小编典典

原因:org.hibernate.MappingException:实体映射中的重复列

hibernate

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,检查所有posles解决方案,但是没有找到任何东西,有人可以帮我吗?

提前致谢

下面,我显示了我已经完成映射的postgres中的SQL代码。

我有三个表( 活动事件照片 ),其中一个表( 照片 )引用了另外两个表( 活动事件
),但是在一个列中( 照片.fid_module

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,并给了我以下代码(我对三个表进行了映射,但是在展示给我的时候问题出在 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。


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2020-06-20

共1个答案

小编典典

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

现在,我在Netbenas的帮助下进行了映射,并给了我以下代码…

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

试图使列fid_module成为外键引用activity以及外键引用event,这是行不通的。

如果您需要photo这两个表的外键,则需要使用两个不同的列。

2020-06-20