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Re: How to drop a temporary view?

From: Vincenzo Romano <vincenzo(dot)romano(at)notorand(dot)it>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Merlin Moncure <mmoncure(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: How to drop a temporary view?
Date: 2012-04-20 16:38:45
Message-ID: CAHjZ2x43HEopPD4RojxOBW7UGETjYpvdUx4p5vF8HqgizKESAA@mail.gmail.com (view raw or flat)
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Lists: pgsql-general
2012/4/20 Vincenzo Romano <vincenzo(dot)romano(at)notorand(dot)it>:
> 2012/4/20 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
>> Merlin Moncure <mmoncure(at)gmail(dot)com> writes:
>>> On Fri, Apr 20, 2012 at 10:51 AM, Vincenzo Romano
>>> <vincenzo(dot)romano(at)notorand(dot)it> wrote:
>>>> Ok. That works. How can I know if there's a temporary view with the
>>>> same name in my session?
>>
>>> well, arguably you should already know somehow.  but if you don't,
>>> query information_schema.views for a table_name with a table_schema
>>> LIKE 'pg_temp%'.
>>
>> Not sure that is safe --- won't the info schema also show temp views
>> of other sessions?
>>
>> You might be able to use "DROP VIEW pg_temp.foo", which will either
>> drop a temp view of your own session or throw an error if there is none.
>>
>>                        regards, tom lane
>
> Cool! It works, despite my temporary schema should be now pg_temp_29!
> It's at chapter 18.11.1 (my fault for not searching enough).
>
> Thanks a lot Tom.

It works only if you have created at least one temporary object.
Until that the pg_temp "meta schema" doesn't resolve to a real schema
and the exception is thrown!
It's a cool thing anyway!

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