diff --git a/students/api/students_api.py b/students/api/students_api.py
index 9dec3db..5072dcc 100644
--- a/students/api/students_api.py
+++ b/students/api/students_api.py
@@ -30,7 +30,7 @@ def get_students( stu:StudentsQuery = Depends()
                  f'注意事项：\n'
                  f'时间格式：YYYY-MM-DD\n'
                  f'班级ID和顾问ID必须已经存在才可以绑定'
-    ,response_model=StudentsResponse )
+            )
 def add_student( stu:StudentsResponse = Depends()
                 , db=Depends(get_db)
                  ):
diff --git a/students/dao/students_dao.py b/students/dao/students_dao.py
index 7b80c76..79888e6 100644
--- a/students/dao/students_dao.py
+++ b/students/dao/students_dao.py
@@ -66,7 +66,13 @@ def add_student_dao( s , db):
         if not phone:
             raise ValueError("手机号不能为空")
         if not s.get("class_id") or not s.get("advisor_id"):
-            raise ValueError("班级ID和顾问ID必须已经存在才可以绑定")
+            raise ValueError("班级ID和顾问ID不能为空")
+        s1_class_id = db.query(Students).filter(Students.phone == phone).first()
+        s1_advisor_id = db.query(Students).filter(Students.phone == phone).first()
+        if not s1_class_id:
+            raise ValueError(f"班级ID {s.get("class_id")} 不存在，请先创建班级")
+        if not s1_advisor_id:
+            raise ValueError(f"顾问ID {s.get("advisor_id")} 不存在，请先创建顾问")
         if s1_deleted and s1_deleted.is_deleted == True:
             s1_deleted.name = s.get("name")
             s1_deleted.age = s.get("age")
@@ -92,16 +98,16 @@ def add_student_dao( s , db):
             return s1_deleted
         s1 = Students( **s )
         db.add(s1)
+        db.commit()
     except ValueError as e:
         # 业务校验异常：回滚并返回错误信息
         db.rollback()
         return {"code": 400, "msg": str(e)}
-    except Exception:
+    except Exception as e:
         # 这里可以加日志
         db.rollback()
         return {"code": 500, "msg": f"系统异常: {str(e)}"}
     else:
-        db.commit()
         db.refresh(s1)
         return s1
 
@@ -147,14 +153,14 @@ def update_student_dao( s , db):
         # 额外字段
         if s.get("phone") is not None:
             s1_id.student_phone = s.get("phone")
+        s1_id.update_date = datetime.now()
+        db.commit()
     except HTTPException:
         raise
     except Exception:
         db.rollback()
         raise
     else:
-        s1_id.update_date = datetime.now()
-        db.commit()
         db.refresh(s1_id)  # 从数据库再拉一次数据
         return s1_id