From: | sundaram <sundaram(dot)bioreliance(at)gmail(dot)com> |
---|---|
To: | pgsql-admin(at)postgresql(dot)org |
Subject: | Re: psql shell return codes - checking if database exists |
Date: | 2011-06-14 19:13:56 |
Message-ID: | 1308078836071-4488964.post@n5.nabble.com |
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Thread: | |
Lists: | pgsql-admin |
Perhaps the grep solution will only provide an accurate response if the
database name is not a substring of some other database name.
In other words, if one were to attempt to confirm that database prod10
exists- they might execute (per the suggestion):
psql --list | grep prod10
But, the result could be misleading if the following databases also exist on
the same server:
prod100
prod101
prod1000
myprod10
yourprod101
etc.
I would like to suggest querying directly from the system table pg_database
like this:
psql --tuples-only --command "select * from pg_database where datname =
'prod10';"
You can pipe and process the result as appropriate for your needs.
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