Sequel Models many_to_one / one_to_many
In our last post, we discussed simple Sequel models. In this post, we'll talk about and show some more complex models using a many_to_one / one_to_many relationship. Here, we're going to revisit the countries we used earlier and add cities to the countries. In this case a country can have many cities, but a city will belong to only a single country. Other examples of this many_to_one / one_to_many
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概è¦MySQLã§æ–‡å—列を検索対象ã«ã—ãŸå ´åˆã€ä¸€èˆ¬çš„ãªãƒ‡ãƒ•ã‚©ãƒ«ãƒˆè¨å®šã§ã¯å¤§æ–‡å—・å°æ–‡å—を区別ã—ãªã„。ã“ã®å•é¡Œã«ã—ã£ã‹ã‚Šãƒãƒžã£ã¦ã—ã¾ã£ãŸã®ã§ã€èª¿æŸ»ã¨å¯¾ç–ã‚’è¡Œã£ãŸãƒ¡ãƒ¢ã‚’æ™’ã™ã“ã¨ã«ã—ãŸã€‚ 基本的ãªã“ã¨ãŒã‚‰ãªã®ã«ã‚‚ã®ã™ã”ãé•·ã„ã®ã§ã€Œãƒ€ã‚¤ã‚¸ã‚§ã‚¹ãƒˆã€ã‚’èªã‚“ã§ã„ãŸã ã‘ã‚Œã°ãŠãŠã‚€ãOKã«ã—ã¦ã‚る。検証éŽç¨‹ã«èˆˆå‘³ã®ã‚ã‚‹æ–¹ã¯ãã®ç¶šãã‚’ã©ã†ãžã€‚ ダイジェストMySQLã¯ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã§é‹ç”¨ã™ã‚‹ã¨æ–‡å—列ã®æ¯”較 / 並ã³æ›¿ãˆã§å¤§æ–‡å— / å°æ–‡å—を区別ã—ãªã„。 大文å—å°æ–‡å—を区別ã—ã¦æ¤œç´¢ã™ã‚‹ã«ã¯â€¦ テーブルå˜ä½ã‚«ãƒ©ãƒ å˜ä½ã‚¯ã‚¨ãƒªå˜ä½â€¦ã§ã®å¯¾å¿œãŒå¯èƒ½ã€‚ データ定義テーブルå˜ä½ -- CREATE TABLE時ã«ãƒ†ãƒ¼ãƒ–ルã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆæ–‡å—コードã¨ç…§åˆé †åºã‚’指定ã™ã‚‹ CREATE TABLE hoge1 ( id INTEGER PRIMARY KEY AUTO_INCREMENT, str VARCHAR(16) ) ENGINE
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Open a database require 'rubygems' require 'sequel' DB = Sequel.sqlite 'my_blog.db' DB = Sequel.connect('postgres://user:password@localhost/my_db') DB = Sequel.mysql 'my_db', :user => 'user', :password => 'password', :host => 'localhost' DB = Sequel.ado 'mydb' Open an SQLite memory database Without a filename argument, the sqlite adapter will setup a new sqlite database in RAM. DB = Sequel.sqlite
File: migration.rdoc [Sequel: The Database Toolkit for Ruby]
Migrations This guide is based on guides.rubyonrails.org/migrations.html Overview Migrations make it easy to alter your database’s schema in a systematic manner. They make it easier to coordinate with other developers and make sure that all developers are using the same database schema. Migrations are optional, you don’t have to use them. You can always just create the necessary database structure
