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CREATE OR REPLACE FUNCTION generation_table_geo() RETURNS BOOLEAN AS $$
DECLARE
mviews RECORD;
insee varchar;
BEGIN
FOR mviews IN SELECT code_insee FROM public.commune ORDER BY code_insee LOOP
insee:=mviews.code_insee;
--Création d'une table temporaire par période --
DROP TABLE IF EXISTS tb_1960 CASCADE CONSTRAINT;
CREATE TEMP TABLE tb_1960
AS
(SELECT buffer(st_union(buffer(public.tb_parcelle.the_geom,60)),-20)as the_geom
FROM public.tb_parcelle
WHERE public.tb_parcelle.id=insee AND public.tb_parcelle.annee<=1960 );
DROP TABLE IF EXISTS tb_1970 CASCADE CONSTRAINT;
CREATE TEMP TABLE tb_1970
AS
(SELECT buffer(st_union(buffer(public.tb_parcelle.the_geom,60)),-20)as the_geom
FROM public.tb_parcelle
WHERE public.tb_parcelle.id=insee AND public.tb_parcelle.annee<=1970 );
DROP TABLE IF EXISTS tb_1980 CASCADE CONSTRAINT;
CREATE TEMP TABLE tb_1980
AS
(SELECT buffer(st_union(buffer(public.tb_parcelle.the_geom,60)),-20)as the_geom
FROM public.tb_parcelle
WHERE public.tb_parcelle.id=insee AND public.tb_parcelle.annee<=1980 );
DROP TABLE IF EXISTS tb_1990 CASCADE CONSTRAINT;
CREATE TEMP TABLE tb_1990
AS
(SELECT buffer(st_union(buffer(public.tb_parcelle.the_geom,60)),-20)as the_geom
FROM public.tb_parcelle
WHERE public.tb_parcelle.id=insee AND public.tb_parcelle.annee<=1990 );
DROP TABLE IF EXISTS tb_2000 CASCADE CONSTRAINT;
CREATE TEMP TABLE tb_2000
AS
(SELECT buffer(st_union(buffer(public.tb_parcelle.the_geom,60)),-20)as the_geom
FROM public.tb_parcelle
WHERE public.tb_parcelle.id=insee AND public.tb_parcelle.annee<=2000 );
--Création des indexs--
EXECUTE 'CREATE INDEX geom60 ON tb_1960 USING gist (the_geom)';
EXECUTE 'CREATE INDEX geom70 ON tb_1970 USING gist (the_geom)';
EXECUTE 'CREATE INDEX geom80 ON tb_1980 USING gist (the_geom)';
EXECUTE 'CREATE INDEX geom90 ON tb_1990 USING gist (the_geom)';
EXECUTE 'CREATE INDEX geom00 ON tb_2000 USING gist (the_geom)';
--insertions table finale --
EXECUTE 'INSERT INTO test_tb_result (annee,the_geom) VALUES (''1960'',(SELECT the_geom FROM tb_1960))';
EXECUTE 'INSERT INTO test_tb_result (annee,the_geom) VALUES (''1970'',(SELECT st_difference(tb_1970.the_geom,tb_1960.the_geom)AS the_geom FROM tb_1970,tb_1960))';
EXECUTE 'INSERT INTO test_tb_result (annee,the_geom) VALUES (''1980'',(SELECT st_difference(tb_1980.the_geom,tb_1970.the_geom)AS the_geom FROM tb_1980,tb_1970))';
EXECUTE 'INSERT INTO test_tb_result (annee,the_geom) VALUES (''1990'',(SELECT st_difference(tb_1990.the_geom,tb_1980.the_geom)AS the_geom FROM tb_1990,tb_1980))';
EXECUTE 'INSERT INTO test_tb_result (annee,the_geom) VALUES (''2000'',(SELECT st_difference(tb_2000.the_geom,tb_1990.the_geom)AS the_geom FROM tb_2000,tb_1990))';
END LOOP;
EXECUTE 'UPDATE test_tb_result SET surface = st_area2d(the_geom)';
RETURN true;
END;
$$LANGUAGE plpgsql volatile; |
