Files
campus-activity-system/server/target/classes/mapper/CheckInMapper.xml

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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.campus.activity.mapper.CheckInMapper">
<select id="selectActivityCheckIns" resultType="com.campus.activity.vo.CheckInVO">
SELECT c.id,
c.user_id as userId,
c.activity_id as activityId,
c.check_in_time as checkInTime,
c.check_in_method as checkInMethod,
u.name as userName,
u.student_id as studentId
FROM check_in c
LEFT JOIN user u ON c.user_id = u.id
WHERE c.activity_id = #{activityId}
ORDER BY c.check_in_time ASC
</select>
</mapper>