HIbernate - “引用的外键”从<表2>列数错误。应该是2”错误

Question

我已经寻找这个问题的解决方案有一段时间了。我发现一些线程讨论导致此问题的多对多关系，但我认为这不适用于我的情况，因此我将其发布在新线程中。

我有以下数据库设计： ============================================= =====================================

用户表： PK USER_ID， USER_NAME 唯一， ...

项目表： PK ITEM_ID， FK ITEM_SELLER ->与user.USER_ID的多对一关系， FK ITEM_BUYER ->与user.USER_ID的多对一关系， ...

出价表（用户和项目之间的桥梁）： PK BID_ID， FK BIDDER_ID ->与user.USER_ID的多对一关系， FK ITEM_ID ->与 item.ITEM_ID 的多对一关系， ...

类别表： PK CAT_ID， ...

item_category 表（类别和项目之间的桥梁）： PK ITEM_CAT_ID， FK ITEM_ID ->与 item.ITEM_ID 的多对一关系， FK CAT_ID ->与category.CAT_ID的多对一关系， ...

================================================= =================================

我正在尝试通过 NetBeans 使用 hibernate 进行设置。我找到了一个教程，它引导我完成了 hibernate.cfg、reveng 和 util 文件的设置，并向我展示了如何使用 NetBeans 工具生成 POJO。在本教程中，您应该右键单击 cfg 文件并运行 HQL 查询以确保一切正常工作。我已经使用一个简单的表（上面的用户表）测试了这个过程，一切正常。但是，当我尝试将所有内容放在一起时，出现以下错误：

org.hibernate.AnnotationException：从 GavelDB.Bid 引用 GavelDB.User 的外键列数错误。应该是 2 在 org.hibernate.cfg.annotations.TableBinder.bindFk(TableBinder.java:276) 在 org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:89) 在org.hibernate.cfg.AnnotationConfiguration.processFkSecondPassInOrder（AnnotationConfiguration.java：499） 在 org.hibernate.cfg.AnnotationConfiguration.secondPassCompile（AnnotationConfiguration.java:304） 在 org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1286） 在 org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory（AnnotationConfiguration.java:859） 正如我

之前所说，我之前搜索此问题的所有尝试都将我指向复合键，但我已努力在本设计中避免使用它们，所以我不明白这会是怎样的问题。我是休眠新手，所以我还没有从头开始编写文件的知识库。如果有人能给我一些见解，我将不胜感激。提前致谢！

以下是错误中提到的两个文件供您参考：

BID.JAVA

package GavelDB;
// Generated Feb 10, 2011 12:41:04 PM by Hibernate Tools 3.2.1.GA

import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

/**
 * Bid generated by hbm2java
 */
@Entity
@Table(name="bid"
    ,catalog="gavel1"
)
public class Bid  implements java.io.Serializable {


     private Integer bidId;
     private User user;
     private Item item;
     private Date bidDate;
     private double bidAmt;
     private Double bidMax;

    public Bid() {
    }


    public Bid(User user, Item item, Date bidDate, double bidAmt) {
        this.user = user;
        this.item = item;
        this.bidDate = bidDate;
        this.bidAmt = bidAmt;
    }
    public Bid(User user, Item item, Date bidDate, double bidAmt, Double bidMax) {
       this.user = user;
       this.item = item;
       this.bidDate = bidDate;
       this.bidAmt = bidAmt;
       this.bidMax = bidMax;
    }

     @Id @GeneratedValue(strategy=IDENTITY)

