type EnumType string
const (
	EnumTypeSuccess EnumType = "success"
	EnumTypeFailure EnumType = "success"
)
func (e *EnumType) Scan(src interface{}) error {
	switch s := src.(type) {
	case []byte:
		*e = EnumType(s)
	case string:
		*e = EnumType(s)
	default:
		return fmt.Errorf("unsupported scan type for EnumType: %T", src)
	}
	return nil
}

type EnumType string
const (
	EnumTypeSuccess EnumType = "success"
	EnumTypeFailure EnumType = "success"
)
// convenience function for returning all possible values
func(e *EnumType) Values() []EnumType {
 return []EnumType{
 EnumTypeSuccess
 EnumTypeFailure
 }
}
func (e *EnumType) Scan(src interface{}) error {
	switch s := src.(type) {
	case []byte:
		*e = EnumType(s)
	case string:
		*e = EnumType(s)
		switch s {
		case "success"
			*e = EnumTypeSuccess
			// etc
		default:
			return fmt.Errorf("string %s is not a member of enum EnumType", s)
		}
	default:
		return fmt.Errorf("unsupported scan type for EnumType: %T", src)
	}
	return nil
}