98 lines
3.5 KiB
MySQL
98 lines
3.5 KiB
MySQL
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-- 修复课件时长问题
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-- 问题：课件duration字段为0或NULL，导致学习进度计算不准确
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-- 解决：根据实际视频文件更新时长，或手动设置合理的时长
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-- 1. 查看当前课件时长情况
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SELECT
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id,
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courseware_name AS 课件名称,
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type AS 类型,
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duration AS 当前时长秒,
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CASE
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WHEN duration IS NULL OR duration = 0 THEN '❌ 需要修复'
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ELSE '✅ 正常'
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END AS 状态,
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file_path AS 文件路径
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FROM study_courseware
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WHERE course_id = 1 -- 修改为你要检查的课程ID
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ORDER BY courseware_order;
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-- 2. 手动更新课件时长（根据实际视频时长）
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-- 示例：假设你的视频实际时长如下
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-- 更新课件ID=883的时长为60秒（请根据实际情况修改）
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UPDATE study_courseware SET duration = 60 WHERE id = 883;
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-- 更新课件ID=884的时长为120秒
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UPDATE study_courseware SET duration = 120 WHERE id = 884;
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-- 更新课件ID=885的时长为90秒
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UPDATE study_courseware SET duration = 90 WHERE id = 885;
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-- 更新课件ID=886的时长为150秒
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UPDATE study_courseware SET duration = 150 WHERE id = 886;
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-- 更新课件ID=887的时长为180秒
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UPDATE study_courseware SET duration = 180 WHERE id = 887;
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-- 3. 批量更新：为所有duration为0或NULL的视频课件设置默认时长（60秒）
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-- ⚠️ 慎用！建议先查看具体视频再设置准确时长
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-- UPDATE study_courseware
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-- SET duration = 60
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-- WHERE type = 'video'
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-- AND (duration IS NULL OR duration = 0);
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-- 4. 验证更新结果
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SELECT
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id,
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courseware_name AS 课件名称,
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duration AS 时长秒,
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ROUND(duration / 60, 2) AS 时长分钟,
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file_path AS 文件路径
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FROM study_courseware
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WHERE course_id = 1 -- 修改为你的课程ID
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AND type = 'video'
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ORDER BY courseware_order;
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-- 5. 重新计算学习进度（更新课件时长后，需要触发进度重算）
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-- 方法A: 删除学习记录，让用户重新学习时自动计算
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-- DELETE FROM study_learning_record WHERE student_id = 452 AND course_id = 1;
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-- 方法B: 保留学习记录，手动更新进度为0，下次学习时会重新计算
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-- UPDATE study_learning_record
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-- SET progress = 0
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-- WHERE student_id = 452 AND course_id = 1;
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-- 6. 查看学习详情，检查是否有异常数据
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SELECT
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sld.id,
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sld.courseware_id AS 课件ID,
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sc.courseware_name AS 课件名称,
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sc.duration AS 课件时长秒,
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sld.video_position AS 播放位置秒,
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CASE
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WHEN sc.duration > 0 THEN ROUND(sld.video_position * 100.0 / sc.duration, 2)
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ELSE NULL
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END AS 播放进度百分比,
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CASE
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WHEN sld.video_position >= sc.duration * 0.9 THEN '✅ 已完成'
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WHEN sld.video_position == (
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SELECT MAX(video_position)
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FROM study_learning_detail
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WHERE courseware_id = sld.courseware_id
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AND student_id = sld.student_id
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) AND sld.video_position >= 3 THEN '✅ 已完成（到达最远位置）'
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ELSE '⏸️ 未完成'
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END AS 完成状态
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FROM study_learning_detail sld
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LEFT JOIN study_courseware sc ON sld.courseware_id = sc.id
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WHERE sld.student_id = 452 -- 修改为你的学生ID
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AND sld.course_id = 1 -- 修改为你的课程ID
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ORDER BY sld.courseware_id, sld.video_position DESC;
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-- 注意事项：
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-- 1. 执行UPDATE语句前，请务必先备份数据库
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-- 2. 根据实际视频时长设置duration值（单位：秒）
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-- 3. 更新后，下次学习时系统会自动重新计算进度
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-- 4. 可以在APP中重新进入课程，触发进度重新计算
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