{"id":1919,"date":"2015-04-23T14:27:09","date_gmt":"2015-04-23T14:27:08","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=1919"},"modified":"2015-04-23T14:27:09","modified_gmt":"2015-04-23T14:27:08","slug":"ruby-and-n1ql-first-taste","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/ruby-and-n1ql-first-taste\/","title":{"rendered":"Ruby e SQL para Documentos (anteriormente N1QL): Uma Primeira Prova"},"content":{"rendered":"<p>Os recursos do N1QL est\u00e3o chegando a mais e mais SDKs - agora incluindo o Ruby. Gostaria de fazer uma r\u00e1pida introdu\u00e7\u00e3o sobre como funcionam as consultas estruturadas em Ruby. No momento, a biblioteca n\u00e3o oferece um ODM ou alguma outra abstra\u00e7\u00e3o de alto n\u00edvel, mas praticamente tudo \u00e9 poss\u00edvel de outra forma.<\/p>\n<p>O suporte experimental para N1QL foi adicionado em <a href=\"https:\/\/rubygems.org\/gems\/couchbase\/versions\/1.3.12\">Vers\u00e3o secund\u00e1ria recente 1.3.12<\/a>\u00a0embora seja poss\u00edvel que a API seja alterada na vers\u00e3o final. Nos exemplos abaixo, mostrarei como trabalhar com ela usando <a href=\"https:\/\/github.com\/couchbase\/couchbase-examples\/blob\/master\/travel-sample.zip\">novo conjunto de dados de viagens<\/a>que est\u00e1 no <a href=\"\/blog\/pt\/introducing-developer-preview-for-couchbase-server-4.0\/\">Visualiza\u00e7\u00e3o para desenvolvedores do 4.0<\/a>. Neste blog, estou assumindo que voc\u00ea instalou a vers\u00e3o mais recente do cliente ruby (caso contr\u00e1rio, execute \"<code>gem install -v 1.3.12<\/code>\") e ter um Couchbase Server local com o servi\u00e7o de consulta ativado.<\/p>\n<p>Primeiro, vamos estabelecer uma conex\u00e3o com o bucket:<\/p>\n<pre>\ncb = Couchbase.connect(bucket: &#39;travel-sample&#39;)<\/pre>\n<p>O ponto de entrada para as consultas N1QL \u00e9 <code>Couchbase::Bucket#query<\/code> que aceita uma string em N1QL e retorna um hash com <code>:rows<\/code> e <code>:meta<\/code> onde a resposta do servidor foi entregue. Se houver um problema, a biblioteca levantar\u00e1 <code>Couchbase::Error::Query<\/code> com metadados anexados para analisar o erro.<\/p>\n<p>Por exemplo, vamos criar um \u00edndice prim\u00e1rio para todo o conjunto de dados:<\/p>\n<pre>\ncb.query(\"CREATE PRIMARY INDEX on `travel-sample`\")<\/pre>\n<p>Com o \u00edndice prim\u00e1rio definido, podemos buscar os documentos por suas chaves:<\/p>\n<pre>\ncb.query(&#39;SELECT * FROM `travel-sample` USE KEYS [\"airline_24\"]&#39;)\n# => {:rows=>\n#      [{\"travel-sample\"=>\n#         {\"callsign\"=>\"AMERICAN\",\n#          \"country\"=>\"United States\",\n#          \"iata\"=>\"AA\",\n#          \"icao\"=>\"AAL\",\n#          \"id\"=>24,\n#          \"name\"=>\"American Airlines\",\n#          \"type\"=>\"airline\"}}],\n#     :meta=>\n#      {\"requestID\"=>\"7cc10c30-ecb7-4e65-b582-fe9852e85d5b\",\n#       \"signature\"=>{\"*\"=>\"*\"},\n#       \"results\"=>[],\n#       \"status\"=>\"success\",\n#       \"metrics\"=>\n#        {\"elapsedTime\"=>\"8.308061ms\",\n#         \"executionTime\"=>\"8.206911ms\",\n#         \"resultCount\"=>1,\n#         \"resultSize\"=>306}}}<\/pre>\n<p>Para simplificar os exemplos, podemos usar a seguinte fun\u00e7\u00e3o para remover <code>:meta<\/code> e extrair apenas os valores.