练习删除

xiangpei

2024-05-10 f0cbe681cb28df22952fb8a6420424a7385ac9db

 src/main/resources/mapper/QuestionSubjectMapper.xml

@@ -43,4 +43,25 @@
        </foreach>
    </insert>

</mapper>
    <delete id="removeSubjectId" parameterType="java.lang.Integer">
        delete from t_question_subject
        where subject_id = #{subjectId}
    </delete>

    <select id="getSubject" resultMap="BaseResultMap">
        select qs.*,s.name as subName
        from t_question_subject qs
                 left join t_subject s on qs.subject_id = s.id
        where subject_id = #{id} and qs.deleted = 0 and s.deleted = 0
    </select>

    <select id="countQuestionNum" resultType="integer">
        SELECT
               count(distinct id)
        FROM
             t_question_subject
        WHERE
              subject_id IN <foreach collection="subjects" open="(" separator="," close=")" item="subjectId">#{subjectId}</foreach>
    </select>

</mapper>