Update certain array elements of a json array in PostgreSQL 9.4

Question

I have a table like this;

CREATE TABLE test (
  id BIGSERIAL PRIMARY KEY,
  data JSONB
);

INSERT INTO test(data) VALUES(\'[1,2,\"a\",4,\"8\",6]\'); -- id =          


        

Answer 1

You can do this from PostgreSQL 9.5 with jsonb_set:

INSERT INTO test(data) VALUES('[1,2,"a",4,"8",6]');
UPDATE test SET data = jsonb_set(data, '{2}','"b"', false) WHERE id = 1

Try it out with a simple select:

SELECT jsonb_set('[1,2,"a",4,"8",6]', '{2}','"b"', false)
-- [1, 2, "b", 4, "8", 6]

And if you want to update two fields you can do:

SELECT jsonb_set(jsonb_set('[1,2,"a",4,"8",6]', '{0}','100', false), '{2}','"b"', false)
-- [100, 2, "b", 4, "8", 6]