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| Referencing JSON Array Object Directly |
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Message
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| arun_ace |
 Posted: Mon Dec 18, 2023 9:48 am Post subject: Referencing JSON Array Object Directly |
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Newbie
Joined: 18 Dec 2023
Posts: 3
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Hello All, I am trying REFERENCE function to move the pointer to "ParentId" element which is inside ad Array object(Sets) someting like below, but unable to do it. When I use indexing it works, This ParentID can be in any index not restricted to 2nd object.
DECLARE rInMsgPID REFERENCE TO InputRoot.JSON.Data.Payload.Sets.['ParentID']; --> Doestnt work
DECLARE rInMsgPID REFERENCE TO InputRoot.JSON.Data.Payload.Sets.[2]; --> Works
{
"Payload": {
"Sets": [
{
"EmployeeID": {
"employee": "A08"
}
},
{
"ParentID": {
"Parent": "1",
"Son": "2",
"Sibling": "2"
}
},
{
"MemberId": {
"Member": "22",
"MemberName": "umar"
}
}
]
}
} |
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| fjb_saper |
| Posted: Tue Dec 19, 2023 5:22 am Post subject: Re: Referencing JSON Array Object Directly |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20767
Location: LI,NY
|
| arun_ace wrote: |
Hello All, I am trying REFERENCE function to move the pointer to "ParentId" element which is inside ad Array object(Sets) someting like below, but unable to do it. When I use indexing it works, This ParentID can be in any index not restricted to 2nd object.
| Code: |
DECLARE rInMsgPID REFERENCE TO InputRoot.JSON.Data.Payload.Sets.['ParentID']; --> Doestnt work
DECLARE rInMsgPID REFERENCE TO InputRoot.JSON.Data.Payload.Sets.[2]; --> Works
{
"Payload": {
"Sets": [
{
"EmployeeID": {
"employee": "A08"
}
},
{
"ParentID": {
"Parent": "1",
"Son": "2",
"Sibling": "2"
}
},
{
"MemberId": {
"Member": "22",
"MemberName": "umar"
}
}
]
}
} |
|
That's because you're not doing it right.
First you need to reference the first element:
| Code: |
DECLARE rInMsgPID REFERENCE TO InputRoot.JSON.Data.Payload.Sets.[1]
#Then you do what you need and move to the next sibling (from memory)
MOVE rInMsgPID NEXT SIBLING NAME TYPE; |
First you have to have a reference. Then you can move that reference which ever way you need: Parent, Sibling, FirstChild, LastChild, etc...
Hope this helps 
_________________
MQ & Broker admin |
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| mgk |
| Posted: Tue Dec 19, 2023 7:02 am Post subject: |
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Padawan
Joined: 31 Jul 2003
Posts: 1647
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If you look at the documentation you can see that the array syntax does not take a name: https://www.ibm.com/docs/en/app-connect/12.0?topic=reference-esql-field-overview
Due to the way the JSON parser domain creates the tree with an extra "Item" element to represent each array entry this can get a little tricky: https://www.ibm.com/docs/en/app-connect/12.0?topic=parsers-json-parser-domain
If you use a Trace Node and trace ${Root} you will see the shape of the tree that is built for your message with the "Item" element mentioned above
However, something like this should work:
| Code: |
DECLARE ref3 REFERENCE TO InputRoot.JSON.Data.Payload.Sets.[1];
X: WHILE LASTMOVE(ref3) DO
IF EXISTS(ref3.ParentID[]) THEN
LEAVE X;
END IF;
MOVE ref3 NEXTSIBLING;
END WHILE; |
I hope this helps.
_________________
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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