Created
October 31, 2014 11:05
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POI table - postgresql - postgis - index - gist - trigger
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CREATE TABLE pois ( | |
id serial primary key, | |
lon numeric(9,6), | |
lat numeric(9,6), | |
name character varying(255), | |
geom geometry(Point,3857) -- EPSG:3857 is the spherical mercator projection | |
); | |
CREATE INDEX geom_idx ON pois USING GIST (geom GIST_GEOMETRY_OPS); | |
CREATE OR REPLACE FUNCTION update_geom() RETURNS "trigger" AS | |
$BODY$ | |
BEGIN | |
IF NEW.lon IS NOT NULL AND NEW.lat IS NOT NULL THEN | |
NEW.geom:=Transform(GeomFromEWKT('SRID=4326;POINT( ' || NEW.lon || ' ' || NEW.lat || ' )'), 3857); | |
ELSE | |
NEW.geom:=null; | |
END IF; | |
RETURN NEW; | |
END; | |
$BODY$ | |
LANGUAGE plpgsql; | |
CREATE TRIGGER update_geom_poi BEFORE INSERT OR UPDATE ON pois FOR EACH ROW EXECUTE PROCEDURE update_geom(); |
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