How to build a query across parent and child object fields?

Question

As a part of an Integration Requirement, I need to query Opportunity records that have been Modified after a specific date and time?
Now, Opportunity has a child object called ProductRevenue with a one to many relationship. Is there anyway I can construct a querypage that will fetch records whose Opportunity fields 'OR' its child ProductRevenue's fields have been modified after a specific date and time?
I have tried using the SearchSpec argument, but it does not let me query across child object fields.
For eg:-
ObjOpptyQueryPageInput.ListOfOpportunity.Opportunity.searchspec = "([ModifiedDate] > '01/01/2013 00:00:00') OR ([ProductRevenueData.ModifiedDate] >= '01/01/2013 00:00:00')";
[This above code written in C# thew me an error saying - The object Opportunity does not have an integration component called - ProductRevenueData.ModifiedDate.]
Any help will be greatly appreciated. Thank you.

Answer 1

Hi,
As far as I know this can't be done at once because you have to consider :
- Every Opportunity and their time-limited ProductRevenues
AND
- Time-limited Opportunities
If you want to achieve this, you have to consider the 2 datasets separately and make your first query :
ObjOpptyQueryPageInput.ListOfOpportunity.Opportunity.searchspec = "([ModifiedDate] >= '01/01/2013 00:00:00')";
but also another query with the restriction on the ProductRevenue Searchspec.
This shouldn't be too hard because the searchspec functionality is present at each level :
- ListOfOpportunity -> Opportunity (the top-level that you used for your query)
- ListOfOpportunity -> Opportunity -> ListOfProductRevenue -> ProductRevenue (the sub-level that you should use for the second query)
Then in your C# code, you merge the 2 datasets and you end up with your expected result.
Hope this helps,
Charles.
http://www.dubant.com