Re: Change in datetime type casting

On 06/28/2012 02:21 AM, Daniele Varrazzo wrote:
> On Thu, Jun 28, 2012 at 7:30 AM, Federico Di Gregorio <fog@dndg.it> wrote:
>> On 28/06/12 01:19, Adrian Klaver wrote:
>
>>> Note the addition of the casts. This is causing problems when using the
>>> hstore adapter as hstore expects a plain string. Is there a way to get
>>> around this?
>>
>> The cast were introduced because PostgreSQL 9.x is much strictier about
>> function signatures than the 8.x series. Sometimes functions taking
>> parameters were not found because of the implicit text->other type cast.
>
> Hstore is a mapping from strings to strings, not a generic dictionary
> mapping. There's never been a promise to adapt generic python
> dictionary (mapping hashable -> anything) into it. Even if you ram a
> python date into a postgres hstore, reading it back you will get a
> string.

Which begs the question why does the adapter not do str(value) when
creating the ARRAY?

>
> You can write a custom adapter to map the datetimes to strings without
> the cast and use them into hstore.

Bigger question:) Is it possible to turn adaption off for a
connection/cursor?

>
> -- Daniele
>


--
Adrian Klaver
adrian.klaver@gmail.com