Do While Example (d360)?

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Geoff

• January 29, 2021 15:07

are there any good examples for the Do While loop node? Is it still using BRAIN script?

Basically I have a list of data (24 rows) and I need to perform a function on each row (creating a file, uploading to an FTP, etc) then moving on to the next one.. The help page still shows brainscript so I was hoping there was a sample with python?

Thanks!

 

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  Gerard Cafaro

  • February 01, 2021 15:53

  Node examples are found within the product's installation directory:
  
  <install home>/docs/samples/nodes/

  These are standard LNA files (data flow exports) that can be imported. There's around 70 or so examples, which include the Do While node.. 

  Also, within the in-product help, there's a walkthrough of how the Do While node works. You can access this by:

  1. Drag and drop the Do While node to the canvas
  2. Click on the node, and within its properties pane near the top, look for Type: Do While  and click the hyperlink to your local doc

  The above steps can also be performed on other nodes for more detailed information. 

   

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  Geoff

  • February 01, 2021 17:37
  • Edited

  I dont think i can access that folder.. im checking. But I asked because the sample that it points to, uses Brainscript...

  UPDATE: i found the samples, and these also still use brain script... is this correct? Shouldnt these have been updated like other nodes?

  # Set condition to true on the first pass
  if (firstExec) then condition = true
  
  #Increment count by 1
  emit 'count' + 1 as count
  			
  # check if the condition is matched
  condition = condition and (20 > 'count')
  			
  # After all records are processed, check if the condition is still true.
  if (lastInGroup and condition) then {
  	# If the condition is still true, set returnCode 101 to	
  	# reschedule the node and continue iteration.
  	setSuccessReturnCode(101)
  }
  
  

   

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  Adrian Williams

  • February 02, 2021 16:30
  • Edited

  Unfortunately, the Do While and Do While Conditional nodes still require the use of the legacy scripting language rather than Python.

  You can however include Python-based nodes in nodes that are within the loop.

  The attached data flow provides equivalent examples that utilize current nodes instead of the Superseded nodes in nodes in the loop.

   

   

  Attached files

  Example Do While Nodes - 2 Feb 2021.lna

   

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  Adrian Williams

  • February 02, 2021 16:22

  You can also use looping constructs within a Transform node to perform some repeated actions.

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