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| ram_s |
 Posted: Thu Mar 26, 2009 4:49 am Post subject: Global transaction with DB2 and MQ |
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Newbie
Joined: 26 Mar 2009
Posts: 3
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We have an MDB which picks message from a queueA , calls a stored procedure to do business logic and finally sends a response message to queueB .
Since database as well as Queue are involved, the MDB runs with a transaction type set to "Required" in a container managed transaction.
Given this, there is a specific condition which we are not able to achieve. In case of any business error returned by stored proc (Ex: Customer is invalid) then we have to intimate this error by sending a error message to the response queue. At the same time any database operations (inserts/updates) performed have to be rolledback.
The requirement is : In case of business errors, MDB has to write to a queue but within global transaction
We tried 2 options:
1. In case of business error, if we do a setRollbackOnly() the database and the request messages also gets rolledback.
2. We tired using SAVEPOINTS in the stored proc and do a Rollback to Savepoint in case of business errors. In this case it gives an exception that, Savepoint cannot be used in a Global transaction.
Can anyone help as to how to do this. I am using WAS6.0 and DB2 as database. |
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| WMBDEV1 |
| Posted: Thu Mar 26, 2009 5:06 am Post subject: |
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Sentinel
Joined: 05 Mar 2009
Posts: 888
Location: UK
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| Are you using CMP or BMP? I think to achieve this, you have to use BMP. |
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| ram_s |
| Posted: Thu Mar 26, 2009 5:19 am Post subject: |
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Newbie
Joined: 26 Mar 2009
Posts: 3
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| Entity beans are not used. Instead, the MDB calls a stored procedure in DB2 using JDBC. |
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| WMBDEV1 |
| Posted: Thu Mar 26, 2009 5:46 am Post subject: |
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Sentinel
Joined: 05 Mar 2009
Posts: 888
Location: UK
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| You can still use BMP within MDBs. |
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| ram_s |
| Posted: Thu Mar 26, 2009 6:02 am Post subject: |
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Newbie
Joined: 26 Mar 2009
Posts: 3
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The customer we are working isnt open to using BMPs since the existing methodology used is stored procedure thru jdbc.
Can we achive using this? |
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| WMBDEV1 |
| Posted: Thu Mar 26, 2009 6:53 am Post subject: |
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Sentinel
Joined: 05 Mar 2009
Posts: 888
Location: UK
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| You can achieve it by getting the DB to rollback (or perform a compensating transaction) its work within the stored procedure and then indicating to the MDB that its failed. |
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| fjb_saper |
| Posted: Thu Mar 26, 2009 3:11 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20768
Location: LI,NY
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It is very unclear to me what you are trying to achieve.
In case of a problem do you want to
- roll back DB2 but commit the MQ part with sending a message?
Not a real multiphase commit here...
- roll back DB2, roll back MQ and send a message (how many times will you send that message ? see bothresh
In my opinion this needs to be controlled with a number of different method and the transactionality on these methods needs to be set correctly...
Required vs Requires New etc...
Have fun 
_________________
MQ & Broker admin |
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