oracle combine constants unparalleled table

in oracle, given rudimentary information table:

create list information (
    id       varchar2(255),
    pivotal      varchar2(255),
    value    varchar2(511));

suppose i wish "insert update" value. i have something like:

merge information controlling twin 
    (id='someid' key='testkey')
when matched following 
    transform set value = 'somevalue' 
when matched following 
    insert (id, key, value) values ('someid', 'testkey', 'somevalue');

is there improved proceed this? management seems have following drawbacks:

• every verbatim needs typed twice (or total twice around parameter setting)


• the "using dual" syntax seems hacky

if best way, there any proceed around carrying set any parameter twice jdbc?