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util.sql
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util.sql
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/* Copyright (c) 2011 Massachusetts Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
-- Safe text-to-numeric extractor; returns null if s is nonnumeric
CREATE OR REPLACE FUNCTION to_num(TEXT) RETURNS NUMERIC AS
$$
DECLARE
s ALIAS FOR $1;
BEGIN
RETURN s::NUMERIC;
EXCEPTION
WHEN DATA_EXCEPTION THEN
RETURN NULL;
END
$$ LANGUAGE plpgsql;
-- Generate a list of random source_ids
-- First arg in # sources, second it max source size (in entities)
CREATE OR REPLACE FUNCTION random_source_list (integer, integer) RETURNS SETOF INTEGER
AS '
SELECT source_id
FROM (
SELECT source_id, random() x
FROM public.doit_sources
WHERE n_values <= $2
ORDER BY x DESC
LIMIT $1
) t;
' LANGUAGE sql;
-- Aggregate function for string concatenation
CREATE OR REPLACE FUNCTION agg_concat (agg_str TEXT, new_str TEXT, delim TEXT)
RETURNS TEXT
AS $$
BEGIN
IF new_str IS NULL THEN
RETURN agg_str;
END IF;
IF agg_str = '' THEN
RETURN new_str;
ELSE
RETURN agg_str || delim || new_str;
END IF;
END
$$ LANGUAGE plpgsql;
DROP AGGREGATE IF EXISTS group_concat (TEXT, TEXT) CASCADE;
CREATE AGGREGATE group_concat (TEXT, TEXT) (
stype = text,
sfunc = agg_concat,
initcond = ''
);
-- Overload round function to handle floats
CREATE OR REPLACE FUNCTION round(float, integer) RETURNS numeric AS
$$
BEGIN
RETURN round($1::numeric, $2);
END
$$ LANGUAGE plpgsql;
-- Exists functions (NOT USED)
create or replace function table_exists (tname text, sname text default 'public')
returns boolean
as '
select exists
(select tablename from pg_tables
where tablename = $1
and schemaname = $2);
' language sql;
create or replace function schema_exists (text)
returns boolean
as '
select exists
(select nspname from pg_namespace
where nspname = $1);
' language sql;
create or replace function view_exists (vname text, sname text default 'public')
returns boolean
as '
select exists
(select viewname from pg_views
where viewname = $1
and schemaname = $2);
' language sql;
create or replace function index_exists (iname text)
returns boolean
as '
select exists
(select indexname
from pg_indexes
where indexname = $1);
' language sql;