Hibernate Annotation One2ManyAndMany2OneBidirectAssociationJoin

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 = "one2many_and_many2one_bidirect_association_join_member")
public class One2ManyAndMany2OneBidirectAssociationJoinMember implements Serializable{

    private int memberId;
    private String userId;
    private String userName;
    private String memberDesc;

    private List skillList;
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "member_id")        
    public int getMemberId() {
        return memberId;
    }
    public void setMemberId(int memberId) {
        this.memberId = memberId;
    }
    
    @Column(name = "user_id")
    public String getUserId() {
        return userId;
    }
    public void setUserId(String userId) {
        this.userId = userId;
    }
    
    @Column(name = "user_name")
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    
    @Column(name = "member_desc")
    public String getMemberDesc() {
        return memberDesc;
    }
    public void setMemberDesc(String memberDesc) {
        this.memberDesc = memberDesc;
    }
    
    
    
//    @OneToMany
//    @JoinTable(name = "one2many_and_many2one_bidirect_association_join_member_skill",
//        joinColumns = {
//            //@JoinColumn(name="fk_member_id", unique = true) //若要 1 對 1的話, 加上 unique
//            @JoinColumn(name="fk_member_id")         
//        },
//        inverseJoinColumns = {
//            @JoinColumn(name="fk_skill_id")
//        }
//    )
    
    @OneToMany(mappedBy = "member")
    public List getSkillList() {
        return skillList;
    }
    public void setSkillList(
            List skillList) {
        this.skillList = skillList;
    }

}

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.JoinTable;
import javax.persistence.ManyToOne;
import javax.persistence.Table;


@Entity
@Table(name = "one2many_and_many2one_bidirect_association_join_skill")
public class One2ManyAndMany2OneBidirectAssociationJoinSkill implements Serializable{

    private int skillId;
    private String userId;
    private String skill;
    
    private One2ManyAndMany2OneBidirectAssociationJoinMember member;
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "skill_id")    
    public int getSkillId() {
        return skillId;
    }
    public void setSkillId(int skillId) {
        this.skillId = skillId;
    }
    
    @Column(name = "user_id")
    public String getUserId() {
        return userId;
    }
    public void setUserId(String userId) {
        this.userId = userId;
    }
    
    @Column(name = "skill")
    public String getSkill() {
        return skill;
    }
    public void setSkill(String skill) {
        this.skill = skill;
    }
    

    @ManyToOne(optional=true)
    @JoinTable(name = "one2many_and_many2one_bidirect_association_join_member_skill",
        joinColumns = {
          @JoinColumn(name="fk_skill_id", unique = true)
        },
        inverseJoinColumns = {
          @JoinColumn(name="fk_member_id")
        }
    )
    public One2ManyAndMany2OneBidirectAssociationJoinMember getMember() {
        return member;
    }
    public void setMember(One2ManyAndMany2OneBidirectAssociationJoinMember member) {
        this.member = member;
    }
    
}

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.雙向的話, 只要把One2Many 或 Many2One 對調就行
 * 2.
 * @author Todd
 */
public class One2ManyAndMany2OneBidirectAssociationJoinMyTestCaseA extends TestCase {


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

        One2ManyAndMany2OneBidirectAssociationJoinMember member = new One2ManyAndMany2OneBidirectAssociationJoinMember();
        member.setUserId("ots520");
        member.setUserName("ots520");
        member.setMemberDesc("ots520 desc");
        
        List skillList = new ArrayList();
        
        One2ManyAndMany2OneBidirectAssociationJoinSkill skill1 = new One2ManyAndMany2OneBidirectAssociationJoinSkill();
        skill1.setUserId("ots520");
        skill1.setSkill("skill1");
        skill1.setMember(member);
        session.save(skill1);
        skillList.add(skill1);
        
        One2ManyAndMany2OneBidirectAssociationJoinSkill skill2 = new One2ManyAndMany2OneBidirectAssociationJoinSkill();
        skill2.setUserId("ots520");
        skill2.setSkill("skill2");
        skill2.setMember(member);
        session.save(skill2);
        skillList.add(skill2);

        
        member.setSkillList(skillList);
        session.save(member);

        
        
        
        One2ManyAndMany2OneBidirectAssociationJoinMember JoinMember = (One2ManyAndMany2OneBidirectAssociationJoinMember) session.get(One2ManyAndMany2OneBidirectAssociationJoinMember.class, 3);
        if(!(JoinMember == null)){
            List list = JoinMember.getSkillList();
            for (One2ManyAndMany2OneBidirectAssociationJoinSkill one2ManyAndMany2OneBidirectAssociationJoinSkill : list) {
                System.out.println("one2ManyAndMany2OneBidirectAssociationJoinSkill=" + one2ManyAndMany2OneBidirectAssociationJoinSkill.getSkillId());
            }
        }
        
        One2ManyAndMany2OneBidirectAssociationJoinSkill JoinSkill = (One2ManyAndMany2OneBidirectAssociationJoinSkill) session.get(One2ManyAndMany2OneBidirectAssociationJoinSkill.class, 4);
        if(!(JoinSkill == null)){
            One2ManyAndMany2OneBidirectAssociationJoinMember JoinSkillMember = JoinSkill.getMember();
            System.out.println("JoinSkillMember=" + JoinSkillMember.getMemberId());
        }
        
        tx.commit();
        session.close();        
        
    }

}