dao/sj_dao.py

@@ -0,0 +1,123 @@
+from sqlalchemy import func, desc
+from sqlalchemy.exc import SQLAlchemyError
+from model.Employment import Employment
+from fastapi import HTTPException
+from model.Students import Student
+from model.Score import Scores
+
+# ① 超30岁学员
+def fun1(db):
+    try:
+        rows = db.query(Student).filter(Student.age>30).all()
+        return [{'id': i.stu_id, 'name': i.name} for i in rows]
+    except SQLAlchemyError as e:
+        db.rollback()
+        raise HTTPException(status_code=400,detail=f'查询超三十岁学员信息失败:{str(e)}')
+
+# ② 各班人数 + 男女比
+def fun2(db):
+    try:
+        rows = db.query(
+            Student.stu_class,
+            Student.gender,
+            func.count(1).label('num')
+        ).group_by(Student.stu_class, Student.gender).all()
+        return [{'班级': r.stu_class, '性别': r.gender, '人数':r.num } for r in rows]
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=400,detail=f'查询各班人数与男女比例失败:{str(e)}')
+
+# ③ 每次考试都≥80分的学生
+def fun3(db):
+    try:
+        print('1111111111-----')
+        rows = db.query(
+            Scores.stu_id,
+            Student.name,
+            func.min(Scores.score).label('min_score')
+        ).join(Student, Student.stu_id == Scores.stu_id) \
+         .group_by(Scores.stu_id, Student.name) \
+         .having(func.min(Scores.score) >= 80).all()
+        t = ['stu_id', 'name', 'min_score']
+        l = [dict(zip(t, row)) for row in rows]
+        return  l
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=400,detail=f'查询成绩大于80的学生失败:{str(e)}')
+
+# ④ 两次以上不及格的学生
+def fun4(db):
+    try:
+        rows = db.query(
+            Student.name,
+            Student.stu_class,
+        ).join(Scores, Scores.stu_id == Student.stu_id) \
+         .filter(Scores.score < 60) \
+         .group_by(Scores.stu_id,Student.name,Student.stu_class) \
+         .having(func.count(Scores.id) >= 2).all()
+        t = ['name', 'stu_class']
+        l = [dict(zip(t, row)) for row in rows]
+        return l
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=400,detail=f'查询两次不及格的学生失败:{str(e)}')
+
+# ⑤ 每次考试各班平均分（降序）
+def fun5(db):
+    try:
+        print('5555555555')
+        rows = db.query(
+            Scores.exam_seq,
+            Student.stu_class,
+            func.avg(Scores.score).label('avg_score')
+        ).join(Student, Student.stu_id == Scores.stu_id) \
+         .group_by(Scores.exam_seq, Student.stu_class) \
+         .order_by(desc('avg_score')).all()
+        t = ['exam_seq', 'stu_class','avg_score']
+        l = [dict(zip(t, row)) for row in rows]
+        return l
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=400, detail=f'查询各班平均分失败:{str(e)}')
+
+# ⑥ 薪资前五名
+def fun6(db):
+    try:
+        rows = db.query(Student.name, Student.stu_class,Employment.work_date,Employment.company,Employment.salary).join(Student, Student.stu_id == Employment.s_id).order_by(Employment.salary).limit(5).all()
+        t = ['s_name','stu_class','work_date','company','salary']
+        l = [dict(zip(t, row)) for row in rows]
+        print(l)
+        return {'code': 200, 'data': l}
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=400,detail=f'查询薪资前五名失败失败:{str(e)}')
+
+# ⑦ 每个学生就业时长
+def fun7(db):
+    try:
+        rows = db.query(Employment.s_id,func.datediff(Employment.offer_date,Employment.open_date).label('offer_s')).group_by(Employment.s_id,Employment.offer_date,Employment.open_date).all()
+        t = ['s_id', 'offer_s']
+        l = [dict(zip(t, row)) for row in rows]
+        return {'code': 200, 'data': l}
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=400,detail=f'查询每个学生的就业时长失败:{str(e)}')
+
+# ⑧ 各班平均就业时长
+def fun8(db):
+    try:
+        rows = db.query(
+            Student.stu_class,
+          func.avg(func.datediff(Employment.offer_date, Employment.open_date)).label('avg_duration')
+        ).join(Student, Student.stu_id == Employment.s_id).filter(
+            Employment.open_date.isnot(None)
+        ).group_by(Student.stu_class).all()
+        t = ['stu_class', 'avg_duration']
+        l = [dict(zip(t, row)) for row in rows]
+        return l
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=400,detail=f'查询各班平均就业时长失败:{str(e)}')
+
+
+