Merge pull request '完善统计模块及模型' (#22) from 张昕浩 into main

Reviewed-on: #22

dao/statistics.py

@@ -1,6 +1,6 @@
-from DoubaoTeam.schemas.statistics import NoExist
+from schemas.statistics import NoExist
 from sqlalchemy import func
-
+from time import time
 #`GET /statistics/students/age-over-30`
 #查询所有超过 30 岁的学员信息
 
@@ -23,8 +23,58 @@ def gender_count(Student,db):
 #查询每次考试成绩都在 80 分以上的学生编号、姓名和成绩
 def score_over_eighty(Score,Student,db):
     student_list=db.query(Student.id, Student.student_name)\
-                  .join(Student,Score.student_id==Student.id).group_by(Student.student_no,Student.student_name)\
+                  .join(Score,Score.student_id==Student.id).group_by(Student.student_no,Student.student_name)\
                   .having(func.min(Score.score)>80).all()
+    if not student_list :
+        raise NoExist('全是学渣')
+    list1 = []
     for i in student_list:
-        student_list2 = db.query(Student.student_no, Student.student_name,Score.score).join(Student,Score.student_id==Student.id).filter(i.id==Student.id).all()
+        student_list2 = db.query(Student.student_no, Student.student_name,Score.score).join(Score,Score.student_id==Student.id).filter(i.id==Student.id).all()
+        if student_list2 :
+            list1.extend(student_list2)
+    return list1
+#查询有两次以上不及格的学生姓名、班级和不及格成绩
+def twice_error(Score,Student,db):
+    student_list=db.query(Score.student_id).filter(Score.score<60).group_by(Score.student_id).having(func.count(Score.id)>1).all()
+    if not student_list :
+        raise NoExist('全是学霸')
+    list1=[]
+    for i in student_list:
+        result=db.query(Student.student_name,Student.class_id,Score.score).join(Score, Student.id==Score.student_id)\
+        .filter(i.student_id==Score.student_id,Score.score<60).all()
+        list1.extend(result)
+    return list1
+
+#统计每次考试每个班级的平均分，并按照平均分从高到低排序
+def avg_class(Score,Student,db):
+    student_list = db.query(Student.class_id,Score.exam_seq,func.avg(Score.score)).join(Score, Student.id == Score.student_id).group_by(Student.class_id,Score.exam_seq).order_by(func.avg(Score.score).desc()).all()
+    if not student_list :
+        raise NoExist('招个人吧')
+    return student_list
+
+#统计就业薪资最高的前五名学生姓名、班级、就业时间、就业公司
+def max_salary(Student,Employment,db):
+    student_list = db.query(Student.student_name,Student.class_id,Employment.offer_date,Employment.company_name).join(Employment, Student.id == Employment.student_id).order_by(Employment.salary_max.desc()).limit(5).all()
+    if not student_list :
+        raise NoExist('没就业的啊兄弟？')
+    return student_list
+
+# - 统计每个学生的就业时长
+# - 就业时长 = `offer_date - employment_open_date`
+def student_market(Employment,db):
+    student_list = db.query(Employment.student_id,func.datediff(Employment.offer_date,Employment.employment_open_date)).all()
+    return student_list
+
+# - 统计每个班级的平均就业时长
+# - 只统计有就业开放时间的学生
+def avg_emptime(Employment,Student,db):
+    student_list = (db.query(Student.class_id,\
+                            func.avg(func.datediff(Employment.offer_date,Employment.employment_open_date)))\
+                    .join(Employment, Student.id==Employment.student_id).filter(Employment.employment_open_date.is_not(None)))\
+    .group_by(Student.class_id).all()
+    if not student_list :
+        raise NoExist('一个就业都没有吗')
+    return student_list
+
+