Multiple RowSets in a Web Bean

Question

Hello and thank you all for all the help earlier. :)
I have a question concerning Web Beans. Each web bean is initialized through a JSP page. So far I've only been able to use one view object for each web bean. My problem is that I have data that I've picked up from one view object that I wish to insert in another.
I can't figure out though how to do this. I made it one time using static variables which was a solution I disliked a lot. This problem is appearing over and over again. There must be a simple way to do this...
I was thinking in the lines of using multiple view objects for a web bean, but I'm not sure if that's even possible. With static variables I could first initialize the web bean with one view object, put my data in the static variables, exit to the JSP page and reentering with a new view object initialized.
There must be an easier and smarter way for this... ;)
Any ideas, anyone?
/Janne
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Answer 1

Yes, it's true that you can only use one view object for each web bean. You can have multiple web beans per JSP, but I'm not sure that solves your problem.
For example, I have a 'reporting' application with a JSP page that displays some dynamic LOVs and text fields for the user to enter their search criteria. When they submit that JSP form, another JSP is called.
This second 'processing' JSP includes several web beans. The first is a custom web bean to do some date calculations and set some session parameters, the next is a RowSetNavigator which takes the data from the form fields, does some analysis and builds up a where clause for the report query, the next are more custom beans that print out a dynamic title and some other information to the browser, the last prints the report results itself.
This allows me to do both data processing and report printing all in one JSP page. But again, I'm not sure this serves your needs.
Another approach is to create a custom web bean, and initialize the 'second' view object in that web bean. I've included a code sample below:
Here is the JSP usebean tag. I take a parameter from a form, and pass that to the render method of my custom web bean:
<jsp:useBean class="wt_bc.staticWalkthruBean" id="swb" scope="request" >
<%
// get presentation name parameter
String p = request.getParameter("p");
swb.initialize(application,session, request,response,out,"wt_bc_WT_bcModule.wtinfoView");
swb.render(p);
%>
</jsp:useBean>
Here is the content of the custom web bean, sorry the formatting doesn't work great in this forum. In this particular example, I am setting a where clause, executing a query and printing the online walkthrough to a static HTML file on the file system (I have a different bean for doing the printing). Obviously you'd have to modify your bean to do the inserts, etc.:
package wt_bc;
import java.io.*;
import oracle.jbo.*;
import oracle.jdeveloper.html.*;
public class staticWalkthruBean extends oracle.jdeveloper.html.DataWebBeanImpl {
public void render(String p) {
try
// set up the print bean
wt_bc.printStaticHTMLBean wtb;
wtb = new wt_bc.printStaticHTMLBean();
// print one or all walkthroughs ?
if (p.equals("all")) {
int i;
Row[] rows;
// use a RowSetNavigator to loop // through each presname in //wtinfoView
oracle.jbo.html.databeans.RowsetNavigator rsn;
rsn = (oracle.jbo.html.databeans.RowsetNavigator) new oracle.jbo.html.databeans.RowsetNavigator();
rsn.initialize(application,session, request,response,out,"wt_bc_WT_bcModule.wtinfoView");
rsn.getRowSet().getViewObject().executeQuery();
rsn.getRowSet().first();
rows = rsn.getRowSet().getViewObject().getAllRowsInRange();
//This loop iterates through each //presentation
for(i = 0 ; i < rows.length; i++)
// get variable values from the // session
String pn = rows.getAttribute( 0 ).toString();
String theclause = "presname = '" + pn + "'";
// initialize the view object we // will use to print, exeucte the // query and render the pages
wtb.initialize(application,session, request,response,out,"wt_bc_WT_bcModule.wtjoinView"); wtb.getRowSet().getViewObject().setWhereClause(theclause); wtb.getRowSet().getViewObject().executeQuery();
wtb.getRowSet().first(); wtb.render(pn);
}// end for loop
else {
// just printing one walkthrough
String theclause = "presname = '" + p + "'";
// initialize the view object
//exeucte the query and render the //pages
wtb.initialize(application,session, request,response,out,"wt_bc_WT_bcModule.wtjoinView"); wtb.getRowSet().getViewObject().setWhereClause(theclause); wtb.getRowSet().getViewObject().executeQuery();
wtb.getRowSet().first(); wtb.render(p);
}// end if p=all
} catch(Exception ex)
throw new RuntimeException(ex.getMessage());
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