Re: JSON for PG 9.2

On 01/12/2012 11:21 AM, Merlin Moncure wrote:
> On Thu, Jan 12, 2012 at 9:51 AM, Andrew Dunstan<andrew(at)dunslane(dot)net> wrote:
>> On 01/12/2012 10:44 AM, Pavel Stehule wrote:
>>> this should be little bit more enhanced to support a row arrays - it
>>> can be merged with some routines from pst tool
>>> http://okbob.blogspot.com/2010/11/new-version-of-pst-collection-is.html
>> I will be covering composites.
> curious, will your function work on unregistered composites? What
> would this do?
>
> select array_to_json(array[row('a', 1), row('b', 2)]);
>

Expected behaviour is something like this:

andrew=# select q2json('
select $$a$$ || x as b,
y as c,
array[row(x.*,array[1,2,3]),
row(y.*,array[4,5,6])] as z
from generate_series(1,2) x,
generate_series(4,5) y');

[{"b":"a1","c":4,"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]},
{"b":"a1","c":5,"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]},
{"b":"a2","c":4,"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]},
{"b":"a2","c":5,"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}]

cheers

andrew