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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » What is the Java equivalent code to a ESQL DELETE statement?

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mlce
PostPosted: Wed Aug 15, 2007 8:06 am    Post subject: What is the Java equivalent code to a ESQL DELETE statement? Reply with quote

Newbie

Joined: 10 Jan 2007
Posts: 4
I have tried to find information on how to delete an element of a message tree in a Java Compute Node (WMB 6.0) to be able to reduce memory consumption when processing very large messages.

The closest I have found is the detach-method on MbElement but I can't figure out how and when the element in the underlying message tree actually is deleted.

Is is handled automatically (e.g. at GC) or do I need to do something else in my Java code?

Regards,
Magnus.
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jefflowrey
PostPosted: Wed Aug 15, 2007 8:38 am    Post subject: Reply with quote

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Joined: 16 Oct 2002
Posts: 19981
If you detach the MbElement, then it's removed from the message tree.

That means you have the only reference to it. You can set it to NULL, and it should get GC'd at some point.

I'm not sure quite what happens when you set an ATTACHED MbElement to null.

It's usually, in general, better not to create things than to delete them.

Also, don't forget clearMessage() on any new messages you create.
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