tonytech/kindergarten_java
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fix: 课程包统计逻辑修正

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1. CoursePackageMapper: 新增 decrementUsageCount 方法
   - 课程取消时减少使用次数

2. LessonServiceImpl: 完善课程状态变更时的统计
   - cancelLesson: 取消时 usage_count -1
   - startLesson: 设置 startDatetime
   - completeLesson: 完成时设置 endDatetime

统计口径：
- usage_count: status != 'cancelled' 的课程数（创建时 +1，取消时 -1）
- teacher_count: status = 'completed' 的课程中去重教师数
This commit is contained in:
En 2026-03-20 14:36:12 +08:00
parent 161e05dce4
commit 4ec61e48ca
2 changed files with 15 additions and 0 deletions
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7
reading-platform-java/src/main/java/com/reading/platform/mapper/CoursePackageMapper.java
View File

@ -16,6 +16,13 @@ public interface CoursePackageMapper extends BaseMapper<CoursePackage> {
@Update("UPDATE course_package SET usage_count = usage_count + 1 WHERE id = #{coursePackageId}")
void incrementUsageCount(@Param("coursePackageId") Long coursePackageId);
/**
* 减少课程包使用次数（课程取消时调用）
* @param coursePackageId 课程包 ID
*/
@Update("UPDATE course_package SET usage_count = GREATEST(usage_count - 1, 0) WHERE id = #{coursePackageId}")
void decrementUsageCount(@Param("coursePackageId") Long coursePackageId);
/**
* 更新课程包教师数量（去重统计已完成课程的教师）
* @param coursePackageId 课程包 ID

8
reading-platform-java/src/main/java/com/reading/platform/service/impl/LessonServiceImpl.java
View File

@ -174,6 +174,7 @@ public class LessonServiceImpl extends ServiceImpl<LessonMapper, Lesson>
public void startLesson(Long id) {
Lesson lesson = getLessonById(id);
lesson.setStatus(LessonStatus.IN_PROGRESS.getCode());
lesson.setStartDatetime(LocalDateTime.now());
lessonMapper.updateById(lesson);
log.info("课程开始：id={}", id);
}
@ -183,6 +184,7 @@ public class LessonServiceImpl extends ServiceImpl<LessonMapper, Lesson>
public void completeLesson(Long id) {
Lesson lesson = getLessonById(id);
lesson.setStatus(LessonStatus.COMPLETED.getCode());
lesson.setEndDatetime(LocalDateTime.now());
lessonMapper.updateById(lesson);
log.info("课程完成：id={}", id);
@ -200,6 +202,12 @@ public class LessonServiceImpl extends ServiceImpl<LessonMapper, Lesson>
lesson.setStatus(LessonStatus.CANCELLED.getCode());
lessonMapper.updateById(lesson);
log.info("课程取消：id={}", id);
// 更新课程包统计：使用次数 -1（取消的课程不计入使用）
if (lesson.getCourseId() != null) {
coursePackageMapper.decrementUsageCount(lesson.getCourseId());
log.info("课程包使用次数 -1: courseId={}", lesson.getCourseId());
}
}
@Override