java - What is the difference between OrderItemAddCmd vs. OrderItemUpdateCmd? -

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for ibm's websphere commerce, distinguishing differences between these 2 commands? share orderitembasecmd , lot of same things.

from documentation on orderitemupdate:

"this command can orderitemadd command can do. in addition, can update products , items in existing order list.".

http://pic.dhe.ibm.com/infocenter/wchelp/v7r0m0/index.jsp?topic=%2fcom.ibm.commerce.developer.doc%2frefs%2frosorderitemupdate.htm


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