另一个映射实体错误的重复列是什么?

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尽管所有其他人都发布了,但在MacOSX,NetBeans 7.2上,我找不到GlassFish出现此错误的解决方案:

Here the error :
SEVERE: Exception while invoking class org.glassfish.persistence.jpa.JPADeployer
prepare method
SEVERE: Exception while preparing the app
SEVERE: [PersistenceUnit: supmarket] Unable to build EntityManagerFactory

...

Caused by: org.hibernate.MappingException: Repeated column in mapping for entity:
com.supmarket.entity.Sale column: customerId
(should be mapped with insert="false" update="false")

代码如下:

Sale.java

@Entity
public class Sale {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(nullable=false)
    private Long idFromAgency;

    private float amountSold;

    private String agency;

    @Temporal(javax.persistence.TemporalType.DATE)
    private Date createdate;

    @Column(nullable=false)
    private Long productId;

    @Column(nullable=false)
    private Long customerId;

    @ManyToOne(optional=false)
    @JoinColumn(name="productId",referencedColumnName="id_product")
    private Product product;

    @ManyToOne(optional=false)
    @JoinColumn(name="customerId",referencedColumnName="id_customer")
    private Customer customer;


    public void Sale(){}    
    public void Sale(Long idFromAgency, float amountSold, String agency
            , Date createDate, Long productId, Long customerId){        
        ...
    }

    // then getters/setters
}

Customer.java

@Entity
public class Customer {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name="id_customer")
    private Long id_customer;

    @Column(nullable=false)
    private Long idFromAgency;

    private String  gender,
                    maritalState,
                    firstname,
                    lastname,
                    incomeLevel;

    @OneToMany(mappedBy="customer",targetEntity=Sale.class, fetch=FetchType.EAGER)
    private Collection sales;


    public void Customer(){}

    public void Customer(Long idFromAgency, String gender, String maritalState,
            String firstname, String lastname, String incomeLevel) {
        ...
    }

}

Product.java

public class Product {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name="id_product")
    private Long id_product;

    @Column(nullable=false)
    private Long idFromAgency;

    private String name;

    @OneToMany(mappedBy="product",targetEntity=Sale.class, fetch=FetchType.EAGER)
    private Collection sales;

    //constructors + getters +setters
}
提问于
用户回答回答于

消息很明确:映射中有一个重复的列,这意味着你映射了两次相同的数据库列:

@Column(nullable=false)
private Long customerId;

并且:

@ManyToOne(optional=false)
@JoinColumn(name="customerId",referencedColumnName="id_customer")
private Customer customer;

你不应该通过他们的ID引用其他实体,而是通过直接引用该实体。删除该customerId字段,这是没用的。并做同样的事情productId。如果你想要一个销售的客户ID,你只需要这样做:

sale.getCustomer().getId()
用户回答回答于

如果你遗留的遗留数据库中有人已经放置了JPA批注但尚未定义关系,并且你现在正在尝试将其定义为用于你的代码,在那种情况下,定义如下关系:

@ManyToOne(optional=false)
@JoinColumn(name="productId",referencedColumnName="id_product", insertable=false, updatable=false)
private Product product;

@ManyToOne(optional=false)
@JoinColumn(name="customerId",referencedColumnName="id_customer", insertable=false, updatable=false)
private Customer customer;

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