How to create adf columns at runtime

Question

Hello
I want to crete a component which will display results of arbitrary sql command.
for that purpose I created 'declared component' with custom component class which obtains SQL query from passed attibute and executes it.
so in my component I have
public List<String> getColumnNames() {
if (!loaded) {
loadData();
return columnNames;
public List<List<Object>> getData() {
if (!loaded) {
loadData();
return data;
and in compDef.jspx following:
<af:table value="#{component.data}" var="row">
<af:column headerText="No">
<af:outputText value="#{row}" />
</af:column>
<af:forEach items="#{component.columnNames}" var="col" varStatus="colStatus">
<af:column headerText="#{col}">
<af:outputText value="#{row[colStatus.index]}" />
</af:column>
</af:forEach>
</af:table>
query execution is ok and component.columnNames contains several columns (checked this with af:iterator)
but it shows only 1 column (with header 'No').
If I use
<af:iterator value="#{component.columnNames}" var="col" varStatus="colStatus">
<af:column headerText="#{col}">
<af:outputText value="#{row[colStatus.index]}" />
</af:column>
</af:iterator>
it shows 4 columns instead of 2 (and doesn't show any text - that is headerText is empy and all cells are empy too)
So, can anybody tell me how is it ment to be ? Or where is the mistake ?
Version: 11g TP 4.

Answer 1

Thank you for your reply.
Well, if I set headers to
xx #{col} xx idx: #{colStatus.index} :idx
it shows only static text and no EL values.
(So in output I have 4 headers with text "xx xx idx: :idx")
Actually if I use suck mix of af:table and af:forEach in usual jspx file (not in component's one) - it works as expected
that is
code
<af:table value="#{Query1.data}" var="row">
<af:column headerText="xxxxx">
<af:outputText value="#{row}" />
</af:column>
<af:forEach items="#{Query1.columnNames}" var="col" varStatus="colStatus">
<af:column headerText="#{col}">
<af:outputText value="#{row [ colStatus.index ] }" />
</af:column>
</af:forEach>
</af:table>
where Query1 JSF bean performs the same functionality (executes arbitrary SQL query and stores results in data and columnNames)
works OK.
(colStatus.index is written in brackets - don't know how to disable its transformation to link, how to write preformatted code here ?)
Another point that behaviour in component's jspx is a bug - the amount of columns.
It produces 4 columns instead of 2. And I can't figure why because it doesn't show any information neither in var 'col' nor in varStatus 'colStatus'.
And if I the query returns 3 columns - number of columns in generated table is 9.
UPD. Specified behaviour is for af:iterator in the component's jspx. af:forEach produces no columns at all.
Edited by: olegk on Mar 26, 2009 11:05 AM