Re: WIP: transformation hook modules and JSON support

2009/4/1 Alvaro Herrera <alvherre@commandprompt.com>:
> Pavel Stehule escribió:
>> Hello
>>
>> I am sending samples of transformation hook modules. One module is
>> JSON support:.
>>
>> From these modules only JSON support has general usage - so only JSON
>> should be integrated to core.
>
> I'm only seeing trivial examples below, where you form the JSON objects
> by plastering literals together.  Does this work on a scenario where the
> values come from a table?

what do you thing?

My implementation works similar like SQL/XML functions - so of course,
you can read data from tables. But actually, these functions are not
100% optimised.

>
> The question is not at all theoretical -- right now our
> archives.postgresql.org site uses a JSON file that's just a dump of a
> table in a database.  This file contains a list of lists, and a number
> of properties for each (name, group it belongs to, description).
> Obviously each one needs its label too.

nested JSON structures are possible.

Pavel Stehule

>
> Right now we generate this with a JSON Perl module.
>
> --
> Alvaro Herrera                                http://www.CommandPrompt.com/
> The PostgreSQL Company - Command Prompt, Inc.
>