    @Column(name="BID_ID", unique=true, nullable=false)
    public Integer getBidId() {
        return this.bidId;
    }

    public void setBidId(Integer bidId) {
        this.bidId = bidId;
    }
@ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name="BIDDER_ID", nullable=false)
    public User getUser() {
        return this.user;
    }

    public void setUser(User user) {
        this.user = user;
    }
@ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name="ITEM_ID", nullable=false)
    public Item getItem() {
        return this.item;
    }

    public void setItem(Item item) {
        this.item = item;
    }
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="BID_DATE", nullable=false, length=19)
    public Date getBidDate() {
        return this.bidDate;
    }

    public void setBidDate(Date bidDate) {
        this.bidDate = bidDate;
    }

    @Column(name="BID_AMT", nullable=false, precision=22, scale=0)
    public double getBidAmt() {
        return this.bidAmt;
    }

    public void setBidAmt(double bidAmt) {
        this.bidAmt = bidAmt;
    }

    @Column(name="BID_MAX", precision=22, scale=0)
    public Double getBidMax() {
        return this.bidMax;
    }

    public void setBidMax(Double bidMax) {
        this.bidMax = bidMax;
    }

}

ITEM.JAVA

package GavelDB;
// Generated Feb 10, 2011 12:41:04 PM by Hibernate Tools 3.2.1.GA


import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;

/**
 * User generated by hbm2java
 */
@Entity
@Table(name="user"
    ,catalog="gavel1"
    , uniqueConstraints = @UniqueConstraint(columnNames="USER_NAME") 
)
public class User  implements java.io.Serializable {


     private Integer userId;
     private String userName;
     private String pswd;
     private String email;
     private String street;
     private String city;
     private String state;
     private Integer zip;
     private Integer phone;
     private Set<Item> itemsForItemSeller = new HashSet<Item>(0);
     private Set<Item> itemsForItemBuyer = new HashSet<Item>(0);
     private Set<Bid> bids = new HashSet<Bid>(0);

    public User() {
    }


    public User(String userName) {
        this.userName = userName;
    }
    public User(String userName, String pswd, String email, String street, String city, String state, Integer zip, Integer phone, Set<Item> itemsForItemSeller, Set<Item> itemsForItemBuyer, Set<Bid> bids) {
       this.userName = userName;
       this.pswd = pswd;
       this.email = email;
       this.street = street;
       this.city = city;
       this.state = state;
       this.zip = zip;
       this.phone = phone;
       this.itemsForItemSeller = itemsForItemSeller;
       this.itemsForItemBuyer = itemsForItemBuyer;
       this.bids = bids;
    }

     @Id @GeneratedValue(strategy=IDENTITY)

    @Column(name="USER_ID", unique=true, nullable=false)
    public Integer getUserId() {
        return this.userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    @Column(name="USER_NAME", unique=true, nullable=false)
    public String getUserName() {
        return this.userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    @Column(name="PSWD", length=30)
    public String getPswd() {
        return this.pswd;
    }

    public void setPswd(String pswd) {
        this.pswd = pswd;
    }

    @Column(name="EMAIL")
    public String getEmail() {
        return this.email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Column(name="STREET")
    public String getStreet() {
        return this.street;
    }

    public void setStreet(String street) {
        this.street = street;
    }

    @Column(name="CITY")
    public String getCity() {
        return this.city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    @Column(name="STATE")
    public String getState() {
        return this.state;
    }

    public void setState(String state) {
        this.state = state;
    }

    @Column(name="ZIP")
    public Integer getZip() {
        return this.zip;
    }

    public void setZip(Integer zip) {
        this.zip = zip;
    }

    @Column(name="PHONE")
    public Integer getPhone() {
        return this.phone;
    }

    public void setPhone(Integer phone) {
        this.phone = phone;
    }
@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, mappedBy="userByItemSeller")
    public Set<Item> getItemsForItemSeller() {
        return this.itemsForItemSeller;
    }

    public void setItemsForItemSeller(Set<Item> itemsForItemSeller) {
        this.itemsForItemSeller = itemsForItemSeller;
    }
@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, mappedBy="userByItemBuyer")
    public Set<Item> getItemsForItemBuyer() {
        return this.itemsForItemBuyer;
    }

    public void setItemsForItemBuyer(Set<Item> itemsForItemBuyer) {
        this.itemsForItemBuyer = itemsForItemBuyer;
    }
@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, mappedBy="user")
    public Set<Bid> getBids() {
        return this.bids;
    }

    public void setBids(Set<Bid> bids) {
        this.bids = bids;
    }

}