The Add or Update command for data imports using zohocreator.exe is described as follows

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Add Or Update

zohocreator.exe <filepath> <username> <password> -e <appname> -au <formname> <fieldname> <columnname>

Eg : zohocreator.exe c:\myfolder\ordermanagement.csv john mypassword -e order-management -au order_form Items Products

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Pls provide a quick summary of how this works as the command is unclear - would like to update a Products table with addition of new records (but only if the Product does not already exist)

Questions are..

1) What does <fieldname> <columnname> refer to? 

2) Is <columnname> the unique key in the target form? (eg unique Product id in my use case)

3) if the csv file contains 5 columns, do all 5 columns get updated in the target form (if the unique key exists) or is it just the <fieldname> that gets updated?

Thanks