Hibernate annotation 多对多双向关联(很少用)

双向关联 在认为的 主表 上用到 @JoinTable

 

package com.hibernate.entity;import java.io.Serializable;import java.util.HashSet;import java.util.Set;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.ManyToMany;@Entitypublic class Student implements Serializable {/** *  */private static final long serialVersionUID = 3543286868313801941L;private int id;private String name;private Set<Teacher> teachers = new HashSet<Teacher>();@Id@GeneratedValuepublic 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;}@ManyToMany(mappedBy="students")//students 是 teacher类里的student属性public Set<Teacher> getTeachers() {return teachers;}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.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.JoinTable;import javax.persistence.ManyToMany;@Entitypublic class Teacher implements Serializable {/** *  */private static final long serialVersionUID = 3543286868313801941L;private int id;private String name;private Set<Student> students = new HashSet<Student>();@Id@GeneratedValuepublic 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;}@ManyToMany@JoinTable(    name="s_t",    joinColumns=        @JoinColumn(name="teacherid", referencedColumnName="id"),//当前表里的id    inverseJoinColumns=        @JoinColumn(name="studentid", referencedColumnName="id")//与此相对应的表里的id    )public Set<Student> getStudents() {return students;}public void setStudents(Set<Student> students) {this.students = students;}}

 

hibernate.cfg.xml ，ORMappingTest  和之前的一样