update table from internet site

Hi!
I'm thinking about creating a table listing my shares (say 'Shares') and
then update its price column from a .txt file (say 'Prices') downloaded
from an internet site periodically.
Recalling past readings my first idea would be to use
something like:
=> update table Shares set price = (select price from Prices)
   where
   Shares.name = Prices.name;
and, of course, table Prices would be re-construed each time as a
=> copy Prices from raw.dowld.txt
My question is:
. Is there a better way to do that?
. Is it possible to introduce any automation in the process?

Your suggestions (even to docs/how-tos) shall be appreciated.
Regards,
    Ennio.

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