backend/src/main/java/nju/seec/helper/data/dao/CourseDAO.java

package nju.seec.helper.data.dao;

import nju.seec.helper.data.entity.Course;
import nju.seec.helper.util.exception.HelperException;
import org.springframework.data.domain.Page;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

/**
 * @author cst
 */
@Repository
public interface CourseDAO extends JpaRepository<Course, String> {
    /**
     * 封装findById方法
     *
     * @param courseId
     * @return
     */
    default Course findCourseById(String courseId) {
        return this.findById(courseId).orElseThrow(() -> HelperException.of(HelperException.ExceptionType.NOT_FOUND, "找不到课程"));
    }
}