Hibernate接口多态映射

Question

我最近在学习Hibernate，基本概念对我来说很清楚，但我现在有一个设计问题。我所有的具体类实现接口，这里是代码：包 com;

import javax.persistence.Entity;

public interface Person {
    public void setName(String name);
    public String getName();
    public void setId(Integer id);
    public Integer getId();
    public void setWeapon(Weapon weapon);
    public Weapon getWeapon();
}

````

package com;

import javax.persistence.Entity;

public interface Weapon {
    public void setSharpness(Integer sharpness);
    public Integer getSharpness();
    public void setId(Integer id);
    public Integer getId();
}

````

package com;

import javax.persistence.*;

@Entity
@Table(name = "person_inf")
public class PersonImpl implements Person{
    @Id@GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "person_id")
    private Integer id;
    @Column(name = "person_name")
    private String name;

    @OneToOne(targetEntity = Weapon.class)
    @JoinColumn(name = "weapon_id",referencedColumnName = "weapon_id")
    private Weapon weapon;
setters and getters omitted
}

```` 包 com;

import javax.persistence.*;

@Entity
@Table(name = "weapon_inf")
public class WeaponImpl implements Weapon {
    @Id@GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "weapon_id")
    private Integer id;
    @Column(name = "weapon_sharpness")
    private Integer sharpness;
    setters and getters omitted
}

当我尝试休眠程序（保存一个人的实例）时，它抛出

org.hibernate.AnnotationException: @OneToOne or @ManyToOne on com.PersonImpl.weapon references an unknown entity: com.Weapon

是否有解决这个问题的方案或注解？

Answer 1

您应该引用 WeaponImpl 而不是 Weapon，因为您的实体 class 是 WeaponImpl。

这给了你字段

@OneToOne
@JoinColumn(name = "weapon_id",referencedColumnName = "weapon_id")
private WeaponImpl weapon;

Answer 2

尝试像这样使用 WeaponImpl 而不是 Weapon：

  @OneToOne(targetEntity = WeaponImpl.class)

Hibernate接口多态映射

Hibernate interface polymorphism mapping

java

hibernate

nhibernate-mapping