src/main/resources/mapper/ActivityMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.pt5.pthouduan.mapper.ActivityMapper">

    <!-- 插入活动 -->
    <insert id="insert" parameterType="com.pt5.pthouduan.entity.Activity"
            useGeneratedKeys="true" keyProperty="activityid" keyColumn="activityid">
        INSERT INTO activity (
            title,
            content,
            photo,
            time,
            is_show,
            award
        ) VALUES (
                     #{title},
                     #{content},
                     #{photo},
                     #{time},
                     #{is_show},
                     #{award}
                 )
    </insert>

    <!-- 删除活动 -->
    <delete id="deleteById" parameterType="int">
        DELETE FROM activity WHERE activityid = #{activityid}
    </delete>

    <!-- 更新活动 -->
    <update id="updateById" parameterType="com.pt5.pthouduan.entity.Activity">
        UPDATE activity
        SET
            title = #{title},
            content = #{content},
            photo = #{photo},
            time = #{time},
            is_show = #{is_show},
            award = #{award}
        WHERE activityid = #{activityid}
    </update>

    <!-- 查询所有 is_show 为指定值的活动 -->
    <select id="selectByIsShow" resultType="com.pt5.pthouduan.entity.Activity">
        SELECT *
        FROM activity
        WHERE is_show = #{is_show}
        ORDER BY time DESC
    </select>

    <!-- ✅ 新增：根据活动ID查询活动详情 -->
    <select id="selectById" parameterType="int" resultType="com.pt5.pthouduan.entity.Activity">
        SELECT *
        FROM activity
        WHERE activityid = #{activityid}
    </select>

</mapper>