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Changing namespaces during runtime ?

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my_mqmb

Posted: Mon Jun 16, 2014 2:27 am Post subject: Changing namespaces during runtime ?

Voyager

Joined: 08 Jun 2011
Posts: 84

I want to change the namespace prefix in a line of esql code dynamically based on some condition.

for eg :

Code:

DECLARE top1 NAMESPACE 'http://lto.com/dis/schemas/issuerinterface1.0';

DECLARE top NAMESPACE 'InterfaceServiceV1.0.4';

-- sometimes i want my output to go like --

SET OutputRoot.XMLNSC.top:createRequest.requestUID= Environment.Variables.RqstUID ;

-- and sometimes the output to go like --

SET OutputRoot.XMLNSC.top1:createRequest.requestUID= Environment.Variables.RqstUID ;

based on a condition how can i switch top or top1 and make the xmlnsc parser switch the prefixes .

Esa

Posted: Mon Jun 16, 2014 2:50 am Post subject:

Grand Master

Joined: 22 May 2008
Posts: 1387
Location: Finland

A prefix is just a shorthand. In fact you need to change the namespace. The prefix will follow, if you have added the namespace declaration. Otherwise you get a prefix like 'NS1'.

Code:

SET OutputRoot.XMLNSC.top1:createRequest.requestUID= Environment.Variables.RqstUID ;

SET OutputRoot.XMLNSC.top1:createRequest NAMESPACE = top;

my_mqmb

Posted: Mon Jun 16, 2014 3:21 am Post subject:

Voyager

Joined: 08 Jun 2011
Posts: 84

I thing i dint explain properly .

say that i have 100 lines of code .

Based on some condition i need to just switch to other namespace in the output . so i dont want to make it 200 lines of code.

i need my esql to select between top and top1 dynamically ..

something like
IF condition
SET dynamic = top ;
ELSE
SET dynamic = top1 ;
END iF;

SET outputroot.XMLNSC.{dynamic}:createRequest.requestUID

How to achieve something like above ?

fjb_saper

Posted: Mon Jun 16, 2014 4:46 am Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20697
Location: LI,NY

my_mqmb wrote:

So how about

Code:

DECLARE top1 NAMESPACE 'http://lto.com/dis/schemas/issuerinterface1.0';

DECLARE top NAMESPACE 'urn:InterfaceServiceV1.0.4';

DECLARE dynamic NAMESPACE top1;

IF condition
SET dynamic = top ;
ELSE
SET dynamic = top1 ;
END iF;

SET outputroot.XMLNSC.{dynamic}:createRequest.requestUID

Have you tried this and did it work?

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MQ & Broker admin

Esa

Posted: Mon Jun 16, 2014 4:58 am Post subject:

Grand Master

Joined: 22 May 2008
Posts: 1387
Location: Finland

fjb_saper wrote:

So how about

Code:

Have you tried this and did it work?

If it doesn't work, replace the last line with this and test again:

Code:

SET OutputRoot.XMLNSC.dynamic:createRequest.requestUID

And it's not the spelling of OutputRoot that is the point, but the omission of curly braces.

fjb_saper

Posted: Mon Jun 16, 2014 5:09 am Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20697
Location: LI,NY

Esa wrote:

And it's not the spelling of OutputRoot that is the point, but the omission of curly braces.

That'll teach me to check after cut and paste

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MQ & Broker admin

my_mqmb

Posted: Mon Jun 16, 2014 6:17 am Post subject:

Voyager

Joined: 08 Jun 2011
Posts: 84

[quote="fjb_saper"]

Esa wrote:

And it's not the spelling of OutputRoot that is the point, but the omission of curly braces.

My code output :

<NS1:createRequest xmlns:NS1="dex1"> <requestUID>66</requestUID></NS1:createRequest>

Suggested code output :

<NS1:createRequest xmlns:NS1="ReqNamespace"> <requestUID>66</requestUID></NS1:createRequest>

What i need :

<NS1:createRequest><requestUID>66</requestUID></NS1:createRequest>

where NS1 ( sent by broker) has either http://lto.com/dis/schemas/issuerinterface1.0 ( top1) or InterfaceServiceV1.0.4 (top)

i dont need the attribute data.

Esa

Posted: Mon Jun 16, 2014 6:47 am Post subject:

Grand Master

Joined: 22 May 2008
Posts: 1387
Location: Finland

my_mqmb wrote:

i dont need the attribute data.

If you by "attribute data" mean XML declarations, you do need them. If you don't create them yourself where you want them to be placed, the parser will generate them where it thinks is the proper place.

Search this forum for "DoubleNamespaceDeclaration".

fjb_saper

Posted: Mon Jun 16, 2014 7:28 am Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20697
Location: LI,NY

Esa wrote:

my_mqmb wrote:

i dont need the attribute data.

And if you don't create the xml namespace declaration in your output tree, the broker may decide to give a different namespace prefix to every occurrence, with the corresponding namespace declaration (exemple xsi:nil = "true").
If xsi has not been declared (xml namespace declaration) the broker will create a different namespace prefix for each occurrence of xsi...

So better remember your xml namespace declarations in your documents at the start of the document... You can still do them once you are done creating the message tree... Just add it to the finished message tree at the appropriate level ... preferably as first child?

Have fun

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MQ & Broker admin

kimbert

Posted: Mon Jun 16, 2014 7:43 am Post subject:

Jedi Council

Joined: 29 Jul 2003
Posts: 5542
Location: Southampton

I think it's time to summarize the problem and the solution. Thanks go to mgk for providing the answer.

Requirement: In an ESQL field reference, use a variable where the namespace constant usually appears.
Example:

Code:

Set OutputRoot.XMLNSC.nsA_or_nsB:root.field1 = '';

where 'prefixAorPrefixB' has been initialised to point to either of two alternative namespaces.

Solution:
- Declare both NAMESPACE constants in the usual way
- Declare a CHARACTER variable '
- SET the CHARACTER variable from either of the two NAMESPACE constants.
- In the field reference, use the CHARACTER variable in {} to specify the namespace.

Code:

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Before you criticize someone, walk a mile in their shoes. That way you're a mile away, and you have their shoes too.

Esa

Posted: Mon Jun 16, 2014 11:37 pm Post subject:

Grand Master

Joined: 22 May 2008
Posts: 1387
Location: Finland

Interesting to see that you can handle namespaces as if they were CHAR variables.

This works, too:

Code:

DECLARE top1 NAMESPACE 'http://lto.com/dis/schemas/issuerinterface1.0';
DECLARE top NAMESPACE 'urn:InterfaceServiceV1.0.4';
DECLARE dynamic CHARACTER;

IF condition
SET dynamic = top;
ELSE
SET dynamic = top1 ;
END IF;

DECLARE outRef REFERENCE TO OutputRoot;
CREATE LASTCHILD OF outRef AS outRef DOMAIN('XMLNSC');
CREATE LASTCHILD OF outRef.XMLNSC AS outRef NAMESPACE dynamic NAME 'createRequest';
SET outRef.requestUID = <something>;

if you prefer to build the output message using reference variables.

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