998211c483
- 从服务器拉取完整代码 - 按框架规范整理项目结构 - 配置 Drone CI 测试环境部署 - 包含后端(FastAPI)、前端(Vue3)、管理端 技术栈: Vue3 + TypeScript + FastAPI + MySQL
66 lines
1.9 KiB
Python
66 lines
1.9 KiB
Python
"""
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课程统计服务
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"""
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from sqlalchemy import select, func
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.models.exam import Exam
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from app.models.course import Course
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from app.core.logger import get_logger
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logger = get_logger(__name__)
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class CourseStatisticsService:
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"""课程统计服务类"""
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async def update_course_student_count(
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self,
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db: AsyncSession,
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course_id: int
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) -> int:
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"""
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更新课程学员数统计
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Args:
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db: 数据库会话
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course_id: 课程ID
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Returns:
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更新后的学员数
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"""
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try:
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# 统计该课程的不同学员数（基于考试记录）
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stmt = select(func.count(func.distinct(Exam.user_id))).where(
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Exam.course_id == course_id,
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Exam.is_deleted == False
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)
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result = await db.execute(stmt)
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student_count = result.scalar_one() or 0
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# 更新课程表
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course_stmt = select(Course).where(
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Course.id == course_id,
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Course.is_deleted == False
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)
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course_result = await db.execute(course_stmt)
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course = course_result.scalar_one_or_none()
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if course:
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course.student_count = student_count
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await db.commit()
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logger.info(f"更新课程 {course_id} 学员数: {student_count}")
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return student_count
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else:
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logger.warning(f"课程 {course_id} 不存在")
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return 0
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except Exception as e:
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logger.error(f"更新课程学员数失败: {str(e)}", exc_info=True)
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await db.rollback()
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raise
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# 创建全局实例
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course_statistics_service = CourseStatisticsService()
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