How do I modify fields inside the new PostgreSQL JSON datatype?

Question

With postgresql 9.3 I can SELECT specific fields of a JSON data type, but how do you modify them using UPDATE? I can\'t find any examples of this in the postgresql documenta

Answer 1

You can try updating as below:

Syntax: UPDATE table_name SET column_name = column_name::jsonb || '{"key":new_value}' WHERE column_name condition;

For your example:

UPDATE test SET data = data::jsonb || '{"a":new_value}' WHERE data->>'b' = '2';