*uuid = u
  		}
  
  	default:
  		return fmt.Errorf("Scan: unable to scan type %T into UUID", src)
  	}
  
  	return nil
  }
docs: // Scan implements sql.Scanner so UUIDs can be read from databases transparently
  // Currently, database types that map to string and []byte are supported. Please
  // consult database-specific driver documentation for matching types.