hibernate 多对多 单向关联

package com.bjsxt.hibernate;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;

@Entity
@Table(name="t_teacher")
public class User {
@Id
@GeneratedValue
private int id;
private String name;
@ManyToMany
@JoinTable(name="t_teacher_student",joinColumns={@JoinColumn(name="teacher_Id")},inverseJoinColumns={@JoinColumn(name="student_Id")})

// 这个地方的1jointable  是 两张表的中间表  name属性为当前中间表的名字，2joinColumns 里面的 joinColumn 的name 指的是 :中间表中对应teacher表的  字段

起名叫teacher_Id ，3  inverseJoinColumn 指的是  另一个类表student 对应  中间表t_teacher_student的字段起名为student_Id;



private Set<Group> students = new HashSet<Group>();

public Set<Group> getStudents() {
return students;
}

public void setStudents(Set<Group> students) {
this.students = students;
}

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;
}
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package com.bjsxt.hibernate;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;

@Entity
@Table(name="t_student")
public class Group {
@Id
@GeneratedValue
private int id;

private String name;

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;
}


}

}