Hibernate关系映射(10)_多对多单向关联

Hibernate多对多关系映射

最新推荐文章于 2025-07-28 23:27:29 发布

原创最新推荐文章于 2025-07-28 23:27:29 发布 · 707 阅读

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#hibernate #string #generator #class #table

本文介绍如何使用Hibernate框架通过Annotation和XML两种方式实现Teacher与Student多对多关系的映射，包括实体类定义及映射文件配置。

一.Annotation方式：

Teacher与Student是多对多的关系。在Teacher持有Student的引用

/* * Teacher.java */ @Entity public class Teacher { private int id; private String name; private Set<Student> students = new HashSet<Student>(); @ManyToMany @JoinTable(name="t_s", joinColumns=@JoinColumn(name="teacher_id"), //指向teacher表的id inverseJoinColumns=@JoinColumn(name="student_id") //指向student表的id ) public Set<Student> getStudents() { return students; } public void setStudents(Set<Student> students) { this.students = students; } @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; } }

/* * Student.java */ @Entity public class Student { 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; } }

二.XML方式：(以上程序去掉注解)

在Teacher.hbm.xml中配置映射关系：

<hibernate-mapping> <class name="com.szy.hibernate.model.Teacher"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <set name="students" table="t_s"> <key column="teacher_id"></key> <many-to-many class="com.szy.hibernate.model.Student" column="student_id"/> </set> </class> </hibernate-mapping>

在Student.hbm.xml中配置映射关系：

<hibernate-mapping> <class name="com.szy.hibernate.model.Student"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> </class> </hibernate-mapping>