Review

昨日我們講解了Spring如何設定Declarative transaction management並透過例子來了解有transaction management能達到的效果。

今日我們將介紹@Transactional當中能設定的屬性，讓我們更了解Declarative transaciton management

@Transactional

Spring的transaction management在遇到Checked Exception、Unchecked Exception時有不同的行為，

• Unchecked Exception：發生異常default會rollback
• Checked Exception：發生異常default不會rollback

demo Checked Exception不會rollback

@Service
public class AccountService {
    @Autowired
    private AccountDao accountDao;
    @Transactional
    public void transferMoney(String from, String to , Integer amount) throws FileNotFoundException {
        accountDao.addMoney(to,amount);
        accountDao.minusMoney(from,amount);
        FileInputStream  fs = new FileInputStream("C://not_exist.txt");
        System.out.println("轉帳完成："+from+" to "+to+" 金額："+amount);
    }
}

@Test
public void testDay27() throws FileNotFoundException {
    ApplicationContext ioc = new ClassPathXmlApplicationContext("bean27.xml");
    AccountService service = ioc.getBean(AccountService.class);
    service.transferMoney("1","2",100);
}

Result

noRollbackFor / noRollbackForClassName

可設定Unckecked Exception為不rollback

 @Transactional(noRollbackFor = {ArithmeticException.class})
public void transferMoney(String from, String to , Integer amount) throws FileNotFoundException {
    //略
}

@Transactional(noRollbackForClassName = {"java.lang.ArithmeticException"}){
    //略
}

Result

rollbackFor / rollbackForClassName

可設定Ckecked Exception為rollback

 @Transactional(rollbackForClass = {"java.io.FileNotFoundException"})
 public void transferMoney(String from, String to , Integer amount) throws FileNotFoundException {
    //略
}

 @Transactional(rollbackForClassName = {"java.io.FileNotFoundException"})
 public void transferMoney(String from, String to , Integer amount) throws FileNotFoundException {
    //略
}

Result