Thread: how to check if a database exists programatically

am  08.12.2005, um 17:25:10 +0530 mailte surabhi.ahuja folgendes:
>  i have to write a shell script in which i have to check if the database "abc" exists or not
>
> how should i do it ? some select query
>
> select * from ??? where database_name = 'abc';

You can parse the output from 'psql -l'.


HTH, Andreas
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Hi,

On Thu, 2005-12-08 at 17:25 +0530, surabhi.ahuja wrote:
>  i have to write a shell script in which i have to check if the
> database "abc" exists or not
>
> how should i do it ? some select query
>
> select * from ??? where database_name = 'abc';

SELECT 1 from pg_database WHERE datname='abc';

Regards,
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Hi,

On Thu, 2005-12-08 at 14:20 +0200, Devrim GUNDUZ wrote:

> SELECT 1 from pg_database WHERE datname='abc';

Ah of course:

$ psql template1 -U postgres -c "SELECT 1 AS result FROM pg_database
WHERE datname='yapab'";
 result
--------
      1
(1 row)

$ psql template1 -U postgres -c "SELECT 1 AS result FROM pg_database
WHERE datname='abc'";

 result
--------
(0 rows)

and you can parse this output too.

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