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].
Why you don't create query like
EXECUTE 'SELECT xxx FROM TAB WHERE A = $1.x AND B = $1.y' USING NEW;
I don't understand tou your case, but usually count(*) > 0 looks like antipattern - probably you want to use EXISTS(...)
Regards
Pavel
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?
