hibernate实现学生-课程-成绩

1.实体类Student

package com.test.model;

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

@Entity
public class Student {
    private int id;
    private String name;
    
    @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;
    }
}

2.实体类Course

package com.test.model;

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

@Entity
public class Course {
    private int id;
    private String name;
    
    @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;
    }
}

3.实体类

package com.test.model;

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

@Entity
public class Score {
    private int id;
    private int score;
    private Student student;
    private Course course;
    
    @Id
    @GeneratedValue
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getScore() {
        return score;
    }
    public void setScore(int score) {
        this.score = score;
    }
    @ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER)
    @JoinColumn(name="StudentId")
    public Student getStudent() {
        return student;
    }
    public void setStudent(Student student) {
        this.student = student;
    }
    
    @ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER)
    @JoinColumn(name="CourseId")
    public Course getCourse() {
        return course;
    }
    public void setCourse(Course course) {
        this.course = course;
    }
}

4.测试类

package com.test.test;

import org.hibernate.classic.Session;

import com.test.Util.HibernateUtil;
import com.test.model.Course;
import com.test.model.Score;
import com.test.model.Student;

public class StudentManager {
    public static void main(String[] args) {
        new StudentManager().testSave();
    }
    
    public void testSave() {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        
        Student s = new Student();
        s.setName("张三");
        Course c = new Course();
        c.setName("语文");
        Score sc = new Score();
        sc.setScore(80);
        sc.setStudent(s);
        sc.setCourse(c);
        
        Student s1 = new Student();
        s1.setName("李四");
        Course c1 = new Course();
        c1.setName("数学");
        Score sc1 = new Score();
        sc1.setScore(90);
        sc1.setStudent(s1);
        sc1.setCourse(c1);
        
        Student s2 = new Student();
        s2.setName("王五");
        Score sc2 = new Score();
        sc2.setScore(70);
        sc2.setStudent(s2);
        sc2.setCourse(c1);
        
        session.save(sc);
        session.save(sc1);
        session.save(sc2);
        session.getTransaction().commit();
    }
}