troubleshooting Question

Postgresql function syntax help

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casitFlag for United States of America asked on
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I have the following function.  I want to call it with a username and then it return a user_id for that user.
CREATE OR REPLACE FUNCTION public.get_user_id (username char) RETURNS int4 AS
$$ SELECT user_id from users where username = '$1' $$

That doesn't work.  when I execute the function.
select public.get_user_id('cmuench') as user_id   I get NULL back.  However when I just do a straight select with the username in the where clause it reuturns a 1 like its supposed to.
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