Update _1SSTREAM set DATE_TIME_DOCID=? where ID=?;
If @@ROWCOUNT =  0  
Insert into _1SSTREAM (ID, DATE_TIME_DOCID) values(?, ?)

create function UPDATE_OR_INSERT (p_query_update text,p_query_insert text) returns void as 
$$ 
declare 
begin
execute p_query_update;
if FOUND=false then 
execute(p_query_insert);
end if;
end
$$ language plpgsql;

SELECT UPDATE_OR_INSERT('UPDATE _1SSTREAM SET DATE_TIME_DOCID = '||?||' WHERE ID = '||?, 'INSERT INTO _insert__1SSTREAM (ID, DATE_TIME_DOCID) VALUES ('||?||', '||?||')'::text)