Re: replacing jsonb field value

On Sat, May 30, 2015 at 11:52 AM, john.tiger <john.tigernassau@gmail.com> wrote:
> using 9.4.2
>
> suppose we have
> create table test (id serial primary key, data jsonb);
> insert into test (data) values ({"a":1, "b":2})
>
> want to replace "b" with 3
>
> okay, we are retrieving entire record
> res = select * from test where data ->> b = 2
>
> newrec = res
> newrec["b" = 3
>
> delete from test where data ->> b= 2
> insert into test (data) values (newrec)
>
> is this the best way until upsert arrives ?

Append the new value to it the existing field, jsonb has as property
to enforce key uniqueness, and uses the last value scanned for a given
key.
--
Michael