外键未在一对多hibernate映射中更新

Question

  

用户类

@Entity
@Table(name="user")
public class User {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="PK_USER_ID")
    private Integer userId;

    @Column(name="FIRST_NAME")
    private String firstName;

    @Column(name="LAST_NAME")
    private String lastName;

    @OneToMany(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
    @JoinColumn(name="FK_USER_ID",referencedColumnName="PK_USER_ID")
    private Set<DeviceInfo> deviceInfos;
}

  

DeviceInfo

@Entity
@Table(name="device_info")
public class DeviceInfo {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="DEVICE_ID")
    private Integer deviceId;

    @Column(name="DEVICE_KEY")
    private String deviceKey;
    @Column(name="FK_USER_ID")
    private Integer userId;
}

当我尝试将数据插入用户表和device_info表时，插入了数据，但是device_info表的外键列未使用用户表的主键更新。

Hibernate版本：4.3.6.Final 春季版：4.3.1

Answer 1

您是否错过了在持久化之前在deviceInfo对象中设置用户对象，代码应如下所示：

user.setDeviceInfo(setOfDeviceInfo);

deviceInfo.setUser(user);

session.save(user);

Answer 2

我认为您的实体DeviceInfo

中缺少@ManyToOne映射

User.java

@Entity
@Table(name="user")
public class User {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="PK_USER_ID")
    private Integer userId;

    @Column(name="FIRST_NAME")
    private String firstName;

    @Column(name="LAST_NAME")
    private String lastName;

    @OneToMany(cascade=CascadeType.ALL,fetch=FetchType.LAZY, mappedBy = "user")
    private Set<DeviceInfo> deviceInfos;
}

DeviceInfo.java

@Entity
@Table(name="device_info")
public class DeviceInfo {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="DEVICE_ID")
    private Integer deviceId;

    @Column(name="DEVICE_KEY")
    private String deviceKey;

  @ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "PK_USER_ID", nullable = false)
    private User user;
}