RE: Dynamic PL/pgSQL select query: value association propblem

Hi all

I would like to have a generic trigger function that compares on insert if there is already a record in the table with the very same values. Using PL/pgSQL ( I am not bound to that) I know the insert record structure from the new record and I can build a select query dynamically from the catalogue, but I do not know to associate the new record values to the corresponding columns. An example Table T has columns Q and L, in that order. If I create an insert trigger function I have the new values in new.L and new.Q. From the catalogue I can create a the select query S_QUERY:
select count(*) > 0 from T where A = $1 and B = $2. But when I want to EXECUTE S_QUERY USING it fails because I cannot use something like NEW[1].

Is there a way to convert the record type into an array type? Or is there even a way to do it more directly like WHERE T.RECORD = NEW?

Kind regards Thiemo

--
Öffentlicher PGP-Schlüssel:
http://pgp.mit.edu/pks/lookup?op=get&search=0x8F70EFD2D972CBEF

----------------------------------------------------------------

Why not let the database do this job for you?
Just create a proper UNIQUE constraint on the columns you are interested in, and catch a "duplicate key" exception in your app.

Regards,
Igor Neyman