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On Thursday 17 July 2003 03:46, Terence Kearns wrote:
> CREATE FUNCTION base.fn_fkey_check(text, text, int4) RETURNS bool AS
> 'DECLARE
> BEGIN
> RETURN (SELECT count($1) FROM $2 where $1 = $3)::bool;
> END;'
> LANGUAGE 'sql';
>
> produces this error
> ERROR: parser: parse error at or near "RETURN" at character 20
>
> I'm trying to create a function to use on a trigger to check reference
> to views since pg does not support foreign keys referencing views.
If you want to write triggers, there is great documentation on that in the
PL/pgSQL documentation.
I'll give this a shot:
CREATE FUNCTION base.fn_fkey_check(name, name, name, name) RETURNS TRIGGER AS
'
BEGIN " $1 column1 (the table that has the foreign key column) " $2 - table2 $3 - column2 (the table/column that is
theprimary key being
reference) EXECUTE ''SELECT $3 FROM $2 WHERE $3=NEW.$1''; IF FOUND THEN RETURN NEW RAISE ERROR ''Foreign key
violation.''; RETURN;
END'
LANGUAGE 'plpgsql';
- --
Jonathan Gardner <jgardner@jonathangardner.net>
(was jgardn@alumni.washington.edu)
Live Free, Use Linux!
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