{"id":1545,"date":"2024-09-16T20:18:25","date_gmt":"2024-09-16T23:18:25","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=1545"},"modified":"2025-11-25T16:37:10","modified_gmt":"2025-11-25T19:37:10","slug":"dados-off-line-em-pwa","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/dados-off-line-em-pwa\/","title":{"rendered":"Dados Off-line em PWA"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Dados Off-line em PWA<\/strong>: Para que um <strong>Progressive Web App (PWA)<\/strong> seja verdadeiramente <strong>confi\u00e1vel (<em>reliable<\/em>)<\/strong>, ele precisa n\u00e3o apenas do <em>App Shell<\/em> est\u00e1tico (CSS, JS) em cache, mas tamb\u00e9m da capacidade de armazenar e gerenciar <strong>dados din\u00e2micos<\/strong> para o modo <em>offline<\/em>. \u00c9 aqui que entra o <strong>IndexedDB<\/strong>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O <strong>IndexedDB<\/strong> \u00e9 uma API de armazenamento no lado do cliente que funciona como um <strong>banco de dados NoSQL<\/strong> embutido no navegador. Ele \u00e9 ideal para grandes volumes de dados estruturados, fornecendo a base para o funcionamento completo de um PWA, mesmo sem conectividade.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">1. \ud83c\udd9a IndexedDB vs. Outras APIs de Armazenamento<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Embora existam outras APIs, o IndexedDB \u00e9 a escolha padr\u00e3o para PWAs focados em dados complexos:<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>API<\/strong><\/td><td><strong>Modelo<\/strong><\/td><td><strong>Capacidade de Armazenamento<\/strong><\/td><td><strong>Tipo de Opera\u00e7\u00e3o<\/strong><\/td><td><strong>Ideal Para&#8230;<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>IndexedDB<\/strong><\/td><td>Objeto\/Chave<\/td><td>Gigabytes (Alto)<\/td><td><strong>Ass\u00edncrona (Promises)<\/strong><\/td><td>Dados Estruturados, Aplica\u00e7\u00f5es complexas.<\/td><\/tr><tr><td><strong>Local Storage<\/strong><\/td><td>Chave-Valor<\/td><td>Kilobytes (Baixo)<\/td><td>S\u00edncrona<\/td><td>Prefer\u00eancias de usu\u00e1rio, Tokens simples.<\/td><\/tr><tr><td><strong>Cache API<\/strong><\/td><td>Request-Response<\/td><td>Alto<\/td><td>Ass\u00edncrona (Promises)<\/td><td>Arquivos est\u00e1ticos (Assets).<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Foco:<\/strong> IndexedDB \u00e9 o \u00fanico que oferece a capacidade, o modelo de dados e a natureza ass\u00edncrona necess\u00e1rios para armazenar um cat\u00e1logo de produtos ou um hist\u00f3rico de mensagens.<\/p>\n<\/blockquote>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">2. \ud83c\udfdb\ufe0f Estrutura do IndexedDB<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A arquitetura do IndexedDB segue um modelo semelhante ao de bancos de dados:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Banco de Dados (<code>Database<\/code>):<\/strong> O cont\u00eainer principal (ex: <code>'meu-app-db'<\/code>). \u00c9 aberto por vers\u00e3o.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Object Stores (<code>ObjectStore<\/code>):<\/strong> Onde os dados s\u00e3o realmente armazenados, semelhante a tabelas em um banco relacional (ex: <code>'usuarios'<\/code>, <code>'produtos'<\/code>).<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>\u00cdndices (<code>Indexes<\/code>):<\/strong> Usados para acelerar a busca de dados que n\u00e3o sejam pela chave prim\u00e1ria.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Transa\u00e7\u00f5es (<code>Transactions<\/code>):<\/strong> Garantem que as opera\u00e7\u00f5es (leitura\/escrita) sejam at\u00f4micas, mantendo a integridade dos dados.<\/li>\n<\/ol>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">3. \u2699\ufe0f Opera\u00e7\u00f5es B\u00e1sicas (Sintaxe Moderna com Promises)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O IndexedDB \u00e9 baseado em requisi\u00e7\u00f5es (<code>request.onsuccess<\/code>, <code>request.onerror<\/code>), que s\u00e3o naturalmente ass\u00edncronas. Bibliotecas externas (como Dexie.js) ou fun\u00e7\u00f5es <em>wrapper<\/em> s\u00e3o frequentemente usadas para convert\u00ea-lo em sintaxe moderna baseada em <code>Promise<\/code>\/<code>async\/await<\/code>.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">A. Criando e Abrindo o Banco de Dados<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O <code>onupgradeneeded<\/code> \u00e9 o \u00fanico local onde voc\u00ea pode criar ou alterar a estrutura do banco (<code>Object Stores<\/code>). Ele \u00e9 chamado se a vers\u00e3o fornecida (<code>1<\/code>) for maior que a vers\u00e3o atual do banco de dados do navegador.