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MQSeries.net Forum IndexWebSphere Message Broker SupportHow to set Timestamp multiple times in ESQL

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johkar
PostPosted: Sun Dec 04, 2016 9:44 am Post subject: How to set Timestamp multiple times in ESQL Reply with quote

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Joined: 27 Jan 2015
Posts: 16

The documentation for the ESQL keyword CURRENT_TIMESTAMP and CURRENT_TIME functions say that it retains the same value in the node/flow. I have a need within ESQL to set an updated timestamp from within a loop and then read it later in the flow.

Is there a way to set an updatable timestamp, or perhaps just Time in milliseconds, from ESQL?
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adubya
PostPosted: Sun Dec 04, 2016 11:32 am Post subject: Reply with quote

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Joined: 25 Aug 2011
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Location: GU12, UK

Write a Java class to return what you need and call that from ESQL ?
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timber
PostPosted: Sun Dec 04, 2016 11:57 am Post subject: Reply with quote

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Joined: 25 Aug 2015
Posts: 1033

Quote:
I have a need within ESQL to set an updated timestamp from within a loop and then read it later in the flow.
Can you explain what you want to do with this timestamp? That way, we can form our own conclusions about whether this is a genuine need. The more we know about the problem, the more likely we are to offer good advice.
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smdavies99
PostPosted: Sun Dec 04, 2016 12:06 pm Post subject: Reply with quote

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Location: Somewhere over the Rainbow this side of Never-never land.

adubya wrote:
Write a Java class to return what you need and call that from ESQL ?


Let me expand a little on this answer with an insight into why this is an answer.


The values returned with the CURRENT_TIMESTAMP and CURRENT_TIME are the same for the entire invocation of that COMPUTE NODE.

By this I mean that when a thread enters a COMPUTE NODE (ESQL) the values returned by these functions remains the same no matter how many times the function is called and how long the flow is executing the code in that COMPTUTE NODE.

If you really, really, really need a different time value for some reason then do as suggested, and create some Java to get the actual system time when you need it.

When I first encountered this I was puzzled as to why it was like this. It didn't seem logical but it wasn't a major issue.
A few years later, I used it to my advandage in a really complex envirnment. There was lots of propagation and use of a collector node. I used the output of CURRENT_TIMESTAMP as a collection identifier.
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Every time you reinvent the wheel the more square it gets (anon). If in doubt think and investigate before you ask silly questions.
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johkar
PostPosted: Sun Dec 04, 2016 7:40 pm Post subject: How to set Timestamp multiple times in ESQL Reply with quote

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Thanks adubya and smdavies99. I searched a bit and found the below link which I think outlines what I need to do. I'll need to consult with a teammate who is a Java developer but think we can get it easy enough.

http://www.ibm.com/support/knowledgecenter/SSMKHH_9.0.0/com.ibm.etools.mft.doc/ak04960_.htm
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adubya
PostPosted: Sun Dec 04, 2016 11:40 pm Post subject: Re: How to set Timestamp multiple times in ESQL Reply with quote

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johkar wrote:
Thanks adubya and smdavies99. I searched a bit and found the below link which I think outlines what I need to do. I'll need to consult with a teammate who is a Java developer but think we can get it easy enough.

http://www.ibm.com/support/knowledgecenter/SSMKHH_9.0.0/com.ibm.etools.mft.doc/ak04960_.htm


Yes, that's it. The documentation is good in that area and it's simple to create a Java class which you can associated with an ESQL FUNCTION specifying LANGUAGE JAVA.
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rekarm01
PostPosted: Mon Dec 05, 2016 10:31 am Post subject: Re: How to set Timestamp multiple times in ESQL Reply with quote

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Joined: 25 Jun 2008
Posts: 1372

johkar wrote:
The documentation for the ESQL keyword CURRENT_TIMESTAMP and CURRENT_TIME functions say that it retains the same value in the node/flow.

More specifically, within each invocation of a node, the current timestamp value remains constant, but it does change from node to node, and even for different invocations of the same node.

For example, if one esql node had a loop with PROPAGATE statement that invokes a second esql node, then for each iteration through the loop, the second esql node would have a different value for current timestamp.

That might be preferable to Java.
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Darth Vader
PostPosted: Fri Oct 04, 2019 4:13 am Post subject: How to set Timestamp multiple times in ESQL Reply with quote

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Joined: 04 Oct 2019
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I made a Java program which returns the Timestamp and included it in a shared library.
Then I wrote the Java routine procedure for the Java program.

When I'm trying to deploy both the Library and the application it's throwing a lot of errors
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timber
PostPosted: Fri Oct 04, 2019 6:15 am Post subject: Reply with quote

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Quote:
When I'm trying to deploy both the Library and the application it's throwing a lot of errors
Oh no! And we can't help, because we don't know what the errors are!

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gbaddeley
PostPosted: Sun Oct 06, 2019 2:39 pm Post subject: Re: How to set Timestamp multiple times in ESQL Reply with quote

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Joined: 25 Mar 2003
Posts: 2017
Location: Melbourne, Australia

johkar wrote:
The documentation for the ESQL keyword CURRENT_TIMESTAMP and CURRENT_TIME functions say that it retains the same value in the node/flow. I have a need within ESQL to set an updated timestamp from within a loop and then read it later in the flow.
Is there a way to set an updatable timestamp, or perhaps just Time in milliseconds, from ESQL?

Even if the timestamp is updatable and available at microsecond or nanosecond resolution, are duplicate timestamps going to cause any issues?

Are you using timestamp as a unique transaction identifier?
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mpong
PostPosted: Mon Oct 07, 2019 8:10 am Post subject: Reply with quote

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Joined: 22 Jan 2010
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I remember this, I had an issue reported by the developer who noticed IIB is writting same timestamp for multiple rows, we then figured out within loop he was updating multiple DB rows with current timestamp function
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rekarm01
PostPosted: Mon Oct 07, 2019 9:36 am Post subject: Re: How to set Timestamp multiple times in ESQL Reply with quote

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Joined: 25 Jun 2008
Posts: 1372

gbaddeley wrote:
johkar wrote:
The documentation for the ESQL keyword CURRENT_TIMESTAMP and CURRENT_TIME functions say that it retains the same value in the node/flow. I have a need within ESQL to set an updated timestamp from within a loop and then read it later in the flow.

Is there a way to set an updatable timestamp, or perhaps just Time in milliseconds, from ESQL?

Please note that this post is nearly three years old, and appears to have been resolved.

Darth Vader wrote:
I made a Java program which returns the Timestamp ... it's throwing a lot of errors

As explained previously, updating the ESQL timestamp may be preferable to using Java.
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