Re: Recursive function that receives a list of IDs and returns all child IDs

Sven Haag <sven-haag@xxxxxx> · Thu, 24 Mar 2011 22:49:22 +0100

 thanks a lot!
that function does it exactly as wished ;)!

Am 23.03.2011 22:46, schrieb Merlin Moncure:
On Wed, Mar 23, 2011 at 10:29 AM, Sven Haag<sven-haag@xxxxxx>  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

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