我已经定义了我的两个实体类User和Permission之间的多对多关系.用户具有username和countyId的主键组合,我的Permission表具有常规整数Id.表UserPermission具有三个外键作为其主键：username,countyId和permissionId.

由于这是一个遗留数据库,我将无法使用Right Thing(™)并在User上创建一个整数主键.

我在User.class中定义了这样的多对多关系：

@ManyToMany(targetEntity=Permission.class,cascade={ CascadeType.PERSIST,CascadeType.MERGE } )

@JoinTable(name="tblUserPermission",joinColumns = { @JoinColumn(name="username"),@JoinColumn(name="countyId") },inverseJoinColumns = { @JoinColumn(name="permissionId") })

private Collection

Permission.class说：

@ManyToMany( cascade = {CascadeType.PERSIST,CascadeType.MERGE},mappedBy = "permissions",targetEntity = User.class )

private Collection

我认为这是要走的路,但是当我启动使用Hibernate 3的Spring上下文时,我得到：

Caused by: org.hibernate.AnnotationException: A Foreign key refering com.mydomain.data.entities.User from com.mydomain.data.entities.Permission has the wrong number of column. should be 1

我在注释中做错了什么？应该是2,而不是1.

更新：

Arthur建议我添加referencedColumnName,但这给了我一个新的异常：

Caused by: org.hibernate.AnnotationException: referencedColumnNames(username,countyId) of com.mydomain.data.entities.Permission.permissions referencing com.mydomain.data.entities.User not mapped to a single property

根据他的要求,请遵循以下代码：

Permission.Class：

package com.mydomain.data.entities;

import java.io.Serializable;

import java.util.Collection;

import javax.persistence.*;

import org.hibernate.annotations.ForeignKey;

@Entity

@Table(name = "tblPermission")

public class Permission extends PublishableEntityImpl implements Serializable,Cloneable {

private static final long serialVersionUID = 7155322069731920447L;

@Id

@Column(name = "PermissionId",length = 8,nullable = false)

private String PermissionId = "";

@ManyToOne(fetch=FetchType.LAZY)

@JoinColumn(name = "CountyId",nullable = false)

@ForeignKey(name="FK_CountyID")

private County county;

@Column(name = "Permission",nullable = true)

private Integer permission = 1;

@ManyToMany( cascade = {CascadeType.PERSIST,mappedBy = "Permissions",targetEntity = Item.class )

private Collection

和User.class

package com.mydomain.data.entities;

import java.util.*;

import java.io.Serializable;

import javax.persistence.*;

import org.hibernate.annotations.ForeignKey;

import org.hibernate.annotations.IndexColumn;

import org.springframework.security.core.GrantedAuthority;

import org.springframework.security.core.authority.GrantedAuthorityImpl;

import org.springframework.security.core.userdetails.UserDetails;

@Entity

@Table(name = "tblUser")

public class User extends PublishableEntityImpl implements Serializable,Cloneable {

@Id

@Column(name = "CountyId",nullable = false)

private Integer countyId;

@Id

@Column(name = "Username",length = 25,nullable = false)

private String username;

@ManyToOne(fetch=FetchType.LAZY)

@JoinColumn(name = "CountyId",nullable = false,insertable=false,updatable=false)

@ForeignKey(name="FK_CountyID")

private County county;

@Column(name = "Name",length = 50,nullable = true)

private String name;

@Column(name = "Password",length = 30,nullable = true)

private String password;

@Column(name = "Role",nullable = false)

private Integer role;

@ManyToMany(targetEntity=Permission.class,CascadeType.MERGE } )

@JoinTable(name="tblUserPermission",joinColumns = { @JoinColumn(name="Username",referencedColumnName="Username"),@JoinColumn(name="CountyId",referencedColumnName="CountyId") },inverseJoinColumns = { @JoinColumn(name="PermissionId",referencedColumnName="PermissionId") })

private Collection

干杯

聂