Created
September 17, 2010 14:51
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-module(mnesia_index_as_ets). | |
-export([main/0]). | |
-include_lib("eunit/include/eunit.hrl"). | |
-record(kv, {key, value}). | |
main() -> | |
mnesia:start(), | |
mnesia:create_table(kv, [{attributes, record_info(fields, kv)}, | |
{index, [#kv.value]}]), | |
IndexEts = mnesia_lib:val({kv, {index, #kv.value}}), | |
?debugFmt("Index table of ets: ~p", [IndexEts]), | |
?debugFmt("Contents: ~p", [ets:tab2list(IndexEts)]), | |
mnesia:activity(transaction, fun mnesia:write/1, [#kv{key=1, value="one"}]), | |
mnesia:activity(transaction, fun mnesia:write/1, [#kv{key=2, value="two"}]), | |
?debugFmt("Contents: ~p", [ets:tab2list(IndexEts)]), | |
mnesia:activity(transaction, fun mnesia:write/1, [#kv{key=3, value="three"}]), | |
mnesia:activity(transaction, fun mnesia:write/1, [#kv{key=two, value="two"}]), | |
?debugFmt("Contents: ~p", [ets:tab2list(IndexEts)]), | |
?debugFmt("Table info: ~p", [ets:info(IndexEts)]), | |
mnesia:stop(), | |
ok. |
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Result of execution
19> mnesia_index_as_ets:main().
/mnesia/mnesia_index_as_ets.erl:14: Index table of ets: 200722
/mnesia/mnesia_index_as_ets.erl:15: Contents: []
/mnesia/mnesia_index_as_ets.erl:19: Contents: [{"one",1},{"two",2}]
/mnesia/mnesia_index_as_ets.erl:23: Contents: [{"one",1},{"three",3},{"two",2},{"two",two}]
/mnesia/mnesia_index_as_ets.erl:25: Table info: [{memory,390},
ok
20>