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Casting hexadecimal to int

I was looking for a way to cast hex numbers (stored in a varchar column)
to int. I found many people asking the same thing, but no answers.

It seems that this is supported by the following syntax

select x'1f'::int;

Since this doesn't work with variable values, I wrote this following
function. Perhaps it will help anyone wanting to do the same thing.

CREATE OR REPLACE FUNCTION hex_to_int(varchar) RETURNS integer AS '
h alias for $1;
exec varchar;
curs refcursor;
res int;
exec := ''SELECT x'''''' || h || ''''''::int'';
FETCH curs INTO res;
CLOSE curs;
return res;
LANGUAGE 'plpgsql'

Richard van den Berg, CISSP

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Jul 19 '05 #1
0 5882

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