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MQSeries.net Forum IndexIBM MQ Java / JMSTransactions in MQSeries

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tomtran
PostPosted: Tue Oct 16, 2001 4:21 pm Post subject: Reply with quote

Newbie

Joined: 15 Oct 2001
Posts: 4

I'm using Java MQSeries classes v5.2 and am a little confused about MQSeries transaction support.

Does anyone know how to use MQQueueManager.begin() for transactions? If you call this method, do you still need to set synchpoint options on gets and puts? Does anyone have a sample of the proper way to do a two-phase commit (do a get from 1 queue, and a put to another queue in 1 transaction)? Are Transactions only supported if you are in bindings mode? Is there any way to do transactions if the client is remote from the MQSeries server?

Thank you.
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EddieA
PostPosted: Wed Oct 17, 2001 5:38 am Post subject: Reply with quote

Jedi

Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles

Hi,

If you only want to co-ordinate MQ messages, then you don not need MQQueueManager.begin(). If fact, that might even throw an exception (under other APIs, it returns a warning). It is used for co-ordinating MQ messages with database operations.

All you need do is use the MQC.MQxMO_SYNCPOINT option in the relevent MQGetMessageOptions or MQPutMessageOptions on the 1st MQ operation.

Here's a snippet from the Application Programmers guide:

Queue-manager-coordinated local unit of work.

This is a unit of work in which the queue manager is the only resource manager participating, and so the queue manager acts as the unit-of-work coordinator.

To start this type of unit of work, the MQPMO_SYNCPOINT or MQGMO_SYNCPOINT option should be specified on the first MQPUT , MQPUT1 , or MQGET call in the unit of work.

It is not necessary for the application to issue the MQBEGIN call to start the unit of work, but if MQBEGIN is used, the call completes with MQCC_WARNING and reason code MQRC_NO_EXTERNAL_PARTICIPANTS.

To commit or back out this type of unit of work, the MQCMIT or MQBACK call must be used.

Cheers.

_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0
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