Re: Unpacking a Python list in a query.

From: Israel Ben Guilherme Fonseca <israel(dot)bgf(at)gmail(dot)com>
To: Sukhbir Singh <singheinstein(at)gmail(dot)com>
Cc: David Niergarth <dn(at)hddesign(dot)com>, psycopg(at)postgresql(dot)org
Subject: Re: Unpacking a Python list in a query.
Date: 2011-06-24 19:54:25
Message-ID: BANLkTi=jbxsNanQOk_9+eL24zDm9yLRuRA@mail.gmail.com
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Hmm, I was trying to remember why lists and tuples were different and found
this in the docs:

Python lists are converted into PostgreSQL ARRAYs:

-

>>> cur.mogrify("SELECT %s;", ([10, 20, 30], ))
'SELECT ARRAY[10, 20, 30];'

Python tuples are converted in a syntax suitable for the SQL IN operator and
to represent a composite type:

>>> cur.mogrify("SELECT %s IN %s;", (10, (10, 20, 30)))
'SELECT 10 IN (10, 20, 30);'

Just remember that. :)

2011/6/24 Sukhbir Singh <singheinstein(at)gmail(dot)com>

> Hi,
>
> > Actually, a list or a tuple will work just fine.
>
> Indeed, it does work. I somehow didn't try the most obvious solution
> to this, focusing on unpacking all the time :-)
>
> Thank you.
>
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