Java 共享主键生成。冬眠

我在生成使用共享主键的一对一关系的主键时遇到问题

以下是代码：

@Entity
@Table(name = "osoba")
public class Osoba implements Serializable
{

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

    @PrimaryKeyJoinColumn
    @OneToOne(cascade = CascadeType.PERSIST)
    public Pracownik pracownik;
...

二等舱：

@Entity
@Table(name = "pracownik")
public class Pracownik
{ 
    @OneToOne
    @JoinColumn(name = "osoba_id")
    @MapsId("osobaId")
    private Osoba osoba;

    @Id
    @Column(name = "osoba_id")
    private Integer osobaId;
...

我也遇到过类似的问题，我认为我做的每件事都是正确的，但我仍然有信心

org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): entity.Pracownik

---

尝试持久化Pracownik对象时

您需要遵循案例中的示例，使用@Id而不是@EmbeddedId：

@OneToOne关系的反方向应与mappedBy映射，通常情况下：

@Entity
@Table(name = "osoba")
public class Osoba implements Serializable {
    ...
    @OneToOne(mappedBy = "osoba", cascade = CascadeType.PERSIST)
    public Pracownik pracownik;
    ...
}

---

这是一个老问题，但它对我有用。也许它会帮助别人

SQL脚本Oracle

DROP TABLE HIBERNATE.PRACOWNIK;
DROP TABLE HIBERNATE.OSOBA;
DROP SEQUENCE HIBERNATE.OSOBA_SEQ;

CREATE TABLE HIBERNATE.OSOBA (
osoba_id                                NUMBER(15),
CONSTRAINT OSOBA_PK PRIMARY KEY (osoba_id)
);

CREATE TABLE HIBERNATE.PRACOWNIK (
    pracownik_id                                NUMBER(15),
    CONSTRAINT PRACOWNIK_PK PRIMARY KEY (pracownik_id),
    CONSTRAINT PRACOWNIK_FK FOREIGN KEY (pracownik_id) REFERENCES OSOBA(osoba_id)
);

CREATE SEQUENCE HIBERNATE.OSOBA_SEQ START WITH 1 INCREMENT BY 1 NOCACHE NOCYCLE;

Osoba.java

@Entity
@Table(name = "osoba")
public @Data class Osoba {

    @Id
    @Column(name = "osoba_id")
    @GeneratedValue(generator="osoba-generator", strategy = GenerationType.SEQUENCE)
    @SequenceGenerator(name="osoba-generator", allocationSize = 1, sequenceName = "OSOBA_SEQ")
    private Long osobaId;

    @OneToOne(fetch=EAGER, mappedBy="osoba", cascade=ALL)
    private Pracownik pracownik;
}

Pracownik.java

@Entity
@Table(name="pracownik")
public @Data class Pracownik {

    @Id
    @Column(name = "pracownik_id")
    @GeneratedValue(generator="pracownik-generator")
    @GenericGenerator(name="pracownik-generator", strategy="foreign", parameters=
        @Parameter(name = "property", value = "osoba")
    )
    private Long pracownikId;

    @OneToOne(fetch=FetchType.EAGER)
    @PrimaryKeyJoinColumn
    private Osoba osoba;

}

---

@数据是

对不起，我忘了在Pracownik中粘贴id为的代码部分。现在它被编辑了。我还将@PrimaryKeyJoinColumn替换为mappedBy=osoba。但错误仍然存在。

@Entity
@Table(name="pracownik")
public @Data class Pracownik {

    @Id
    @Column(name = "pracownik_id")
    @GeneratedValue(generator="pracownik-generator")
    @GenericGenerator(name="pracownik-generator", strategy="foreign", parameters=
        @Parameter(name = "property", value = "osoba")
    )
    private Long pracownikId;

    @OneToOne(fetch=FetchType.EAGER)
    @PrimaryKeyJoinColumn
    private Osoba osoba;

}