Hi Hemalatha, indeed this should be doable just by calling the same service which you are using to show data in the grid; looping the result set (will basically involve lopping over the Infotable) and then calling the insert into table statement for your external Database.
You can put above logic in a single service or may be create a JS service which wraps a SQL service and then have this invoked on button click event.
Hope this helps.
