修正根据文章id查找username问题

src/com/hellogithub/dao/articleDao.java

@@ -115,7 +115,7 @@ public class articleDao {
             preparedStatement1 = conn1.prepareStatement(sql1);
 
             rs = preparedStatement.executeQuery();
-            preparedStatement1.execute(sql1);
+            preparedStatement1.executeUpdate(sql1);
 
             while(rs.next()){
                 int articleid = rs.getInt(1);