删除传来的相应用户ID

<%//接受用户ID
long id;
try{
  id=Long.parseLong(request.getParameter("id"));
   }catch (Exception e)
   {
    id=0;
   }
%>
<%//构造删除记录SQL语句
String sqlString=null;
if(id!=0){
  sqlString="delete from usertable where id="+id;
    try{
    Connection con;
    Statement sql;
    Class.forName("com.mysql.jdbc.Driver");//加载数据库驱动程序；
    con=DriverManager.getConnection("jdbc:mysql://localhost:3306/jsp","root","7056503");
     sql=con.createStatement();
     sql.executeUpdate(sqlString);
     con.close();
    
    }
    catch(SQLException e){
     out.print("SQL异常！");
    }
}

  %>