paiza.ioでelixir その278

概要

paiza.ioでelixirやってみた。
mnesiaやってみた。

サンプルコード

:mnesia.start()
:mnesia.create_table(:a, [attributes: [:key, :value]])
:mnesia.transaction(fn() -> 
    :mnesia.write({:a, :a, 1}) 
end)
:mnesia.transaction(fn() -> 
    :mnesia.write({:a, :b, 2}) 
end)
:mnesia.transaction(fn() -> 
    :mnesia.write({:a, :c, 3}) 
end)
:ets.i(:a)
:mnesia.dump_to_textfile('test_data')
|>IO.inspect

:mnesia.stop

:mnesia.create_schema([node()])
:mnesia.start
:mnesia.load_textfile('test_data')
:ets.i(:a)
:mnesia.system_info

実行結果

<1   > {a,a,1}
<2   > {a,b,2}
<3   > {a,c,3}
EOT  (q)uit (p)Digits (k)ill /Regexp -->:ok

22:40:31.762 [info]  Application mnesia exited: :stopped
New table a
<1   > {a,a,1}
<2   > {a,b,2}
<3   > {a,c,3}
EOT  (q)uit (p)Digits (k)ill /Regexp -->===> System info in version "4.16.2", debug level = none <===
opt_disc. Directory "/workspace/Mnesia.nonode@nohost" is used.
use fallback at restart = false
running db nodes   = [nonode@nohost]
stopped db nodes   = [] 
master node tables = []
remote             = []
ram_copies         = [a]
disc_copies        = [schema]
disc_only_copies   = []
[{nonode@nohost,disc_copies}] = [schema]
[{nonode@nohost,ram_copies}] = [a]
4 transactions committed, 0 aborted, 0 restarted, 2 logged to disc
0 held locks, 0 in queue; 0 local transactions, 0 remote
0 transactions waits for other nodes: []

成果物

以上。