An empty database in everybody's pocket at 4Developers

Slide 1

Slide 1 text

A empt databas i everybod ' pocke Phil Nash 4Developers 2017

Slide 2

Slide 2 text

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

Slide 3

Slide 3 text

A empt databas i everybod ' pocke

Slide 4

Slide 4 text

Problem

Slide 5

Slide 5 text

Performanc

Slide 6

Slide 6 text

O lin

Slide 7

Slide 7 text

O lin Poo connectivit

Slide 8

Slide 8 text

O lin Poo connectivit Resilienc

Slide 9

Slide 9 text

Use experienc

Slide 10

Slide 10 text

Progressiv We Ap

Slide 11

Slide 11 text

A empt databas i everybod ' pocke

Slide 12

Slide 12 text

Th option

Slide 13

Slide 13 text

Slide 14

Slide 14 text

LocalStorag

Slide 15

Slide 15 text

LocalStorag localStorage.setItem('FEL', 'Awesome');

Slide 16

Slide 16 text

Bu ...

Slide 17

Slide 17 text

WebSQL?

Slide 18

Slide 18 text

S ...

Slide 19

Slide 19 text

IndexedDB

Slide 20

Slide 20 text

IndexedDB ha ba reputatio

Slide 21

Slide 21 text

Wha i IndexedDB?

Slide 22

Slide 22 text

Objec stor

Slide 23

Slide 23 text

Transactiona

Slide 24

Slide 24 text

Asynchronou

Slide 25

Slide 25 text

Sam origi polic

Slide 26

Slide 26 text

Dem

Slide 27

Slide 27 text

Ther ' mor !

Slide 28

Slide 28 text

Indexe

Slide 29

Slide 29 text

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.

Slide 30

Slide 30 text

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.

Slide 31

Slide 31 text

Upgrade

Slide 32

Slide 32 text

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

Slide 33

Slide 33 text

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.

Slide 34

Slide 34 text

Slide 35

Slide 35 text

Safar

Slide 36

Slide 36 text

Librarie !

Slide 37

Slide 37 text

id -keyva localForag id Dexi PouchDB

Slide 38

Slide 38 text

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

Slide 39

Slide 39 text

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