Re: URL Decode function

Hi,

You can create your own "decode" function in pg like this example using varchars as input.  Then simply create other overloaded "decode" functions for different input datatypes.
 

CREATE OR REPLACE FUNCTION decode(expr varchar, search varchar, result varchar, dflt varchar) RETURNS varchar AS
$$      
BEGIN
CASE WHEN expr = search THEN RETURN result; ELSE RETURN dflt; END CASE;
END
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION decode_url_part(p varchar) RETURNS varchar AS $$
SELECT convert_from(CAST(E'\\x' || string_agg(CASE WHEN length(r.m[1]) = 1 THEN encode(convert_to(r.m[1], 'SQL_ASCII'), 'hex') ELSE substring(r.m[1] from 2 for 2) END, '') AS bytea), 'UTF8')
FROM regexp_matches($1, '%[0-9a-f][0-9a-f]|.', 'gi') AS r(m);
$$ LANGUAGE SQL IMMUTABLE STRICT;