声明式事务

• 在 类或方法 上直接注解 @Transactional
  遇到 RuntimeException 异常会自动回滚, 其他异常不会回滚
  手动 catch 住的异常也不会回滚

    @Transactional
    public PmUserEntity create(PmUserEntity user) throws Exception {
        user.setId(UUID.randomUUID().toString());
        user.setCreateTime(LocalDateTime.now());
        user.setUpdateTime(Timestamp.valueOf(LocalDateTime.now()));

        PmUserEntity save = pmUserRepository.save(user);

        if (save != null)
            throw new RuntimeException();

        return save;
    }

SpringBoot 快速开启事务（附常见坑点）
Spring声明式事务为何不回滚

编程式事务

   //注入事务管理器
    private final TransactionTemplate transactionTemplate;

    @Autowired
    public UserServiceImpl(PlatformTransactionManager transactionManager) {
        Assert.notNull(transactionManager, "The 'transactionManager' argument must not be null.");
        this.transactionTemplate = new TransactionTemplate(transactionManager);
    }

//包裹需要开启事务的代码块 transactionTemplate.execute(new TransactionCallback<PmUserEntity>() {
//            public PmUserEntity doInTransaction(TransactionStatus status) {
//status.setRollbackOnly 用于回滚
public PmUserEntity createByTransactional(PmUserEntity user) throws Exception {
        PmUserEntity execute = transactionTemplate.execute(new TransactionCallback<PmUserEntity>() {
            public PmUserEntity doInTransaction(TransactionStatus status) {
                user.setId(UUID.randomUUID().toString());
                user.setCreateTime(LocalDateTime.now());
                user.setUpdateTime(Timestamp.valueOf(LocalDateTime.now()));

                PmUserEntity save = pmUserRepository.save(user);

//                status.setRollbackOnly();
                return save;
            }
        });
        return execute;
    }

Spring框架事务管理之四：Spring编程式事务
Transaction Management