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| Header Node: Mixing MQ constant and XPATH |
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| Seb |
 Posted: Fri Mar 27, 2009 6:22 am Post subject: Header Node: Mixing MQ constant and XPATH |
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Apprentice
Joined: 27 Mar 2009
Posts: 41
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Hi,
I have an issue regarding the Header Nodes and the cominbed use of XPath and MQMD constants. I want to set the MQMD Expiry to the value of $Environment/Variables/ConfigRecords/LOG_EXPIRY or to MQEI_UNLIMITED if the XPath evaluates to NULL. So the question is, how would I realise this, as for example with the COALESCE function in ESQL?
Thanks in advance! |
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| rekarm01 |
| Posted: Sun Mar 29, 2009 4:36 pm Post subject: Re: Header Node: Mixing MQ constant and XPATH |
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Grand Master
Joined: 25 Jun 2008
Posts: 1415
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| ESQL doesn't support XPath; however, it does provide much of the same functionality with the SELECT and THE functions. |
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| Seb |
| Posted: Mon Mar 30, 2009 1:57 am Post subject: |
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Apprentice
Joined: 27 Mar 2009
Posts: 41
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Hi rekarm01,
my question was not if I can use XPath with ESQL, but rather if I can combine XPath and MQ constants in the properties fields of the MQ Header Node.
I have several SubFlows where one SF retrieves flow configuration data from a database. The other SFs are then controlled with these parameters. In my Logging SF, I use a MQ Header Node to adapt the log message before it is written. The rule is, if there is a LOG_EXPIRY set in the Environment than take it, otherwise put the message with UNLIMITED.
If I set this rule in the Compute Node of the Config SF, it would apply to all other subflows. My other option would be in the Logging SF to take the parameter from the environment, if it is available or set it to UNLIMITED or sth. else if not. That would result in a bit more flexibility. Now, can I do this in the Header Node or do I have to use the COALESCE function within a Compute Node?
Thanks again! |
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