Oracle BPEL Database Adapater - Passing the whole SQL itself as Parameter to DBAdapter

 Hi

I  need to create a BPEL process in such a way that whole sql Query should be a paramater.  How to acheive this scenario? Is that possible using DB Adapater in BPEL 11g?

Scenario

I have a select query "select * from tablename" . this query should be passed to db adapter using an assign activity.

What Operation type i need to use 

* call a stored procedure or function

* Perform an operation on table

     Insert Or update

     insert only

     Update only

     delete 

     select

     Query by example

* Poll for new or changed records in a table.

* execute pure sql