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Message
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| Prashanth007 |
 Posted: Sun Oct 18, 2015 1:37 am Post subject: Query on esql |
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Newbie
Joined: 13 Oct 2015
Posts: 6
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Hi all,
I have a query regarding an esql. i wrote this code in my compute node:
CREATE COMPUTE MODULE Task_flow_Compute
CREATE FUNCTION Main() RETURNS BOOLEAN
BEGIN
CALL CopyMessageHeaders();
CALL CopyEntireMessage();
RETURN TRUE;
END;
--
CREATE PROCEDURE CopyMessageHeaders() BEGIN
DECLARE I INTEGER 1;
DECLARE J INTEGER;
SET J = CARDINALITY(InputRoot.*[]);
WHILE I < J DO
SET OutputRoot.*[I] = InputRoot.*[I];
SET I = I + 1;
END WHILE;
END;
CREATE PROCEDURE CopyEntireMessage() BEGIN
if condition then
if condition then
Statements;
else
return false;
end if;
elseif condition then
statements;
end if;
END;
END MODULE;
this is my code,when deploying my flow with this code
it is not deploying due to syntax error at return false.So i came to know that
return false will not work under procedure.my requirement is the message has to
discard/stop with in the compute node in procedure itself.
CAn you please help me in this query?
thank you. |
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| nelson |
| Posted: Sun Oct 18, 2015 7:19 am Post subject: |
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Partisan
Joined: 02 Oct 2012
Posts: 313
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| smdavies99 |
| Posted: Sun Oct 18, 2015 8:23 am Post subject: Re: Query on esql |
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Jedi Council
Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.
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| Prashanth007 wrote: |
| Code: |
CREATE PROCEDURE CopyEntireMessage() BEGIN
if condition then
if condition then
Statements;
else
return false;
end if;
elseif condition then
statements;
end if;
END;
END MODULE;
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You can't use the RETURN statement in an ESQL PROCEDURE.
It is only valid in a FUNCTION
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| mgk |
| Posted: Sun Oct 18, 2015 10:56 am Post subject: |
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Padawan
Joined: 31 Jul 2003
Posts: 1647
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| Quote: |
| You can't use the RETURN statement in an ESQL PROCEDURE. It is only valid in a FUNCTION |
Almost  . PROCEDUREs can have a RETURNS clause as can FUNCTIONs and the RETURN statement must match the signature of the routine in which it is used. From the docs:
| Quote: |
| "When used in a function or a procedure, the RETURN statement stops processing of that function and returns control to the calling expression. The expression, which must be present if the function or procedure has been declared with a RETURNS clause, is evaluated and acts as the return value of the function. The data type of the returned value must be the same as that in the function's declaration" |
http://www-01.ibm.com/support/knowledgecenter/SSMKHH_10.0.0/com.ibm.etools.mft.doc/ak05130_.htm?lang=en.
So in this case, using RETURN is fine, but it should not have an expression to RETURN, so remove the "false".
Kind regards,
_________________
MGK
The postings I make on this site are my own and don't necessarily represent IBM's positions, strategies or opinions. |
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| Prashanth007 |
| Posted: Sun Oct 18, 2015 7:39 pm Post subject: query |
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Newbie
Joined: 13 Oct 2015
Posts: 6
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thanks all,
I have already executed this code in main() function but I want to execute the same code in procedure. But I don't know how to discard/stop my message with in procedure(like return false; in main()). So can you please suggest me how?
Thanks in advance. |
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| nelson |
| Posted: Sun Oct 18, 2015 8:54 pm Post subject: Re: query |
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Partisan
Joined: 02 Oct 2012
Posts: 313
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| Prashanth007 wrote: |
thanks all,
I have already executed this code in main() function but I want to execute the same code in procedure. But I don't know how to discard/stop my message with in procedure(like return false; in main()). So can you please suggest me how?
Thanks in advance. |
| mgk wrote: |
| So in this case, using RETURN is fine, but it should not have an expression to RETURN, so remove the "false". |
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| Prashanth007 |
| Posted: Sun Oct 18, 2015 9:18 pm Post subject: |
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Newbie
Joined: 13 Oct 2015
Posts: 6
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Thank you,
Return is working when removal of false in my statement.but the count of output queue is increasing.my requirement is I have to terminate the message in compute node itself in else condition.And the message should not go to output queue.
thanks in advance |
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| smdavies99 |
| Posted: Sun Oct 18, 2015 9:36 pm Post subject: |
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Jedi Council
Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.
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Change your procedure to a FUNCTION (returns BOOLEAN) and do a
RETURN TRUE
or
RETURN FALSE
at every exit point.
Then call is using something like
| Code: |
return MY_FUNCTION();
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This calls your function and then exits the calling ESQL code with the value used in the return statement on the Function.
Problem solved!
_________________
WMQ User since 1999
MQSI/WBI/WMB/'Thingy' User since 2002
Linux user since 1995
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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| stoney |
| Posted: Sun Oct 18, 2015 9:37 pm Post subject: |
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Centurion
Joined: 03 Apr 2013
Posts: 140
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| Change the procedure into a function that returns a boolean value indicating whether or not the message should be propagated, and then use that return value in the main() function? |
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| Prashanth007 |
| Posted: Sun Oct 18, 2015 10:05 pm Post subject: |
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Newbie
Joined: 13 Oct 2015
Posts: 6
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Thank you all,
But my requirement is I should do this in procedure itself.
I have to terminate the message in procedure.
And one more question that is Ho will i convert procedure into function?
Last edited by Prashanth007 on Sun Oct 18, 2015 10:41 pm; edited 1 time in total |
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| smdavies99 |
| Posted: Sun Oct 18, 2015 10:41 pm Post subject: |
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Jedi Council
Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.
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| Prashanth007 wrote: |
Thank you all,
But my requirement is I should do this in procedure itself.
I have to terminate the message in procedure. |
Why?
Why would a requirement be written as to force you into things that are not best practice (or even possible). The only way I know to terminate the message process int a procedure or function is to use a THROW statement but that will cause other things to happen that might bery well not meet your requirement.
You really need to go back to whoever wrote the requirement and tell them that what they want is not possible and that they must let you terminate processing in a way that is considered best practice with this product. And is also much more maintainable ....
Sometimes I get the impression that a lot of requirements are written by so called experts who have little of no experience with this product.
Please read this thread
www.mqseries.net/phpBB2/viewtopic.php?t=63535
_________________
WMQ User since 1999
MQSI/WBI/WMB/'Thingy' User since 2002
Linux user since 1995
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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| mqjeff |
| Posted: Mon Oct 19, 2015 1:44 pm Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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So what you want to do is, at some point in your code (inside a procedure or any other random location) cause a message to be sent out of a terminal.
And in the main function, you want to make sure it doesn't send out a message to any terminal.
This is eminently doable, if you use the correct ESQL statements to do both of those tasks.
Also, you should reexamine how you are starting your main routine, and what effect that is having on the output message.
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