213 lines
11 KiB
Python
213 lines
11 KiB
Python
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from model.statistics_model import StudentInfo, StudentScore, ClassInfo, EmploymentInfo
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from datetime import date
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from dateutil.relativedelta import relativedelta
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from sqlalchemy import func # SQL 内置函数生成器（MIN/MAX/COUNT 等）
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class StatisticsDao:
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@staticmethod
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def get_students_by_age_range_dao(n:int,m:int,min_age: int, max_age: int,db):
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# 年龄 → 出生日期区间（数据库存 birthday，没有 age 字段）
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today = date.today()
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earliest_birthday = today - relativedelta(years=max_age) # 最大年龄 → 最早出生
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latest_birthday = today - relativedelta(years=min_age) # 最小年龄 → 最晚出生
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try:
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q = db.query(StudentInfo).\
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filter(StudentInfo.is_deleted == '0').\
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filter(StudentInfo.birthday >= earliest_birthday).\
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filter(StudentInfo.birthday <= latest_birthday)
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total = q.count() # 总条数
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req = q.offset((n - 1) * m).limit(m).all() # 分页
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except Exception as e:
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db.rollback()
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raise e
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else:
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return req,total
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@staticmethod
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def get_students_by_class_id_dao(class_id:str,db):
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try:
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q = db.query(StudentInfo).filter(StudentInfo.class_id == class_id).\
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filter(StudentInfo.is_deleted == '0')
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total_count = q.count() # 总人数
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male_count = q.filter(StudentInfo.gender == '男').count()
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female_count = q.filter(StudentInfo.gender == '女').count()
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except Exception as e:
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db.rollback()
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raise e
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else:
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return total_count, male_count , female_count
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@staticmethod
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def get_students_by_score_dao(n:int,m:int,score:float,db):
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# GROUP BY 每个学生一行，HAVING MIN(score) > 阈值 → 所有成绩都过线
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# SELECT MIN(score) AS score → 返回该学生最低分（schema StudentInfo2 对应字段）
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try:
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q = (db.query(
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StudentInfo.student_name,
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StudentInfo.student_id,
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func.min(StudentScore.score).label('score') # 起别名，后面 i.score 访问
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).join(StudentScore, StudentInfo.student_id == StudentScore.student_id)
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.filter(StudentInfo.is_deleted == '0') # 逻辑删除：学生表
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.filter(StudentScore.is_deleted == '0') # 逻辑删除：成绩表
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.group_by(StudentInfo.student_id, StudentInfo.student_name) # only_full_group_by 要求
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.having(func.min(StudentScore.score) > score)) # 组最低分 > 阈值 = 全过线
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total = q.count()
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req = q.offset((n - 1) * m).limit(m).all()
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except Exception as e:
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db.rollback()
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raise e
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else:
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# Row 对象手动转字典，字段对齐 schema StudentInfo2
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return [{"student_name":i.student_name,
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'student_id':i.student_id,
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"score":i.score} for i in req],total
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@staticmethod
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def get_student_by_no_pass_dao(n:int,m:int,fail_count:int,db):
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try:
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q = (db.query(
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StudentInfo.student_id,
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StudentInfo.student_name,
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func.count(StudentScore.score_id).label('fail_count')
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).join(StudentScore, StudentInfo.student_id == StudentScore.student_id)
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.filter(StudentInfo.is_deleted == '0')
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.filter(StudentScore.is_deleted == '0')
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.filter(StudentScore.is_pass == '0')
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.group_by(StudentInfo.student_id, StudentInfo.student_name)
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.having(func.count(StudentScore.score_id) >= fail_count))
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total = q.count()
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req = q.offset((n - 1) * m).limit(m).all()
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except Exception as e:
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db.rollback()
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raise e
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else:
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return [{"student_id": i.student_id,
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"student_name": i.student_name,
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"fail_count": i.fail_count} for i in req], total
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@staticmethod
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def get_class_exam_avg_score_dao(n:int,m:int,db):
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# 统计每次考试每个班级的平均分，按平均分从高到低排序
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# 三表联查：student_score →(student_id)→ student_info →(class_id)→ class_info
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# 分组维度：exam_type + exam_date + course_id + class_id（一场考试×一个班级）
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# 聚合：AVG(score) 排序：DESC
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try:
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q = (db.query(
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StudentScore.course_id, # 课程编号（不同科目）
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StudentInfo.class_id, # 班级编号，来自学生表
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ClassInfo.class_name, # 班级名称，来自班级表
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func.avg(func.ifnull(StudentScore.score, 0)).label('avg_score') # 每个学生缺考分按0算，再求班级平均分
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).join(StudentInfo, StudentScore.student_id == StudentInfo.student_id) # 成绩→学生：取 class_id
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.join(ClassInfo, StudentInfo.class_id == ClassInfo.class_id) # 学生→班级：取 class_name
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.filter(StudentInfo.is_deleted == '0') # 过滤已删除学生
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.filter(StudentScore.is_deleted == '0') # 过滤已删除成绩
