Re: patch: option --if-exists for pg_dump

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
Cc: Jeevan Chalke <jeevan(dot)chalke(at)enterprisedb(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Josh Kupershmidt <schmiddy(at)gmail(dot)com>, Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>
Subject: Re: patch: option --if-exists for pg_dump
Date: 2014-02-28 22:13:40
Message-ID: CAFj8pRA5x+pT44+R-Pv4=4dPfiUTTBXOkgbe5H8FyeBotKjNLA@mail.gmail.com
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Hi

> However, I don't think this is behaving sanely in pg_dumpall. AFAICT,
> pg_dumpall does not pass --clean to pg_dump (in other words it only
> emits DROP for the global objects, not the objects contained inside
> databases), so passing --if-exists results in failures. Therefore I
> think the solution is to not pass --if-exists to pg_dump at all, i.e.
> keep it internal to pg_dumpall. But maybe I'm missing something.
>

I am looking to pg_dumpall code, and I am inclined to don't pass
--if-exists to pg_dump too.

-c, --clean for pg_dumpall means "drop databases"

<<<<<
Usage:
pg_dumpall [OPTION]...

General options:
-f, --file=FILENAME output file name
-V, --version output version information, then exit
--lock-wait-timeout=TIMEOUT fail after waiting TIMEOUT for a table lock
-?, --help show this help, then exit

Options controlling the output content:
-a, --data-only dump only the data, not the schema
-c, --clean clean (drop) databases before recreating
>>>>>

so --if-exists should to mean

DROP DATABASE IF EXISTS dbname

do you agree?

Pavel

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