GetAttribute() method of a view object is returning NULL

Hi ,
I am trying to implement PPR in one of my OAF page and I have taken the following approach.
I have declared the follwing transient boolean attribute in the VO() apart from the existing attribute "Meaning" .
1.MfgEnttity
2.MfgAcct
3.MfgSubAcct
4.MfgCc
5.MfgProj
In the page I have used these attributes in the rendered property as "${oa.XXR2RMfgproSegVO.MfgSubAcct}" like this.
Now in the CO I have written the following code.
public void processRequest(OAPageContext pageContext, OAWebBean webBean)
super.processRequest(pageContext, webBean);
OAApplicationModule am = pageContext.getApplicationModule(webBean);
am.invokeMethod("initializeXXR2RMfgproSegVO");
public void processFormRequest(OAPageContext pageContext, OAWebBean webBean)
super.processFormRequest(pageContext, webBean);
String event = pageContext.getParameter(EVENT_PARAM);
String source = pageContext.getParameter(SOURCE_PARAM);
OAApplicationModule am = (OAApplicationModule)pageContext.getApplicationModule(webBean);
am.invokeMethod("handleSegmentChangeEvent");
And the AM code is as follows:
public void initializeXXR2RMfgproSegVO()
OAViewObject vo = getXXR2RMfgproSegVO();
if(!vo.isPreparedForExecution())
vo.executeQuery();
Row row = vo.createRow();
vo.insertRow(row);
row.setNewRowState(Row.STATUS_INITIALIZED);
public void handleSegmentChangeEvent()
OAViewObject pVO = (OAViewObject)findViewObject("XXR2RMfgproSegVO");
OARow hdrRow = (OARow)pVO.getCurrentRow();
String status = (String)hdrRow.getAttribute("Meaning");
System.out.println("poRow "+ hdrRow.toString());
System.out.println("value of the status is "+ status);
if("Entity".equals(status))
hdrRow.setAttribute("MfgEnttity", Boolean.TRUE);
hdrRow.setAttribute("MfgAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgSubAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgCc", Boolean.FALSE);
hdrRow.setAttribute("MfgProj", Boolean.FALSE);
} else
if("Account".equals(status))
hdrRow.setAttribute("MfgEnttity", Boolean.FALSE);
hdrRow.setAttribute("MfgAcct", Boolean.TRUE);
hdrRow.setAttribute("MfgSubAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgCc", Boolean.FALSE);
hdrRow.setAttribute("MfgProj", Boolean.FALSE);
}else
if("Subaccount".equals(status))
hdrRow.setAttribute("MfgEnttity", Boolean.FALSE);
hdrRow.setAttribute("MfgAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgSubAcct", Boolean.TRUE);
hdrRow.setAttribute("MfgCc", Boolean.FALSE);
hdrRow.setAttribute("MfgProj", Boolean.FALSE);
}else
if("Cost Center".equals(status))
hdrRow.setAttribute("MfgEnttity", Boolean.FALSE);
hdrRow.setAttribute("MfgAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgSubAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgCc", Boolean.TRUE);
hdrRow.setAttribute("MfgProj", Boolean.FALSE);
} else
if("Project".equals(status))
hdrRow.setAttribute("MfgEnttity", Boolean.FALSE);
hdrRow.setAttribute("MfgAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgSubAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgCc", Boolean.FALSE);
hdrRow.setAttribute("MfgProj", Boolean.TRUE);
else
hdrRow.setAttribute("MfgEnttity", Boolean.FALSE);
hdrRow.setAttribute("MfgAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgSubAcct", Boolean.FALSE);
hdrRow.setAttribute("MfgCc", Boolean.FALSE);
hdrRow.setAttribute("MfgProj", Boolean.FALSE);
Now when in the page I am changing the value of the attribute "Meaning" it is always getting into the else part i.e. where all the attributes are "False".
The two System.out.Println statements are returning the follwing values.
10/03/22 15:41:08 poRow [email protected]3
10/03/22 15:41:08 value of the status is null
Can you please suggest why this "Status" is returning NULL and how I can get the current row selected in the page?
Thanks
Subhabrata

Hi Pratap,
Thanks a lot for your reply.
Can you please suggest how can I rectify the code.I have tried commenting the AM code as follows
public void initializeXXR2RMfgproSegVO()
OAViewObject vo = getXXR2RMfgproSegVO();
if(!vo.isPreparedForExecution())
vo.executeQuery();
//Row row = vo.createRow();
//vo.insertRow(row);
//row.setNewRowState(Row.STATUS_INITIALIZED);
But in the page when I am selecting any segment its throwing Null pointer Exception.
I am new in OAF and this is an urgent client requirement.Please suggest me Where exactly I need to make change in my code.
Thanks in advance...
Thanks
Subhabrata

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Basically, if the queries are all perfect, everything works fine, but if a query fails, I can't execute a myView.remove in an exception handler. Nor can I clean it up in a finally block. The only other way I can think of to handle this would be to re-use the same view object and just change the SQL being passed to it, but there's no methods to set the SQL directly on the view object, only at creation time as a method call from the application module.
Can anyone offer any suggestions as to how to deal with this?

I figured this out. You can pass a null name to the createViewObjectFromQueryStmt method, which apparently creates a unqiue name for you. I got around my variable scoping issue by re-thinking my loop logic.

