Robert,

In pure logic terms, you are getting a single checkbox per row.  So you
should only be sending a single piece of information. It makes better
logical sense for the next servlet to get the other columns from the
database itself.
Sending all columns is sort of redundant, and just adds to net traffic.

Sure it makes the next servlet work harder, but it seems a purer logical
solution to me.
Ask yourself this - if the database info for that row changed before the
user hit submit, would you want the subsequent servlet to use
- what was the table you served the user 5 minutes ago
- the up to date stuff  in the database ?

The answer to this should drive whether you send the lot or just a unique
row  ID.

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