日期:2014-05-17  浏览次数:20748 次

hibernate中使用annotation,如何设定双向关联
Orgnization.java
Java code
package com.chk.model;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;

@Entity
public class Orgnization {
    private int id;
    private String name;
    private String sn;
    private String description;
    private Orgnization parent;// 父节点
    private Set<Person> persons = new HashSet<Person>();// 子节点

    @Id
    @GeneratedValue
    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 String getSn() {
        return sn;
    }

    public void setSn(String sn) {
        this.sn = sn;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    @ManyToOne
    public Orgnization getParent() {
        return parent;
    }

    public void setParent(Orgnization parent) {
        this.parent = parent;
    }

    @OneToMany(mappedBy = "org")
    public Set<Person> getPersons() {
        return persons;
    }

    public void setPersons(Set<Person> persons) {
        this.persons = persons;
    }

}


Person.java
Java code
package com.chk.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

@Entity
public class Person {
    private int id;
    private String name;
    private String sex;
    private String address;
    private String duty;
    private String phone;
    private String description;
    private Orgnization org;

    @ManyToOne
    public Orgnization getOrg() {
        return org;
    }

    public void setOrg(Orgnization org) {
        this.org = org;
    }

    @Id
    @GeneratedValue
    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 String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getDuty() {
        return duty;
    }

    public void setDuty(String duty) {
        this.duty = duty;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}



一、我要用Annotation的方式,
二、我现在只能通过 “子”找到“父”
问题是:我如何通过 “父”找到“子”

我的测试时代码如下:
test.java
Java code
    @Test
    public void loadtest() {
        Configuration cfg = new Configuration().configure();
        SessionFactory sf = cfg.buildSessionFactory();
        Session s = sf.getCurrentSession();
        s.beginTransaction();

        Orgnization org1 = (Orgnization) s.get(Orgnization.class, 1);
        S