default.go
func (u MAC) Value() (driver.Value, error) {
	return driver.Value(string(u)), nil
}
func (u MAC) Value() (driver.Value, error) {
	return driver.Value(string(u)), nil
}
func ( u MAC ) Value ( ) ( driver . Value , error ) { return driver . Value ( string ( u ) ) , nil }
// Value converts a value to a database driver value
Value converts a value to a database driver value