Combining XML files together

Question

my problem is as follows:
I have three tables (order's line item,order and customer information)I want to extract each of their information in XML file and join them in one XML file. I have the following code for generating each XML file
but I don't know how can I join them to make final XML file:
try
Connection cn = ConnectionHelper.getConnection();
OracleXMLQuery q1 = new OracleXMLQuery(cn,"SELECT * from orderlineitem
where order=1");
Connection cn = ConnectionHelper.getConnection();
OracleXMLQuery q2 = new OracleXMLQuery(cn,"SELECT * from order where
order=1");
Connection cn = ConnectionHelper.getConnection();
OracleXMLQuery q3 = new OracleXMLQuery(cn,"SELECT * from customer where
customerno=10");
// How can I join the above XML documents in one document
catch(Exception e)
e.printStackTrace();
Could anyone please send me code that how can I join those results in one XML
document?
With best regards,
Amirali

Answer 1

A low budget non xml way would be to create a MultipleInputStream class that takes a bunch of streams and treats them as one big stream. You pass an instance of this to your sax or dom parser.
InputStreams[] ises = getYourXMLFilesFromSomewhere();
MultipleInputStream mis = new MultipleInputStream();
mis.addStream(new StringStream("<root>");
mis.addStreames(ises);
mis.addStream(new StringStream("</root>");
XMLReader r = ......
r.parse(mis);