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続!ElixirでMongoDBに接続するだけの簡単なお仕事です!!

Last updated at Posted at 2015-06-04

#タイトル: 続!ElixirでMongoDBに接続するだけの簡単なお仕事です!!

##目的: ElixirからMongoDBのドライバを使ってCRUD操作する。

##目次:

1.概要
2.ElixirからCRUD操作を行う

##実行環境:
OS: Windows8.1
Erlang: Eshell V6.4
Elixir: v1.0.4
elixir-mongo: v0.5.1
MongoDB:v3.0.3

###1. 概要
タイトルと目的の通り。
ElixirからMongoDBのドライバを利用しCRUD操作を行います。

sapporo.beamに参加させて頂きました。
niku様に教えて頂いた参考リンクのお陰様でCRUD操作ができました。
http://sapporo-beam.github.io/

実行のための準備等は以前の記事を参考にして下さい。
ElixirでMongoDBに接続するだけの簡単なお仕事です!!

###2. ElixirからCRUD操作を行う

mongo_test.ex
mongo = Mongo.connect!
db = mongo |> Mongo.db("phoenix_bbs")
collection = db |> Mongo.Db.collection("comments")

# init data
Mongo.Collection.drop collection
[
  %{name: "hoge", title: "hoge", comment: "hogehoge"},
  %{name: "huge", title: "huge", comment: "hugehuge"},
  %{name: "darui", title: "blogger", comment: "darui"}
] |> Mongo.Collection.insert(collection)

IO.puts "insert result"
%{name: "foo", title: "bar", comment: "foobar"} |> Mongo.Collection.insert_one!(collection)

# find
docs = collection |> Mongo.Collection.find |> Enum.to_list
IO.inspect docs

IO.puts "update result"
collection |> Mongo.Collection.update(%{name: "foo"}, %{name: "fizz", title: "bazz", comment: "fizzbazz"})

# find
docs = collection |> Mongo.Collection.find |> Enum.to_list
IO.inspect docs

IO.puts "delete result"
collection |> Mongo.Collection.delete(%{name: "fizz"})

# find
docs = collection |> Mongo.Collection.find |> Enum.to_list
IO.inspect docs

Mongo.Server.close(mongo)

実行結果

insert result
[%{_id: ObjectId(55703854f328cfab505c6d99), comment: "hogehoge", name: "hoge",
   title: "hoge"},
 %{_id: ObjectId(55703854f328cfab505c6d9a), comment: "hugehuge", name: "huge",
   title: "huge"},
 %{_id: ObjectId(55703854f328cfab505c6d9b), comment: "darui", name: "darui",
   title: "blogger"},
 %{_id: ObjectId(55703854f328cfab505c6d9c), comment: "foobar", name: "foo",
   title: "bar"}]

update result
[%{_id: ObjectId(55703854f328cfab505c6d99), comment: "hogehoge", name: "hoge",
   title: "hoge"},
 %{_id: ObjectId(55703854f328cfab505c6d9a), comment: "hugehuge", name: "huge",
   title: "huge"},
 %{_id: ObjectId(55703854f328cfab505c6d9b), comment: "darui", name: "darui",
   title: "blogger"},
 %{_id: ObjectId(55703854f328cfab505c6d9c), comment: "fizzbazz", name: "fizz",
   title: "bazz"}]

delete result
[%{_id: ObjectId(55703854f328cfab505c6d99), comment: "hogehoge", name: "hoge",
   title: "hoge"},
 %{_id: ObjectId(55703854f328cfab505c6d9a), comment: "hugehuge", name: "huge",
   title: "huge"},
 %{_id: ObjectId(55703854f328cfab505c6d9b), comment: "darui", name: "darui",
   title: "blogger"}]

前回の記事からまったく進歩していないべた書きですね。
その内、モジュールにしたり関数化したら修正します。

to_listしない状態でIO.inspectすると、以下のような表示結果になる。

delete result
%Mongo.Find{batchSize: 0,
 collection: %Mongo.Collection{db: %Mongo.Db{auth: nil,
   mongo: %Mongo.Server{host: '127.0.0.1', id_prefix: 6253, mode: :passive,
    opts: %{}, port: 27017, socket: #Port<0.5607>, timeout: 6000},
   name: "phoenix_bbs", opts: %{mode: :passive, timeout: 6000}},
  name: "comments", opts: %{}}, mods: %{}, mongo: nil, opts: %{},
 projector: %{}, selector: %{}, skip: 0}

以上!!

以下、参考にさせて頂いたサイト様
https://github.com/checkiz/elixir-mongo/blob/master/test/mongo_crud_test.exs
sapporo.beam#66参加者の方々

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