springAPI对事物支持之注解式配置

一、无Spring核心配置文件：applicationContext.xml下开启注解式事物

@Configuration
@EnableTransactionManagement
public class Configuration {}

二、有Spring核心配置文件：applicationContext.xml下开启注解式事物

<tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

三、在业务层使用@Transactional注解

@Service("accountService")
@Transactional(readOnly=true,propagation=Propagation.SUPPORTS)
public class AccountServiceImpl implements IAccountService {
@Autowired
private IAccountDao accountDao;
@Override
public Account findAccountById(Integer id) {
return accountDao.findAccountById(id);
}
@Override
@Transactional(readOnly=false,propagation=Propagation.REQUIRED)
public void transfer(String sourceName, String targeName, Float money) {
//1.根据名称查询两个账户
Account source = accountDao.findAccountByName(sourceName);
Account target = accountDao.findAccountByName(targeName);
//2.修改两个账户的金额
source.setMoney(source.getMoney()-money);//转出账户减钱
target.setMoney(target.getMoney()+money);//转入账户加钱
//3.更新两个账户
accountDao.updateAccount(source);
//int i=1/0;
accountDao.updateAccount(target);