54 lines
1.4 KiB
PL/PgSQL
54 lines
1.4 KiB
PL/PgSQL
DROP TRIGGER IF EXISTS trigger_flag ON osm_poi_polygon;
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DROP TRIGGER IF EXISTS trigger_refresh ON poi.updates;
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-- etldoc: osm_poi_polygon -> osm_poi_polygon
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CREATE OR REPLACE FUNCTION convert_poi_point() RETURNS VOID AS $$
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BEGIN
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UPDATE osm_poi_polygon
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SET geometry =
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CASE WHEN ST_NPoints(ST_ConvexHull(geometry))=ST_NPoints(geometry)
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THEN ST_Centroid(geometry)
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ELSE ST_PointOnSurface(geometry)
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END
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WHERE ST_GeometryType(geometry) <> 'ST_Point';
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ANALYZE osm_poi_polygon;
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END;
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$$ LANGUAGE plpgsql;
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SELECT convert_poi_point();
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-- Handle updates
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CREATE SCHEMA IF NOT EXISTS poi;
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CREATE TABLE IF NOT EXISTS poi.updates(id serial primary key, t text, unique (t));
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CREATE OR REPLACE FUNCTION poi.flag() RETURNS trigger AS $$
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BEGIN
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INSERT INTO poi.updates(t) VALUES ('y') ON CONFLICT(t) DO NOTHING;
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RETURN null;
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END;
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$$ language plpgsql;
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CREATE OR REPLACE FUNCTION poi.refresh() RETURNS trigger AS
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$BODY$
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BEGIN
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RAISE LOG 'Refresh poi';
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PERFORM convert_poi_point();
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DELETE FROM poi.updates;
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RETURN null;
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END;
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$BODY$
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language plpgsql;
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CREATE TRIGGER trigger_flag
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AFTER INSERT OR UPDATE OR DELETE ON osm_poi_polygon
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FOR EACH STATEMENT
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EXECUTE PROCEDURE poi.flag();
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CREATE CONSTRAINT TRIGGER trigger_refresh
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AFTER INSERT ON poi.updates
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INITIALLY DEFERRED
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FOR EACH ROW
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EXECUTE PROCEDURE poi.refresh();
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