backend/src/main/java/nju/seec/helper/dao/SlideDAO.java

package nju.seec.helper.dao;

import nju.seec.helper.entity.Slide;
import nju.seec.helper.util.enums.ExceptionType;
import nju.seec.helper.util.enums.SlideState;
import nju.seec.helper.util.exception.HelperException;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import java.util.Set;

/**
 * @author cst
 */
@Repository
public interface SlideDAO extends JpaRepository<Slide, Long> {
    /**
     * 封装findById
     *
     * @param id
     * @return
     */
    default Slide findSlideById(Long id) {
        return this.findById(id)
                .filter(slide -> slide.getDeleteAt() == 0)
                .orElseThrow(() -> HelperException.of(ExceptionType.NOT_FOUND, "找不到课件"));
    }

    /**
     * 查询教师创建的课件
     *
     * @param teacherId
     * @param key
     * @param pageable
     * @return
     */
    @Query("select s from Slide s " +
            "where s.teacherId=?1 " +
            "and s.name like concat('%',?2,'%') " +
            "and s.deleteAt=0")
    Page<Slide> findByTeacherIdAndNameContains(Long teacherId, String key, Pageable pageable);

    /**
     * 查询教师创建的该课程的课件
     *
     * @param courseId
     * @param teacherId
     * @param key
     * @param pageable
     * @return
     */
    @Query("select s from Slide s " +
            "where s.courseId=?1 " +
            "and s.teacherId=?2 " +
            "and s.name like concat('%',?3,'%') " +
            "and s.deleteAt=0")
    Page<Slide> findByCourseIdAndTeacherIdAndNameContains(Long courseId, Long teacherId, String key, Pageable pageable);

    /**
     * 根据课程和课件状态查询
     *
     * @param courseId
     * @param exclusiveStates
     * @param key
     * @param pageable
     * @return
     */
    @Query("select s from Slide s " +
            "where s.courseId=?1 " +
            "and s.state not in ?2 " +
            "and s.name like concat('%',?3,'%') " +
            "and s.deleteAt=0")
    Page<Slide> findByCourseIdAndStateNotInAndNameContains(Long courseId, Set<SlideState> exclusiveStates, String key, Pageable pageable);

    /**
     * 更新所有人信息
     *
     * @param userId
     * @param userName
     */
    @Transactional(rollbackFor = Exception.class)
    @Modifying
    @Query("update Slide s " +
            "set s.teacherName=?2 " +
            "where s.teacherId=?1 ")
    void updateUser(Long userId, String userName);

    /**
     * 更新课程信息
     *
     * @param courseId
     * @param courseName
     */
    @Transactional(rollbackFor = Exception.class)
    @Modifying
    @Query("update Slide s " +
            "set s.courseName=?2 " +
            "where s.courseId=?1 ")
    void updateCourse(Long courseId, String courseName);

    /**
     * 检查同名课件
     *
     * @param slideId
     * @param courseId
     * @param name
     * @return
     */
    @Query("select case when count(s.id)>0 then true else false end " +
            "from Slide s " +
            "where s.id<>?1 " +
            "and s.courseId=?2 " +
            "and s.name=?3 " +
            "and s.deleteAt=0 ")
    boolean existsByCourseIdAndName(Long slideId, Long courseId, String name);
}