Re: Java and Currval

On Mon, May 02, 2005 at 17:30:12 +0100, Sam Adams <samadams@myfastmail.com> wrote:
> I'm having trouble getting the currval function to work from a Java
> program (or from Postgres at all). I want to get the value of addressid
> in the table taddress. The best I seem to be able to come up with is
> 'SELECT currval(taddress.addressid)'. However this gives me the error
> 'ERROR:  relation "1" does not exist' or whatever the number should be.
> I've tried lots of variations but can't seem to work it out. What am I
> doing wrong? Thanks.

I don't know what JAVA brings to the mix, but the argument to currval
is a string. Before version 8 you would do something like:
SELECT currval('taddress_addressid_seq')
This string isn't guaranteed to work, but would normally be the correct
one. In 8.0 there is a function that will return the sequence name.
Note that you must have also done a nextval or setval call on that
sequence in the current session or the value is undefined and trying to
access it will result in an error.