Check if key exists in a JSON with PL/pgSQL?

Question

I\'m trying to check if a key exists in a JSON sent as parameter in a PL/pgSQL function.

Here is the function.

CREATE FUNCTION sp_update_user(user_in         


        

Answer 1

The "json_object_keys" function can be a solution.

You can select the result of a query that uses this function into a declared variable and then check if your variable is null. Here is an example:

DECLARE
test character varying;
BEGIN
    SELECT a INTO test FROM json_object_keys(user_info) a WHERE a = 'lastname';
    IF (test IS NOT NULL) THEN
        --SUCESSS
    ELSE
        --FAIL
    END IF;
END;