Hibernate双向一对多测试——通过学生查询班级信息

一 测试代码

package com.imooc.test;

import java.util.Set;

import org.hibernate.Session;

import org.hibernate.Transaction;

import com.imooc.entity.Grade;

import com.imooc.entity.Student;

import com.imooc.util.HibernateUtil;

/*

* 单向多对一（学生--->班级）

* 实际上已经建立了双向一对多，也称双向多对一

* 既可以方便地有学生找到对应的班级信息，也可以方便地右班级查找其他所包含的学生信息

*/

public class Test02 {

    public static void main(String[] args) {

        //save();

        findGradeByStudents();

    }

        

    //查询学生所在的班级信息

    public static void findGradeByStudents(){

        Session session=HibernateUtil.getSession();

        Student student=(Student) session.get(Student.class, 1);

        System.out.println(student.getSid()+","+student.getSname()+","+student.getSex());

        

        Grade g= student.getGrade();

        System.out.println(g.getGid()+","+g.getGname()+","+g.getGdesc());

        HibernateUtil.closeSession(session);

        

    }

}

 

二 测试结果

Hibernate: select student0_.sid as sid1_1_0_, student0_.sname as sname2_1_0_, student0_.sex as sex3_1_0_, student0_.gid as gid4_1_0_ from student student0_ where student0_.sid=?

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Hibernate: select grade0_.gid as gid1_0_0_, grade0_.gname as gname2_0_0_, grade0_.gdesc as gdesc3_0_0_ from grade grade0_ where grade0_.gid=?

 

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