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MQSeries.net Forum IndexWebSphere Message Broker SupportAmending / Adding to a JSON array

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lonesheep
PostPosted: Fri Oct 12, 2018 5:21 am Post subject: Amending / Adding to a JSON array Reply with quote

Novice

Joined: 12 Sep 2017
Posts: 21

Given the following JSON strcuture, if I wanted to add another address to 'fred', any idea how I do it?



Level 1 {Array}

Firstname fred

Level 2
Address {Array}

Level 3
Building No 1
Street High Street

Level 3
Building No 2
Street Station Road



Firstname bob

Level 2
Address {Array}

Level 3
Building No 1
Street High Street



I'm assuming I need to get a reference to the JSON Array at Address {Level 2}, but I have no idea how to do this? I've used the following to check for the existance of the block, but I can't see to amend it.


IF EXISTS(SELECT ITEM NAME from refOutNamesArray.Item[] as NAME where NAME.Firstname = 'fred') = TRUE THEN

-- Add an address..
END IF;



To add the address I tried this...

DECLARE refName REFERENCE TO OutputRoot;

SET refName = THE (SELECT ITEM NAME from refOutNamesArray.Item[] as NAME where NAME.Firstname = 'fred';

DECLARE countAddress INT CARDINALITY(refName.Address.Item[]);
SET (refName.Address.Item[countAddress+1].Street = 'Another One';



Alias, not good. I can't see to find any information on how to do this online. Any ideas?
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Vitor
PostPosted: Fri Oct 12, 2018 5:57 am Post subject: Re: Amending / Adding to a JSON array Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 25310
Location: Ohio, USA

lonesheep wrote:
I'm assuming I need to get a reference to the JSON Array at Address {Level 2}, but I have no idea how to do this? I've used the following to check for the existance of the block, but I can't see to amend it.


IF EXISTS(SELECT ITEM NAME from refOutNamesArray.Item[] as NAME where NAME.Firstname = 'fred') = TRUE THEN

-- Add an address..
END IF;



If it was me, I'd do something like:

Code:


MOVE refName FIRSTCHILD refOutNamesArray NAME 'NAME';
WHILE LASTMOVE(refName) DO
  IF FIELDVALUE(refName) = 'fred' THEN;
    MOVE refAddress FIRSTCHILD NAME 'Address';
    CREATE NEXTSIBLING OF refAddress AS refAddress;
    SET refAddress.<etc, etc>
  END IF;
  MOVE refName NEXTSIBLING;
END DO;


All code untested, posted as-is with no liability express or implied accepted for any loss or damage howsoever caused and on the understanding I've had so very much coffee this morning.


lonesheep wrote:

To add the address I tried this...

DECLARE refName REFERENCE TO OutputRoot;

SET refName = THE (SELECT ITEM NAME from refOutNamesArray.Item[] as NAME where NAME.Firstname = 'fred';

DECLARE countAddress INT CARDINALITY(refName.Address.Item[]);
SET (refName.Address.Item[countAddress+1].Street = 'Another One';



Never use CARDINALITY.
_________________
Honesty is the best policy.
Insanity is the best defence.
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