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| Recursive XML Parsing |
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| RAJESHRAMAKRISHNAN |
 Posted: Sat Oct 26, 2013 10:25 pm Post subject: Recursive XML Parsing |
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Voyager
Joined: 01 May 2004
Posts: 96
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Hello All
Have a requirement where I need to traverse through an XML that would be nested at each level. I need to traverse through all the levels. Have written a simple recursive procedure and it works fine. But I am afraid that a recursive logic can result in stack exception when parsing through an XML when the depth is high.
Can some one please point to alternate methods of achieving the same? Would like to do it in ESQL rather than Java.
Regards
Rajesh |
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| Simbu |
| Posted: Sun Oct 27, 2013 12:02 am Post subject: |
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Master
Joined: 17 Jun 2011
Posts: 289
Location: Tamil Nadu, India
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| dogorsy wrote: |
| kimbert wrote: |
| Check out the namespace sample - it contains some code that allows you to recursively walk a message tree and add/remove namespaces. |
Interesting sample, but there is an esql example that I like a lot better ( it is a recursive function ) and navigates the whole tree, the starting point is decided on the 1st call to it. Needs some changing to alter/add/remove namespaces, but nothing to complicated
The function is Navigate, can be found under CREATE PROCEDURE statement, esql example 2 |
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| mqsiuser |
| Posted: Sun Oct 27, 2013 2:16 pm Post subject: Re: Recursive XML Parsing |
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Yatiri
Joined: 15 Apr 2008
Posts: 637
Location: Germany
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Think about what a (recursive) function-call gives you:
It gives you the ability to pass in parameters as IN and INOUT and get a return OUT.
If you manage that yourself, then you will avoid the overhead that a function call creates and also the abend, that might occur when the function callstack becomes too deep (somewhere between 100 and 1000).
Just use loops and "move first child" 
Use simple variables (e.g. recDepth) and use the Environment/Input/Output-Trees for complex data.
For performance "implement your own recursion" (and don't (nessesarily) use function-call recursion). Consider function call recursion as an option (with drawbacks) and use and walk the message trees to base your processing on.
_________________
Just use REFERENCEs |
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| dogorsy |
| Posted: Mon Oct 28, 2013 12:42 am Post subject: |
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Knight
Joined: 13 Mar 2013
Posts: 553
Location: Home Office
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There is a recursive ESQL function documented in the control centre. look at CREATE procedure ESQL example 2
the function is called navigate. |
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| mqjeff |
| Posted: Mon Oct 28, 2013 1:46 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Here's the thing, though.
Tree walking only uses as much stack as the depth of the tree you're walking.
I've never seen an XML message that was very deep. Certainly very *wide*, lots of children all at the same level.
But I've never seen an XML message with, say, even 50 nested levels of child elements. Or, really, more than 10.
So unless you know for a fact that as your messages get bigger, they get more nested layers, you're probably okay using recursion. |
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