一、手动回滚事务
有时我们需要捕获一些错误信息,又需要进行事务回滚,这时我们就需要用到Spring提供的事务切面支持类TransactionAspectSupport。
@Transactional(rollbackFor = Exception.class) @Override public void saveEntity() throws Exception{ try { userDao.saveUser(); studentDao.saveStudent(); }catch (Exception e){ System.out.println("异常了=====" + e); //手动强制回滚事务,这里一定要第一时间处理 TransactionAspectSupport.currentTransactionStatus().setRollbackOnly(); } }
手动回滚事务一定要加上@Transactional,不然会报以下错误:
org.springframework.transaction.NoTransactionException: No transaction aspect-managed TransactionStatus in scope
想想也是,不开启事务,何来手动回滚,所以@Transactional必不可少。
二、回滚部分异常
使用Object savePoint = TransactionAspectSupport.currentTransactionStatus().createSavepoint(); 设置回滚点。
使用TransactionAspectSupport.currentTransactionStatus().rollbackToSavepoint(savePoint); 回滚到savePoint。
@Transactional(rollbackFor = Exception.class) @Override public void saveEntity() throws Exception{ Object savePoint = null; try { userDao.saveUser(); //设置回滚点 savePoint = TransactionAspectSupport.currentTransactionStatus().createSavepoint(); studentDao.saveStudent(); //执行成功 int a = 10/0; //这里因为除数0会报异常,进入catch块 }catch (Exception e){ System.out.println("异常了=====" + e); //手工回滚异常 TransactionAspectSupport.currentTransactionStatus().rollbackToSavepoint(savePoint); } }
三、DataSourceTransactionManager
spring 开启事务以及手动提交事务,可以在服务类上加上两个注解。
@Autowired
DataSourceTransactionManager dataSourceTransactionManager;
@Autowired
TransactionDefinition transactionDefinition;
手动开启事务
TransactionStatus transactionStatus = dataSourceTransactionManager.getTransaction(transactionDefinition);
手动提交事务
dataSourceTransactionManager.commit(transactionStatus);//提交
手动回滚事务
dataSourceTransactionManager.rollback(transactionStatus);//最好是放在catch 里面,防止程序异常而事务一直卡在哪里未提交