CREATE FUNCTION limit_user() RETURNS trigger
    LANGUAGE plpgsql
    AS $$

begin                                                  
NEW.ac_user := substring(NEW.ac_user from 1 for 80);   
return NEW;                                            
end; $$;
CREATE FUNCTION upgrade_repo(p_version integer) RETURNS void
    LANGUAGE plpgsql
    AS $$
declare 
        is_mono integer;
begin
        select count (*) into is_mono from information_schema.tables where table_name='repo_version';
        if is_mono = 1 then
                update repo_version set val=p_version;
        else
                update version set val=p_version;
        end if;
end;
$$;