Question

我在调用refresh方法时遇到错误。我有下表：Ontology，Publication和ontology_by_publication。

这是本体的pk：ontology_id |自动递增这是出版物的pk：publication_id |自动递增这是ontology_by_publication pk：publication_publication_id，ontology_ontology_id，ontology_by_publication_id

列ontology_by_publication_id具有自动增量设置。

我的OntologyByPublication看起来像这样：

@Entity
@Table(name = "ontology_by_publication")
public class OntologyByPublication implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = -7427863218422284148L;

@EmbeddedId
private OntologyByPublicationId ontologyByPublicationId;

@Column(name = "description")
private String description;

@Column(name = "current_price")
private Double currentPrice;

@MapsId(value = "ontologyId")
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "ontology_ontology_id")
private Ontology ontology;

@MapsId(value = "publicationId")
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "publication_publication_id")
private Publication publication;

getters - setters

这是@Embeddable类：

@Embeddable
public class OntologyByPublicationId implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Column(name = "ontology_by_publication_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long ontologyByPubId;

    @Column(name = "publication_publication_id")
    private Long publicationId;

    @Column(name = "ontology_ontology_id")
    private Integer ontologyId;

我调用下面的方法来持久化OntologyByPublication对象：

public OntologyByPublication saveOntologyByPublicationRefresh(
            OntologyByPublication ontologyByPublication) {
        try
        {
            em.persist(ontologyByPublication);
            em.flush();
            em.refresh(ontologyByPublication);

            return ontologyByPublication;
        }
        catch (Exception ex)
        {
            return null;
        }
    }

当执行包含em.refresh的行时，抛出此异常：

javax.persistence.EntityNotFoundException: No row with the given identifier exists: [org.springtest.mavenspringapp.domain.OntologyByPublication#org.springtest.mavenspringapp.domain.OntologyByPublicationId@73ba7b18]

我不知道我做错了什么。请帮帮我。

调用refresh方法时EmbeddedId出错（Spring + JPA 2 hibernate）

0 个答案: