latke 声明方式和编码方式的使用场景

看源码里有 @Transactional 方式，也有编码的方式，想问下使用方式上有什么区别？什么时候用声明式，什么时候用编码的方式

命令式事务

public String userGenInvitecode(final String userId, final String userName) {
        final Transaction transaction = invitecodeRepository.beginTransaction();

        try {
            final String ret = RandomStringUtils.randomAlphanumeric(16);
            final JSONObject invitecode = new JSONObject();
            invitecode.put(Invitecode.CODE, ret);
            invitecode.put(Invitecode.MEMO, "User [" + userName + "," + userId + "] generated");
            invitecode.put(Invitecode.STATUS, Invitecode.STATUS_C_UNUSED);
            invitecode.put(Invitecode.GENERATOR_ID, userId);
            invitecode.put(Invitecode.USER_ID, "");
            invitecode.put(Invitecode.USE_TIME, 0);

            invitecodeRepository.add(invitecode);

            transaction.commit();

            return ret;
        } catch (final RepositoryException e) {
            if (transaction.isActive()) {
                transaction.rollback();
            }

            LOGGER.log(Level.ERROR, "Generates invitecode failed", e);

            return null;
        }
    }
​

声明式事务

@Transactional
    public void addReportHandledNotification(final JSONObject requestJSONObject) throws ServiceException {
        try {
            requestJSONObject.put(Notification.NOTIFICATION_DATA_TYPE, Notification.DATA_TYPE_C_POINT_REPORT_HANDLED);

            addNotification(requestJSONObject);
        } catch (final RepositoryException e) {
            final String msg = "Adds a notification [type=report_handled] failed";
            LOGGER.log(Level.ERROR, msg, e);

            throw new ServiceException(msg);
        }
    }
​