Re: Problem with raw query and using in

Thanks, I tried that, it makes the query right, but when I access the
result in a for loop it gives now:

'Cursor' object has no attribute '_last_executed'

Think for now I just stay with using 2 variables, that works fine for
the moment.


Am 17.11.2013 00:38, schrieb Dennis Lee Bieber:
> On Sat, 16 Nov 2013 22:39:09 +0100, Thorsten Sanders
> <thorsten.sanders@gmx.net> declaimed the following:
>
>> I am using mysql and when I write it like (1) then I get int is not
>> iterable on the first one, but the raw works, if I do it like (1,) the
>> first one works, but the raw one gets again the comma at the end, tried
>> several ways always one of both not working, for me it looks kinda there
>> is some magic happening and with only 1 value the comma is not removed,
>> but is removed with several values.
>>
>> For now I just use 2 variables one for the raw queries and one for the
>> other, not the best solution, but works for now.
>>
>>
>> Am 16.11.2013 16:01, schrieb Javier Guerra Giraldez:
>>> On Sat, Nov 16, 2013 at 7:40 AM, Thorsten Sanders
>>> <thorsten.sanders@gmx.net> wrote:
>>>> realms=[1]
>>>> data = AuctionData.objects.filter(itemid__exact=itemid,realm__in=realms)
>>>> data2 = AuctionData.objects.raw('SELECT * FROM auctiondata_auctiondata WHERE
>>>> itemid_id=%s AND realm_id in %s ',[itemid,realms])
>>> not sure if it's related. but most SQL adaptors use a tuple for the
>>> IN(...) parameters, not a list.
>>>
>>> check http://initd.org/psycopg/docs/usage.html#tuples-adaptation
>>>
> I suspect the main problem is that you need to set up the realms
> parameter differently -- along with the query string.
>
> MySQL, and most other SQL systems, as I recall, expect to see
>
> ... needle in (first, second, ..., last)
>
> MySQLdb sanitizes parameters by converting them to a string
> representation, escaping any special characters, and wrapping it is '
> marks.
>
> In the raw query, unless Django has an SQL parser, the above is
> generating
>
> select * from auctiondata_auctiondata where itemid_id = 'something' and
> realm_id in '[1]'
>
> when what you need to generate is
>
> select * from auctiondata_auctiondata where itemid_id = 'something' and
> realm_id in ('1')
>
> (MySQLdb doesn't know what datatype to put in at each %s -- it has first
> converted all inputs into safe strings; that's why it uses %s for the
> placeholder).
>
> If using a list of values, you'll have to create an SQL format with a
> %s for EACH value, not the list
>
> SQL = " ...%%s and stuff in (%s)" % ", ".join("%s" for x in realms)
> (if realms is [1, 3, 99] this creates
> SQL ="... %s stuff in (%s, %s, %s" )
>
> You then need to flatten the parameters
>
> parms=[itemid].extend(realms)
>

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