On 5/8/2012 10:26 AM, Gold, Jack L (US SSA) wrote:
I’m not even sure how to express this properly, but I’ll try. I’m trying
to build a query which will select positions within a specified polygon.
I have the query:
SELECT * FROM positions WHERE ST_Within(geometry(positions.location),
ST_GeomFromText(‘POLYGON((l b, r b, r t, l t, l b))’::text, 4326));
I want to be able to replace l, b, r, and t with variable values in a
plpgsql function like so:
$BODY$
DECLARE
l integer;
r integer;
b integer;
t integer;
BEGIN
SELECT pli_config.filter_left_longitude INTO l FROM pli_config;
SELECT pli_config.filter_right_longitude INTO r FROM pli_config;
SELECT pli_config.filter_bottom_latitude INTO b FROM pli_config;
SELECT pli_config.filter_top_latitude INTO t FROM pli_config;
SELECT * FROM positions
WHERE st_within(geometry(positions.location),
st_geomfromtext('POLYGON((l b,r b,r t,l t,l b))'::text, 4326));
'POLYGON(('||l||' '||b||','||r||' '||b||','....
END;
$BODY$
The problem I have is I don’t know the proper syntax to replace the
variables in the single-quoted statement or even if it is possible. Any
ideas?
--Jack Gold
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