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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » I need some help with the syntax for a CARDINALITY array

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jrsetters
PostPosted: Thu Feb 28, 2013 8:22 am    Post subject: Reply with quote

Acolyte

Joined: 24 Aug 2011
Posts: 72
Location: Cincinnati, OH
adubya wrote:
Cool.

Lots of our production flows have "unresolvable field reference" warnings


I learn something new every year.
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rekarm01
PostPosted: Thu Feb 28, 2013 7:11 pm    Post subject: Re: I need some help with the syntax for a CARDINALITY array Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 1415
mqjeff wrote:
You should never write your own code that uses CARDINALITY unless you actually need to know the literal count and use that as a specific individual value.

You should always write any kind of loop in ESQL using a reference variable and MOVE and LASTMOVE to confirm you should continue iterating.

It's an immense improvement in performance, and is the recommended practice.

Maybe that's overstated a bit. Sometimes, the performance improvement is not all that immense.

The often overlooked FOR statement may be better suited for iterating through an array; the reference variable, MOVE, and LASTMOVE are built-in. (Although the "correlation_name AS field_reference" syntax seems a bit backward, compared to how "AS" works elsewhere.)
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