An empty database in everybody's pocket at NG-Poland

Slide 1

Slide 1 text

An empty database in everybody's pocket Phil Nash NG-Poland 2016

Slide 2

Slide 2 text

Phil Nash @philnash http://philna.sh philnash@twilio.com

Slide 3

Slide 3 text

An empty database in everybody's pocket

Slide 4

Slide 4 text

Problems

Slide 5

Slide 5 text

Performance

Slide 6

Slide 6 text

Offline

Slide 7

Slide 7 text

Offline Poor connectivity

Slide 8

Slide 8 text

Offline Poor connectivity Resiliency

Slide 9

Slide 9 text

User experience

Slide 10

Slide 10 text

An empty database in everybody's pocket

Slide 11

Slide 11 text

The options

Slide 12

Slide 12 text

Slide 13

Slide 13 text

LocalStorage

Slide 14

Slide 14 text

LocalStorage localStorage.setItem('NG-Poland', 'Awesome');

Slide 15

Slide 15 text

But...

Slide 16

Slide 16 text

WebSQL?

Slide 17

Slide 17 text

So...

Slide 18

Slide 18 text

IndexedDB

Slide 19

Slide 19 text

IndexedDB has a bad reputation

Slide 20

Slide 20 text

What is IndexedDB?

Slide 21

Slide 21 text

Object store

Slide 22

Slide 22 text

Transactional

Slide 23

Slide 23 text

Asynchronous

Slide 24

Slide 24 text

Same origin policy

Slide 25

Slide 25 text

Demo

Slide 26

Slide 26 text

0:00 / 0:48

Slide 27

Slide 27 text

0:00 / 4:36

Slide 28

Slide 28 text

Open the database let db; const request = indexedDB.open("messagesTest", 1); request.onerror = (err) => console.error(err); request.onupgradeneeded = (event) => { const db = event.target.result; db.createObjectStore("messages", { keyPath: "sid" }); }; request.onsuccess = (event) => { // do other stuff } 01. 02. 03. 04. 05. 06. 07. 08.

Slide 29

Slide 29 text

Add messages to the database const transaction = db.transaction(["messages"], "readwrite"); const objectStore = transaction.objectStore("messages"); const request = objectStore.put(message); request.onsuccess = (event) => console.log(event); 01. 02. 03. 04.

Slide 30

Slide 30 text

Read messages from the database request.onsuccess = (event) => { db = event.target.result; const transaction = db.transaction(["messages"]); const objectStore = transaction.objectStore("messages"); objectStore.openCursor().onsuccess = (event) => { const cursor = event.target.result; if (cursor) { messageList.addMessage(cursor.value); cursor.continue(); } else { renderMessages(messageList); } }; }; 01. 02. 03. 04. 05. 06. 07. 08. 09. 10. 11. 12. 13. 14.

Slide 31

Slide 31 text

There's more!

Slide 32

Slide 32 text

Indexes

Slide 33

Slide 33 text

Indexes 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 34

Slide 34 text

Indexes 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 35

Slide 35 text

Upgrades

Slide 36

Slide 36 text

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

Slide 37

Slide 37 text

Upgrades 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 38

Slide 38 text

Bugs

Slide 39

Slide 39 text

Safari

Slide 40

Slide 40 text

Libraries!

Slide 41

Slide 41 text

idb-keyval localForage idb Dexie PouchDB

Slide 42

Slide 42 text

angular2-indexeddb

Slide 43

Slide 43 text

angular2-indexedDB import {AngularIndexedDB} from 'angular2-indexeddb'; const db = new AngularIndexedDB('messageStore', 1); db.createStore(1, (event) => { const objectStore = event.currentTarget.result; objectStore.createObjectStore('messages', { keyPath: "sid"}); }); 01. 02. 03. 04. 05. 06. 07. 08.

Slide 44

Slide 44 text

angular2-indexedDB db.update('messages', message).then(() => { console.log("yay!"); }, (error) => { console.error("boo!", error); }); 01. 02. 03. 04. 05.

Slide 45

Slide 45 text

angular2-indexedDB db.openCursor('messages', (event) => { const cursor = event.target.result; if(cursor) { // do something with cursor.value cursor.continue(); } else { // render } }); 01. 02. 03. 04. 05. 06. 07. 08. 09.

Slide 46

Slide 46 text

Angular 1?

Slide 47

Slide 47 text

angular-indexedDB

Slide 48

Slide 48 text

An empty database in everybody's pocket

Slide 49

Slide 49 text

IndexedDB enhances the experience

Slide 50

Slide 50 text

Performance

Slide 51

Slide 51 text

Resiliency

Slide 52

Slide 52 text

Let's fill those databases!

Slide 53

Slide 53 text

Thanks! @philnash http://philna.sh philnash@twilio.com