An empty database in everybody's pocket at JSDay

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A empt databas i everybod ' pocke Phil Nash JSDay 2017 | #jsday

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Phi Nas @philnash http://philna.sh [email protected]

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A empt databas i everybod ' pocke

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Problem

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Performanc

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O lin

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O lin Poo connectivit

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O lin Poo connectivit Resilienc

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Use experienc

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Progressiv We Ap

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...ar no enoug

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A empt databas i everybod ' pocke

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Th option

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LocalStorag

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LocalStorag localStorage.setItem('JSDay', 'Awesome'); localStorage.getItem('JSDay'); // 'Awesome' localStorage.removeItem('JSDay'); 01. 02. 03. 04.

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Bu ...

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LocalStorag • Synchronous • Too simple setItem('object', JSON.stringify(object)) • Slow

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WebSQL?

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S ...

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IndexedDB

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IndexedDB ha ba reputatio

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Wha i IndexedDB?

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Objec stor

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Transactiona

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Asynchronou

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Sam origi polic

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Dem

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Ther ' mor !

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Indexe

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Indexe request.onupgradeneeded = (event) => { const db = event.target.result; const objectStore = db.createObjectStore('messages', { keyPath: 'sid' }); objectStore.createIndex('dateUpdated', 'dateUpdated'); }; 01. 02. 03. 04. 05. 06. 07.

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Indexe const transaction = db.transaction(['messages']); const objectStore = transaction.objectStore('messages'); const index = objectStore.index('dateUpdated'); index.openCursor().onsuccess = (event) => { // do stuff } 01. 02. 03. 04. 05. 06.

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Upgrade

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Upgrade request.onupgradeneeded = (event) => { const db = event.target.result; db.createObjectStore("messages", { keyPath: "sid" }); }; 01. 02. 03. 04.

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Upgrade request.onupgradeneeded = (event) => { const db = event.target.result; if (event.oldVersion < 1) { db.createObjectStore("messages", { keyPath: "sid" }); } if (event.oldVersion < 2) { db.createObjectStore("channels", { keyPath: "sid" }); } }; 01. 02. 03. 04. 05. 06. 07. 08. 09.

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Safar

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Librarie !

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id -keyva localForag id Dexi PouchDB

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Dexi const dexie = new Dexie("messageStore"); dexie.version(1).stores({ messages: 'sid,dateUpdated' }); 01. 02. 03. 04.

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Dexi dexie.open().then((db) => { db.messages.where("sid").equals(key) .then((message) => { console.log(message.body); }); }); 01. 02. 03. 04.

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A empt databas i everybod ' pocke

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IndexedDB hel t enhanc th experienc

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Performanc

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Resilienc

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Le ' l th s database !

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https://joind.in/talk/04cff

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Thank ! @philnash http://philna.sh [email protected] https://joind.in/talk/04cff