Tulassay Zsolt <zsolt@tek.bke.hu> writes:
> Hi,
>
> i have set up a table, where two fields (creation_dt and modification_dt)
> always get the actual date/time by default when doing an INSERT.
> my question is, how is it possible to let the field modification_dt
> change when doing an UPDATE?
> Is there a way to solve it in SQL?
To do this I use a trigger in plpgsql :
create function liens_maj_fun () returns opaque as '
begin new.liens_maj := ''now''; return new;
end;
' language 'plpgsql';
create trigger liens_maj_trig before update or insert on liens for each row execute procedure liens_maj_fun();
Since it uses plpgsql don't forget to add it when you create your
base:
CREATE FUNCTION plpgsql_call_handler() RETURNS opaque AS '/usr/local/pgsql/lib/plpgsql.so' LANGUAGE 'c';
CREATE TRUSTED PROCEDURAL LANGUAGE 'plpgsql' HANDLER plpgsql_call_handler LANCOMPILER 'PL/pgSQL';
--
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