Hibernate one-to-one mapping with Composite key

1.Annotation

 

Husband class: @JoinColumns ({@JoinColumn(name="",referencedColumnName="") , @JoinColumn(name="",referencedColumnName="")})

 

@Entity
public class Husband {
        private int id;
        private String name;
        private Wife wife;
        
        @Id
        @GeneratedValue
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        
        @OneToOne
        //name of the column; By default is (wife_id)
        @JoinColumns(
           { 
             　@JoinColumn(name="wifeId",referencedColumnName="id"),                              
               @JoinColumn(name="wifeName",referencedColumnName="name") 
            }
        )
        public Wife getWife() {
            return wife;
        }
        public void setWife(Wife wife) {
            this.wife = wife;
        }
        
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
}      


@Entity
@IdClass(value=WifePK.class)
public class Wife {
    private int id;
    private String name;
    private int age;

    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Id
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Id
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

public class WifePK implements java.io.Serializable{
    private int id;
    private String name;
    
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
    public boolean equal(Object o){
        if(o instanceof WifePK){
            WifePK p=(WifePK)o;
            if(this.name.equals(p.getName())&&this.id==p.getId()){
                return true;
            }
        }
        return false;
    }
    public int hashCode(){
        return this.name.hashCode();
    }
}                  

 

2.XML

Student class: under <many-to-one name="xx"> tag, we should name each column of  composite primary key of xx as <column name="xx"> 

 

<hibernate-mapping package="com.hibernate.model">
<class name="Student">
   <id name="id"></id>
	<property name="name"></property>
	<property name="age"></property>
	<property name="classID"></property>
    <many-to-one name="stuIdCard" >
       <column name ="id_fk"/>
       <column name ="name_fk"/>
    </many-to-one>
</class>


<class name="com.hibernate.model.StuIdCard">
	 <composite-id name="pk" class="com.hibernate.model.StudentPK">
	 	<key-property name="id"></key-property>
	 	<key-property name="name"></key-property>
	</composite-id>
	<property name="num"></property>
</class>