diff --git a/src/main/java/top/suyiiyii/sims/service/UserService.java b/src/main/java/top/suyiiyii/sims/service/UserService.java
index 884c6a0..9cd596f 100644
--- a/src/main/java/top/suyiiyii/sims/service/UserService.java
+++ b/src/main/java/top/suyiiyii/sims/service/UserService.java
@@ -136,4 +136,8 @@ public class UserService {
     public List<Role> selectRolesById(Integer studentId) {
         return roleMapper.selectRolesById(studentId);
     }
+
+    public Integer getStudentIdByUserId(Integer userId) {
+        return userMapper.getStudentIdByUserId(userId);
+    }
 }