Re: Building JSON objects

On 03/27/2015 10:40 AM, Eli Murray wrote:
> Hi All,
>
> I'm trying to create an array of JSON objects from an existing table.
> I've created a new table:
>
> "CREATE TABLE json(data json[]);"
>
> Now i need to populate it with key value pairs from another table. I'd
> like to create the objects to look like:
>
> { "code": rawdata.deptcode, "name": rawdata.deptname }
>
> But I'm having difficulty understanding the syntax to do this because I
> find the docs to be rather difficult to parse.
>
> I've tried running the query:
>
> "INSERT INTO json(data) json_build_object(SELECT DISTINCT deptcode,
> deptname AS code, name FROM rawdata);"
>
> but it returns a syntax error.

That would be?

What version of Postgres?

>
> I've also tried running:
>
> "INSERT INTO json(data) row_to_json(SELECT DISTINCT deptcode, deptname
> FROM rawdata);"
>
> but no dice.
>
> Does anyone know the proper syntax to create an array of JSON objects
> from an existing table?

json_build_array?
http://www.postgresql.org/docs/9.4/interactive/functions-json.html

>
> --
> Senior Web Developer at The Daily Illini
> ejmurra2@illinimedia.com <mailto:ejmurra2@illinimedia.com>
> (815) 985-8760


--
Adrian Klaver
adrian.klaver@aklaver.com