Question

控制台输出：

Caused by: org.hibernate.MappingException: No discriminator found for Subclass. Discriminator is needed when 'single-table-per-hierarchy' is used and a class has subclasses
    at org.hibernate.mapping.SingleTableSubclass.validate(SingleTableSubclass.java:49) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.boot.internal.MetadataImpl.validate(MetadataImpl.java:329) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:443) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:879) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]

我收到此错误但我在课堂上绝对有@DiscriminatorValue。

超类注释：

@Entity
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(
    name="entity_type",
    discriminatorType=DiscriminatorType.STRING
)

控制台错误中包含的子类的注释：

@Entity
@DiscriminatorValue(value="keyword")

我完全不知道该做什么。

编辑：

以下是完整的课程：

超类

@Entity
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(
    name="entity_type",
    discriminatorType=DiscriminatorType.STRING
)
public class Superclass implements java.io.Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private Long segmentId;
    private String entityType;
    private EntityLists positiveEntityList;
    private EntityLists queryExpansionEntityList;
    private EntityLists negativeEntityList;
    private EntityLists queryRestrictionList;

    public Superclass() {
    }

}

子类

@Entity(name = "Subclass")
@DiscriminatorValue(value = "keyword")
public class Subclass extends Superclass implements java.io.Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private Long segmentId;
    private String entityType;
    @OneToOne
    @JoinColumn(name="postive_entity_list_id")
    private KeywordLists positiveEntityList;
    @OneToOne
    @JoinColumn(name = "query_expansion_list_id")
    private KeywordLists queryExpansionEntityList;
    @OneToOne
    @JoinColumn(name = "negative_entity_list_id")
    private KeywordLists negativeEntityList;
    @OneToOne
    @JoinColumn(name = "query_restriction_list_id")
    private KeywordLists queryRestrictionList;

    public Subclass() {
    }
}

编辑2：

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0 个答案: