关于执行excuteUpdate的问题

import java.sql.*;
public class Test {
    
    /** Creates a new instance of Test */
    public Test() {
    }
    public static void main(String agr[]){
        try {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        }
        try {
            Connection cn=DriverManager.getConnection("jdbc:odbc:example");
            PreparedStatement ps=cn.prepareStatement("insert into UserOnLine (user_id,user_name) values('5','7')");
            ps.executeUpdate();
            ps=cn.prepareStatement("insert into UserOnLine (user_id,user_name) values('5','7')");
            ps.executeUpdate();
             ps=cn.prepareStatement("select * from UserOnLine",ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
            ResultSet rs=ps.executeQuery();
            while(rs.next())
            {
                System.out.println(rs.getString(3));
                
            }
            rs.last();
            System.out.println(rs.getRow());
            cn.commit();
            rs.close();
            ps.close();
            cn.close();
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }
    
}
打印说明已经插入成功但是没有在UserOnline里显示怎么回事