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/*PGR-GNU*****************************************************************
File: pgr_parameter_check.sql
Copyright (c) 2014 Celia Virginia Vergara Castillo
Mail: vicky_vergara@hotmail.com
------
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*/
/*
-----------------------------------------------------------------------
-- Function _pgr_parameter_check
-- Check's the parameters type of the sql input
-----------------------------------------------------------------------
-- change the default to true when all the functions will use the bigint
-- put TRUE when it uses BGINT
-- Query styles:
-- dijkstra (id, source, target, cost, [reverse_cost])
-- johnson (source, target, cost, [reverse_cost])
*/
--v3.0
CREATE FUNCTION _pgr_parameter_check(fn text, sql text, big boolean default false)
RETURNS BOOLEAN AS
$BODY$
DECLARE
rec record;
rec1 record;
has_rcost boolean;
safesql text;
BEGIN
IF (big) THEN
RAISE EXCEPTION 'This function is for old style functions';
END IF;
-- checking query is executable
BEGIN
safesql = 'select * from ('||sql||' ) AS __a__ limit 1';
execute safesql into rec;
EXCEPTION
WHEN OTHERS THEN
RAISE EXCEPTION 'Could not execute query please verify syntax of: '
USING HINT = sql;
END;
-- checking the fixed columns and data types of the integers
IF fn IN ('dijkstra','astar') THEN
BEGIN
execute 'select id,source,target,cost from ('||safesql||') as __b__' into rec;
EXCEPTION
WHEN OTHERS THEN
RAISE EXCEPTION 'An expected column was not found in the query'
USING ERRCODE = 'XX000',
HINT = 'Please verify the column names: id, source, target, cost';
END;
execute 'select pg_typeof(id)::text as id_type, pg_typeof(source)::text as source_type, pg_typeof(target)::text as target_type, pg_typeof(cost)::text as cost_type'
|| ' from ('||safesql||') AS __b__ ' into rec;
-- Version 2.0.0 is more restrictive
IF NOT( (rec.id_type in ('integer'::text))
AND (rec.source_type in ('integer'::text))
AND (rec.target_type in ('integer'::text))
AND (rec.cost_type = 'double precision'::text)) THEN
RAISE EXCEPTION 'Error, columns ''source'', ''target'' must be of type int4, ''cost'' must be of type float8'
USING ERRCODE = 'XX000';
END IF;
END IF;
IF fn IN ('astar') THEN
BEGIN
execute 'select x1,y1,x2,y2 from ('||safesql||') as __b__' into rec;
EXCEPTION
WHEN OTHERS THEN
RAISE EXCEPTION 'An expected column was not found in the query'
USING ERRCODE = 'XX000',
HINT = 'Please verify the column names: x1,y1, x2,y2';
END;
execute 'select pg_typeof(x1)::text as x1_type, pg_typeof(y1)::text as y1_type, pg_typeof(x2)::text as x2_type, pg_typeof(y2)::text as y2_type'
|| ' from ('||safesql||') AS __b__ ' into rec;
-- Version 2.0.0 is more restrictive
IF NOT( (rec.x1_type = 'double precision'::text)
AND (rec.y1_type = 'double precision'::text)
AND (rec.x2_type = 'double precision'::text)
AND (rec.y2_type = 'double precision'::text)) THEN
RAISE EXCEPTION 'Columns: x1, y1, x2, y2 must be of type float8'
USING ERRCODE = 'XX000';
END IF;
END IF;
-- checking the fixed columns and data types of the integers
IF fn IN ('johnson') THEN
BEGIN
execute 'select source,target,cost from ('||safesql||') as __b__' into rec;
EXCEPTION
WHEN OTHERS THEN
RAISE EXCEPTION 'An expected column was not found in the query'
USING HINT = 'Please verify the column names: id, source, target, cost',
ERRCODE = 'XX000';
END;
execute 'select pg_typeof(source)::text as source_type, pg_typeof(target)::text as target_type, pg_typeof(cost)::text as cost_type'
|| ' from ('||safesql||') AS __b__ ' into rec;
-- Version 2.0.0 is more restrictive
IF NOT( (rec.source_type in ('integer'::text))
AND (rec.target_type in ('integer'::text))
AND (rec.cost_type = 'double precision'::text)) THEN
RAISE EXCEPTION 'Support for source,target columns only of type: integer. Support for Cost: double precision'
USING ERRCODE = 'XX000';
END IF;
END IF;
-- Checking the data types of the optional reverse_cost";
has_rcost := false;
IF fn IN ('johnson','dijkstra','astar') THEN
BEGIN
execute 'select reverse_cost, pg_typeof(reverse_cost)::text as rev_type from ('||safesql||' ) AS __b__ limit 1 ' into rec1;
has_rcost := true;
EXCEPTION
WHEN OTHERS THEN
has_rcost = false;
return has_rcost;
END;
if (has_rcost) then
IF (big) then
IF not (rec1.rev_type in ('bigint'::text, 'integer'::text, 'smallint'::text, 'double precision'::text, 'real'::text)) then
RAISE EXCEPTION 'Illegar type in optional parameter reverse_cost.'
USING ERRCODE = 'XX000';
END IF;
ELSE -- Version 2.0.0 is more restrictive
IF (rec1.rev_type != 'double precision') then
RAISE EXCEPTION 'Illegal type in optional parameter reverse_cost, must be of type float8'
USING ERRCODE = 'XX000';
END IF;
END IF;
end if;
return true;
END IF;
-- just for keeps
return true;
END
$BODY$
LANGUAGE plpgsql VOLATILE
COST 1;
COMMENT ON FUNCTION _pgr_parameter_check(TEXT, TEXT, BOOLEAN)
IS 'pgRouting internal function';
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