EJB manytomany

最新推荐文章于 2022-11-01 16:51:29 发布

spoony_peng

最新推荐文章于 2022-11-01 16:51:29 发布

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CC 4.0 BY-SA版权

文章标签： ejb

本文链接：https://blog.youkuaiyun.com/spoony_peng/article/details/84357282

本文介绍了一种使用Java实现教师与学生多对多关联的方法。通过@Entity注解定义了Teacher和Student两个实体类，并利用@ManyToMany注解及@JoinTable配置中间表来维护双方的关系。

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@Entity @Table(name="teacher")
public class Teacher {
private Integer id;
private String name;
private Set<Student> students = new HashSet<Student>();
@ManyToMany
@JoinTable(name="mid",inverseJoinColumns=@JoinColumn(name="studentid"),joinColumns=@JoinColumn(name="teacherid"))
public Set<Student> getStudents() {
return students;
}

public void setStudents(Set<Student> students) {
this.students = students;
}
@Id @GeneratedValue
public Integer getId() {
return id;
}

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

public String getName() {
return name;
}

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

}

@Entity @Table(name="student")
public class Student {
private Integer id;
private String name;
private Set<Teacher> teachers = new HashSet<Teacher>();
@Id @GeneratedValue
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}
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;
}

}