我一直在研究JPA / Hibernate @Entity继承一段时间,似乎无法找到解决我想要实现的问题的任何东西.
基本上我希望能够根据需要定义一个包含所有列和表映射的@Entity.然后,我希望能够使用在每个“子实体”的主体中定义的不同@Transient方法集在多个不同位置扩展@Entity.这是我想要实现的基本示例,但到目前为止没有成功：
@Entity
@Table(name = "mountain")
public class MountainEntityBase implements Serializable {
public Integer mountainId = 0;
public Integer height = 0;
public List<ExplorerEntityBase> explorers = new ArrayList<ExplorerEntityBase>();
@Id
@GeneratedValue
@Column(name = "mountain_id")
public Integer getMountainId() { return mountainId; }
public void setMountainId(Integer mountainId) { this.mountainId = mountainId; }
@Column(name="height")
public String getHeight() { return height; }
public void setHeight(String height) { this.height = height; }
@OneToMany(mappedBy="mountainId")
public List<ExplorerEntityBase> getExplorers() { return this.explorers; }
public void setExplorers(List<ExplorerEntityBase> explorers) { this.explorers = explorers; }
}
.
@Entity
public class MountainEntity extends MountainEntityBase implements Serializable {
public List<MountainEntity> allMountainsExploredBy = new ArrayList<MountainEntity>();
@Transient
public List<MountianEntity> getAllMountainsExploredBy(String explorerName){
// Implementation
}
}
因此任何扩展类都只在其体内定义@Transients.但是我也希望允许子类为空的情况：
@Entity
public class MountainEntity extends MountainEntityBase implements Serializable {
}
在此先感谢您的帮助.
