JPA - difficulty deleting rows (with child fkeys)

[J.V.]

I have a parent table and want to delete a row but it has 'child' tables 
with foreign keys pointing to the primary key in the parent table.

We support four DBMS (Oracle, MySQL, PostgreSQL, SQL Server) and are 
adding more.

The table structure is such that the child tables have child tables and 
so on, probably if you follow it, 15 tables in all need a row deleted to 
just delete a row in a parent table.

I need a database agnostic way to 'delete cascade' a row, even if the 
table was not created with this option. In other words the framework 
would recursively find the leaf rows, delete those first and then work 
it's way up to the parent table and report any problems or throw an 
exception if this were the case.

I am looking for any/all solutions from anyone who has actually done 
this and was able to get it to work on multiple databases or any of the 
databases listed above.

thanks


J.V.