{"id":2478,"date":"2017-01-10T15:00:00","date_gmt":"2017-01-10T15:00:00","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2478"},"modified":"2025-06-13T21:22:44","modified_gmt":"2025-06-14T04:22:44","slug":"using-pouchdb-and-couchbase-nosql-in-your-nodejs-web-application","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/using-pouchdb-and-couchbase-nosql-in-your-nodejs-web-application\/","title":{"rendered":"Uso do PouchDB e do Couchbase NoSQL em seu aplicativo da Web Node.js"},"content":{"rendered":"<p>Uma das minhas tecnologias preferidas para o desenvolvimento de aplicativos da Web \u00e9 o Node.js. Como desenvolvo muito em JavaScript, essa \u00e9 outra pe\u00e7a que se encaixa no meu quebra-cabe\u00e7a de desenvolvimento. H\u00e1 pouco tempo, escrevi um guia para <a href=\"https:\/\/www.couchbase.com\/blog\/pt\/using-couchbase-server-and-couchbase-mobile-in-the-same-project-with-nodejs\/\">usar o Couchbase Mobile e o Couchbase Node.js SDK na mesma pilha<\/a>. Naquele artigo, mencionei que h\u00e1 v\u00e1rias maneiras diferentes de realizar essa tarefa. Pensei em elaborar outra maneira de realizar o trabalho, desta vez usando <a href=\"https:\/\/pouchdb.com\/\">PouchDB<\/a>.<\/p>\n<p>O PouchDB \u00e9 um banco de dados JavaScript que funciona em conjunto com o Couchbase Sync Gateway e o Couchbase Server. Por ser JavaScript, voc\u00ea pode us\u00e1-lo em seus aplicativos baseados em navegador e no lado do servidor.<\/p>\n<h2 id=\"the-requirements\">Os requisitos<\/h2>\n<p>Como este \u00e9 um aplicativo JavaScript, n\u00e3o haver\u00e1 muitas depend\u00eancias de software. As poucas que existem s\u00e3o as seguintes:<\/p>\n<ul>\n<li>Node.js 4.0+<\/li>\n<li><a href=\"https:\/\/www.couchbase.com\/blog\/pt\/nosql-databases\/downloads\/\">Gateway de sincroniza\u00e7\u00e3o do Couchbase<\/a><\/li>\n<\/ul>\n<p>Este \u00e9 um aplicativo Node.js, mas o Node Package Manager (NPM) \u00e9 o que far\u00e1 a maior parte do trabalho pesado quando se trata de preparar nosso projeto. Ele obter\u00e1 o PouchDB e as depend\u00eancias restantes. Usaremos o Couchbase Sync Gateway <a href=\"https:\/\/www.couchbase.com\/blog\/pt\/resources\/concepts\/in-memory-database\/\">banco de dados na mem\u00f3ria<\/a> porque este \u00e9 apenas um aplicativo de exemplo. Na produ\u00e7\u00e3o, voc\u00ea desejar\u00e1 conectar o Sync Gateway ao Couchbase Server para armazenamento persistente.<\/p>\n<h2 id=\"configuring-couchbase-sync-gateway-for-data-synchronization\">Configura\u00e7\u00e3o do Couchbase Sync Gateway para sincroniza\u00e7\u00e3o de dados<\/h2>\n<p>O Sync Gateway manipular\u00e1 todos os nossos dados remotos antes e depois de chegarem ao Couchbase Server. Ele \u00e9 o nosso servi\u00e7o intermedi\u00e1rio que orquestrar\u00e1 os dados entre plataformas, dispositivos etc. Ele n\u00e3o \u00e9 um requisito para a cria\u00e7\u00e3o de aplicativos Node.js que funcionem com o Couchbase Server. Estamos usando-o porque desejamos oferecer suporte \u00e0 sincroniza\u00e7\u00e3o m\u00f3vel tamb\u00e9m, embora isso n\u00e3o seja demonstrado neste exemplo.