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/*PGR-GNU*****************************************************************
File: _checkquery.sql
Copyright (c) 2022 ~ Celia Virginia Vergara Castillo
mail: vicky@georepublic.de
------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
********************************************************************PGR-GNU*/
--v3.4
CREATE FUNCTION _pgr_checkquery(
TEXT -- SQL
)
RETURNS TEXT AS
$BODY$
DECLARE
main_sql TEXT;
BEGIN
IF $1 !~ '[[:space:]]' THEN
-- prepared statements no arguments
EXECUTE format($$
SELECT regexp_replace(regexp_replace(statement, %1$L,'','i'),';$','')
FROM pg_prepared_statements WHERE name = %2$L$$,
'.*' || $1 || '\s*as', $1)
INTO main_sql;
IF main_sql IS NULL THEN
RAISE EXCEPTION 'prepared statement "%" does not exist', $1;
END IF;
ELSE
-- normal query
main_sql := $1;
END IF;
BEGIN
EXECUTE format('SELECT * FROM ( %1$s ) AS __a__ limit 1', main_sql);
EXCEPTION WHEN OTHERS THEN
RAISE EXCEPTION '%', SQLERRM USING HINT = $1, ERRCODE = SQLSTATE;
END;
RETURN main_sql;
END;
$BODY$
LANGUAGE plpgsql VOLATILE STRICT;
COMMENT ON FUNCTION _pgr_checkquery(TEXT)
IS 'pgrouting internal function';
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