Programmatically Change DataBindings.cpx

Question

Hi
I am using JDeveloper 11.1.1.3.
I have been trying to programmatically change data source connections in one of our applications. I first tried doing it in the application module. I could successfully create a new root AM, and query the new database, but was not sure of how I could refresh the VO to show the data from the changed database.
My second attempt was to create 2 separate AM's. I then added the VO to a JSF page and in the bindings created a pageFlow scope parameter, which I programmatically populated from a drop down list. This was successful. However that requires the development team to duplicate the AM's for each database exactly.
So my next attempt would be to have only one AM and try and change the configuration in the DataBindings file. The reason I would like to attempt this, is when I click on a DataControl in the DataControl Usage section of the DataBindings file, I see that in the Property Inspector for the DataControl, there is a Configurations property drop down list that contains all the available configurations for the AM. I would like to know if this can be accessed from code at runtime.
Any advice on how to achieve this or if it is possible would be welcomed.
Regards.
Leon.

Answer 1

hi leond,
I have done the same thing to change the application module configuration at runtime but its not working in my application.
actually I have one selectonechoicelist in Jspx page here I'm changing the configuration name but its not getting reflect either in table or console.
<af:selectOneChoice label="connection" id="soc1" autoSubmit="true"
                               valueChangeListener="#{schemachange.changecon}"
                                   partialTriggers="t1">
                <af:selectItem label="hr" value="HRSharedAMShared" id="si2"/>
                <af:selectItem label="scott" value="ScottSharedAMShared"
                               id="si1"/>
              </af:selectOneChoice>
<af:table value="#{bindings.LocationsView1.collectionModel}"
                        var="row" rows="#{bindings.LocationsView1.rangeSize}"
                        emptyText="#{bindings.LocationsView1.viewable ? 'No data to display.' : 'Access Denied.'}"
                        fetchSize="#{bindings.LocationsView1.rangeSize}"
                        rowBandingInterval="0"
                        selectedRowKeys="#{bindings.LocationsView1.collectionModel.selectedRow}"
                        selectionListener="#{bindings.LocationsView1.collectionModel.makeCurrent}"
                        rowSelection="single" id="t1" width="581"
                        partialTriggers="::soc1">
                <af:column sortProperty="LocationId" sortable="true"
                           headerText="#{bindings.LocationsView1.hints.LocationId.label}"
                           id="c3">
                  <af:outputText value="#{row.LocationId}" id="ot4">
                    <af:convertNumber groupingUsed="false"
                                      pattern="#{bindings.LocationsView1.hints.LocationId.format}"/>
                  </af:outputText>
                </af:column>
                <af:column sortProperty="StreetAddress" sortable="true"
                           headerText="#{bindings.LocationsView1.hints.StreetAddress.label}"
                           id="c2">
                  <af:outputText value="#{row.StreetAddress}" id="ot2"/>
                </af:column>
                <af:column sortProperty="PostalCode" sortable="true"
                           headerText="#{bindings.LocationsView1.hints.PostalCode.label}"
                           id="c1">
                  <af:outputText value="#{row.PostalCode}" id="ot5"/>
                </af:column>
                <af:column sortProperty="City" sortable="true"
                           headerText="#{bindings.LocationsView1.hints.City.label}"
                           id="c5">
                  <af:outputText value="#{row.City}" id="ot1"/>
                </af:column>
                <af:column sortProperty="StateProvince" sortable="true"
                           headerText="#{bindings.LocationsView1.hints.StateProvince.label}"
                           id="c4">
                  <af:outputText value="#{row.StateProvince}" id="ot3"/>
                </af:column>
              </af:table>backing bean code
    public String changecon(ValueChangeEvent valueChangeEvent)
        FacesContext fctx = FacesContext.getCurrentInstance();
        ELContext elctx = fctx.getELContext();
        Application app = fctx.getApplication();
        ExpressionFactory efactory = app.getExpressionFactory();
        ValueExpression vex = efactory.createValueExpression(elctx, "#{bindings}", Object.class);
        DCBindingContainer bindings = (DCBindingContainer) vex.getValue(elctx);
        if (bindings.getDataControl().getDef().getConfiguration() == "HRSharedAMShared")
            bindings.getDataControl().getDef().setConfiguration(valueChangeEvent.getNewValue().toString());
        else
            bindings.getDataControl().getDef().setConfiguration(valueChangeEvent.getNewValue().toString()); //("HRSharedAMShared");
        bindings.getDataControl().resetState();
        System.out.println("configuration name:\t" + bindings.getDataControl().getDef().getConfiguration());
        DCIteratorBinding iter = bindings.findIteratorBinding("LocationsView1Iterator");
        iter.executeQuery();
        System.out.println("iter rows:\t" + iter.getEstimatedRowCount());
        return null;
}can we do it on model layer also is their any way?
even I have created the applicationModule Instance in util class at model layer but its returning the proper data at console but not in the GUI table.
so please tell me the best way to achive it.
Thanks