The link you gave is to all of Winston's blog entries, so I can't tell which one you are talking about. At the bottom of each blog entry is the text of the full link to that specific blog entry. You need to show us what that is.
I think what you are saying is that Winston shows how to get the rowkey of the selected row and you want to get the value of a field in the selected database row.
You do it like this:
myDataProvider.getValue( "NAME", rowkey)
See:
http://blogs.sun.com/divas/entry/using_checkboxes_in_a_table
http://blogs.sun.com/divas/entry/radio_buttons_in_tables
http://blogs.sun.com/divas/entry/links_in_tables