学生管理系统代码

dao/advisor_dao.py

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+from sqlalchemy.orm import Session
+
+from model import Advisor, Student
+
+
+#查所有返回的是列表
+def get_all(db:Session):
+    return db.query(Advisor).filter(Advisor.flag==1).all()
+
+#查单个,first返回第一个数据，没有就返回None
+def get_by_id(db:Session,advisor_id:int):
+    return db.query(Advisor).filter(Advisor.id==advisor_id,Advisor.flag==1).first()
+
+#查指定顾问下的学生信息
+def   adv_all_stu(db:Session,advisor_id:int):
+    advisor= db.query(Advisor).filter(Advisor.id == advisor_id, Advisor.flag == 1).first()
+    if advisor is None:
+        return None
+    else:
+        students = db.query(Student).filter(Student.advisor_id == advisor_id, Student.flag == 1).all()
+        return students
+
+#增加顾问
+def create_advisor(db:Session,advisor_name:str,phone:str|None=None,gender=None):
+    advisor=Advisor(advisor_name=advisor_name,phone=phone,gender=gender,flag=1)
+    db.add(advisor)
+    db.commit()
+    db.refresh(advisor)
+    return advisor
+
+#删除或者恢复顾问状态 先查到没有被删除再删除
+def change_advisor(db:Session,advisor_id:int,flag:int):
+    advisor=db.query(Advisor).filter(Advisor.id==advisor_id).first()
+    if advisor:
+        advisor.flag=flag
+    else:
+        return None
+    db.commit()
+    return advisor
+
+#修改顾问信息
+def update_advisor(db:Session,advisor_id:int,advisor_name:str,phone:str|None=None,gender=None):
+    advisor = db.query(Advisor).filter(Advisor.id == advisor_id, Advisor.flag == 1).first()
+    if advisor :
+        advisor.advisor_name=advisor_name
+        # 没传的字段保持原值，不覆盖成 None
+        if phone is not None:
+            advisor.phone=phone
+        if gender is not None:
+            advisor.gender=gender
+    else:
+        return None
+    db.commit()
+    db.refresh(advisor)  #它去数据库把这条记录的最新值（包括新生成的 id）读回来，更新到 advisor 对象上。
+    return advisor