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Resolved Datastore exportjson

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  1. Eric Verhorstert
    Eric Verhorstert
  2. PowerBuilder
  3. Tuesday, 2 January 2024 08:37 AM UTC

Powerbuilder 2022R2

If a column in a datawindows is destroyed I see a empty column ( "": null ) in the json export

Is there a way to avoid this?

Thanks

Eric

 

Simplified code:

lds.dataobject = 'dw_line'
lds.modify("destroy column cs_key")
lds.settransobject( sqlca )
lds.retrieve( )
lds.exportjson( false )

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Responses (3)
Eric Verhorstert
Eric Verhorstert Accepted Answer Pending Moderation
  1. Tuesday, 9 January 2024 09:21 AM UTC
  2. PowerBuilder
  3. # 1

Solved it by changing the order of the columns and export the data using parameter startcolumn

Comment
Armeen Mazda @Appeon
  1. Armeen Mazda @Appeon
  2. Tuesday, 9 January 2024 18:40 PM UTC
Thanks for sharing the solution!
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Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Thursday, 4 January 2024 14:32 PM UTC
  2. PowerBuilder
  3. # 2

Sounds like a possible bug.

Can you not simple search and replace "( "": null )" with "" ?

 

Comment
Eric Verhorstert
  1. Eric Verhorstert
  2. Thursday, 4 January 2024 15:15 PM UTC
Great idea. But, string handling is not the best part of Powerbuilder. Replacing 3 strings per line in 10000 lines might give a performance problem. I normally use the Chilkat stringbuilder object for string handling because of the speed and possibilities. But, in this case I am not able to use it. Lets try and see what happens.

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Miguel Leeuwe
  1. Miguel Leeuwe
  2. Thursday, 4 January 2024 15:56 PM UTC
you're right. Powerbuilder is horrible at string manipulations, but you could:

1. Use Blob variables and functions like BlobMid which will speed up things (Roland Smith on Topwizprogramming has some great code for that).

2. Or even better: Create a C# DLL to do the string manipulations and import it into a PB nvo.
  1. Helpful
Miguel Leeuwe
  1. Miguel Leeuwe
  2. Friday, 5 January 2024 13:04 PM UTC
Eric,

Here's a link you might be interested in: https://community.appeon.com/index.php/qna/q-a/use-c-for-replace-function

It includes a little sample application.
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Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Tuesday, 2 January 2024 12:14 PM UTC
  2. PowerBuilder
  3. # 3

Hi Eric;

  Suggestion: Have you also tryed amending the DWO's SQL to drop the column in question before the Retrieve()?

Regards ... Chris 

Comment
Eric Verhorstert
  1. Eric Verhorstert
  2. Thursday, 4 January 2024 13:57 PM UTC
Hello Chris,



If I change the SQL statement in the SQLpreview event nothing is returned anymore. Probably the only solotion is to except that we need to have a copy of the dw's to handle the columns we want in the json. Also checked if it was possible to delete a item in the json but could not find anything.



Thanks

Eric
  1. Helpful
Chris Pollach @Appeon
  1. Chris Pollach @Appeon
  2. Thursday, 4 January 2024 18:10 PM UTC
Hi Eric;

Yes, if the dynamic SQL changes do not meeting your processing challenge, then multiple tailored DWO's would be the next best thing.

Regards ... Chris
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