Question

在我的webapp中，使用了Spring事务和Hibernate会话API。请参阅下面的我的服务和DAO课程和用法;

BizCustomerService

@Service
@Transactional(propagation = Propagation.REQUIRED)
public class BizCustomerService {

    @Autowired
    CustomerService customerService;

    public void createCustomer(Customer cus) {
        //some business logic codes here

        customerService.createCustomer(cus);

        //***the problem is here, changing the state of 'cus' object
        //it is necessary code according to business logic
        if (<some-check-meet>)
            cus.setWebAccount(new WebAccount("something", "something"));
    }
}

的CustomerService

@Service
@Transactional(propagation = Propagation.REQUIRED)
@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS)
public class CustomerService {

    @Autowired
    CustomerDAO customerDao;

    public Long createCustomer(Customer cus) {
        //some code goes here
        customerDao.save();
    }
}

CustomerDAO

@Repository
public class CustomerDAO {

    @Autowired
    private SessionFactory sessionFactory;

    private Session getSession() {
        return sessionFactory.getCurrentSession();
    }

    public Long save(Customer customer) {
        //* the old code
        //return (Long) getSession().save(customer);

        //[START] new code to change
        Long id = (Long) getSession().save(customer);

        //1. here using 'customer' object need to do other DB insert/update table functions
        //2. if those operation are failed or success, as usual, they are under a transaction boundary
       //3. lets say example private method
       doSomeInsertUpdate(customer);
       //[END] new code to change

        return id;
    }

    //do other insert/update operations 
    private void doSomeInsertUpdate(customer) {

         //when check webAccount, it is NULL
         if (customer.getWebAccount() != null) {
              //to do something
         }

    }
}

客户

@Entity
@Table(name = "CUSTOMER")
public class Customer {
     //other relationships and fields

     @OneToOne(fetch = FetchType.LAZY, mappedBy = "customer")
     @Cascade({CascadeType.ALL})
     public WebAccount getWebAccount() {
          return this.webAccount;
     }
}

在上面的代码中，客户是在BizCustomerService中创建的，然后可能会在通过DAO保留后更改相关WebAccount的状态。提交事务时，新的Customer和相关的WebAccount对象将持久保存到DB。我知道这是正常的。

问题是;在CustomerDAO#save() >> doSomeInsertUpdate()方法中，'webAccount'为NULL，此时尚未设置该值。

编辑：还有一点，它是受限制的，不想更改BizCustomerService和CustomerService的代码，因为可以对DAO方法进行多次调用它可以影响很多。所以想只在DAO级别进行更改。

所以我的问题是如何在doSomeInsertUpdate（）方法中访问WebAccount对象？是否需要任何Hibernate使用？

提前致谢!!

Answer 1

不确定你期待什么，但我认为这里没有魔力。如果您希望WebAccount为!= null，则必须明确地创建一个并将其保存到数据库中。

WebAccount wb = new WebAccount();
getSession().save(wb);
customer.setWebAccount(wb);

春天＆amp; Hibernate - 获取持久化对象状态的变化

1 个答案: