休眠保存、休眠回滚

发布于 2024-12-11 21:55:02 字数 450 浏览 0 评论 0原文

我试图让我的 DAO 以这种方式工作：

    public void incrementNumber(long id) throws Exception{
        Session session = factory.openSession();
        Number n = (Number)session.load(Number.class, id);
        n.setNumber(n.getNumber() +5);
//      throw new IllegalArgumentException("BLAH");
        session.close();
    }

通过注释掉异常，更新将提交。
通过取消注释（？）异常，它将回滚。

有什么办法可以实现这个目标吗？注意：事务部分是在服务中的事务注释下完成的。

原文

I'm trying to make my DAO work this way:

    public void incrementNumber(long id) throws Exception{
        Session session = factory.openSession();
        Number n = (Number)session.load(Number.class, id);
        n.setNumber(n.getNumber() +5);
//      throw new IllegalArgumentException("BLAH");
        session.close();
    }

By commenting out the exception, the update will commit.
By un-commenting(?) the exception, it will rollback.

Any way to achieve this? Note: the transaction part is done in a service, under a transactional annotation.

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柳若烟 2024-12-18 21:55:02

DAO主要负责持久化操作。它应该只提供CRUD和一些与特定实体相关的finder方法。

IMO，您的方法更像是业务操作而不是持久性操作。由于您有服务层，我建议您将此方法移至其中。

因此，您的 NumberDAO 可能如下所示：

public class NumberDAO {

     public Number loadById(long id){ }

}

而您的 NumberService 可能如下所示：

public class NumberService{

        //Inject by DI containers , or setter / constructor
        NumberDAO numberDAO;

         public void incrementNumber(long id , int increaseAmount) throws Exception{

                Number n = (Number) numberDAO.loadById(id);

                if (XXXXXXXX) 
                    throws new IllegalArgumentException("BLAH BLAH BLAH BLAH");

                n.setNumber(n.getNumber() +increaseAmount);
         }

}

当您在服务层使用事务性注释时，如果您的服务方法成功返回，它将自动提交。如果在方法返回之前抛出任何异常，则事务会自动回滚。

DAO is mainly responsible for persistence operations .It should only provide CRUD and some finder methods relating to a particular entity.

IMO , your method more like a business operation rather than the persistence operations . As you have the service layer , I suggest you move this method to it.

So , your NumberDAO may look like this:

public class NumberDAO {

     public Number loadById(long id){ }

}

And you NumberService may look like this:

public class NumberService{

        //Inject by DI containers , or setter / constructor
        NumberDAO numberDAO;

         public void incrementNumber(long id , int increaseAmount) throws Exception{

                Number n = (Number) numberDAO.loadById(id);

                if (XXXXXXXX) 
                    throws new IllegalArgumentException("BLAH BLAH BLAH BLAH");

                n.setNumber(n.getNumber() +increaseAmount);
         }

}

As you use transactional annotation in the service layer , it will commit automatically if your service method returns successfully .In case of any exceptions throw before the method returns , the transaction will rollback automatically .

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