I've been using Cocoon2 to access Tamino for a while now. I wrote my own
Generator (included below) that uses Tamino's HTTP API. Basically, I submit
an XPath query via HTTP, and then generate SAX events from the query
results. This avoids DOM instantiation of the query results (which can be
quite large).
This generator takes database URL and XPath query parameters as the
following sitemap snippet demonstrates...
<map:generate type="tamino">
<map:parameter name="dburl"
value="http://your_database_url/tamino/your_database_name/"/>
<map:parameter name="collection" value="txdocs"/>
<map:parameter name="xpath" value="xpath_expression_here"/>
</map:generate>
make sure to declare it within the <map:generators/> element above as
follows...
<map:generator name="tamino" src="your_path_to/TaminoGenerator"/>
You can also override these parameters with HTTP request parameters of the
same name.
-Mitch
------Generator Code Here ---------------
//package org.apache.cocoon.generation;
import org.apache.avalon.excalibur.pool.Recyclable;
import org.apache.cocoon.Constants;
import org.apache.cocoon.generation.*;
import org.apache.cocoon.environment.Request;
import org.xml.sax.SAXException;
import org.xml.sax.InputSource;
import org.xml.sax.helpers.AttributesImpl;
import org.apache.xerces.parsers.SAXParser ;
import java.util.*;
import java.net.* ;
import java.io.* ;
/**
* Generates XML response from a Tamino query using the 3.1 Tamino API.
* Process HTTPRequest parameters to configure the query to Tamino.
* @author <a href="mailto:[EMAIL PROTECTED]";>Mitch christensen</a>
*/
public class TaminoGenerator extends ServletGenerator implements Recyclable
{
// put class variables here
String mDbURL = null ;
String mCollection = null ;
Request mRequest = null ;
String mDocFrom = null ;
String mDocTo = null ;
String mXPath = null ;
// The URI of the namespace of this generator.
private String URI="http://some_id_url";;
/**
* Generate XML data
*/
public void generate()
throws IOException,SAXException {
// get the request parameters
getParams() ;
// get the data from Tamino
InputSource is = getInputSource() ;
// now parse the Tamino results
SAXParser parser = new SAXParser() ;
parser.setContentHandler(this.contentHandler) ;
parser.setProperty("http://xml.org/sax/properties/lexical-handler";,
this.lexicalHandler) ;
parser.parse(is) ;
}
/*
* Execute a query with Tamino
*/
protected InputSource getInputSource()
throws IOException, MalformedURLException {
// open a network connection to Tamino
URL url = new URL(mDbURL + mCollection + "?_xql(" +
mDocFrom + "," + mDocTo + ")=" + mXPath) ;
// try to connect using stardard HTTP utils
HttpURLConnection conn = (HttpURLConnection)url.openConnection() ;
// return
return new InputSource(conn.getInputStream()) ;
}
/*
* Get the Tamino parameters
*/
protected void getParams() {
// start with the Request object (highest priority)
mDbURL = this.request.getParameter("dburl") ;
mCollection = this.request.getParameter("collection") ;
mXPath = this.request.getParameter("xpath") ;
mDocFrom = this.request.getParameter("docfrom") ;
mDocTo = this.request.getParameter("docto") ;
// any null values should check the sitemap parameters
if(mDbURL == null)
mDbURL = parameters.getParameter("dburl",
"http://localhost/tamino/mydb/";) ;
if(mCollection == null)
mCollection = parameters.getParameter("collection", "ino:etc") ;
if(mXPath == null)
mXPath = parameters.getParameter("xpath", "/") ;
if(mDocFrom == null)
mDocFrom = parameters.getParameter("docfrom", "1") ;
if(mDocTo == null)
mDocTo = parameters.getParameter("docto", "10") ;
}
}
-----Original Message-----
From: Kukkapalli PraveenKumar [mailto:[EMAIL PROTECTED]]
Sent: Thursday, December 13, 2001 2:55 AM
To: [EMAIL PROTECTED]
Subject: How can I access XML Native database using cocoon
Hi all,
I'm new to cocoon and this mailing list as well. I read that Cocoon is
supporting Native Databases and downloaded the Cocoon and installed in my
machine but I didn't get any Info. from the site that how to access native
database.
I'm using dbXML(Xindice).My frontend is XML and using DOM.I've to go to so
many pages and fill some forms, all the information I've given is stored as
DOM and whenever I submit that should submit to the database. Does it
supports.Please let me know..
Best wishes
Praveen
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