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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » How can i Get Index(Counter) variable in Mapping Node.

How can i Get Index(Counter) variable in Mapping Node.

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santosh.07131f0046

Posted: Mon Dec 07, 2015 3:35 am Post subject: How can i Get Index(Counter) variable in Mapping Node.

Newbie

Joined: 21 Feb 2012
Posts: 7

There was requirement of I need to send the Index Number(Occurrence count for each iteration) to the backend system but i didn't receive this from front end Channel.

How can i achieve this on Mapping Node on WMB version 8.0.Can some one please suggest.

martinb

Posted: Tue Dec 08, 2015 2:30 am Post subject:

Master

Joined: 09 Nov 2006
Posts: 210
Location: UK

In the Graphical Data Mapper there are several things that can help.

Assuming you are using a For each transform this provides the $VarName-index variable to indicate the index of the input array that the Graphical Data Mapping editor is processing.

In later fixpacks it also provides the $VarName-count variable to determine the number of times the Graphical Data Mapping editor enters the nested mapping to allow populating the output array.

Note if you have a filter expression on a for each, that might exclude some input iterations, hence the provision of both an input index and a "output" count variable.

Note these are only documented fully with examples in IIB v10 Knowledge Center. You can confirm if they are supported in your version by simply using "Ctrl-space" content assist to see if the variables are offered.
For each

Also since the Graphical Data Mapper supports XPath 2.0, you have access to functions like fn:count($var) to determine the count of instances of a repeating input element.

Hope that gets you up and running.[/url]

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