Обсуждение: Is thre a way?

Hi o/

I have a table with 2000 names and emails.. and I did UPDATE list SET email = '' without the WHERE and now all rows is null in column email..


I have a backup made with pg_dump.. is there a way to restore only the email data?


Thanks!!

On 06/05/2009 21:28, Anderson dos Santos Donda wrote:

> I have a table with 2000 names and emails.. and I did UPDATE list SET
> email = '' without the WHERE and now all rows is null in column
> email..

<pedant mode>
They're not null, they're just filled with empty strings.... :-)
</pedant mode>

> I have a backup made with pg_dump.. is there a way to restore only
> the email data?

If the backup is in PLAIN (text) format, you can copy-and-paste the
relevant bits into a new script, and run that through psql.

If it's in one of the binary formats, I think pg_restore lets you choose
which objects you want to restore.

Either way, you ought to be OK. You may find it easiest to drop the
table first, restore it from the backup, and then restore any foreign
key dependencies.

Ray.

------------------------------------------------------------------
Raymond O'Donnell, Director of Music, Galway Cathedral, Ireland
rod@iol.ie
Galway Cathedral Recitals: http://www.galwaycathedral.org/recitals
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On 2009-05-06, Anderson dos Santos Donda <andersondonda@gmail.com> wrote:
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>
> Hi o/
>
> I have a table with 2000 names and emails.. and I did UPDATE list SET email
>= '' without the WHERE and now all rows is null in column email..
>
>
> I have a backup made with pg_dump.. is there a way to restore only the email
> data?

what format of pg_dump?

If a binary dump use pg_restore to restore the table you want to a
scratch database then use dblink or copy to get that into a temp table
in the database you want.

If a text dump use sed (or an interactive editor) to extract the table
data you want, load it into a temp table

finally do an
UPDATE ... FROM ....
to fix the losses.

I had to do this a few months ago.

My backup is PLAIN(text) format... i'll try to do with sed...

Thanks for all o/