79 lines
1.9 KiB
PL/PgSQL
79 lines
1.9 KiB
PL/PgSQL
DROP TRIGGER IF EXISTS trigger_flag ON osm_lm_polygon;
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DROP TRIGGER IF EXISTS trigger_refresh ON lm_polygon.updates;
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-- etldoc: osm_lm_polygon -> osm_lm_polygon
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CREATE OR REPLACE FUNCTION update_lm_polygon() RETURNS void AS
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$$
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BEGIN
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UPDATE osm_lm_polygon
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SET geometry =
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CASE
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WHEN ST_NPoints(ST_ConvexHull(geometry)) = ST_NPoints(geometry)
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THEN ST_Centroid(geometry)
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ELSE ST_PointOnSurface(geometry)
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END
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WHERE ST_GeometryType(geometry) <> 'ST_Point';
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UPDATE osm_lm_polygon
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SET subclass = 'subway'
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WHERE station = 'subway'
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AND subclass = 'station';
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UPDATE osm_lm_polygon
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SET subclass = 'halt'
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WHERE funicular = 'yes'
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AND subclass = 'station';
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UPDATE osm_lm_polygon
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SET tags = update_tags(tags, geometry)
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WHERE COALESCE(tags->'name:latin', tags->'name:nonlatin', tags->'name_int') IS NULL;
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ANALYZE osm_lm_polygon;
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END;
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$$ LANGUAGE plpgsql;
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SELECT update_lm_polygon();
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-- Handle updates
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CREATE SCHEMA IF NOT EXISTS lm_polygon;
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CREATE TABLE IF NOT EXISTS lm_polygon.updates
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(
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id serial PRIMARY KEY,
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t text,
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UNIQUE (t)
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);
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CREATE OR REPLACE FUNCTION lm_polygon.flag() RETURNS trigger AS
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$$
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BEGIN
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INSERT INTO lm_polygon.updates(t) VALUES ('y') ON CONFLICT(t) DO NOTHING;
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RETURN NULL;
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END;
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$$ LANGUAGE plpgsql;
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CREATE OR REPLACE FUNCTION lm_polygon.refresh() RETURNS trigger AS
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$$
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BEGIN
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RAISE LOG 'Refresh lm_polygon';
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PERFORM update_lm_polygon();
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-- noinspection SqlWithoutWhere
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DELETE FROM lm_polygon.updates;
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RETURN NULL;
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END;
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$$ LANGUAGE plpgsql;
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CREATE TRIGGER trigger_flag
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AFTER INSERT OR UPDATE OR DELETE
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ON osm_lm_polygon
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FOR EACH STATEMENT
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EXECUTE PROCEDURE lm_polygon.flag();
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CREATE CONSTRAINT TRIGGER trigger_refresh
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AFTER INSERT
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ON lm_polygon.updates
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INITIALLY DEFERRED
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FOR EACH ROW
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EXECUTE PROCEDURE lm_polygon.refresh();
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