mnesia:transaction aborting

[Peter J Etheridge]

Dear Fellow Erlangers,
I run;
mnesia:transaction(fun() ->
        case mnesia:wread({pw_usr_record, pw_un}) of
            [Usr] ->
                Usr = #pw_usr_record{pw_un = Username,
pw_pas = Password},
                mnesia:write(pw_usr_record, Usr,
write),
            catch mnesia:abort("aborted")
        end
    end),
result;
mnesia:info(). 
---> Processes holding locks  Processes waiting for locks  Participant
transactions  Coordinator transactions  Uncertain transactions  Active
tables  System info in version "4.17", debug level = verbose
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