code: func (uuid *UUID) Scan(src interface{}) error {
  	switch src := src.(type) {
  	case nil:
  		return nil
  
  	case string:
  		// if an empty UUID comes from a table, we return a null UUID
  		if src == "" {
  			return nil
  		}
  
  		// see Parse for required string format
  		u, err := Parse(src)
  		if err != nil {
  			return fmt.Errorf("Scan: %v", err)
  		}
  
  		*uuid = u
  
  	case []byte:
  		// if an empty UUID comes from a table, we return a null UUID
  		if len(src) == 0 {
  			return nil
  		}
  
  		// assumes a simple slice of bytes if 16 bytes
  		// otherwise attempts to parse
  		if len(src) != 16 {
  			return uuid.Scan(string(src))
  		}
  		copy((*uuid)[:], src)
  
  	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.