How to modify the pre generated SQL string in Db adapter

Question

Hello All,
I am using a DB adapter to poll a database. So in the configuration of adapter, i have specified the option of logical delete, i want to update to a field PF as 'Y'. In my BPEL process, I want to update those records as 'Y' for their process_Completion field after i am done doing logic on those records.. Actually in the database adapter configuration, we get the SQL string right ?. So inorder to edit that SQL how should we go ahead ?
I mean i want to poll the database, i want to get like 1000 records for my BPEL Process Instance, and after all those 1000 gets processed and completed. Iwant to get the next 1000. So i want to write a query something like...
select seqid, id, field1, field2..... from STable a where a.PF = 'N' and exists(select 1 from STable b where b.seqid = a.seqid - 1 and b.PF = 'Y' and b.process_Completion = 'Y')
So, how to write my custom quesries while polling the database. cant we write custom quesries while we are doing Inbound operation with Dbadapter. Please help me with this thing.
Thanks,
N

Answer 1

Whenever you use a JCA DB Adapter in JDeveloper it creates an OR mapping xml that contains the select/polling query that you might have.
Below is an example of one such query. You can edit the sql here manually and redeploy your process.
<querying xsi:type="query-policy">
<queries>
<query name="DBConnSelect" xsi:type="read-all-query">
<call xsi:type="sql-call">
<sql>SELECT MESSAGE_ID,BU_ID,CREATED_BY FROM MESSAGE_BUFFER where BU_ID IN (3232,4747) and 3 > rownum</sql>
</call>
<reference-class>DBConn.MessageBuffer</reference-class>
<container xsi:type="list-container-policy">
<collection-type>java.util.Vector</collection-type>
</container>
</query>
</queries>
In case you need to add parameters to your query you should be able to do that as well while you are creating your DB Adapter.
Edited by: Arun Pareek on Jun 15, 2011 9:34 AM