<\/p>\n<pre>\ndef strip(doc)\n  doc[:rows]\nend<\/pre>\n<p>Vamos responder a algumas perguntas sobre essa amostra de balde. Como voc\u00ea deve se lembrar, a amostra anterior de dados de cerveja continha cerca de 7 mil documentos, vamos ver quantos documentos esta tem:<\/p>\n<pre>\nstrip cb.query(&#39;SELECT COUNT(*) AS total FROM `travel-sample`&#39;)\n# => [{\"total\"=>31621}]<\/pre>\n<p>Essa \u00e9 uma excelente caixa de areia para nossos experimentos. Que tipo de documentos ela cont\u00e9m?<\/p>\n<pre>\nstrip cb.query(&#39;SELECT type, COUNT(*) AS total FROM `travel-sample` GROUP BY type&#39;)\n# => [{\"total\"=>1969, \"type\"=>\"airport\"},\n#     {\"total\"=>5389, \"type\"=>\"landmark\"},\n#     {\"total\"=>187, \"type\"=>\"airline\"},\n#     {\"total\"=>24076, \"type\"=>\"route\"}]\n<\/pre>\n<p>Como tarefa de casa, voc\u00ea pode explorar mais a estrutura do banco de dados de amostra.  Por enquanto, vamos responder a algumas perguntas mais pr\u00e1ticas. Quais rotas est\u00e3o dispon\u00edveis para algu\u00e9m em Los Angeles que deseja ver a Torre Eiffel em Paris? Uma implementa\u00e7\u00e3o simples poderia ser assim (supondo que voc\u00ea saiba o que significam LAX e CDG).<\/p>\n<pre>\nrequire &#39;date&#39;\n\nroutes = strip cb.query(&#39;\n  SELECT airline.name, route.equipment, route.schedule\n    FROM `travel-sample` route\n    JOIN `travel-sample` airline ON keys route.airlineid\n    WHERE route.sourceairport = \"LAX\" AND route.destinationairport = \"CDG\"\n&#39;)\n\nroutes.each do |route|\n  puts(\"--------------------------\")\n  puts(\"#{route[&#39;name&#39;]} (#{route[&#39;equipment&#39;]})\")\n  puts(\"--------------------------\")\n  route[&#39;schedule&#39;].each do |flight|\n    day = Date::ABBR_DAYNAMES[flight[&#39;day&#39;]]\n    puts(\"#{flight[&#39;flight&#39;]}: #{flight[&#39;utc&#39;]}, #{day}\")\n  end\nend\n<\/pre>\n<p>Se voc\u00ea executar esse c\u00f3digo, obter\u00e1 uma tabela de tempo bem formatada de todas as rotas para ver a famosa torre, conforme mostrado abaixo.\u00a0<\/p>\n<pre>\n--------------------------\nDelta Air Lines (388 772)\n--------------------------\nDL024: 03:23:00, Sun\nDL856: 04:38:00, Sun\nDL124: 06:01:00, Sun\nDL249: 06:00:00, Sun\nDL142: 10:00:00, Mon\nDL757: 10:44:00, Tue\n...\n--------------------------\nAir Tahiti Nui (343)\n--------------------------\nTN070: 06:03:00, Sun\nTN040: 08:39:00, Mon\nTN832: 11:42:00, Tue\nTN752: 08:32:00, Tue\nTN519: 23:33:00, Tue\nTN278: 05:27:00, Tue\nTN325: 18:07:00, Wed\n...\n<\/pre>\n<p>Isso \u00e9 tudo para a introdu\u00e7\u00e3o no momento. Por favor, deixe seu feedback sobre a nova consulta.  Em particular, diga-nos que tipo de suporte a Ruby voc\u00ea gostaria de ver!<\/p>","protected":false},"excerpt":{"rendered":"<p>N1QL features are coming to more and more SDKs&#8211; now including Ruby. I&#39;d like to give a quick intro of how\u00a0structured queries in ruby work. At the moment library does not provide an\u00a0ODM or some other high-level abstraction atop of [&hellip;]<\/p>","protected":false},"author":25,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"ppma_author":[8995],"class_list":["post-1919","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO v26.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ruby and SQL for Documents (formerly N1QL): A First Taste - The Couchbase Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/ruby-and-n1ql-first-taste\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ruby and SQL for Documents (formerly N1QL): A First Taste\" \/>\n<meta property=\"og:description\" content=\"N1QL features are coming to more and more SDKs&#8211; now including Ruby. 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