在Hibernate中的一个事务中添加父子数据

Question

我正在编写一个示例java控制台应用程序，它在hibernate中写入数据。所有hibernate配置都已完成。以下是项目的类结构：

public class DBUser implements Serializable {

private static final long serialVersionUID = 1L;

  private int userId;
  private String username;
  private String createdBy;
  private Date createdDate;
  private DBUserDetail userDetail;

  //Getters, Setters and constructors

}

public class DBUserDetail implements Serializable{

  private static final long serialVersionUID = 1L;

  private Integer userId;
  private DBUser user;
  private String compName;
  private String compDesc;
  private String remark;
  private Date listedDate;


   //Getters, Setters and constructors
}

如您所见，一个DBUser只能有一个DBUserDetail，而一个DBUserDetail只能有一个DBUser。假设在一个超文本传输协议请求中，用户同时输入新的DBUser和DBUserDetail数据。所以我想在一个交易中添加这两个信息。下面是我的解决方案：

public void addComplexTypes()
{

    try 
    {

        System.out.println("Hibernate one to one (XML mapping)");

        Session session = HibernateUtil.getSessionFactory().openSession();
        Transaction transaction = null;

        transaction = session.beginTransaction();       

        DBUser user = new DBUser();
        user.setUsername("username49"); user.setCreatedBy("createdBy49");

        DBUserDetail userDetail = new DBUserDetail();
        userDetail.setCompName("GENTING Malaysia");
        userDetail.setCompDesc("Best resort in the world");
        userDetail.setRemark("Nothing Special");
        userDetail.setListedDate(new Date());

        user.setUserDetail(userDetail);
        userDetail.setUser(user);

        session.save(user);
        transaction.commit();

        System.out.println("Done");

    } catch (HibernateException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


}

我得到一个错误：

原因：java。sql。SQLIntegrityConstraintViolationException:ORA-02291:违反完整性约束（TAHA_SOZGEN.FK_DBUSERDETAIL）-未找到父密钥

我推断，我必须提前添加DBUser。当第一次搜索DBUser并将其附加到DBUserDetail时，该代码起作用。我更改代码，首先添加DBUser，然后添加DBUserDetail。因此，我将代码修改如下：

public void addComplexTypes()
{

    try 
    {

        System.out.println("Hibernate one to one (XML mapping)");

        Session session = HibernateUtil.getSessionFactory().openSession();
        Transaction transaction = null;

        transaction = session.beginTransaction();       

        DBUser user = this.addDbUser("username49", "createdBy49", session, transaction);
    //  user.setUsername("username49"); user.setCreatedBy("createdBy49");

        if(user == null || user.getUserId() <0)
            throw new RuntimeException(" this.addDbUser unsuccessfull");            

        DBUserDetail userDetail = new DBUserDetail();
        userDetail.setCompName("GENTING Malaysia");
        userDetail.setCompDesc("Best resort in the world");
        userDetail.setRemark("Nothing Special");
        userDetail.setListedDate(new Date());

        user.setUserDetail(userDetail);
        userDetail.setUser(user);

        session.save(user);
        transaction.commit();

        System.out.println("Done");

    } catch (HibernateException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


}

    public DBUser addDbUser(String userName, String createdBy,Session session ,Transaction transaction)
{

    try 
    {

        DBUser user = new DBUser();
        int anahtar = Integer.MIN_VALUE;

        user.setUsername(userName);
        user.setCreatedBy(createdBy);
        user.setCreatedDate(new Date());

        anahtar = (Integer)session.save(user);          
        user.setUserId(anahtar);            
        user.setUserId(anahtar);

        return user;

    } catch (HibernateException hata) {
        transaction.rollback();
        // TODO Auto-generated catch block
        hata.printStackTrace();
    }

    return null;

}

我得到了同样的错误：

原因：java。sql。SQLIntegrityConstraintViolationException:ORA-02291:违反完整性约束（TAHA_SOZGEN.FK_DBUSERDETAIL）-未找到父密钥

我怎样才能克服这个问题？

Answer 1

西尔弗芳的回答是正确的。我使用了基于xml的映射，并且如feanor07所述插入了“cascade save update”，但它并没有解决问题。当我使用Silverfang所说的“@OneToOne（mappedBy=“namehere”，cascade=CascadeType.PERSIST）”时，它是有效的。