Question

我决定使用hibernate将hbm.xml样式更改为注释。我在我的hbm.xml中：

<hibernate-mapping package="by.sokol.jpr.data">
 <class name="Licence">
  <id name="licenceId">
   <generator class="native" />
  </id>
 <many-to-one name="user" lazy="false" cascade="save-update" column="usr"/>
 </class>
</hibernate-mapping>

并将其更改为：

@Entity
public class Licence {

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 private int licenceId;

 @ManyToOne(targetEntity=User.class, fetch=FetchType.EAGER, cascade = CascadeType.ALL)
 @Cascade(value = { org.hibernate.annotations.CascadeType.SAVE_UPDATE })
 private User user;
}

用户类：

@Entity(name = "Usr")
public class User {

    // BEGIN user info
    @Basic
    private String uid;
    @Basic
    private String name;
    @Basic
    private String company;
    @Basic
    private String street;

    // user's zip code
    @Basic
    private String ubication;
    @Basic
    private String city;
    @Basic
    private String po;

    @Column(name = "useremail")
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY, generator = "assignedGen")
    @GenericGenerator(name = "assignedGen", strategy = "assigned")
    private String email;
    @Basic
    private String challengPassword;
    @Basic
    private String serialNumber;
}

Hibernate.cfg.xml

...
<mapping class="by.sokol.jpr.data.Licence" />
<mapping class="by.sokol.jpr.data.User" />
...

获取会话的Java代码

...
AnnotationConfiguration cfg = new AnnotationConfiguration();
cfg.configure(new File(PROPERTIES_FILENAME));
sessionFactory = cfg.buildSessionFactory();
...

用于保存许可证对象的Java代码

org.hibernate.Transaction t = session.beginTransaction();
session.saveOrUpdate(licence);
t.commit();

生成的sql：

Hibernate: select this_.licenceId as licenceId0_2_, this_.creationDate as creation2_0_2_, this_.limitDate as limitDate0_2_, this_.user_useremail as user4_0_2_, this_.workstation_motherboardId as workstat5_0_2_, user1_.useremail as useremail1_0_, user1_.challengPassword as challeng2_1_0_, user1_.city as city1_0_, user1_.company as company1_0_, user1_.name as name1_0_, user1_.po as po1_0_, user1_.serialNumber as serialNu7_1_0_, user1_.street as street1_0_, user1_.ubication as ubication1_0_, user1_.uid as uid1_0_, workstatio4_.motherboardId as motherbo1_2_1_, workstatio4_.computerName as computer2_2_1_, workstatio4_.macAddress as macAddress2_1_, workstatio4_.osId as osId2_1_ from Licence this_ inner join Usr user1_ on this_.user_useremail=user1_.useremail left outer join Workstation workstatio4_ on this_.workstation_motherboardId=workstatio4_.motherboardId where user1_.useremail=?
Hibernate: select nextval ('hibernate_sequence')
Hibernate: insert into Licence (creationDate, limitDate, user_useremail, workstation_motherboardId, licenceId) values (?, ?, ?, ?, ?)

APPEND_1：工作代码

org.hibernate.Transaction t = session.beginTransaction();
session.save(licence.getUser());
session.save(licence);
t.commit();

并且hibernate不会保存用户。我真的需要帮助！

Answer 1

除非您需要@Cascade，否则我建议删除delete-orphan注释。

仅使用cascade = {CascadeType.MERGE, CascadeType.PERSIST}

要注意的另一件事是你是否使用AnnotationConfiguration。如果没有，则根本不解析您的注释。

更新：您确定自己的用户设置了email字段吗？我建议为User的主键设置一个自动生成的ID。 email是业务密钥，应在其上实施hashCode()和equals()。

Answer 2

您的用户是否被定义为实体？不确定它是否适用于hbm和注释混合。关系是双向的吗？也许你可以展示用户类？

Hibernate注释级联不起作用

2 个答案: