On Behalf Of David Wheeler > Sent: Saturday, 5 August 2006 5:32 a.m. > > > So, my question is: Is there any way to create such a pseudocolumn > > that can > > be populated as a result of the values of the other columns? > > If you want to use a real column, you can add it to your table and > then add a trigger to the table to compute the hash. Something like > this (in PostgreSQL): > > CREATE OR REPLACE FUNCTION hash_row() RETURNS trigger AS $$ > NEW.hash = md5(NEW.foo || NEW.bar || NEW.baz); > RETURN NEW; > $$ LANGUAGE sql; > > CREATE TRIGGER hash_row BEFORE UPDATE OR INSERT ON mytable > FOR EACH ROW EXECUTE PROCEDURE hash_row(); >
Thanks, David Alas, I'm using a version of MySQL that doesn't support triggers! Dan _______________________________________________ List: http://lists.rawmode.org/cgi-bin/mailman/listinfo/dbix-class Wiki: http://dbix-class.shadowcatsystems.co.uk/ IRC: irc.perl.org#dbix-class SVN: http://dev.catalyst.perl.org/repos/bast/trunk/DBIx-Class/ Searchable Archive: http://www.mail-archive.com/[email protected]/
