Can we put multiple Database Polling within the asynchronous process

Question

Hi,
Can we put multiple Database polling within the the same asynchronous BPEL process.
There will be multiple Receive activities to receive the data from the poller.
Saptarishi

Answer 1

Hi Peter,
I am using 10.1.3.4 and cannot use ESB/mediator.
For the 2nd option,
I have tried to put multiple receive's to poll data from a table but it does not work(it waits at the 2nd Receive). Let me try to elaborate the issue a bit.
I have created a table for polling.
The table has 3 columns :- transaction_id, status, is_read
is_read is kept to implement the logical delete strategy of DB polling.
What I need to do is to maintain a single instance of BPEL to maintain a transaction(which is uniquely identified by transaction_id).
The BPEL should track the different stages of the transaction, i.e whenever a new row is inserted in the table with the updated status for a transaction, it must find the correct instance(by co-relating the transaction_id) and go to the next step (wait for the next receive activity) until all the steps of the transaction is completed.
In the code, I created a correlation set consisting of transaction_id(only). The property transaction_id has an alias to the inbound variable's payload.
In the first Receive, I checked the "create instance" checkbox. Also the correlation set is initialized.
From next Receive onwards the correlation set is checked.
The polling frequency is 5 secs.
The first Receive works fine and the process is instantiated. But it waits at the 2nd Receive indefinitely.
It will be very helpful if you can try this once. If you feel this is not the right approach, please guide me.
Thanks and Regards,
Saptarishi