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| Mapping a JSON field |
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| Author |
Message
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| petervh1 |
 Posted: Wed Jul 06, 2022 5:38 am Post subject: Mapping a JSON field |
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Centurion
Joined: 19 Apr 2010
Posts: 132
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Hi
I have a basic question. Should be obvious, but I just can't find it.
I'm trying to determine whether a particular field in a JSON input message exists or not. The field is called ObjectID.
The Trace node shows the data as
| Code: |
(0x01000000:Object):JSON = ( ['json' : 0x7f66a1af8720]
(0x01000000:Object):Data = (
(0x01000000:Object):d = (
(0x01001000:Array):results = (
(0x01000000:Object):Item = (
(0x01000000:Object ):__metadata = (
(0x03000000:NameValue):uri = 'https://xxx('00163E1CA6AA1EE798907658744CED4F')' (CHARACTER)
(0x03000000:NameValue):type = 'cust.StoreRoot' (CHARACTER)
)
(0x03000000:NameValue):ObjectID = '00163E1CA6AA1EE798907658744CED4F' (CHARACTER)
) |
I even wrote the JSON structure to a queue and viewed it using RFHUTIL:
| Code: |
d.results.__metadata[1].uri="https:\/\/xxx\/xxx\/xxx\/xxx\/xxx\/xx\/xxx\/xxx('00163E1CA6AA1EE798907658744CED4F')"
d.results.__metadata[1].type="cust.StoreRoot"
d.results.,"ObjectID"[1]="00163E1CA6AA1EE798907658744CED4F" |
In my ESQL: I have:
| Code: |
| DECLARE ObjectIDExists BOOLEAN EXISTS(InputRoot.JSON.Data.d.results.",ObjectID".[]); |
I've tried numerous combinations but can't seem to match the field.
TIA |
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| abhi_thri |
| Posted: Wed Jul 06, 2022 10:55 pm Post subject: |
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Knight
Joined: 17 Jul 2017
Posts: 516
Location: UK
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hi...why is ',' appearing before 'ObjectIdD'?...is it part of the field name?
try the below and see...
| Code: |
| IF FIELDNAME(InputRoot.JSON.Data.d.results.ObjectID) IS NOT NULL |
or
| Code: |
| IF FIELDNAME(InputRoot.JSON.Data.d.results.",ObjectID") IS NOT NULL |
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| petervh1 |
| Posted: Wed Jul 06, 2022 11:06 pm Post subject: |
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Centurion
Joined: 19 Apr 2010
Posts: 132
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I was also surprised to see the ',' in the RFHUTIL representation. It's definitely there - not a typo on my part.
I ignored that, and coded as per your first suggestion and it worked.
Thanks |
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| timber |
| Posted: Thu Jul 07, 2022 4:59 am Post subject: |
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Grand Master
Joined: 25 Aug 2015
Posts: 1290
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This should also work, and may be a little easier to remember:
| Code: |
IF EXISTS(InputRoot.JSON.Data.d.results.ObjectID[])
...
END IF
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Don't forget the [] after the field reference - the EXISTS function only works with arrays. |
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| missing_link |
| Posted: Fri Jul 08, 2022 7:10 am Post subject: |
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Acolyte
Joined: 08 Jan 2004
Posts: 60
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| (Long time since I've been here) - but glad i saw this post earlier...seeing the exact same thing with comma's in the RFHUtil JSON view, which made think wha... for minute. Must just be the way it representing the JSON Output. |
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