Jeff Boes wrote:
I'm trying to write a general-purpose trigger that will disallow updates
on certain fields (I could probably do this in other ways, but I have a
stubborn streak ...).
Given a table, I want to define a trigger on that table that will
"write-protect" one column by name:
CREATE TRIGGER tbl_nomod_create
BEFORE INSERT OR UPDATE ON tbl
FOR EACH ROW EXECUTE PROCEDURE
no_modification_allowed('create_date');
CREATE OR REPLACE FUNCTION no_modification_allowed()
RETURNS TRIGGER
LANGUAGE 'plpgsql'
AS '
It's a lot easier if you use TCL/Perl/one of the other interpreted
languages. Bound to be an example in the mailing list archives, I might
even have posted one.
--
Richard Huxton
Archonet Ltd
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