diff --git a/PythonProject/dao/student_dao.py b/PythonProject/dao/student_dao.py
index 9806925..ab173e9 100644
--- a/PythonProject/dao/student_dao.py
+++ b/PythonProject/dao/student_dao.py
@@ -20,12 +20,8 @@ def select_age(min_age,max_age,session=Depends(get_db)):
 
 def add_student_dao(o,db=Depends(get_db)):
     try:
-        r = db.query(Student_Model).filter(Student_Model.stu_id == o['stu_id'],Student_Model.delete_status == 0).all()
-        if not r:
-            o1 = Student_Model( **o)
-            db.add(o1)
-        else:
-            raise ValueError
+        o1 = Student_Model( **o)
+        db.add(o1)
     except:
         db.rollback()
         return False
@@ -35,8 +31,8 @@ def add_student_dao(o,db=Depends(get_db)):
 
 def delete_student_dao(stu_id,db=Depends(get_db)):
     try:
-        rows = db.query(Student_Model).filter(Student_Model.stu_id == stu_id,Student_Model.delete_status == 0).delete()
-        Student_Model.delete_status = 1
+        rows = db.query(Student_Model).filter(Student_Model.stu_id == stu_id,Student_Model.delete_status == 0)\
+            .update({'delete_status':1})
         db.commit()
     except:
         db.rollback()
diff --git a/PythonProject/schema/employment_schema.py b/PythonProject/schema/employment_schema.py
new file mode 100644
index 0000000..e69de29