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From Roshni Rajagopal <>
Subject Data Modelling Suggestions
Date Thu, 23 Aug 2012 10:26:50 GMT

Need some help on a data modelling question. We're using Hector & Datastax Enterprise

I want to associate a list of items for a user. It should be sorted on the time added. And
items can be updated (quantity of the item can be changed), and items can be deleted.
I can model it like this so that its denormalized and I get all my information in one go from
one row, sorted by time added. I can use composite columns.

Row key: User Id
Column Name: TimeUUID:item ID: Item Name: Item Description: Item Price: Item Qty
Column Value : Null

Now, how do I handle manipulations

 1.  Add new item :Easy , just a new column
 2.  Add exiting item or modify qty: I want to get to the correct column to update . Can I
search by second column in the composite column (equals condition) & update the column
name itself to reflect new TimeUUID and qty?  Or would it be better to just add it as a new
column and always use the latest column for an item in the application code and delete duplicates
in the background.
 3.  Delete item: Can I search by second column in the composite column to find the correct
column to delete?

I was trying to find hector examples where we search for second column in a composite column,
but I couldn't find any good one. Im not sure if its possible.…if you have any do have any
example please share.


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