This should work:
create or replace function flow(integer) RETURNS TABLE (gid int, geom
geometry, geojson text) AS
$$
WITH RECURSIVE flow(gid, geom) AS (
SELECT e.gid, e.geom FROM electric_line e, fuses f WHERE
ST_DWithin(ST_AsText(e.geom)::geometry, ST_AsText(f.geom)::geometry,
0.01) AND f.gid=$1
UNION ALL
SELECT n.gid, n.geom
FROM electric_line n, flow f
WHERE ST_DWithin(ST_EndPoint(f.geom),ST_StartPoint(n.geom),0.01)
)
SELECT *, ST_ASGeoJSON(ST_Transform(geom,4326),6) AS geojson
FROM flow;
$$
LANGUAGE SQL;
SELECT * FROM flow(1);
On 12/09/2013 03:57 PM, Jonatan Malaver wrote:
Hello,
I'm new to postgis/postgresql. I was wondering if anyone could tell
me how to make a function out of this sql query:
WITH RECURSIVE flow(gid, geom) AS (
SELECT e.gid, e.geom FROM electric_line e, fuses f WHERE
ST_DWithin(ST_AsText(e.geom)::geometry, ST_AsText(f.geom)::geometry,
0.01) AND f.gid=' . $_GET['fuse'] . '
UNION ALL
SELECT n.gid, n.geom
FROM electric_line n, flow f
WHERE ST_DWithin(ST_EndPoint(f.geom),ST_StartPoint(n.geom),0.01)
)
SELECT *, ST_ASGeoJSON(ST_Transform(geom,4326),6) AS geojson
FROM flow;
I'd like to make a function flow(gid)
Thanks,
Jon
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