@Bean
    public NutDao nutz(DataSource dataSource) {
        return new NutDao (dataSource);;
    }

    public void testService() {
        Trans.exec(() -> {
            dao.insert("test_table", Chain.make("id", 3));
            throw new RuntimeException("test exception");
        });
    }

public class SpringNutDao extends NutDao {
    public SpringNutDao(DataSource dataSource) {
        super(dataSource);
    }

    @Override
    public void run(ConnCallback callback) {
        Connection con = DataSourceUtils.getConnection(getDataSource());
        try {
            callback.invoke(con);
        } catch (Exception e) {
            if (e instanceof RuntimeException) {
                throw (RuntimeException) e;
            } else {
                throw new RuntimeException(e);
            }
        } finally {
            DataSourceUtils.releaseConnection(con, getDataSource());
        }
    }
}

    @Bean
    public NutDao nutz(DataSource dataSource) {
        return new SpringNutDao(dataSource);
    }

    @Bean
    public DataSourceTransactionManager  transactionManager(DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Transactional
    public void testService() {
        dao.insert("test_table", Chain.make("id", 3));
        throw new RuntimeException("test exception");
    }

    @Autowired
    private PlatformTransactionManager transactionManager;

    public void testService() {
        DefaultTransactionDefinition def = new DefaultTransactionDefinition();
        TransactionStatus transactionStatus = transactionManager.getTransaction(def);
        try{
            dao.insert("test_table", Chain.make("id", 3));
            throw new RuntimeException("test exception");
        }catch (Exception e){
            if (transactionStatus.isCompleted()) {
                System.out.println("事務(wù)已完成，無(wú)需回滾");
            }else {
                transactionManager.rollback(transactionStatus);
            }
        }

    }