Question

我有一个名为StudentLesson的表，带有一个主复合键StudentLessonPk，该表由Student_id和Lesson_id组成。我想通过id获得学生课程，但是我当然不能将对象传递给path变量。我对JPA春季课程非常陌生，非常感谢您的帮助。我的代码供参考：

    @Embeddable
    public class StudentLessonPK implements Serializable{

    private static final long serialVersionUID = 5611658036387185008L;

    @Column(name = "Student_Id")
    private String Student_Id;

    @Column(name = "Lesson_Id")
    private String Lesson_Id;


    //GETTERS AND SETTERS
    public String getStudent_Id() {
        return Student_Id;
    }

    public void setStudent_Id(String student_Id) {
        Student_Id = student_Id;
    }

    public String getLesson_Id() {
        return Lesson_Id;
    }

    public void setLesson_Id(String lesson_Id) {
        Lesson_Id = lesson_Id;
    }
    //CONSTRUCTOR
    public StudentLessonPK(String student_Id, String lesson_Id) {
        super();
        Student_Id = student_Id;
        Lesson_Id = lesson_Id;
    }

    public StudentLessonPK(){

    }


}

我在控制器中的获取请求不正确：我想实现类似/ studentslesson / {studentid} / {lessonid}的功能

@RequestMapping(value="/studentslesson/{StudentLessonPK}", method = RequestMethod.GET)
    public StudentLesson StudentLessonById(@PathVariable StudentLessonPK id) {
        return StudentLessonService.getStudentLesson(id);
    }

我的学生课程服务课程：

public StudentLesson getStudentLesson(StudentLessonPK id) {
        Optional<StudentLesson> optionalStudentLesson = studentLessonRepository.findById(id);
        if(optionalStudentLesson.isPresent()) {
            return optionalStudentLesson.get();
        }
        return null;
    }

我的存储库：

    public interface StudentLessonRepository extends CrudRepository<StudentLesson, StudentLessonPK> {
}

Answer 1

在您的控制器中，您可以将StudentId和lessonId定义为两个不同的路径参数，从这两个参数构造一个StudentLessonPK对象，然后将其传递给StudentLessonService。

@RequestMapping(value="/studentslesson/{studentId}/{lessonId}", method = RequestMethod.GET)
public StudentLesson StudentLessonById(@PathVariable String studentId, @PathVariable String lessonId) {
    StudentLessonPK id = new StudentLessonPK(studentId, lessonId);
    return StudentLessonService.getStudentLesson(id);
}

Spring MVC获取请求组合键

1 个答案: