Question

当我加载父对象（DuaVO）对象时，如何加载子对象（RefAuthorizationVO）。

要加载的主要类方法

DuaVO dua = (DuaVO) session.get(DuaVO.class, "1");

RefAuthorization 儿童

@Entity
@Table(name = "RFRNC_AUTHRZTN")
public class RefAuthorizationVO implements Serializable
{
    @Column(name = "SYS_CREAT_USER_ID")
    private String sysCreatedUserId;

    @Column(name = "SYS_CREAT_TS")
    private Date sysCreatedTimestamp;

    @Column(name = "SYS_UPDT_USER_ID")
    private String sysUpdateUserId;

    @Column(name = "SYS_UPDT_TS")
    private Date sysUpdateTimestamp;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name="AUTHRZTN_CD")
    private String authorizationCode;

    @Column(name="AUTHRZTN_DESC")
    private String authorizationDescription;

DuaVO 家长

@Entity
@Table(name = "DUA")
public class DuaVO implements java.io.Serializable {

    @Id
    @Column(name= "DUA_NUM")
    private String duaNumber;

    // AuditDetails

    @Column(name = "SYS_CREAT_USER_ID")
    private String sysCreatedUserId;

    @Column(name = "SYS_CREAT_TS")
    private Date sysCreatedTimestamp;

    @Column(name = "SYS_UPDT_USER_ID")
    private String sysUpdateUserId;

    @Column(name = "SYS_UPDT_TS")
    private Date sysUpdateTimestamp;

    @Column(name = "DUA_SHRT_DESC")
    private String duaShortDesc;

    @Column(name = "AUTHRZTN_CD")
    private String authorizationCode;

    @ManyToOne
    private RefAuthorizationVO refAuthorizationVO; 

    }

但是，当我试图像这样接触孩子时..

System.out.println("Ref Auth: " + dua.getRefAuthorizationVO() );

我得到了空。

Answer 1

认为你错过了@JoinColumn注释

@JoinColumn(name = "FK_ID", referencedColumnName = "ID")
@ManyToOne

如何在Hibernate中加载子对象

1 个答案: