查询结果

Question

我刚接触spring / hibernate。我写了一个webservice，应该返回完整的对象，有时还会减少对象。例如，我有一个继承自Member类的MemberBase类：

...

**
 * MemberBase
 */

@Entity
@Table(name = "MemberBase")
@Inheritance(strategy = InheritanceType.JOINED)
@SequenceGenerator(name = "idgen", sequenceName = "seq_Member")
public class MemberBase extends BasePojo {

    @Column(name = "alias")
    private String alias = null;
    @Column(name = "firstName")
    private String firstName = null;

    @Column(name = "gender")
    @Enumerated(EnumType.STRING)
    private Gender gender = null;

    @Transient
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "creator")
    @ElementCollection(targetClass=OutingBase.class)
    private Set<OutingBase> outings = null;

...
}

和成员：

...

/**
 * Member
 */
@Entity
@Table(name = "Member")
@SequenceGenerator(name = "idgen", sequenceName = "seq_Member")
public class Member extends MemberBase {


    @Enumerated(EnumType.STRING)
    private MaritalStatus maritalStatus = null;

    @Type(type = "org.jadira.usertype.dateandtime.joda.PersistentLocalDate")
    private LocalDate birthDate = null;

    private String locationName = null;

    private DateTime lastConnexion = null;

    private String description = null;

    private String videoMoodUrl = null;

    private String mood = null;

    private Boolean canCertify = null;

    private String fid = null;
    ...
}

在我的控制器中，我使用hibernate获取成员库列表：

public ResponseEntity<List<MemberBase>> membersGet() {
        Session session = HibernateUtils.getSessionFactory().openSession();
        session.beginTransaction();
        List<MemberBase> personList = session.createQuery("FROM " + MemberBase.class.getName(), MemberBase.class)
                .getResultList();

        session.close();
        return new ResponseEntity<List<MemberBase>>(personList, HttpStatus.OK);
    }

以下是我创建会话工厂的方法：

private static SessionFactory buildSessionFactory() {
        try {
            Configuration configuration = new Configuration().configure();
            configuration.addAnnotatedClass(BasePojo.class);
            configuration.addAnnotatedClass(MemberBase.class);
            configuration.addAnnotatedClass(Member.class);
            configuration.addAnnotatedClass(OutingBase.class);
            configuration.addAnnotatedClass(Outing.class);

            StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder()
                    .applySettings(configuration.getProperties());
            return configuration.buildSessionFactory(builder.build());
        } catch (Throwable ex) {

            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

我的问题是，当我致电membersGet()时，我会检索List<Member>而不是List<MemberBase>的列表。没有崩溃，但我的序列化Json包含太多字段。我实现了这个继承，以避免获取所有Member的字段。我做错了什么？

Answer 1

我建议使用FasterXML Jackson的Thread thread = new Thread(new Runnable() { @Override public void run() { try (Realm realm = Realm.getDefaultInstance()) { // No need to close the Realm instance manually } } }); thread.start(); anotation。

如名称所示，在解析对象时，anotation将导致忽略该属性。

即G。

JsonIgnore

编辑：

使用@JsonIgnore private String locationName = null; 指定应显示/解析属性的视图。 即G。

JsonView

当您映射它时，您可以指定所需的视图。

public class JsonView {
    public static class Base {
    } 
    public static class Extended extends Base {
    }
}

@JsonView(JsonView.Extended.class)
private String locationName = null;

@JsonView(JsonView.Base.class)
private String alias = null;

见这里：http://www.baeldung.com/jackson-json-view-annotation