Replace default table sort with order by on the view object

The Jdeveloper help for af:table says:
If the underlying model is not a CollectionModel , the Table automatically examines the actual data to determine which properties are sortable. Any column that has data that implements java.lang.Comparable is sortable. This automatic support cannot be nearly as efficient as coding sorting directly into a CollectionModel (for instance, by translating the sort into an "ORDER BY" SQL clause), but is sufficient for small data sets.
I have a database table with varchar2 columns that can contain string, date or number values. So in the af:table I want to sort the columns either in string, date or number order.
I tried creating a sort listener and in that listener set the view object order by clause and execute the query, but it does not affect the row order - it is always sorted as a string. I assume that the collection is doing its sort after I do the query, and overwriting the query order. I have tried disabling the sort in the listener by setting the sortcriteria to null but it has no effect.
Can anyone suggest how to stop the default sort re-ordering the rows, or else how to code sorting directly into the CollectionModel as suggested in the help.
Hugh Nelson

By running in debug I discovered that when you click on a column heading to sort by the column values it actually sets the order by clause on the view object and executes a query. The help says that the default sorting is not as efficient as setting the order by clause - perhaps the help is out of date because default sorting does set the order by clause.
This means that you cannot do a column sort on a transient attribute. The attribute being sorted on must exist in the table/query.
The easiest solution is to override the setOrderByClause method on the view object. The string parameter is the column to order by eg "COLUMNA". If this column holds date values I can change it to something like "TO_CHAR(TO_DATE(COLUMNA,'DD-MON-YYYY'),'YYYYMMDD')". For numbers I do "LPAD(COLUMNA,10,'0')".
This works OK.
Hugh Nelson

How do I query changed view object attribute in another view object

Jdeveloper 10.1.3.4
My requirement is that I want to be able to query a view object (based on entity) on a non-key attribute where the value I am searching on may either be in the database on an existing record or, have just been recorded by updating a different view object based on the same entity (and yet to be committed).
When querying the second view object for a value just updated via a different view object, the second view object always returns no rows. I had expected the process to be :
EntityA
ViewObjectA based on EntityA
ViewObjectB based on EntityA
ViewObjectA - query row with key = 123. update attribute Y with value 456 (attribute Y in database null). Entity cache for EntityA, key 123, atttribute Y updated with value 456
ViewObjectB - query row with attribute = Y. expect record in EntityA cache just updated to be returned. Instead, nothing is returned
Here is the code I was using (where RandScheduleEdit and RandScheduleSearch are identical view objects based on entity object RandSchedule)
public static void main(String[] args) {
    String        amDef = "test.cache.model.AppModule";
    String        config = "AppModuleLocal";
    ApplicationModule am = Configuration.createRootApplicationModule(amDef,config);
    ViewObject rsEdit = am.findViewObject("RandScheduleEdit");
    Key rsKey = new Key(new Object[]{40});
    Row[] rsEditRows = rsEdit.findByKey(rsKey,1);
    Row rsEditRow = rsEditRows[0];
    rsEditRow.setAttribute("SId", new Number(7827));
    ViewObject rsSearch = am.findViewObject("RandScheduleSearch");
    rsSearch.setWhereClause("S_ID = :SId");
    rsSearch.defineNamedWhereClauseParam("SId", null, null);
    rsSearch.setNamedWhereClauseParam("SId",new Number(7827));
    rsSearch.executeQuery();
    Row rsSearchRow = rsSearch.first();
    Configuration.releaseRootApplicationModule(am, true);
}Why does rsSearch not find the record S_ID = 7827 ? It seems to only be querying new records in the database and ignoring the cached record just updated ?
Any help greatly appreciated.
Cheers,
Brent

rsSearch.setNamedWhereClauseParam("SId",new Number(7827));This might help:
rsSearch.setQueryMode(ViewObject.QUERY_MODE_SCAN_ENTITY_ROWS);
rsSearch.executeQuery();

JDev 10.1.3 EA Studio Edition - View Object Editor java glitch

Just thought I'd mention what appears to be a glitch - under the "java" section of the View Object editor, the checkbox for generate "Custom Java DataSource Methods" does not appear to function. Selecting it does not add the custom datasource methods in the View Object class.

Just thought I'd mention what appears to be a glitch - under the "java" section of the View Object editor, the checkbox for generate "Custom Java DataSource Methods" does not appear to function. Selecting it does not add the custom datasource methods in the View Object class.

Call view object from ViewController [SOLVED]

I'm using a valueChangeListener method in a managed bean, which I'd like to use to call a method on a view object. How can I call the view object from a managed bean class?
Regards

Maik,
It is best practice to create a method on your application module, and have this method manipulate VO's and call VO methods.
See section 8.5.3.1 in ADF Developers Guide for more info o calling an AM method from a managed bean:
http://download-west.oracle.com/docs/html/B25947_01/bcservices005.htm#sthref673
Please use the JDeveloper forum in the future for question like this, that are not related to JHeadstart.
Steven Davelaar,
Jheadstart team.

Modifying where clauses for View Objects in Backing Beans

In studying the RichTable class I saw no get/set methods that would allow me to manipulate the underlying view instance and rowset for the table in the Backing Bean. I know there is a way to do it, but I having great difficulty in finding it. The tutorials show how to build view objects and display them, but I haven't seen a tutorial that show how to respond to events from the Web page and directly change the data model and what is displayed via the backing bean.
Can some one point to a tutorial or give me an example on how I can change a view object via a backing bean?

What you want to do is add a method to your View Object Implementation class that changes the WHERE clause with setWhereClause or addWhereClause. Expose the method to your client. Then call the method from your page by binding it to a commandButton or commandLink. You can bind it through a pageDef file or a backing bean.

GetAttribute() method of a view object is returning NULL

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