Re: [HACKERS] Fwd: Weird issues when reading UDT from stored function

On Wed, Feb 16, 2011 at 7:03 AM, Oliver Jowett <oliver@opencloud.com> wrote:
> On 17/02/11 00:58, Robert Haas wrote:
>> On Wed, Feb 16, 2011 at 3:30 AM, Lukas Eder <lukas.eder@gmail.com> wrote:
>>> I'm not trying to fix the signature. I want exactly that signature. I want
>>> to return 1 UDT as an OUT parameter from a function.
>>>
>>> Somewhere between JDBC and the database, this signature is lost, and JDBC's
>>> internal code tells me that I have to bind 6 OUT parameters, instead of 1.
>>> It happens to be so, because the UDT contains 6 attributes, so somehow the
>>> JDBC/database protocol flattens the UDT, and I think that's a bug, either in
>>> JDBC or in the protocol or in the database. My findings were that I can
>>> correctly read the UDT OUT parameter using the pgAdmin III tool, so I
>>> excluded the database as a bug holder candidate.
>>
>> Oh, OK.  Sorry, I can't help you any with the JDBC side...
>
> Well, the underlying problem is that "SELECT * from
> function_with_one_out_parameter()" is returning *6* columns, not 1
> column. I don't know if that's expected or not on the plpgsql side, but
> the JDBC driver has no way of distinguishing that sort of result from a
> function that has 6 OUT parameters.

If you do SELECT function_with_one_out_parameter() rather than SELECT
* FROM function_with_one_out_parameter(), you'll get just one
argument.  Does that help at all?

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company