From: Michael Beckstette <mbeckste@TechFak.Uni-Bielefeld.DE>
To: pgsql-sql@postgresql.org
Subject: dynamic table names, determined by calling parameter
Date: Tue, 28 May 2002 16:43:03 +0200
Message-ID: <1020528164303.ZM17839@sirari.TechFak.Uni-Bielefeld.DE> (raw)
Hi,
sorry, when this is a silly question, but i wonder why the following pl/pgsql
functions works:
CREATE FUNCTION test (text) RETURNS TEXT AS '
DECLARE
table_name ALIAS FOR $1;
BEGIN
-- test_table is an existing table
CREATE TEMPORARY TABLE temp1 AS SELECT * FROM test_table WHERE (hsp_rank=1 AND
hsp_evalue<=evalue_cutoff);
RETURN table_name;
END;
' LANGUAGE 'plpgsql';
and this one with the table name specified by the calling parameter not:
CREATE FUNCTION test (text) RETURNS TEXT AS '
DECLARE
table_name ALIAS FOR $1;
BEGIN
CREATE TEMPORARY TABLE temp1 AS SELECT * FROM table_name WHERE (hsp_rank=1 AND
hsp_evalue<=evalue_cutoff);
RETURN table_name;
END;
' LANGUAGE 'plpgsql';
Result:
prod2_db=#SELECT test('test_table');
ERROR: parser: parse error at or near "$1"
Any idea ?
Regards
Michael Beckstette
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To: pgsql-sql@postgresql.org
Cc: mbeckste@TechFak.Uni-Bielefeld.DE
Subject: Re: dynamic table names, determined by calling parameter
In-Reply-To: <1020528164303.ZM17839@sirari.TechFak.Uni-Bielefeld.DE>
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