<\/p>\n<p>Com o download e a instala\u00e7\u00e3o do Couchbase Sync Gateway, precisamos estabelecer uma configura\u00e7\u00e3o para carregar no tempo de execu\u00e7\u00e3o. Crie um arquivo chamado <strong>sync-gateway-config.json<\/strong> e incluem o seguinte:<\/p>\n<pre><code>{\r\n    \"log\":[\"CRUD+\", \"REST+\", \"Changes+\", \"Attach+\"],\r\n    \"databases\": {\r\n        \"example\": {\r\n            \"server\":\"walrus:\",\r\n            \"sync\":`\r\n                function (doc) {\r\n                    channel (doc.channels);\r\n                }\r\n            `,\r\n            \"users\": {\r\n                \"GUEST\": {\r\n                    \"disabled\": false,\r\n                    \"admin_channels\": [\"*\"]\r\n                }\r\n            }\r\n        }\r\n    },\r\n    \"CORS\": {\r\n        \"Origin\": [\"https:\/\/localhost:3000\"],\r\n        \"LoginOrigin\": [\"https:\/\/localhost:3000\"],\r\n        \"Headers\": [\"Content-Type\"],\r\n        \"MaxAge\": 17280000\r\n    }\r\n}<\/code><\/pre>\n<p>No arquivo de configura\u00e7\u00e3o muito b\u00e1sico acima, estabelecemos um banco de dados chamado <strong>exemplo<\/strong> que usa a op\u00e7\u00e3o de armazenamento do Sync Gateway na mem\u00f3ria. N\u00e3o h\u00e1 permiss\u00f5es espec\u00edficas de leitura ou grava\u00e7\u00e3o nessa configura\u00e7\u00e3o, o que significa que todos os dados existir\u00e3o no mesmo canal.<\/p>\n<p>Como estamos executando o Sync Gateway e nosso exemplo de Node.js a ser criado em breve no mesmo computador, mas em portas diferentes, precisamos permitir o compartilhamento de recursos entre origens (CORS). Se n\u00e3o o fizermos, acabaremos com erros relacionados ao JavaScript. Na configura\u00e7\u00e3o acima, estamos dizendo que queremos permitir a comunica\u00e7\u00e3o de https:\/\/localhost:3000, que \u00e9 o nosso aplicativo Node.js.<\/p>\n<p>Nesse ponto, o Sync Gateway pode ser executado. Em um ambiente de produ\u00e7\u00e3o, o sistema in-memory <strong>morsa<\/strong> pode ser substitu\u00eddo pelo nome do host de um determinado cluster do Couchbase Server.<\/p>\n<h2 id=\"developing-the-node.js-web-application\">Desenvolvimento do aplicativo da Web Node.js<\/h2>\n<p>Para facilitar a compreens\u00e3o, vamos criar um aplicativo Node.js novo e trabalhar em seu desenvolvimento. Isso pode ser feito usando o Node Package Manager.<\/p>\n<p>No prompt de comando ou no terminal, execute o seguinte:<\/p>\n<pre><code>npm init --y<\/code><\/pre>\n<p>O comando acima criar\u00e1 um arquivo <strong>package.json<\/strong> que manter\u00e1 todas as depend\u00eancias do nosso projeto. Com o arquivo <strong>package.json<\/strong> no lugar, vamos obter algumas depend\u00eancias:<\/p>\n<pre><code>npm install express body-parser pouchdb --save<\/code><\/pre>\n<p>O comando acima instalar\u00e1 o Express Framework, um pacote necess\u00e1rio para tratar os dados do corpo nas solicita\u00e7\u00f5es, e o PouchDB para gerenciar os dados do nosso aplicativo.<\/p>\n<p>Antes de come\u00e7armos a escrever o c\u00f3digo, precisamos criar um arquivo chamado <strong>app.js<\/strong> que conter\u00e1 toda a l\u00f3gica do nosso aplicativo.<\/p>\n<h3 id=\"bootstrapping-the-restful-api\">Inicializa\u00e7\u00e3o da API RESTful<\/h3>\n<p>Com o <strong>app.js<\/strong> criado, abra-o e inclua o seguinte c\u00f3digo JavaScript:<\/p>\n<pre><code>var Express = require(\"express\");\r\nvar BodyParser = require(\"body-parser\");\r\nvar PouchDB = require(\"pouchdb\");\r\n\r\nvar app = Express();\r\n\r\napp.use(BodyParser.json());\r\napp.use(BodyParser.urlencoded({ extended: true }));\r\n\r\nvar database = new PouchDB(\"https:\/\/192.168.57.1:4984\/example\");\r\n\r\napp.get(\"\/people\", function(req, res) { });\r\n\r\napp.get(\"\/people\/:id\", function(req, res) { });\r\n\r\napp.post(\"\/people\", function(req, res) { });\r\n\r\napp.delete(\"\/people\", function(req, res) { });\r\n\r\nvar server = app.listen(3000, function() {\r\n    database.info().then(function(info) {\r\n        console.log(info);\r\n        console.log(\"Listening on port %s...