5426l3

Listing 3: WelcomePresentation.java, the Java Class that Displays Our
HTML with Input from the Database

/*
 *  blog
 *
 *  Enhydra super-servlet presentation object
 *
 */

package il.co.lerner.presentation;

// Enhydra SuperServlet imports
import com.lutris.appserver.server.httpPresentation.HttpPresentation;
import com.lutris.appserver.server.httpPresentation.HttpPresentationComms;
import com.lutris.appserver.server.httpPresentation.HttpPresentationException;

// The following two lines import our specific data objects
import blog.*;
import com.lutris.dods.builder.generator.query.*;

// We will use a Vector to build our query
import java.util.Vector;

// Standard imports
import java.io.IOException;
import java.util.Date;
import java.text.DateFormat;

public class WelcomePresentation implements HttpPresentation {


    public void run(HttpPresentationComms comms)

        throws HttpPresentationException, IOException,
	       NonUniqueQueryException, DataObjectException, QueryException
    {
	// Get the HTML from the Welcome page as an object
        WelcomeHTML welcome =
	    (WelcomeHTML)comms.xmlcFactory.create(WelcomeHTML.class);

	// Create a new query object
	BlogEntriesQuery blogq = new BlogEntriesQuery();

	// Retrieve entries that came before now -- this lets us write
	// blog entries with future dates, which comes on-line
	// automatically at a certain point
	blogq.setQueryEntrydate("NOW()", QueryBuilder.LESS_THAN);

	// Indicate that we want DESC order
	blogq.addOrderByEntrydate(false);

	// Execute our query, returning an array of blog entries
	BlogEntriesDO[] blogEntries = blogq.getDOArray();
	
	// Put the first text and date entries in the text
	welcome.setTextDate(blogEntries[0].getEntrydate());
	welcome.setTextText(blogEntries[0].getText());

	// Send the HTML back to the user's browser
        comms.response.writeDOM(welcome);
    }

}