将我的函数简化为 postgresql 查询

Question

我可以让这个函数变得简单，只在 Postgres 中使用 sql 吗？ （不删除，算了） 我只需要选择和插入查询。

我尝试过使用“递归”没有成功。

CREATE OR REPLACE FUNCTION mt_CriarRotaExecutada(id_rota integer)
  RETURNS void AS
$$
DECLARE
    searchsql text := '';
    searchsqlId text := '';
    var_match RECORD;
BEGIN
    EXECUTE('delete from rota_executada where id_rota = ' || CAST( id_rota As text));
    searchsql := 'select (ST_DumpPoints(the_geom)).geom as the_geom,
                         id_destino 
                  from (select id, the_geom, id_destino 
                        from rota_data 
                        where num =' || CAST( id_rota As text) || 
                        ' order by id) a';

    FOR var_match IN EXECUTE(searchsql) 
    LOOP

        EXECUTE 'insert into rota_executada(id_rota, id_rua, id_destino, the_geom, visitado) 
                 select $1, id, $3, $2,  $4 
                 from ruas r 
                 ORDER BY r.the_geom <#> $2 
                 LIMIT 1' 
        USING id_rota, var_match.the_geom, var_match.id_destino, 'N';
    END LOOP;
END;
$$
LANGUAGE 'plpgsql';

谢谢。

Answer 1

你不需要EXECUTE只需做sql语句

DELETE from rota_executada where id_rota = id_rota::text;

与

INSERT INTO rota_executada(id_rota, id_rua, id_destino, the_geom, visitado) 
   SELECT id_rota, id, var_match.id_destino, var_match.the_geom,  'N'
   FROM ruas r 
   ORDER BY r.the_geom <#> var_match.the_geom
   LIMIT 1