How to Create a record if vo.executequery does not return any rows

Question

I would like to update a single record on adf form. However if the record does not exist would like to create a row and save it in the table.
The user does not want to add a "create" button on the screen. Hence would need to add the create code if vo.execute does not return any rows...
How to add this and where to add?

Answer 1

you can have a TF router for for exists and does not exist and based on that execute transient VO and other VO.
Add a method call activity like below to create a row in transient VO
public Row createRow()
ViewObjectImpl tVO = (ViewObjectImpl)getTVO();
tVO.executeEmptyRowSet();
Row newRow = tVO.createRow();
tVO.setCurrentRow(newRow);
tVO.insertRow(newRow);
return newRow;
}