hibernate笔记-013-多对多双向映射

学生-教师

package com.hibernate.entity;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;

@Entity
@Table(name = "t_student")
// 学生
public class Student implements Serializable {

private static final long serialVersionUID = -2005812841024253872L;
@Id
@GeneratedValue(generator = "student_gen")
@GenericGenerator(name = "student_gen", strategy = "native")
private int id;
private String name;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(
// 中间表表名
name = "student_teacher", //
// 中间表学生方列名
joinColumns = { @JoinColumn(name = "student_id") }, //
// 中间表教师方列名
inverseJoinColumns = { @JoinColumn(name = "teacher_id") })
private Set<Teacher> teachers = new HashSet<Teacher>();

public int getId() {
return id;
}

public String getName() {
return name;
}

public Set<Teacher> getTeachers() {
return teachers;
}

public void setId(int id) {
this.id = id;
}

public void setName(String name) {
this.name = name;
}

public void setTeachers(Set<Teacher> teachers) {
this.teachers = teachers;
}

}

package com.hibernate.entity;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;

@Entity
@Table(name = "t_teacher")
// 教师
public class Teacher implements Serializable {

private static final long serialVersionUID = 3543286868313801941L;
@Id
@GeneratedValue(generator = "teacher_gen")
@GenericGenerator(name = "teacher_gen", strategy = "native")
private int id;
private String name;
@ManyToMany(mappedBy = "teachers", cascade = CascadeType.ALL)
private Set<Student> students = new HashSet<Student>();

public int getId() {
return id;
}

public String getName() {
return name;
}

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

public void setId(int id) {
this.id = id;
}

public void setName(String name) {
this.name = name;
}

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

}