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17 lines
592 B
MySQL
17 lines
592 B
MySQL
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DROP FUNCTION IF EXISTS public.function_zoom_xy;
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CREATE OR REPLACE FUNCTION public.function_zoom_xy(zoom integer, x integer, y integer) RETURNS bytea AS $$
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DECLARE
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mvt bytea;
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BEGIN
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SELECT INTO mvt ST_AsMVT(tile, 'public.function_zoom_xy', 4096, 'geom') FROM (
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SELECT
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ST_AsMVTGeom(ST_Transform(ST_CurveToLine(geom), 3857), ST_TileEnvelope(zoom, x, y), 4096, 64, true) AS geom
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FROM public.table_source
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WHERE geom && ST_Transform(ST_TileEnvelope(zoom, x, y), 4326)
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) as tile WHERE geom IS NOT NULL;
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RETURN mvt;
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END
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$$ LANGUAGE plpgsql IMMUTABLE STRICT PARALLEL SAFE;
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