diff --git a/PythonProject/dao/student_dao.py b/PythonProject/dao/student_dao.py
index f935b0e..b93a8ed 100644
--- a/PythonProject/dao/student_dao.py
+++ b/PythonProject/dao/student_dao.py
@@ -17,3 +17,9 @@ def select_age(min_age,max_age,session=Depends(get_db)):
     except Exception:
         raise HTTPException(status_code=500,detail="查询异常")
 
+def select_gender(gender,session=Depends(get_db)):
+        if gender is None and session is None:
+            return None
+
+
+