Hibernate 不使用@JoinTable 的名称参数

Question

我有一个小问题，我有一个超类在 PostgreSQL 中为根表定义一个实体。

这个类有2个继承表/类实体，我想在其中添加一个@OneToOne连接表关联：

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@Table(name = "equipement")
public abstract class Equipement
{
   ....
}

@Entity
@Table(name = "nod")
public class Nod extends Equipement
{
    protected Cross cross;

    @OneToOne(cascade = CascadeType.ALL, optional = true, fetch = FetchType.EAGER)
    @JoinTable(name = "assoc_nod_cross", joinColumns = @JoinColumn(name = "nod_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "cross_id", referencedColumnName = "id"))
    public Cross getCross()
    {
        return cross;
    }

    ...
}

@Entity
@Table(name = "cross")
public class Cross extends Equipement
{
    protected Nod nod;

    @OneToOne(cascade = CascadeType.ALL, optional = true, fetch = FetchType.EAGER)
    @JoinTable(name = "assoc_nod_cross", joinColumns = @JoinColumn(name = "cross_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "nod_id", referencedColumnName = "id"))
    public Nod getNod()
    {
        return nod;
    }

    ...
}

当列出所有 Nod 或 Cross 实体时，Hibernate 想在错误的表中搜索 inverseJoinColumns 字段，它不使用名称（assoc_nod_cross），我什至可以放任何东西。

示例：

Hibernate: select cross0_.id as id1_7_, cross0_.nod_id as nod_id2_1_ from cross cross0_

javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not extract ResultSet
...
Caused by: org.postgresql.util.PSQLException: ERROR: column cross0_.node_id does not exist

这是因为@Inheritance 策略的问题吗？这是休眠中的错误吗？我的实体定义有问题吗？

添加信息：我尝试切换到 EclipseLink 以检查它是否是休眠错误/限制，或者我是否在某个地方出错。而且 EclipseLink 运行良好。

Answer 1

这是Cross 和Nod 之间的双向关系吗？如果是这样，您不必以这种方式注释关系的双方。这可能会混淆hibernate。 Here 是它工作的一个例子。我认为应该这样做

@Entity
@Table(name = "nod")
public class Nod extends Equipement
{
    protected Cross cross;

    @OneToOne(cascade = CascadeType.ALL, optional = true, fetch = FetchType.EAGER)
    @JoinTable(name = "assoc_nod_cross", joinColumns = @JoinColumn(name = "nod_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "cross_id", referencedColumnName = "id"))
    public Cross getCross()
    {
        return cross;
    }

    ...
}

@Entity
@Table(name = "cross")
public class Cross extends Equipement
{
    protected Nod nod;

    @OneToOne(mappedBy = "cross")
    public Nod getNod()
    {
        return nod;
    }

    ...
}