Postgres 9.3 JSON Output multi-dimensional object - json

Question

Given this query:-
SELECT id as id,
attributes->>'name' as file_name,
status
from workflow.events
where schema='customer'
and type='FILE_UPLOAD'
id,file_name, status
1,name,status
2,name2,status2
I want to output this structure:-
{
"1" :{"id" :"1", "file_name" : "name", "status" : "status1"},
"2" :{"id" :"2", "file_name" : "name2","status" : "status2"}
}
I can do it at the moment using string functions but this seems messy and inefficient. CAn it be done using the native postgresql json functions?

Answer 1

If you want to get two records with json, use row_to_json() function:
with cte as (
select
id as id,
attributes->>'name' as file_name,
status
from workflow.events
where schema='customer' and type='FILE_UPLOAD'
)
select row_to_json(c) from cte as c
output:
{"id":1,"file_name":"name","status":"status"}
{"id":2,"file_name":"name2","status":"status2"}
If you want to get json array:
with cte as (
select
id as id,
attributes->>'name' as file_name,
status
from workflow.events
where schema='customer' and type='FILE_UPLOAD'
)
select json_agg(c) from cte as c
output:
[{"id":1,"file_name":"name","status":"status"},
{"id":2,"file_name":"name2","status":"status2"}]
But for you desired output, I can only suggest string transformation:
with cte as (
select
id::text as id,
file_name,
status
from workflow.events
where schema='customer' and type='FILE_UPLOAD'
)
select ('{' || string_agg('"' || id || '":' || row_to_json(c), ',') || '}')::json from cte as c
sql fiddle demo