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PL/pgSQL

PL/pgSQL - Programming language

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PL/pgSQL is a programming language created in 1998 by Jan Wieck.

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PL/pgSQL (Procedural Language/PostgreSQL) is a procedural programming language supported by the PostgreSQL ORDBMS. It closely resembles Oracle's PL/SQL language. Implemented by Jan Wieck, PL/pgSQL first appeared with PostgreSQL 6.4, released on October 30, 1998. Read more on Wikipedia...


Example from Linguist:
load 'plpgsql'; load 'plpgsql_lint'; DROP FUNCTION IF EXISTS list_sites(); CREATE OR REPLACE FUNCTION list_sites() RETURNS TABLE (fc json) AS $func$ BEGIN RETURN QUERY SELECT row_to_json(feat_col) FROM ( SELECT 'FeatureCollection' AS type, array_to_json(array_agg(feat)) AS features FROM ( SELECT DISTINCT ON (new_id) 'Feature' AS type, ST_ASGeoJSON(loc.geom)::json AS geometry, row_to_json( (SELECT prop FROM (SELECT new_id) AS prop)) AS properties FROM location loc) AS feat) AS feat_col; END; $func$ LANGUAGE plpgsql; DROP FUNCTION IF EXISTS get_observations(character varying, integer); CREATE OR REPLACE FUNCTION get_observations(kind varchar, site_id integer) RETURNS TABLE (fc json) AS $func$ BEGIN IF kind = 'o2_abs' THEN RETURN QUERY SELECT array_to_json(array_agg(row_to_json(obs))) FROM ( SELECT observation_date AS date, o2_abs AS value FROM oxygen WHERE new_id = site_id) AS obs; ELSIF kind = 'o2_rel' THEN RETURN QUERY SELECT array_to_json(array_agg(row_to_json(obs))) FROM ( SELECT observation_date AS date, o2_rel AS value FROM oxygen WHERE new_id = site_id) AS obs; ELSIF kind = 'temp' THEN RETURN QUERY SELECT array_to_json(array_agg(row_to_json(obs))) FROM ( SELECT observation_date AS date, temp AS value FROM oxygen WHERE new_id = site_id) AS obs; END IF; END; $func$ LANGUAGE plpgsql;

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