\", server.address().port);\r\n    });\r\n});<\/code><\/pre>\n<p>Ent\u00e3o, o que est\u00e1 acontecendo no c\u00f3digo acima? Em primeiro lugar, estamos importando as depend\u00eancias que foram instaladas anteriormente e as estamos inicializando.<\/p>\n<p>Como este \u00e9 um aplicativo do lado do servidor, temos duas op\u00e7\u00f5es quando se trata de usar o PouchDB. Podemos criar um banco de dados local em nosso servidor de aplicativos que sincroniza com o Sync Gateway ou podemos nos conectar diretamente \u00e0 inst\u00e2ncia do Sync Gateway.<\/p>\n<pre><code>var database = new PouchDB(\"https:\/\/192.168.57.1:4984\/example\");<\/code><\/pre>\n<p>A informa\u00e7\u00e3o acima indica que vamos nos conectar diretamente ao nosso servidor Sync Gateway em execu\u00e7\u00e3o local. Voc\u00ea pode escolher a op\u00e7\u00e3o de sincroniza\u00e7\u00e3o se quiser adotar uma abordagem diferente no balanceamento de carga.<\/p>\n<pre><code>app.get(\"\/people\", function(req, res) { });\r\napp.get(\"\/people\/:id\", function(req, res) { });\r\napp.post(\"\/people\", function(req, res) { });\r\napp.delete(\"\/people\", function(req, res) { });<\/code><\/pre>\n<p>Estaremos criando uma API RESTful que usa CRUD, mas, por enquanto, faz sentido apenas definir cada um dos pontos de extremidade que desejamos usar no Express Framework.<\/p>\n<p>Por fim, definimos como queremos atender ao aplicativo:<\/p>\n<pre><code>var server = app.listen(3000, function() {\r\n    database.info().then(function(info) {\r\n        console.log(info);\r\n        console.log(\"Listening on port %s...\", server.address().port);\r\n    });\r\n});<\/code><\/pre>\n<p>Vamos servir o aplicativo em https:\/\/localhost:3000 e, quando o servidor for inicializado, imprimiremos informa\u00e7\u00f5es sobre o PouchDB. Isso nos ajudar\u00e1 a ter uma ideia sobre a conex\u00e3o e os dados existentes.<\/p>\n<h3 id=\"including-the-pouchdb-data-manipulation-logic\">Incluindo a l\u00f3gica de manipula\u00e7\u00e3o de dados do PouchDB<\/h3>\n<p>Com o aplicativo inicializado, podemos come\u00e7ar a aplicar a l\u00f3gica do aplicativo a cada um dos m\u00e9todos de endpoint. Come\u00e7ando com o endpoint de lista, temos o seguinte:<\/p>\n<pre><code>app.get(\"\/people\", function(req, res) {\r\n    database.allDocs({include_docs: true}).then(function(result) {\r\n        res.send(result.rows.map(function(item) {\r\n            return item.doc;\r\n        }));\r\n    }, function(error) {\r\n        res.status(400).send(error);\r\n    });\r\n});<\/code><\/pre>\n<p>Quando o ponto de extremidade for atingido, consultaremos todos os documentos e incluiremos as propriedades do documento nos resultados. Para ignorar as informa\u00e7\u00f5es que podem n\u00e3o ser \u00fateis para n\u00f3s, podemos mapear a resposta antes de retorn\u00e1-la; caso contr\u00e1rio, podemos retornar um erro.<\/p>\n<p>Em vez de listar todos os documentos, talvez queiramos obter um \u00fanico documento.