On Wed, Mar 23, 2011 at 10:29 AM, Sven Haag <sven-haag@gmx.de> wrote:
> hello pgsql fans out there,
>
> i've already created a function that returns a list of IDs of all sub-samples based on a given sample ID. this works
fine.now i like to extend this function so that it can receive a list of sample IDs. e.g.:
>
> fn_get_subsamples(IN sample_numbers SETOF integer)
>
>
> here is the existing function:
>
> CREATE OR REPLACE FUNCTION fn_get_subsamples(IN sample_number integer)
> RETURNS SETOF integer AS
> $BODY$
> WITH RECURSIVE recursetree(sample_number) AS (
> SELECT sample_number
> FROM sample
> WHERE parent_sample = $1
>
> UNION ALL
>
> SELECT t.sample_number
> FROM sample t
> JOIN recursetree rt ON rt.sample_number = t.parent_sample
> )
>
> SELECT sample_number
> FROM recursetree;
> $BODY$
> LANGUAGE sql VOLATILE
CREATE OR REPLACE FUNCTION fn_get_subsamples(IN sample_numbers integer[])
RETURNS SETOF integer AS
$BODY$
WITH RECURSIVE recursetree(sample_number) AS (
SELECT sample_number
FROM sample
WHERE parent_sample in (select unnest($1))
UNION ALL
SELECT t.sample_number
FROM sample t
JOIN recursetree rt ON rt.sample_number = t.parent_sample
)
SELECT sample_number
FROM recursetree;
$BODY$
LANGUAGE sql VOLATILE
merlin
