Issue while populating a Transient VO based on three VO's

Question

Hi,
I have transient VO which is being populated based on Three SQL based VO. Each VO returns a Column and all these three columns needs to be shown as a table in UI.
I populated a TransientVO by iterating the the Three VO's since the number of Rows returned are always finite (12).
I dragged an dropped the TransientVO as a ADF Read Only Table.
On click of a Button in UI I am executing an AMImpl method which populates the TransientVO.
Issue which I am facing is ..
even though the 12 Rows gets populated in TransientVO, I am able to see only 11 Rows in the UI and 1st Row is always Null,
Please find my AMImpl code snippet below which I am using for Populating the transient VO.
sqlVO1.reset();
sqlVO2.reset();
sqlVO3.reset();
TransientVO.reset();
for (int i =0 ; i < 12; i++)
        row1= (Past12InventoryVORowImpl) sqlVO1.next();
        row3 = (Past36InventoryVORowImpl) sqlVO2.next();
        row2 = (Past24InventoryVORowImpl) sqlVO3.next();
        transientVoRow = (InventoryGridTransVORowImpl)TransientVO.next();
        if(row1 != null && row2 != null && row3!= null && transientVoRow!= null){ 
         transientVoRow.setPeriod(row1.getMonth());
         transientVoRow.setPast12SalesAmount(row1.getSalesAmount());
         transientVoRow.setPast24SalesAmount(row2.getSalesAmount());
         transientVoRow.setPast36SalesAmount(row3.getSalesAmount());
         transientVoRow.setPast12SalesCount(row1.getSalesCount()); 
          transientVoRow.setPast24SalesCount(row2.getSalesCount());
          transientVoRow.setPast36SalesCount(row3.getSalesCount());
}}Please let me know is there a better way of doing this ? Also I want to know is it possible to have a dynamic table in which each columns are referencing to different ViewObjects. like in my case
I want a Table a to have some sets of columns from 3 Different VO.

Answer 1

Hi!
I don't think it's possible to bind one table to multiple VOs. A binding uses one iterator (binding), and one iterator means one VO.
I understand that your transient VO is shown in the UI as a table.
The reason for the empty row is that TransientVO.reset() does not really reset the iterator, since the iterator binding immediately navigates the default RowSet iterator's currency back to the first row after the reset.
So if there's a binding on a VO, you can no longer reset the default iterator to the slot before the first row.
In order to populate your table in code, you should create a new RowSetIterator (which automatically is on the slot before the first row), then use that iterator to navigate over the rows, and then remove the RowSetIterator again.
Something like:
RowSetIterator transientIter = TransientVO.createRowSetIterator( null );
while( transientIter.hasNext() ) {
   transientVoRow = (InventoryGridTransVORowImpl)transientIter.next();
   // fill row
transientIter.closeRowSetIterator();Sascha