[SQL]

[Dan Langille]

I'm trying to create a function which returns a result set using a dynamic
query.  The problem occurs when it compiles.  I suspect it's my quoting,
but I'm not sure of the cause.

CREATE OR REPLACE FUNCTION LoginCounts(int) RETURNS SETOF
logincounts_record AS '
DECLARE
    MaxDays ALIAS for $1;

    r   logincounts_record%rowtype;
    i   integer;

BEGIN
    FOR i IN 1..MaxDays LOOP
        EXECUTE ''
        SELECT count(*)
          INTO r
          FROM users
         WHERE lastlogin between current_date - interval \''' ||
quote_literal(i - 1) || '' days\'
                             AND current_date - interval \''' ||
quote_literal(i)     || '' days\''';

        RETURN NEXT r;
    END LOOP;
    RETURN;
END
'
LANGUAGE plpgsql;


# select * from LoginCounts(2);
WARNING:  Error occurred while executing PL/pgSQL function logincounts
WARNING:  line 9 at execute statement
ERROR:  parser: parse error at or near "days" at character 151

thnks

-- 
Dan Langille - http://www.langille.org/

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