Hibernate two-way one-to-many test - query class information by student

a test code

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;

/*

* One-way many-to-one (student--->class)

* In fact, two-way one-to-many has been established, also known as two-way many-to-one

* It is convenient for students to find the corresponding class information, and it is also easy to find other included student information in the right class

*/

public class Test02 {

    public static void main(String[] args) {

        //save();

        findGradeByStudents();

    }

        

    //Query the class information of the student

    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);

        

    }

}

 

Two test results

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=?

1, Xiao Mumu, male

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=?

 

1, Java class, Java software development class