Обсуждение: Dump and Query

Is there any way to make a dump from a query?

For example if my query is:

select field1,field2 from table

Does it exist a shell command like pg_dump --QUERY myquery -f myfile?

Have a nice day
Enrico

--
If Bill Gates had a penny for everytime Windows crashed,he'd be a multi-billionaire by now .......oh look, he already
is!!!! 
scotty@linuxtime.it - Skype:sscotty71
http://www.linuxtime.it/enricopirozzi

Hi Enrico,

The following command will get you a text file of your result-set:

# echo "SELECT customer_id, first_name, sur_name FROM
users;"|/usr/local/pgsql/bin/psql -U [username] -d [database] > myfile.txt
# cat myfile.txt

 customer_id | first_name | sur_name
-------------+------------+----------
 CUS0000002  | Andy       | Shellam


Or you can dump a specific table:

# /usr/local/pgsql/bin/pg_dump --table=[tablename] [database]

Regards,

Andy.

Enrico wrote:
> Is there any way to make a dump from a query?
>
> For example if my query is:
>
> select field1,field2 from table
>
> Does it exist a shell command like pg_dump --QUERY myquery -f myfile?
>
> Have a nice day
> Enrico
>
>


--
Andy Shellam
NetServe Support Team

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p: +44 (0) 121 288 0832/0839
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You can use the COPY (http://www.postgresql.org/docs/current/static/sql-copy.html) command for doing so....

An example will be -->

COPY (SELECT * FROM country WHERE country_name LIKE 'A%') TO '/usr1/proj/bray/sql/a_list_countries.copy';

---------------------
Shoaib Mir
EnterpriseDB (www.enterprisedb.com )

Andy Shellam (Mailing Lists) wrote:
> Hi Enrico,
>
> The following command will get you a text file of your result-set:
>
> # echo "SELECT customer_id, first_name, sur_name FROM
> users;"|/usr/local/pgsql/bin/psql -U [username] -d [database] > myfile.txt
> # cat myfile.txt

Alternative version:

psql -d <your dbname> -c "SELECT customer_id, first_name, sur_name FROM
users" -o myfile.txt

On Wed, Dec 27, 2006 at 14:05:30 +0100,
  Enrico <scotty@linuxtime.it> wrote:
> Is there any way to make a dump from a query?
>
> For example if my query is:
>
> select field1,field2 from table
>
> Does it exist a shell command like pg_dump --QUERY myquery -f myfile?

In 8.2 you can use a query with the COPY command. Depending on what
you are really doing, that might be a solution for you.