<\/p>\n<pre><code>app.get(\"\/people\/:id\", function(req, res) {\r\n    if(!req.params.id) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"An `id` is required\"});\r\n    }\r\n    database.get(req.params.id).then(function(result) {\r\n        res.send(result);\r\n    }, function(error) {\r\n        res.status(400).send(error);\r\n    });\r\n});<\/code><\/pre>\n<p>No cen\u00e1rio acima, esperamos que um ID de documento seja inclu\u00eddo na solicita\u00e7\u00e3o. Se o ID existir, tentaremos obter um documento e devolv\u00ea-lo ao solicitante; caso contr\u00e1rio, retornaremos um erro.<\/p>\n<p>Que tal criar novos documentos?<\/p>\n<p>Para criar documentos dentro do Couchbase, far\u00edamos algo como o seguinte:<\/p>\n<pre><code>app.post(\"\/people\", function(req, res) {\r\n    if(!req.body.firstname) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"A `firstname` is required\"});\r\n    } else if(!req.body.lastname) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"A `lastname` is required\"});\r\n    }\r\n    database.post(req.body).then(function(result) {\r\n        res.send(result);\r\n    }, function(error) {\r\n        res.status(400).send(error);\r\n    });\r\n});<\/code><\/pre>\n<p>No c\u00f3digo acima, estamos esperando um <code>primeiro nome<\/code> e um <code>sobrenome<\/code> para existir. Se isso for verdade, criaremos o documento usando todo o corpo da postagem e retornaremos a resposta. N\u00e3o \u00e9 necess\u00e1rio usar todo o corpo da postagem, mas neste exemplo estamos usando. Observe que isso s\u00f3 criar\u00e1 um documento, n\u00e3o o atualizar\u00e1. A atualiza\u00e7\u00e3o dos documentos usaria um <code>colocar<\/code> em vez de um m\u00e9todo <code>postagem<\/code> m\u00e9todo.<\/p>\n<p>A parte final do nosso aplicativo \u00e9 o endpoint para exclus\u00e3o de dados.<\/p>\n<pre><code>app.delete(\"\/people\", function(req, res) {\r\n    if(!req.body.id) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"An `id` is required\"});\r\n    }\r\n    database.get(req.body.id).then(function(result) {\r\n        return database.remove(result);\r\n    }).then(function(result) {\r\n        res.send(result);\r\n    }, function(error) {\r\n        res.status(400).send(error);\r\n    });\r\n});<\/code><\/pre>\n<p>Esperamos que um ID seja passado na solicita\u00e7\u00e3o. Se esse ID existir, primeiro fazemos uma pesquisa para garantir que o documento exista. Se o documento existir, podemos exclu\u00ed-lo. Tudo isso foi realizado com o encadeamento de promessas JavaScript.<\/p>\n<h3 id=\"trying-the-finished-project-source-code\">Experimentando o c\u00f3digo-fonte do projeto finalizado<\/h3>\n<p>Se voc\u00ea quiser ter uma vis\u00e3o mais clara da apar\u00eancia desse aplicativo, o c\u00f3digo completo pode ser visto abaixo.<\/p>\n<pre><code>var Express = require(\"express\");\r\nvar BodyParser = require(\"body-parser\");\r\nvar PouchDB = require(\"pouchdb\");\r\n\r\nvar app = Express();\r\n\r\napp.use(BodyParser.json());\r\napp.use(BodyParser.urlencoded({ extended: true }));\r\n\r\nvar database = new PouchDB(\"https:\/\/192.168.57.1:4984\/example\");\r\n\r\napp.get(\"\/people\", function(req, res) {\r\n    database.allDocs({include_docs: true}).then(function(result) {\r\n        res.send(result.rows.map(function(item) {\r\n            return item.doc;\r\n        }));\r\n    }, function(error) {\r\n        res.status(400).send(error);\r\n    });\r\n});\r\n\r\napp.get(\"\/people\/:id\", function(req, res) {\r\n    if(!req.params.id) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"An `id` is required\"});\r\n    }\r\n    database.get(req.params.id).then(function(result) {\r\n        