PostgreSQL 7.4 ...
I'm trying to find a way to drop a table via SQL if it contains 0 rows. Here
was my thought:
CREATE OR REPLACE FUNCTION dropif(text, bool) RETURNS bool AS
'DECLARE tblname ALIAS FOR $1; condition ALIAS FOR $2;
BEGIN IF (condition) THEN EXECUTE(\'DROP TABLE "\' || tblname || \'";\'); END IF; RETURN \'t\'::bool;
END;' LANGUAGE 'plpgsql' VOLATILE;
... then ...
BEGIN;
CREATE TABLE testtbl (i int4);
SELECT dropif('testtbl',(SELECT count(*)::int4 FROM testtbl) = 0);
ERROR: relation 286000108 is still open
CONTEXT: PL/pgSQL function "dropif" line 6 at execute statement
... It makes sense. The select is still open when the table is going to be
dropped. I need a different strategy.
Please advise!
CG
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