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.filter(ClassInfo.is_deleted == '0') # 过滤已停用班级
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.group_by(StudentScore.course_id,
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StudentInfo.class_id, # 每个班级单独成组
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ClassInfo.class_name) # MySQL only_full_group_by 要求
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.order_by(func.avg(func.ifnull(StudentScore.score,0)).desc())) # 平均分降序（从高到低）
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total = q.count() # 分组后的总组合数
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req = q.offset((n - 1) * m).limit(m).all() # 分页：从 (n-1)*m 开始取 m 条
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except Exception as e:
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db.rollback()
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raise e
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else:
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# Row 对象转 dict，avg_score 保留两位小数对齐前端展示
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return [{"course_id": i.course_id,
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"class_id": i.class_id,
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"class_name": i.class_name,
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"avg_score": round(float(i.avg_score), 2)} for i in req], total
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@staticmethod
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def get_salary_top_dao(m:int,db): # 统计就业薪资最高的前五名学生的姓名，班级和就业时间，就业公司
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try:
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# 子查询：获取每个学生的最高薪资
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sq = (db.query(
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EmploymentInfo.student_id,
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func.max(EmploymentInfo.salary).label('max_salary')
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).filter(EmploymentInfo.is_deleted == '0')
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.group_by(EmploymentInfo.student_id)
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.order_by(func.max(EmploymentInfo.salary).desc())
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.limit(m)
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.subquery())
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# 主查询：关联学生表、班级表和就业信息表
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q = (db.query(
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StudentInfo.student_name,
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ClassInfo.class_name,
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EmploymentInfo.part_time,
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EmploymentInfo.company_name,
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EmploymentInfo.salary
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).join(EmploymentInfo, StudentInfo.student_id == EmploymentInfo.student_id)
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.join(ClassInfo, StudentInfo.class_id == ClassInfo.class_id)
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.join(sq,
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(EmploymentInfo.student_id == sq.c.student_id) &
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(EmploymentInfo.salary == sq.c.max_salary))
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.filter(StudentInfo.is_deleted == '0')
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.filter(ClassInfo.is_deleted == '0')
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.filter(EmploymentInfo.is_deleted == '0'))
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req = q.all()
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except Exception as e:
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db.rollback()
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raise e
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else:
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return [{"student_name": i.student_name,
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"class_name": i.class_name,
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"part_time": i.part_time,
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"company_name": i.company_name,
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"salary": i.salary} for i in req]
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@staticmethod
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def get_time_size_dao(n:int,m:int,db): # 统计每个学生的就业时长(offer下发时间-就业开放时间)
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try:
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# 查询学生姓名、就业信息，并计算就业时长（天数）
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q = (db.query(
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StudentInfo.student_id,
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StudentInfo.student_name,
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EmploymentInfo.offer_date,
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EmploymentInfo.resume_open_date,
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func.datediff(EmploymentInfo.offer_date, EmploymentInfo.resume_open_date).label('time_size')
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).join(EmploymentInfo, StudentInfo.student_id == EmploymentInfo.student_id)
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.filter(StudentInfo.is_deleted == '0')
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.filter(EmploymentInfo.is_deleted == '0')
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.filter(EmploymentInfo.resume_open_date.isnot(None))) # 确保开放简历时间不为空
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total = q.count()
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req = q.offset((n - 1) * m).limit(m).all()
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except Exception as e:
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db.rollback()
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raise e
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else:
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return [{"student_id": i.student_id,
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"student_name": i.student_name,
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"offer_date": i.offer_date,
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"resume_open_date": i.resume_open_date,
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"time_size": i.time_size} for i in req], total
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@staticmethod
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def get_class_avg_time_size_dao(n:int,m:int,db):
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# 统计每个班级的平均就业时长(只统计进入就业阶段的学生)
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try:
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# 查询班级名称和平均就业时长
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q = (db.query(
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ClassInfo.class_id,
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ClassInfo.class_name,
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func.avg(func.datediff(EmploymentInfo.offer_date, EmploymentInfo.resume_open_date)).label('avg_time_size')
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).join(StudentInfo, ClassInfo.class_id == StudentInfo.class_id)
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.join(EmploymentInfo, StudentInfo.student_id == EmploymentInfo.student_id)
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.filter(ClassInfo.is_deleted == '0')
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.filter(StudentInfo.is_deleted == '0')
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.filter(EmploymentInfo.is_deleted == '0')
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.filter(EmploymentInfo.resume_open_date.isnot(None)) # 只统计有就业开放时间的学生
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.group_by(ClassInfo.class_id, ClassInfo.class_name))
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total = q.count()
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req = q.offset((n - 1) * m).limit(m).all()
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except Exception as e:
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db.rollback()
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raise e
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else:
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return [{"class_id": i.class_id,
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"class_name": i.class_name,
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"avg_time_size": round(float(i.avg_time_size), 2)} for i in req], total
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