167 lines
5.8 KiB
Python
167 lines
5.8 KiB
Python
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from typing import Optional
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from sqlalchemy import and_, func, desc
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from model.classes import Class
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from model.student import Student
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from model.student_score import Score
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from model.work import Work
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class Statistic:
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def __init__(self,db):
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self.db = db
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def get_ages(self,age1:int,age2:Optional[int],condition:int):
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stu = self.db.query(Student)
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if not age2:
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if condition == 1:
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q=stu.filter(Student.age > age1).all()
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elif condition == 2:
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q=stu.filter(Student.age < age1).all()
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elif condition == 3:
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q=stu.filter(Student.age == age1).all()
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else:
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return f"输入错误，重新输入"
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else:
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if condition == 4:
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q=stu.filter(and_(Student.age > age1, Student.age < age2)).all()
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else:
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return f"输入错误，重新输入"
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return q
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def get_class(self):
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# 查询所有存在的班级cid（去重）
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cid_list = self.db.query(Student.cid).distinct().all()
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result = []
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for row in cid_list:
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cid = row.cid
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# 当前班级全部学生
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all_stu = self.db.query(Student).filter(Student.cid == cid).all()
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total = len(all_stu)
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if total == 0:
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continue
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# 男生
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man_list = [s for s in all_stu if s.gender == "男"]
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man_count = len(man_list)
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# 女生
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woman_list = [s for s in all_stu if s.gender == "女"]
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woman_count = len(woman_list)
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man_rate = man_count / total
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woman_rate = woman_count / total
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result.append({
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"class_id": cid,
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"total": total,
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"male_count": man_count,
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"male_rate": man_rate,
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"female_count": woman_count,
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"female_rate": woman_rate
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})
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return result
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def get_grades(self, grades):
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stu = self.db.query(Score).filter(Score.score > grades).distinct().all()
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result = []
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for st in stu:
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result.append({
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"sid": st.sid,
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"score": st.score
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})
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return result
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def get_bad_grades(self, number: int):
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# 第一步：统计每个学生不及格(<60)的记录数量，筛选出不及格次数 >= number 的学生sid
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sub_q = self.db.query(
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Score.sid,
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func.count(Score.score).label("bad_count")
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).filter(Score.score < 60) \
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.group_by(Score.sid) \
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.having(func.count(Score.score) >= number) \
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.subquery()
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# 第二步：关联学生表+子查询，拿到满足条件学生的全部不及格成绩明细
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bad_list = self.db.query(
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Student.name,
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Student.cid,
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Score.score,
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Score.exam_num
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).join(sub_q, Student.sid == sub_q.c.sid) \
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.join(Score, Student.sid == Score.sid) \
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.filter(Score.score < 60) \
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.all()
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# 组装结果：按学生分组，一个学生一条，里面放成绩明细
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result = {}
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for name, cid, score, exam_num in bad_list:
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key = (name, cid)
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if key not in result:
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result[key] = {
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"name": name,
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"cid": cid,
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"bad_detail": [],
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"bad_count": 0
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}
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result[key]["bad_detail"].append({"exam_num": exam_num, "score": score})
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result[key]["bad_count"] += 1
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return list(result.values())
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def get_avg_grades(self, sort: int):
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q = self.db.query(
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Class.cid,
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func.avg(Score.score).label("avg_score")
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).join(Student,
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Student.cid == Class.cid) \
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.join(Score, Score.sid == Student.sid) \
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.group_by(Class.cid)
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data = q.all()
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result = []
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for item in data:
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result.append({
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"班级": item.cid,
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"平均分": float(item.avg_score)
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})
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if sort == 1:
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result.sort(key=lambda x: x["平均分"], reverse=True)
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elif sort == 2:
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result.sort(key=lambda x: x["平均分"], reverse=False)
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else:
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return {"code": 400, "msg": "输入错误，sort只能填1或2"}
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return result
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# #
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def get_top(self,top):
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stu=self.db.query(Student.name.label("student_name"),
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Student.cid.label("class_id"),
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Work.offer_time,
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Work.company_name,
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Work.salary).join(Student,Student.sid==Work.sid)\
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.order_by(desc(Work.salary)).offset(top - 1).limit(1).first()
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if not stu:
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return f"错误排名"
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name,cid,time,cname,salary = stu
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return {"名字":name,"班级":cid,"就业时间":time,"公司名":cname,"薪水":salary}
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def get_time(self):
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result = []
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stu=self.db.query(Work.sid,
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Work.open_time,
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Work.offer_time).all()
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for item in stu:
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time=item.offer_time-item.open_time
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result.append({"学生id":item.sid,"就业时长":time})
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return result
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# def get_avg_time(self):
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# result = []
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# stu=Query(Class.id.label("class_id"),
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# func.datediff(Student_employment.offer_time, Student_employment.open_time).join(Student_employment,Student_employment.sid==Student.sid)\
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# .join(Student,Student.cid==Class.cid).group_by(Class.id).fillter().all()
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