我是使用maven和JBOSS处理JPA的初学者,使用Restful使我的应用程序出现以下问题我出现了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,检查所有的posles解决方案,但没有找到任何东西,有人可以帮助我吗?
提前致谢
下面我展示了我的postgres中的SQL代码,并进行了映射。
我有三个表(活动,活动和照片),其中一个(照片)引用到另外两个(活动和事件),但是在一个列中( photo.fid_module )
SQL代码(enginer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的帮助下做了映射并给了我以下代码(我为三个表做了映射,但是在向我展示问题是在类 Photo.java )
@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mvn clean install和 mvn jboss-as:deploy 几个拉我hibernate依赖项)任何人都可以告诉我我的错误是什么或者可以解决这个问题。谢谢。
答案 0 :(得分:12)
您有两个使用相同名称映射的列
@JoinColumn(name = "fid_module", referencedColumnName = "id_activity")
@JoinColumn(name = "fid_module", referencedColumnName = "id_event")
更改其中一个名称属性!
查看您的例外情况,您可以阅读:
Repeated column in mapping for entity
答案 1 :(得分:8)
如另一个答案所述,您的Java代码为两个字段指定了相同的连接列名称,这两个字段无效。
如果这个Java代码是由netbeans映射工具生成的,就像从笔记中看到的那样
现在我在Netbenas的帮助下做了映射,并给了我以下代码......
错误的Java映射可能是由SQL中的约束组合不良引起的。
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
尝试使列fid_module
引用引用activity
的外键以及引用event
的外键,这不起作用。
如果您需要从photo
到这两个表的外键,则需要使用两个不同的列。