BC4J/JSP:Foreign Keys:Read Only Renderers

Question

I've read and implemented all of the Renderers in the Renderer how to document. I've also read 8 pages of postings to this forum regarding renderers and LOVs. And I've read reams of BC4J class documentation.
Though the EditRenderer that does a lookup via a SQL query works well, there is no equivalent Read-only (via a SQL query) Renderer example.
I have tried to use the examples to create a Read-only (SQL based) Renderer but I haven't had much luck.
The closest I got to a solution was an indicator that another poster accomplishes this by modifying the generated JSP. This is clearly the wrong place to implement this functionality (doesn't allow for code re-use).
I was also able to use the DynamicEditRenderer as a Read-Only Renderer but that would confuse my users and create bugs.
It was my idea that you shouldn't have to define the SQL and that you could use existing BC4J classes to lookup the friendly FK value. I looked through the XML files for View Objects and View Links and saw all the information required to do this. A smart person (obviously much smarter than me), should be able to create a read-only and Edit Renderer that doesn't require a SQL property or the PK or column properties (use the UK from the db).
Does someone have an example of a Read-Only, SQL based, Renderer? Better, has someone written a generic renderer that can track back through View Links to find the UK in the lookup table?
This is incredibly basic functionality that I'm surprised is missing from JDeveloper.
Please help.
Thanks, George

Answer 1

You are not going to find an 'exact' match in our existing classes. The rednering HOWTO(http://otn.oracle.com/products/jdev/howtos/jsp/renderers.html) provides enough information for implementing your readonly lookup field. If you look at the first renderer in this document, it uses a static lookup list. You can easily use a secondary view object for your lookup values. Here is the code from that document:
package myrenderers;
import oracle.jdeveloper.html.ReadOnlyField;
import oracle.jbo.Row;
import oracle.jbo.AttributeDef;
import java.util.StringTokenizer;
public class ListFieldRenderer extends ReadOnlyField
public ListFieldRenderer()
public String renderToString(Row row)
setValueFromRow(row);
AttributeDef aDef = getAttributeDef();
String sAttrValue = getValue();
String sList = (String)aDef.getProperty("DISPLAY_LIST");
if(sAttrValue != null && sList != null)
StringTokenizer tokens = new StringTokenizer(sList, ",", false);
while(tokens.hasMoreTokens())
String sEntry = tokens.nextToken();
String sValue = sEntry.substring(sEntry.indexOf('=') + 1);
String sKey = sEntry.substring(0, sEntry.indexOf('='));
if(sKey.equals(sAttrValue))
return sValue;
return super.renderToString(row);