On 15.08.2011 08:54, Craig Miles wrote:
I am experiencing unexpected behaviour on Postgres 9.0.4 using pl/pgsql
relating to selecting from a function that returns a ROWTYPE into a ROWTYPE
variable from within another function.
In the example below I :
1) Create a table, TESTTABLE and insert a row.
2) Create a function FN_TEST_GET_ROW that returns a row of ROWTYPE TESTTABLE
based on selection of a single row from TESTTABLE
3) Create a test harness in the form of a function TESTX that calls
FN_TEST_GET_ROW with ID=1
4) Call the test harness
The error shown below is returned unexpectedly
ERROR: invalid input syntax for integer: "(1,Fred)"
I would just expect the values (1, Fred) to be returned which is what
happens if I execute
SELECT fn_test_get_row(1);
directly.
You need to define testx as:
CREATE OR REPLACE FUNCTION testx() RETURNS testtable AS $$
DECLARE
i_row testtable;
BEGIN
-- Note the "* FROM "
SELECT * FROM fn_test_get_row(1) INTO i_row;
-- Success
RETURN i_row;
END;
$$ LANGUAGE plpgsql;
It's surprising at first, but makes sense when you compare the SELECTs
in testx and fn_test_get_row. In fn_test_get_row:
SELECT * INTO i_row FROM testtable WHERE id = a;
The SELECT returns two columns of types integer and varchar, and assigns
them to the two fields in i_row. In testx you have:
SELECT fn_test_get_row(1) INTO i_row;
That SELECT returns only one column, of type testtable. It can't be
assigned into i_row, which expects an integer and a varchar.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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