res.send(result);\r\n    }, function(error) {\r\n        res.status(400).send(error);\r\n    });\r\n});\r\n\r\napp.post(\"\/people\", function(req, res) {\r\n    if(!req.body.firstname) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"A `firstname` is required\"});\r\n    } else if(!req.body.lastname) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"A `lastname` is required\"});\r\n    }\r\n    database.post(req.body).then(function(result) {\r\n        res.send(result);\r\n    }, function(error) {\r\n        res.status(400).send(error);\r\n    });\r\n});\r\n\r\napp.delete(\"\/people\", function(req, res) {\r\n    if(!req.body.id) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"An `id` is required\"});\r\n    }\r\n    database.get(req.body.id).then(function(result) {\r\n        return database.remove(result);\r\n    }).then(function(result) {\r\n        res.send(result);\r\n    }, function(error) {\r\n        res.status(400).send(error);\r\n    });\r\n});\r\n\r\nvar server = app.listen(3000, function() {\r\n    database.info().then(function(info) {\r\n        console.log(info);\r\n        console.log(\"Listening on port %s...\", server.address().port);\r\n    });\r\n});<\/code><\/pre>\n<p>Para executar o aplicativo, voc\u00ea deve executar <code>n\u00f3 app.js<\/code> do Terminal ou do Prompt de Comando e, em seguida, acesse os pontos de extremidade https:\/\/localhost:3000 do cURL ou do aplicativo de sua prefer\u00eancia.<\/p>\n<h2 id=\"conclusion\">Conclus\u00e3o<\/h2>\n<p>Voc\u00ea acabou de ver como incluir o PouchDB em um aplicativo da Web Node.js do lado do servidor em que o PouchDB se comunica com um banco de dados NoSQL Couchbase. Esse foi um dos muitos exemplos diferentes de como voc\u00ea pode incluir dispositivos m\u00f3veis e servidores na mesma pilha porque o Sync Gateway est\u00e1 no meio. Em um <a href=\"https:\/\/www.couchbase.com\/blog\/pt\/using-couchbase-server-and-couchbase-mobile-in-the-same-project-with-nodejs\/\">post anterior<\/a> Escrevi sobre o uso da API RESTful do Sync Gateway em vez do PouchDB. Esse exemplo tamb\u00e9m demonstrou o uso de dispositivos m\u00f3veis e servidores com o Couchbase.<\/p>","protected":false},"excerpt":{"rendered":"<p>One of my preferred technologies for developing web applications is Node.js. I do a lot of JavaScript development, so it is another piece to fit in my development puzzle. Not too long ago I wrote a guide for using Couchbase [&hellip;]<\/p>","protected":false},"author":63,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1815,1810,1816,9327,1822,2366],"tags":[1543,1541],"ppma_author":[9032],"class_list":["post-2478","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-best-practices-and-tutorials","category-couchbase-mobile","category-couchbase-server","category-javascript","category-node-js","category-sync-gateway","tag-javascript","tag-pouchdb"],"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>Using PouchDB and Couchbase NoSQL in Your Node.js Web Application - 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\/using-pouchdb-and-couchbase-nosql-in-your-nodejs-web-application\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using PouchDB and Couchbase NoSQL in Your Node.js Web Application\" \/>\n<meta property=\"og:description\" content=\"One of my preferred technologies for developing web applications is Node.js. 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