Hibernate 按备用键休眠OneToOne

通过非主键，我有两个表处于一对一的关系中。我正试图映射如下实体：

@Entity
public class FirstEntity implements Serializable {

    @Id
    private Long id;

    private String code;

    @OneToOne(mappedBy = "firstEntity")
    private SecondEntity secondEntity;

}

@Entity
public class SecondEntity {

    @Id
    private Long id;

    @OneToOne
    @JoinColumn(name = "first_entity_code", referencedColumnName = "code")
    private FirstEntity firstEntity;

    private String value;
}

@ManyToOne
@JoinColumn(name = "first_entity_code", referencedColumnName = "code")
private FirstEntity firstEntity;

@OneToMany(mappedBy = "firstEntity")
private List<SecondEntity> secondEntity;

但当我尝试选择第一个实体时，hibernate会生成以下SQL：

select
        firstentit0_.id as id1_0_1_,
        firstentit0_.code as code2_0_1_,
        secondenti1_.id as id1_1_0_,
        secondenti1_.first_entity_code as first_en3_1_0_,
        secondenti1_.value as value2_1_0_ 
    from
        FirstEntity firstentit0_ 
    left outer join
        SecondEntity secondenti1_ 
            on firstentit0_.id=secondenti1_.first_entity_code 
    where
        firstentit0_.code=?

当我将映射从@OneToOne更改为@ManyToOne和@OneToMany时，如下所示：

@Entity
public class FirstEntity implements Serializable {

    @Id
    private Long id;

    private String code;

    @OneToOne(mappedBy = "firstEntity")
    private SecondEntity secondEntity;

}

@Entity
public class SecondEntity {

    @Id
    private Long id;

    @OneToOne
    @JoinColumn(name = "first_entity_code", referencedColumnName = "code")
    private FirstEntity firstEntity;

    private String value;
}

@ManyToOne
@JoinColumn(name = "first_entity_code", referencedColumnName = "code")
private FirstEntity firstEntity;

@OneToMany(mappedBy = "firstEntity")
private List<SecondEntity> secondEntity;

@ManyToOne
@JoinColumn（name=“first\u entity\u code”，referencedColumnName=“code”）
私人第一实体第一实体；
@OneToMany（mappedBy=“firstEntity”）
私有实体；

一切正常。

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我不明白第一个例子有什么问题。有没有办法通过非主键映射双向一对一关联

您使用的是什么hibernate版本？@SternK我使用的是5.2.15.Final版本，但我也能在5.4.0.Final上复制这个例子。看起来像本机查询：@query（value=“select F.from FirstEntity F left join SecondEntity S S on S.first_entity_code=F.code和F.code=：code”，nativeQuery=true）FirstEntity findByCodeCustomNative（@Param（“code”）字符串代码）；*不太管用。