Hibernate4映射之三: many2many双向映射（注解方式）

最新推荐文章于 2017-02-09 16:48:29 发布

今天是昨天的明天

最新推荐文章于 2017-02-09 16:48:29 发布

阅读量443

点赞数

CC 4.0 BY-SA版权

分类专栏： hibernate 文章标签： hibernate Hibernate

本文链接：https://blog.youkuaiyun.com/cjj3930337/article/details/8301744

hibernate 专栏收录该内容

23 篇文章

订阅专栏

本文介绍了一个简单的Java实体类设计案例，通过使用JPA注解实现学生与教师之间的多对多关联关系。文章详细展示了如何定义实体类，并通过双向关联的方式确保数据的一致性。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

@Entity
@Table(name = "t_student")
public class Student {
	private int id;
	private String name;
	private Set<Teacher> teachers;

	@Id
	@GeneratedValue
	public int getId() {
		return id;
	}

	public String getName() {
		return name;
	}

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

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

	@ManyToMany(mappedBy="students")
	public Set<Teacher> getTeachers() {
		return teachers;
	}

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

@Entity
@Table(name = "t_teacher")
public class Teacher {
	private int id;
	private String name;
	private Set<Student> students;

	@Id
	@GeneratedValue
	public int getId() {
		return id;
	}

	public String getName() {
		return name;
	}

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

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

	@ManyToMany
	@JoinTable(name = "t_teacher_student", 
			   joinColumns = @JoinColumn(name = "teacher_id"), 
			   inverseJoinColumns = @JoinColumn(name = "student_id"))
	public Set<Student> getStudents() {
		return students;
	}

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