普通ã«ActiveRecordã—ã¦ã¿ãŸ - ã‹ãšãã®Blog@hatenaJRubyã§ActiveRecord使ã£ãŸã‚Šã—ã¦ã¿ãŸã‘ã©ã€æ™®é€šã®Rubyã§ã‚‚使ã£ã¦ã¿ãŸã€‚ ã¨ã‚Šã‚ãˆãšã€Rubyã‚’DLã—ã¦ãã¦ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã€‚ gem install railsを実行ã—ã¦ä¸€é€šã‚Šã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« gem postgres-prを実行ã—ã¦PostgreSQLã«ã¤ãªã’ã‚‹ã®ã«å¿…è¦ãªã‚‚ã®ã‚’ゲット 実験ã«ä½¿ã£ãŸãƒ†ãƒ¼ãƒ–ルã¯å‰ã«ä½¿ã£ãŸã‚‚ã®ã¨åŒã˜ã€‚ 一応DDLã‚’ã®ã›ã¦ãŠã create table departments ( id serial primary key, name varchar(50) ); create table employees ( id serial primary key, name varchar(50), department_id int, constraint fk_departments foreign key (department_id) referen
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