Krishnan Trikkadeeri wrote:
> Hi,
>
> The JDBC API at the Sun website describes a two-parameter version of the method 'prepareStatement' in the interface
'Connection' with capability to retrieve auto-generated keys. One of the samples in the Sun JDBC Tutorial site also use
thismethod.
>
> Is this method available in the postgresql jdbc driver? I have not been able to locate it so far.
> If it is not implemented as yet, is there any plan to implement this method any time soon?
A few seconds on Google turns up:
http://archives.postgresql.org/pgsql-jdbc/2004-09/msg00191.php
http://groups.google.com/group/comp.databases.postgresql.interfaces.jdbc/browse_frm/thread/eae4d9b44d566bcf?hl=en&lr&ie=UTF-8&c2coff=1&safe=off&rnum=3&prev=%2Fgroups%3Fq%3Dgenerated%2Bkeys%26hl%3Den%26lr%3D%26ie%3DUTF-8%26group%3Dcomp.databases.postgresql.interfaces.jdbc%26c2coff%3D1%26safe%3Doff%26selm%3DPine.LNX.4.33.0312301523060.5331-100000%2540leary.csoft.net%26rnum%3D3
They're pretty ancient, but has a good discussion of the issues.
You should be able to use INSERT ... RETURNING to achieve the effect
you're going for without the issues involved in using the two-argument
prepareStatement interface.
I haven't looked into the current status of the interface. It's broken
by design and should really be deprecated in the JDBC spec, so it's not
all that interesting.
INSERT statements for which the two-argument prepareStatement's return
value makes no sense include:
-- INSERT using query value-source
INSERT INTO sometable SELECT something FROM othertable;
-- Multi-valued INSERT
INSERT INTO sometable (x, y, z) VALUES
(1,2,3),
(1,4,6),
(1,9,2),
(4,2,1),
(9,1,4);
INSERT ... RETURNING can provide sane results for these cases.
See, for example:
http://archives.postgresql.org/pgsql-jdbc/2007-03/msg00090.php
--
Craig Ringer
