Hibernate Annotation Many2OneUnidirectAssociationJoin

Member

package com.todd.bean;

import java.io.Serializable;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;


@Entity
@Table(name = "many2one_unidirect_association_join_member")
public class Many2OneUnidirectAssociationJoinMember implements Serializable{

    private int member_id;
    private String user_id;
    private String user_name;
    private String member_desc;

    private Many2OneUnidirectAssociationJoinSkill skill;
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "member_id")    
    public int getMember_id() {
        return member_id;
    }
    public void setMember_id(int member_id) {
        this.member_id = member_id;
    }
    
    @Column(name = "user_id")
    public String getUser_id() {
        return user_id;
    }
    public void setUser_id(String user_id) {
        this.user_id = user_id;
    }

    @Column(name = "user_name")
    public String getUser_name() {
        return user_name;
    }
    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }

    
    @Column(name = "member_desc")
    public String getMember_desc() {
        return member_desc;
    }
    public void setMember_desc(String member_desc) {
        this.member_desc = member_desc;
    }


    
    @ManyToOne(optional=true)
    @JoinTable(name = "many2one_unidirect_association_join_member_skill",
        joinColumns = {
            @JoinColumn(name="fk_member_id", unique = true)            
        },
        inverseJoinColumns = {
            @JoinColumn(name="fk_skill_id")
        }
    )
    public Many2OneUnidirectAssociationJoinSkill getSkill() {
        return skill;
    }
    public void setSkill(Many2OneUnidirectAssociationJoinSkill skill) {
        this.skill = skill;
    }
}

Skill

package com.todd.bean;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;


@Entity
@Table(name = "many2one_unidirect_association_join_skill")
public class Many2OneUnidirectAssociationJoinSkill implements Serializable{

    private int skill_id;
    private String user_id;
    private String skill;
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "skill_id")    
    public int getSkill_id() {
        return skill_id;
    }
    public void setSkill_id(int skill_id) {
        this.skill_id = skill_id;
    }
    
    @Column(name = "user_id")
    public String getUser_id() {
        return user_id;
    }
    public void setUser_id(String user_id) {
        this.user_id = user_id;
    }
    
    @Column(name = "skill")
    public String getSkill() {
        return skill;
    }
    public void setSkill(String skill) {
        this.skill = skill;
    }
}

Test

package com.todd.bean;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;

import junit.framework.TestCase;

import com.todd.HibernateAnnotationHelper;

/**
 * 1.多個member 有共同的 skill時
 * 2.
 * @author Todd
 */
public class Many2OneUnidirectAssociationJoinMyTestCaseA extends TestCase {


    public void test(){
        
        Session session = HibernateAnnotationHelper.getSessionFactory().openSession();        
        Transaction tx = session.beginTransaction();

        Many2OneUnidirectAssociationJoinMember member1 = new Many2OneUnidirectAssociationJoinMember();
        member1.setUser_id("ots520");
        member1.setUser_name("ots520");
        member1.setMember_desc("ots520 desc1");

        Many2OneUnidirectAssociationJoinMember member2 = new Many2OneUnidirectAssociationJoinMember();
        member2.setUser_id("todd");
        member2.setUser_name("todd");
        member2.setMember_desc("ots520 desc2");

        
        Many2OneUnidirectAssociationJoinSkill skill = new Many2OneUnidirectAssociationJoinSkill();
        skill.setUser_id("這情況應該不用有 user_id了吧");
        skill.setSkill("ass");
        session.save(skill);
        
        member1.setSkill(skill);
        member2.setSkill(skill);
        session.save(member1);
        session.save(member2);
        
        
        
        Many2OneUnidirectAssociationJoinMember JoinMember = (Many2OneUnidirectAssociationJoinMember) session.get(Many2OneUnidirectAssociationJoinMember.class, 7);
        if(!(JoinMember == null)){
            System.out.println("JoinMember=" + JoinMember.getSkill().getSkill_id());
        }
        
        tx.commit();
        session.close();        
        
    }
}