java - 除主以外的 Hibernate OneToMany 关联

Question

我正在尝试使用主列以外的列在两个表之间建立一对多关系。我想要 Asset.assetnum 和 SoftLink.assetnum 之间的联接。我正在使用 hibernate 4，它总是在primary 之间生成关系。

从 ASSET this_ 左外连接 this_.ASSETID=soft3_.ASSETNUM

上的 SOFTLINKS soft3_

我真正想要的

从 ASSET this_ 左外连接 this_.ASSETNUM=soft3_.ASSETNUM

上的 SOFTLINKS soft3_

如果我遗漏了什么，请提出建议。

@Entity
@Table(name="ASSET")
public class Asset {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name="ASSETID", nullable = false)
    private int assetid;

    @Column(name="ASSETNUM", nullable = true)
    private String assetnum;    

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "asset") 
    private List<SoftLinks> softlinks = new ArrayList<SoftLinks>(); 
}

@Entity
@Table(name="SOFTLINK")
public class SoftLinks {
    @Id 
    @Column(name="SOFTLINKID", nullable = false)    
    private String softlinkid;

    @Column(name="ASSETNUM", nullable = true)
    private String assetnum;    

    @ManyToOne
    @JoinColumn(name = "ASSETNUM", insertable = false, updatable = false)
    private Asset asset;
}

Answer 1

在 SoftLinks 类中，您需要将 @ManyToOne 关联更改为:

@ManyToOne
@JoinColumn(name = "ASSETNUM", referencedColumnName = "ASSETNUM", insertable = false, updatable = false)
private Asset asset;