How to bind UI component to a view object which is created from a SQL query

Question

I am using JDeveloper 11.1.1.2.
I created a method in my ApplicationModule to create an instance of ViewObject dynamically based on a "voCode" passed in :
public ViewObject loadVO(String voCode) {
ViewObject viewObject = findViewObject(voCode);
if (viewObject == null) {
viewObject = createViewObject(programCode);
return viewObject;
I created a Client interface for this method and refreshed the data control of the ApplicationModule.
From the "Oracle JDeveloper 11g Handbook", I should be able to create a tree binding and a methodIterator executable for the "loadVO" method via the data control of the AM.
I tried to add the binding manually to the page definition of my jspx page as I like to see if I can replace an existing binding with this new binding.
I was not able to add the binding as the "Create Tree Binding" required both the "Root Data Source" and "Tree Level Rules" to be specified.
I could specify the "Root Data Source" to point to the "loadVO" and corresponding parameter but not able to add any rule.
When I clicked on the "+" icon to add rule, nothing happened that allowed me to specify the rule (if I know what rule I need to add).
How should I bind the application module method "loadVO" so that it can be exposed in the Data Control to provide the data for a UI component like dynamic table?
On the other hand, I could create the "methodIterator" first for the AM method "loadVO" but I wasn't able to create a tree binding to reference the "methodIterator".
Is it possible to invoke the loadVO method with specific parameter value via the "methodIterator" from a bean method?
Edited by: pyin_amec on Jan 25, 2010 3:57 PM
I corrected the subject line and change my question to better reflect the problem I tried to solve.
Edited by: pyin_amec on Jan 26, 2010 7:41 AM

Answer 1

Hi,
This worked for me .. I created a inputtext area where I can enter a query and execute ..
Hope it helps..
AM Impl
     public void createVoWithQuery( String pQuery )
          ViewObjectImpl vo = null;
          if( findViewObject( "DemoVo" ) != null )
               findViewObject( "DemoVo" ).remove();
          vo = ( ViewObjectImpl )createViewObjectFromQueryStmt( "DemoVo", pQuery );
          //  vo.setKeyAttributeDefs( new int[]{0} );
          vo.executeQuery();
     @Override
     protected void prepareSession( Session session )
          super.prepareSession( session );
          if( findViewObject( "DemoVo" ) == null )
               createViewObjectFromQueryStmt( "DemoVo", "Select 1 from dual" );
     }Page Def
<executables>
    <variableIterator id="variables">
      <variable Type="java.lang.String" Name="createVoWithQuery_pQuery" IsQueriable="false"/>
    </variableIterator>
    <iterator Binds="DemoVo" RangeSize="25" DataControl="AppModuleDataControl"
              id="ViewObj1Iterator" Refresh="deferred"/>
  </executables>
  <bindings>
    <tree IterBinding="ViewObj1Iterator" id="ViewObj1">
      <nodeDefinition Name="Dummy">
      </nodeDefinition>
    </tree>
    <methodAction id="createVoWithQuery" RequiresUpdateModel="true" Action="invokeMethod"
                  MethodName="createVoWithQuery" IsViewObjectMethod="false"
                  DataControl="AppModuleDataControl"
                  InstanceName="AppModuleDataControl.dataProvider">
      <NamedData NDName="pQuery" NDType="java.lang.String"
                 NDValue="${bindings.createVoWithQuery_pQuery}"/>
    </methodAction>
    <attributeValues IterBinding="variables" id="pQuery">
      <AttrNames>
        <Item Value="createVoWithQuery_pQuery"/>
      </AttrNames>
    </attributeValues>
  </bindings>page
<af:panelStretchLayout id="psl1" startWidth="0" topHeight="100px" bottomHeight="0">
          <f:facet name="center">
            <af:table rows="#{bindings.ViewObj1.rangeSize}"
                      fetchSize="#{bindings.ViewObj1.rangeSize}"
                      emptyText="#{bindings.ViewObj1.viewable ? 'No data to display.' : 'Access Denied.'}"
                      var="row" rowBandingInterval="0"
                      value="#{bindings.ViewObj1.collectionModel}"
                      selectedRowKeys="#{bindings.ViewObj1.collectionModel.selectedRow}"
                      selectionListener="#{bindings.ViewObj1.collectionModel.makeCurrent}"
                      rowSelection="single" id="t1" partialTriggers="::cbEx">
              <af:forEach items="#{bindings.ViewObj1Iterator.attributeDefs}" var="def">
                <af:column headerText="#{def.name}" sortable="true" sortProperty="#{def.name}"
                           id="c1">
                  <af:outputText value="#{row[def.name]}" id="ot1"/>
                </af:column>
              </af:forEach>
            </af:table>
          </f:facet>
          <f:facet name="bottom"/>
          <f:facet name="top">
            <af:panelFormLayout id="pfl1">
              <af:inputText value="#{bindings.pQuery.inputValue}"
                            label="#{bindings.pQuery.hints.label}"
                            required="#{bindings.pQuery.hints.mandatory}"
                            columns="60"
                            maximumLength="#{bindings.pQuery.hints.precision}"
                            shortDesc="#{bindings.pQuery.hints.tooltip}" id="it1" rows="2">
                <f:validator binding="#{bindings.pQuery.validator}"/>
              </af:inputText>
              <af:commandButton actionListener="#{bindings.createVoWithQuery.execute}"
                                text="ExecuteQuery"
                                disabled="#{!bindings.createVoWithQuery.enabled}" id="cbEx"/>
            </af:panelFormLayout>
          </f:facet>
        </af:panelStretchLayout>