diff --git a/src/com/hellogithub/dao/UserDao.java b/src/com/hellogithub/dao/UserDao.java
index 81dd1ca..26163f3 100644
--- a/src/com/hellogithub/dao/UserDao.java
+++ b/src/com/hellogithub/dao/UserDao.java
@@ -349,15 +349,19 @@ public class UserDao {
 
     public void LevelUp(String username){
         String sql = "UPDATE user SET userLevel = userLevel+1 WHERE userName = ? AND contributionValue >= 100;";
-        String sql1 = "UPDATE user SET contributionValue = 0;";
+        String sql1 = "UPDATE user SET contributionValue = 0 WHERE userName = ?;";
         try{
             Connection conn = JdbcUtils.getConnection();
             Connection conn1 = JdbcUtils.getConnection();
             PreparedStatement prep = conn.prepareStatement(sql);
+            PreparedStatement prep1 = null;
             prep.setString(1, username);
-            prep.executeUpdate();
-            PreparedStatement prep1 = conn1.prepareStatement(sql1);
-            prep1.executeUpdate();
+            int match = prep.executeUpdate();
+            if(match == 1){
+                prep1 = conn1.prepareStatement(sql1);
+                prep1.setString(1, username);
+                prep1.executeUpdate();
+            }
             JdbcUtils.closeConnection(prep,conn);
             JdbcUtils.closeConnection(prep1,conn1);
         }catch(SQLException e){
diff --git a/src/com/hellogithub/servlet/LevelUpServlet.java b/src/com/hellogithub/servlet/LevelUpServlet.java
index 92a94a8..bb265c8 100644
--- a/src/com/hellogithub/servlet/LevelUpServlet.java
+++ b/src/com/hellogithub/servlet/LevelUpServlet.java
@@ -3,11 +3,11 @@ package com.hellogithub.servlet;
 import com.alibaba.fastjson.JSONObject;
 import com.hellogithub.entity.userEntity;
 import com.hellogithub.service.UserService;
-import jakarta.servlet.ServletException;
-import jakarta.servlet.http.HttpServlet;
-import jakarta.servlet.http.HttpServletRequest;
-import jakarta.servlet.http.HttpServletResponse;
-import jakarta.servlet.http.HttpSession;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
 
 import javax.servlet.annotation.WebServlet;
 import java.io.IOException;