52 lines
1.6 KiB
PL/PgSQL
52 lines
1.6 KiB
PL/PgSQL
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-- etldoc: osm_water_polygon -> osm_water_point
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-- etldoc: lake_centerline -> osm_water_point
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DROP MATERIALIZED VIEW IF EXISTS osm_water_point CASCADE;
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CREATE MATERIALIZED VIEW osm_water_point AS (
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SELECT
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wp.osm_id, topoint(wp.geometry) AS geometry,
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wp.name, wp.name_en, ST_Area(wp.geometry) AS area
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FROM osm_water_polygon AS wp
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LEFT JOIN lake_centerline ll ON wp.osm_id = ll.osm_id
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WHERE ll.osm_id IS NULL AND wp.name <> ''
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) WITH NO DATA;
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CREATE INDEX IF NOT EXISTS osm_water_point_geometry_idx ON osm_water_point USING gist (geometry);
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-- Handle updates
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CREATE SCHEMA IF NOT EXISTS water_name;
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CREATE TABLE IF NOT EXISTS water_name.updates(id serial primary key, t text, unique (t));
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CREATE OR REPLACE FUNCTION water_name.flag() RETURNS trigger AS $$
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BEGIN
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INSERT INTO water_name.updates(t) VALUES ('y') ON CONFLICT(t) DO NOTHING;
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RETURN null;
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END;
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$$ language plpgsql;
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CREATE OR REPLACE FUNCTION water_name.refresh() RETURNS trigger AS
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$BODY$
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BEGIN
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RAISE LOG 'Refresh water_name';
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REFRESH MATERIALIZED VIEW osm_water_point;
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DELETE FROM water_name.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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DROP TRIGGER IF EXISTS trigger_flag ON osm_water_polygon;
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DROP TRIGGER IF EXISTS trigger_refresh ON water_name.updates;
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CREATE TRIGGER trigger_flag
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AFTER INSERT OR UPDATE OR DELETE ON osm_water_polygon
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FOR EACH STATEMENT
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EXECUTE PROCEDURE water_name.flag();
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CREATE CONSTRAINT TRIGGER trigger_refresh
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AFTER INSERT ON water_name.updates
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INITIALLY DEFERRED
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FOR EACH ROW
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EXECUTE PROCEDURE water_name.refresh();
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