我在 Mnesia 数据库中插入数据时遇到了一些问题。
这是代码：（模式已经存在）
-module(mnesia_test).
-record(messages_queue, {id, ack, order, message}).
-export([start/0, add/0]).
start() ->
mnesia:start(),
mnesia:delete_table(messages_queue),
mnesia:create_table(messages_queue, [{attributes, record_info(fields, messages_queue)}, {type, bag}, {record_name, messages_queue}]).
add() ->
M = #messages_queue{id = "11223344", ack = [0, 5, 32, 91, 23, 106], order= 0, message="Hello world !"},
mnesia:write(M).
写入被中止：
Erlang R16B (erts-5.10.1) [source] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false]
Eshell V5.10.1 (abort with ^G)
1> mnesia_test:start().
{atomic,ok}
2> mnesia_test:add().
** exception exit: {aborted,no_transaction}
in function mnesia:abort/1 (mnesia.erl, line 309)