问java输出xml问题

我在oracle数据库有一个表，有两个字段，id和xml_c 分别为varchar2和xmltype类型，请问怎么编写程序应用jdbc从数据库中通过id查询到xml_c并且把它输出到指定的文件内，比如：c:/xml_out.xml

google_ad_width = 250; google_ad_height = 250; google_ad_format = "250x250_as"; google_color_url = "000000";

我的源程序如下：

public void myclass

{

try

{

// register the Oracle JDBC drivers

DriverManager.registerDriver(

new oracle.jdbc.OracleDriver()

);

// EDIT IF NECESSARY

// create a Connection object, and connect to the database

// as store using the Oracle JDBC Thin driver

myConnection = DriverManager.getConnection(

"jdbc:oracle:thin:@localhost:1521:ORCL",

"scott",

"tiger"

);

// disable auto-commit mode

myConnection.setAutoCommit(false);

// create a Statement object

myStatement = myConnection.createStatement();