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const DB_NAME = 'meu-pwa-db';\nconst STORE_NAME = 'produtos';\n\nconst openDB = () =&gt; {\n  return new Promise((resolve, reject) =&gt; {\n    const request = window.indexedDB.open(DB_NAME, 1);\n\n    request.onerror = (event) =&gt; reject('Erro ao abrir DB.');\n    \n    request.onsuccess = (event) =&gt; resolve(event.target.result);\n\n    request.onupgradeneeded = (event) =&gt; {\n      const db = event.target.result;\n      \/\/ Cria a Object Store, definindo 'id' como chave prim\u00e1ria\n      db.createObjectStore(STORE_NAME, { keyPath: 'id' }); \n    };\n  });\n};\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">B. Escrevendo Dados (Adicionar\/Atualizar)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Todas as opera\u00e7\u00f5es de escrita precisam de uma <strong>Transa\u00e7\u00e3o<\/strong> no modo <code>'readwrite'<\/code>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Exemplo de como adicionar\/atualizar dados (put)\nasync function putData(data) {\n  const db = await openDB();\n  \/\/ Inicia a transa\u00e7\u00e3o de leitura\/escrita\n  const transaction = db.transaction(STORE_NAME, 'readwrite');\n  const store = transaction.objectStore(STORE_NAME);\n\n  return new Promise((resolve, reject) =&gt; {\n    const request = store.put(data);\n    \n    request.onsuccess = () =&gt; resolve('Dado salvo com sucesso.');\n    request.onerror = (event) =&gt; reject(event.target.error);\n\n    \/\/ Opcional: Garante que a Promise s\u00f3 resolva ap\u00f3s a transa\u00e7\u00e3o ser conclu\u00edda\n    transaction.oncomplete = resolve; \n  });\n}\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">C. Lendo Dados (Busca por Chave)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A leitura requer uma transa\u00e7\u00e3o no modo padr\u00e3o <code>'readonly'<\/code>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Exemplo de busca de dados por chave prim\u00e1ria (id)\nasync function getDataById(id) {\n  const db = await openDB();\n  const transaction = db.transaction(STORE_NAME, 'readonly');\n  const store = transaction.objectStore(STORE_NAME);\n\n  return new Promise((resolve, reject) =&gt; {\n    const request = store.get(id);\n\n    request.onsuccess = (event) =&gt; resolve(event.target.result);\n    request.onerror = (event) =&gt; reject(event.target.error);\n  });\n}\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\u2705 Conclus\u00e3o<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Dados Off-line em PWA<\/strong>: O <strong>IndexedDB<\/strong> \u00e9 a solu\u00e7\u00e3o fundamental para a persist\u00eancia de grandes volumes de <strong>dados estruturados<\/strong> em PWAs. Ao contr\u00e1rio do Local Storage, ele \u00e9 ass\u00edncrono e robusto, sendo a tecnologia ideal para construir a camada de dados <em>offline<\/em> da sua aplica\u00e7\u00e3o. Dominar a cria\u00e7\u00e3o do <strong>Banco de Dados<\/strong>, <strong>Object Stores<\/strong> e o uso de <strong>Transa\u00e7\u00f5es<\/strong> permite que voc\u00ea crie experi\u00eancias de usu\u00e1rio que permanecem ricas e funcionais, mesmo quando a conex\u00e3o com a internet falha.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Toda jornada tem um in\u00edcio, e o in\u00edcio para se tornar um desenvolvedor web \u00e9 dominar as seguintes tecnologias, que voc\u00ea encontra aqui mesmo:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/html\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp\" alt=\"HTML\" class=\"wp-image-600\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">HTML<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/css\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp\" alt=\"CSS\" class=\"wp-image-702\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">CSS<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/javascript\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp\" alt=\"Javascript\" class=\"wp-image-804\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">JavaScript<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">E se voc\u00ea gosta do nosso conte\u00fado, n\u00e3o deixe de contribuir adquirindo os servi\u00e7os e produtos dos nossos apoiadores e empresas que somos associados:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/hostinger.com.br\/?REFERRALCODE=1THIAGO62\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/03\/hostinger.png\" alt=\"Hospedagem Hostinger\" class=\"wp-image-92\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNDYlc\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/ofertas-amazon.webp\" alt=\"Ofertas Amazon\" class=\"wp-image-1308\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNKmt0\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/amazonprime.webp\" alt=\"Amazon Prime\" class=\"wp-image-1307\"\/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>Dados Off-line em PWA: Para que um Progressive Web App (PWA) seja verdadeiramente confi\u00e1vel (reliable),&#8230;<\/p>\n","protected":false},"author":1,"featured_media":1497,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-1545","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pwa","wpcat-16-id"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dados Off-line em PWA - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Dados Off-line em PWA: PWAs oferecem uma experi\u00eancia de usu\u00e1rio rica e semelhante a aplicativos nativos, permitindo que os usu\u00e1rios ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thiagorossi.com.br\/blog\/dados-off-line-em-pwa\/\" \/>\n<meta property=\"og:locale\" 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