Hibernate's simulation of three-table problem mapping of multiple manytomany to 3 table annotations-corresponds to (17) XML version (23)

1

Package com.bjsxt.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;
 }
	
}

2

Package com.bjsxt.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;
	}
	
}

3

Package com.bjsxt.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;
	}
	
}