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student_system_final/dao/score_dao.py

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+# dao/score_dao.py
+# 本文件封装对学生成绩表的所有数据库操作（增、删、改、查）
+from fastapi import HTTPException
+from sqlalchemy import and_
+from sqlalchemy.orm import Session
+
+from model.student_score import Score
+from scheme.scores import ScoreCreate, ScoreUpdate
+
+
+class ScoreDAO:
+
+    # 根据学生id、考试次数查询有效成绩（flag=1）
+    @staticmethod
+    def get_by_id(db: Session, sid: int, exam_num: int):
+        score = db.query(Score).filter(and_(Score.sid == sid, Score.exam_num == exam_num, Score.flag == 1)
+        ).first()
+        if score:
+            return score
+        raise HTTPException(status_code=404, detail="学生分数不存在")
+
+    # 查询某个学生的所有考试成绩
+    @staticmethod
+    def get_by_student(db: Session, sid: int):
+        return (db.query(Score)
+                .filter(Score.sid == sid, Score.flag == 1).order_by(Score.exam_num).all())
+
+    # 录入成绩
+    @staticmethod
+    def create(db: Session, data: ScoreCreate):
+        # 同一个学生同一次考试只能有一条有效成绩
+        exist = db.query(Score).filter(and_(Score.sid == data.sid, Score.exam_num == data.exam_num, Score.flag == 1)).first()
+        if exist:
+            raise HTTPException(status_code=400,
+                                detail=f"学生 {data.sid} 第 {data.exam_num} 次成绩已存在，请使用修改接口")
+        score = Score(sid=data.sid, exam_num=data.exam_num, score=data.score, flag=1)
+        db.add(score)
+        db.commit()
+        db.refresh(score)
+        return score
+
+    # 根据学生id和考试次数更新成绩
+    @staticmethod
+    def update(db: Session, sid: int, exam_num: int, score_data: ScoreUpdate):
+        update_data = score_data.model_dump()
+        db.query(Score) \
+            .filter(Score.sid == sid) \
+            .update(update_data)
+        db.commit()          # 提交事务
+        return ScoreDAO.get_by_id(db, sid, exam_num)
+
+    # 根据学生id和考试次数逻辑删除（flag 改为 0）
+    @staticmethod
+    def delete(db: Session, sid: int, exam_num: int):
+        db_score = ScoreDAO.get_by_id(db, sid, exam_num)
+        db_score.flag = 0     # 标记为已删除
+        db.commit()
+        db.refresh(db_score)
+        return db_score