On Tue, Sep 30, 2008 at 5:16 AM, Glenn Gillen <glenn.gillen@gmail.com> wrote:
> Hey all,
>
> I've got a table with a unique constraint across a few fields which I
> need to regularly import a batch of data into. Is there a way to do it
> with COPY without getting conflicts on the unique contraint? I have no
> was of being certain that some of the data I'm trying to load isn't in
> the table already.
>
> Ideally I'd like it to operate like MySQL's on_duplicate_key_update
> option, but for now I'll suffice with just ignoring existing rows and
> proceeding with everything else.
I ran into a similar problem. I'm using these merge_by_key functions:
http://pgfoundry.org/projects/mbk
Here's a quick example...
CREATE TEMP TABLE foo (LIKE dst INCLUDING DEFAULTS);
COPY foo (c1, c2) FROM STDIN;
(your copy data here)
\.
SELECT * FROM merge_by_key( 'public', -- table schema 'dst', -- table name 'mnew.c2 < mold.c2', --
mergecondition 'select c1,c2 FROM foo'
);
Disclaimer: The author is a friend of mine. :-)
