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

package nju.seec.helper.data.dao;

import nju.seec.helper.data.entity.Comment;
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.stereotype.Repository;

/**
 * @author cst
 */
@Repository
public interface CommentDAO extends JpaRepository<Comment, Integer> {
    /**
     * 封装findById
     *
     * @param commentId
     * @return
     */
    default Comment findCommentById(Integer commentId) {
        return findById(commentId).orElseThrow(() -> HelperException.of(HelperException.ExceptionType.NOT_FOUND, "找不到评论"));
    }

    /**
     * 根据Item ID查询
     *
     * @param itemId
     * @param pageable
     * @return
     */
    Page<Comment> findByItemId(Integer itemId, Pageable pageable);
}