插入与子对象的Hibernate不返回完整的对象 [英] Insert with Hibernate with child objects does not return full object

问题描述

我使用的是Spring 3.2和hibernate-core 4.1.4以及hibernate-jpa-2.0.1。应用程序资源文件包含所有正确的对象。

我有一个子对象RoleEntity，它有两个父母：User和Award，所以userId和awardId是外键 - 已存在的键，并且必须存在用于创建角色实体。

  public class RoleEntity implements Serializable 
 {
 @Id 
 @GeneratedValue（strategy = GenerationType.AUTO）
 @Column（name =role_id）
 private long roleId; 
 
 @Column（name =role_description）
 private String roleDescription; 
 
 @Column（name =role_name）
 private String roleName; 
 $ b @ManyToOne（fetch = FetchType.EAGER）
 @JoinColumn（name =user_id）$ b $ private UserEntity user; 
 $ b @ManyToOne（fetch = FetchType.EAGER）
 @JoinColumn（name =award_id）
私人AwardEntity奖; 
 $ b ... getters / setters 
 ... hash / equals / toString 
} 
  

我的DAO插入看起来很简单：



$ public RoleEntity saveRoleEntity （RoleEntity角色）
{
logger.debug（saveRoleEntity：role =+ role）;
返回角色;
}

我有单元测试了这个代码，我可以确认当我选择现有的roleId，我可以完全获取加载的对象，用户和奖完全填充。

但是，当我插入新角色时，我执行以下操作：

1. 将roleId设置为0，以及角色描述...
   
2. 创建一个userEntity并仅设置id ，这个ID已经存在，不是新的
   
3. 创建一个奖励实体，并设置唯一的ID，这个ID已经存在，不是新的
   

我可以成功保存，这真是太棒了！为我工作。
并且在新的对象返回中，我可以清楚地看到新的角色返回给我！
所有其他领域RoleEntity，如描述，那里是。

但是，我还想要的是RoleEntity的用户和奖励字段完全填充好像我插入后做了选择。这是可能的吗？

我宁愿不做一个选择的用户和奖表获得这些对象，然后将其分配给这个对象，但如果我有那就好了。

如果我需要提供更多信息，请告诉我。
感谢您的任何帮助。

解决方案

尝试这种方法：



sess.save（role）;

sess.flush（）; //强制执行SQL INSERT

sess.refresh（role）;


I am using Spring 3.2 and hibernate-core 4.1.4 and hibernate-jpa-2.0.1. The application resource file has all the correct objects.

I have a child object RoleEntity, and it has two parents: User and Award, so the userId and the awardId are foreign-keys that already exist, and MUST exist for the role entity to be created.

public class RoleEntity implements Serializable
{
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "role_id")
    private long roleId;

    @Column(name = "role_description")
    private String roleDescription;

    @Column(name = "role_name")
    private String roleName;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "user_id")
    private UserEntity user;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "award_id")
    private AwardEntity award;

     ... getters/setters
     ... hash/equals/toString
}

My DAO insert looks very simple:

@Override
public RoleEntity saveRoleEntity(RoleEntity role)
{
     logger.debug("saveRoleEntity: role=" + role);
     return role;
}

I have unit tested this code, and I can confirm that when I select an existing roleId, I can fully get back the loaded object, with User and Award fully populated.

However, when I insert new role, I do the following:

1. set roleId to 0, and the role description ...
2. create a userEntity and set the id only, this id already exists and is not new
3. create a awardEntity and set the id only, this id already exists and is not new

I can successfully do a save and this is great!!!! Works for me. And in the new object return, I can clearly see the new roleId is returned to me!!! All the other fields to RoleEntity, like the description, that is there.

But, what I ALSO want is for the User and Award fields of the RoleEntity to be fully populated as if I had done a select after the insert. Is this even possible?

I would prefer to not do a select to the user and award tables to get those objects and then assign them to this object, but if I have to do that, then that's fine.

If I need to provide any more information, please let me know. Thanks for any help in advance.

解决方案

Try this approach:

sess.save(role);
sess.flush(); //force the SQL INSERT
sess.refresh(role);

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