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下記ã®ãƒšãƒ¼ã‚¸ã‚’å‚考ã«Sequelã®ä½¿ã„方を勉強ã™ã‚‹ã€‚ README.rdoc Sequelã®ç°¡å˜ãªä½¿ã„æ–¹ 例文ã«è‡ªåˆ†ãªã‚Šã®è§£èª¬ã‚’è¿½åŠ ã™ã‚‹ã¨ä¸‹è¨˜ã®ã‚ˆã†ã«ãªã£ãŸã€‚ require 'rubygems' require 'sequel' DB = Sequel.sqlite # メモリ上ã®ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã«ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹ã‚ªãƒ–ジェクト「DBã€ã‚’ä½œæˆ # itemsã¨ã„ã†ãƒ†ãƒ¼ãƒ–ルを作æˆã€‚ DB.create_table :items do primary_key :id # プライマリã‚ーã¨ãªã‚‹Intåž‹ã®åˆ—「idã€ã‚’ä½œæˆ String :name # Stringåž‹ã®åˆ—「nameã€ã‚’ä½œæˆ Float :price # Floatåž‹ã®åˆ—「priceã€ã‚’ä½œæˆ end items = DB[:items] # テーブル「itemsã€ã«ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’ä½œæˆ # テーブル「itemsã€ã«ãƒ¬ã‚³ãƒ¼ãƒ‰ã‚’挿入 i
Sequelã§Timestampsプラグインを使ã†
Sequelã§ã€ãƒ¢ãƒ‡ãƒ«ã®æ›´æ–°æ™‚ã«è‡ªå‹•ã§æ›´æ–°æ—¥æ™‚を挿入ã™ã‚‹ã«ã¯ã€Timestampsプラグインを使ã†ã€‚ã‚らã‹ã˜ã‚ã€created_at, updated_atカラムを作æˆã—ã¦ãŠã„ã¦ã€ãƒ¢ãƒ‡ãƒ«ã®ãªã‹ã§ãƒ—ラグインを呼ã³å‡ºã™ã€‚åž‹ã¯datetimeã§ä½œæˆã™ã‚‹ã€‚ 使ã„æ–¹ã¯ã“ã‚“ãªã‹ã‚“ã˜ã€‚ class Item < Sequel::Model(:items) plugin :timestamps, :update_on_create => true end :updated_on_createã¯ã€ãƒ¢ãƒ‡ãƒ«ã®ä½œæˆæ™‚ã«ã‚‚updated_atã‚’æ›´æ–°ã™ã‚‹ã‚ªãƒ—ション。 Rdoc Sequel::Plugins::Timestamps
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Rubyã«ãŠã‘る軽é‡ãªãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ãƒ„ールã‚ットã¨ã—ã¦ã€ãªã‹ãªã‹ãŠæ‰‹è»½ãªSequelã§ã™ãŒã€å®Ÿéš›ã«ä½¿ã†ã«ã‚ãŸã£ã¦ã„ãã¤ã‹æ‚©ã‚“ã ãƒã‚¤ãƒ³ãƒˆãŒã‚ã£ãŸã®ã§ã€å‚™å¿˜éŒ²ã¨ã—ã¦ãã®è§£æ±ºæ³•ã‚’メモã—ã¦ãŠãã¾ã™ã€‚ ãªãŠã€ã“ã®è¨˜äº‹ã¯Ruby 1.9.1p378ã¨Sequel 3.8.0ã®çµ„ã¿åˆã‚ã›ã‚’対象ã¨ã—ã¦æ›¸ã„ã¦ã„ã¾ã™ã€‚ モデルã®å®šç¾©å‰ã«DB接続をã—ãŸããªã„ Sequelã«ã‚‚ActiveRecordパターンã«åŸºã¥ã„ãŸãƒ¢ãƒ‡ãƒ«ã®ä»•çµ„ã¿ãŒç”¨æ„ã•ã‚Œã¦ã„ã¾ã™ãŒã€ã€Œãƒ¢ãƒ‡ãƒ«ã‚’定義ã—ãŸæ™‚点ã§ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã¸ã®æŽ¥ç¶šãŒå˜åœ¨ã—ã¦ã„ãªã‘ã‚Œã°ãªã‚‰ãªã„ã€ã¨ã„ã†åˆ¶ç´„ãŒã‚ã‚Šã¾ã™ã€‚ ã¤ã¾ã‚Šã€ require 'sequel' Sequel.connect('sqlite://test.db') class User < Sequel::Model; end p User.all ã¯å‹•ãã¾ã™ãŒã€ require 'sequel' class User
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How to run raw SQL queries with Sequel
File: README — Documentation for sequel (5.83.0)
Sequel::Schema::Generator
More complicated Sequel selections
Sequel
Sequel::Plugins::Schema::ClassMethods
DIARY SYSTEM Ver.4
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