diff --git a/PythonProject/dao/cla_dao.py b/PythonProject/dao/cla_dao.py
new file mode 100644
index 0000000..272c810
--- /dev/null
+++ b/PythonProject/dao/cla_dao.py
@@ -0,0 +1,85 @@
+from model.all_model import ClassManagement
+from fastapi import HTTPException
+from schema.cla_schema import claRequest
+
+
+def add_class_dao(c:claRequest,session):
+    try:
+        data = c.model_dump()
+        d = ClassManagement(**data)
+        session.add(d)
+    except:
+        session.rollback()
+        return '输入有误，请重新添加班级!'
+    else:
+        session.commit()
+        return '添加成功！'
+
+def get_class_dao(session):
+    try:
+        class_list=session.query(ClassManagement).filter(ClassManagement.delete_status==0).all()
+        return class_list
+    except:
+        raise HTTPException(status_code=406,detail="输入查询信息有误，请重新输入！")
+
+def update_class_dao(id:int,req:ClassManagement,session):
+    try:
+        session.query(ClassManagement).filter(ClassManagement.class_id==id)\
+        .filter(ClassManagement.delete_status==0).update(req.model_dump(exclude_unset=True))
+        session.commit()
+    except:
+        raise HTTPException(status_code=400,detail="更新格式错误或参数缺失，请重新输入！")
+    return '更新成功，请核对信息！'
+
+def delete_class(id:int,session):
+    try:
+        session.query(ClassManagement).filter(ClassManagement.class_id==id,ClassManagement.delete_status==0)\
+        .update({'delete_status': 1})
+        session.commit()
+    except:
+        raise HTTPException(status_code=404, detail="删除异常,请重新核对之后删除！")
+    return '删除成功，请核对信息！'
+
+def get_class_for_delete(id: int, session):
+    try:
+        obj = (
+            session.query(ClassManagement).filter(ClassManagement.class_id == id,ClassManagement.delete_status == 0).first()
+        )
+        if not obj:
+            raise HTTPException(status_code=404, detail="班级不存在")
+    except HTTPException:
+        raise
+    except Exception:
+        raise HTTPException(status_code=500, detail="查询异常，请重新核对！")
+
+    return {
+        "class_id": obj.class_id,
+        "class_name": obj.class_name,
+        "start_class_date": obj.start_class_date,
+        "head_teacher_id": obj.head_teacher_id,
+        "class_teacher_id": obj.class_teacher_id,
+    }
+
+
+def hard_delete_class(id: int, session):
+    try:
+        obj = (
+            session.query(ClassManagement).filter(ClassManagement.class_id == id,ClassManagement.delete_status == 0)
+            .first()
+        )
+        if not obj:
+            raise HTTPException(status_code=404, detail="班级不存在")
+
+        session.delete(obj)
+        session.commit()
+    except HTTPException:
+        raise
+    except Exception:
+        session.rollback()
+        raise HTTPException(status_code=500, detail="删除异常，请重新核对之后删除！")
+
+    return '删除成功，请核对信息！'
+
+
+
+