Entity Attribute Existence Check - Query Result Parameter not possible ?

Question

I already read the section of the ADF BC Developer Guide (9.6.2 Implementing an Efficient Existence Check).
That works and maybe is the best solution, however I am working with a group of Forms Developers which are much more comfortable with writing SQL statements.
Natural thing for them in this case was to define a declarative compare validator with the following Query Result:
select PROD_ID from Products where PROD_ID=:ProdId
where :ProdId is ServiceRequest.ProdId
Is this possible with ADF BC ?
Other possibility is to define a List Validator with the following Query Result:
select PROD_ID from Products
but this is not performant.
I know the programmatic approach is always possible, but to make migration easier for Forms developers into the ADF BC world, the declarative SQL option should be available.
Thanks,
Claudio.

Answer 1

This isn't possible out of the box in 10.1.3 since we don't support a mechanism to set the values of the bind variables. In 10.1.3, you would need to build a custom validation rule class (explained in section 26.9 "Implementing Custom Validation Rules") to make this declarative for others on your team.
I wouldn't recommend the list validator in 10.1.3 for anything but the most trivial uses. This is because it's current implementation retrieves all rows from the query, then does the attribute comparison in memory.
Among many, many other enhancements, we are greatly enhancing declarative business logic features of ADF Business Components for our 11g/Fusion release (the next major release), where this will be super-easy.