我是使用Maven和JBOSS处理JPA的初学者,通过Restful使我的应用程序出现以下问题,我在进行DEPLOY

Caused by: javax.persistence.PersistenceException: [PersistenceUnit: com.company.test_resources_war_1.0-SNAPSHOTPU] Unable to build EntityManagerFactory
     Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: database.Photo column: fid_module (should be mapped with insert = \ "false \" update = \ "false \") "}}

不是那一步,请检查所有posles解决方案,但是没有找到任何东西,有人可以帮助我吗?

提前致谢

在下面,我显示了我已经完成的映射以及postgres中的SQL代码。

我有三个表( Activity 事件照片),其中三个表(照片)引用了另外两个表( Activity 事件列(即imgt_rstrong列)。 )

SQL代码(工程师数据库-> Postgresql):

CREATE TABLE activity (
  id_activity integer not null,
  name character varying(150),
  description text,
  CONSTRAINT id_activity_pk PRIMARY KEY (id_activity)
)

CREATE TABLE event (
  id_event integer not null,
  name character varying(150),
  description text,
  date timestamp without time zone,
  CONSTRAINT id_event_pk PRIMARY KEY (id_event)
)

CREATE TABLE photo(
  id_photo integer not null,
  path character varying(150),
  fid_module integer not null,
  CONSTRAINT id_photo_pk PRIMARY KEY (id_photo),
  CONSTRAINT fk_photo_activity FOREIGN KEY (fid_module)
      REFERENCE activity (id_activity) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION,
  CONSTRAINT fk_photo_event FOREIGN KEY (fid_module)
      REFERENCE event (id_event) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION
)

现在,我在Netbenas的帮助下完成了映射,并提供了以下代码(我为三个表进行了映射,但在向我展示问题时是在 Photo.java 类中)。
@Entity
@Table(name = "photo")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "photo.findAll", query = "SELECT p FROM Photo p"),
    @NamedQuery(name = "photo.findByFidPhoto", query = "SELECT p FROM Photo p WHERE p.fidphoto = :fidphoto"),
    @NamedQuery(name = "photo.findByIdPhoto", query = "SELECT p FROM Photo p WHERE p.idphoto = :idphoto")})
public class Photo implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id_photo")
    private Integer idPhoto;
    @Column(name = "path")
    private Recurso fidPath;
    @JoinColumn(name = "fid_module", referencedColumnName = "id_activity")
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private SliderWebHome fidModule;
    @JoinColumn(name = "fid_module", referencedColumnName = "id_event")
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private Publicacion fidModule1;

    public ModuloRecurso() {
    }
    .......
}

我正在使用JPA进行持久化(但是请执行mvn clean install和 mvn jboss-as:部署几个使我进入 hibernate 依赖关系)有人可以告诉我我的错误是什么,或者可以解决此问题。谢谢。

最佳答案

如另一个答案所述,您的Java代码为两个字段指定了相同的联接列名称,这是行不通的。

如果此Java代码是由netbeans映射工具生成的,如您的注释所示



错误的Java映射可能是由于SQL中约束的错误组合引起的。

您在photo表的定义中具有:

  CONSTRAINT fk_photo_activity FOREIGN KEY (fid_module)
      REFERENCE activity (id_activity) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION,
  CONSTRAINT fk_photo_event FOREIGN KEY (fid_module)
      REFERENCE event (id_event) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION

试图使fid_module列成为引用activity的外键以及引用event的外键,这是行不通的。

如果需要从photo到这两个表的外键,则需要使用两个不同的列。

07-24 09:44
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