Hibernate映射Score，Course，Student

最新推荐文章于 2025-07-28 23:27:29 发布

chenggil10

最新推荐文章于 2025-07-28 23:27:29 发布

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文章标签： hibernate string class table

本文链接：https://blog.youkuaiyun.com/chenggil10/article/details/5915921

本文介绍了一个使用Hibernate框架实现Java中学生与课程多对多关系的例子。通过`@ManyToMany`注解及`@JoinTable`定义了中间表`score`来维护学生与课程之间的关联。

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Student.java

package com.aspn.hibernate; import java.util.HashSet; import java.util.Set; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.JoinTable; import javax.persistence.ManyToMany; @Entity public class Student { private int id; private String name; private Set<Course> courses = new HashSet<Course>(); @ManyToMany @JoinTable(name="score", joinColumns=@JoinColumn(name="student_id", referencedColumnName="id"), inverseJoinColumns=@JoinColumn(name="course_id", referencedColumnName="id") ) public Set<Course> getCourses() { return courses; } public void setCourses(Set<Course> courses) { this.courses = courses; } @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; } }

Course.java

package com.aspn.hibernate; 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; } }

Score.java

package com.aspn.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table; @Entity @Table(name="score") 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 @JoinColumn(name="student_id") public Student getStudent() { return student; } public void setStudent(Student student) { this.student = student; } @ManyToOne @JoinColumn(name="course_id") public Course getCourse() { return course; } public void setCourse(Course course) { this.course = course; } }

Student表里面用了

@ManyToMany
@JoinTable(name="score",
  joinColumns=@JoinColumn(name="student_id", referencedColumnName="id"),
  inverseJoinColumns=@JoinColumn(name="course_id", referencedColumnName="id")
  )
public Set<Course> getCourses() {
  return courses;
}

这里JoinTable是自己创建一个临时表，可是已经有了score的表，所以那里面累加字段，

Student->course inverseJoinColumns 的意思是过 Student->score->course 应该是这样的过程。。。务必记住他