Dexie.js Save
A Minimalistic Wrapper for IndexedDB
Dexie.js
Dexie.js is a wrapper library for indexedDB - the standard database in the browser. https://dexie.org
Why?
Dexie solves three main issues with the native IndexedDB API:
- Ambiguous error handling
- Poor queries
- Code complexity
Dexie provides a neat database API with a well thought-through API design, robust error handling, extendability, change tracking awareness and extended KeyRange support (case insensitive search, set matches and OR operations).
Hello World
<!doctype html>
<html>
<head>
<script src="https://unpkg.com/dexie@latest/dist/dexie.js"></script>
<script>
//
// Declare Database
//
var db = new Dexie("FriendDatabase");
db.version(1).stores({
friends: "++id,name,age"
});
//
// Manipulate and Query Database
//
db.friends.add({name: "Josephine", age: 21}).then(function() {
return db.friends.where("age").below(25).toArray();
}).then(function (youngFriends) {
alert ("My young friends: " + JSON.stringify(youngFriends));
}).catch(function (e) {
alert ("Error: " + (e.stack || e));
});
</script>
</head>
</html>
Yes, it's that simple.
An equivalent modern version (works in all modern browsers):
<!doctype html>
<html>
<head>
<script type="module">
import Dexie from "https://unpkg.com/dexie@latest/dist/modern/dexie.mjs";
//
// Declare Database
//
const db = new Dexie("FriendDatabase");
db.version(1).stores({
friends: "++id,name,age"
});
//
// Manipulate and Query Database
//
try {
await db.friends.add({name: "Josephine", age: 21});
const youngFriends = await db.friends.where("age").below(25).toArray();
alert (`My young friends: ${JSON.stringify(youngFriends)}`);
} catch (e) {
alert (`Error: ${e}`);
}
</script>
</head>
</html>
Performance
Dexie has kick-ass performance. Its bulk methods take advantage of a lesser-known feature in IndexedDB that makes it possible to store stuff without listening to every onsuccess event. This speeds up the performance to a maximum.
Supported operations
above(key): Collection;
aboveOrEqual(key): Collection;
add(item, key?): Promise;
and(filter: (x) => boolean): Collection;
anyOf(keys[]): Collection;
anyOfIgnoreCase(keys: string[]): Collection;
below(key): Collection;
belowOrEqual(key): Collection;
between(lower, upper, includeLower?, includeUpper?): Collection;
bulkAdd(items: Array): Promise;
bulkDelete(keys: Array): Promise;
bulkPut(items: Array): Promise;
clear(): Promise;
count(): Promise;
delete(key): Promise;
distinct(): Collection;
each(callback: (obj) => any): Promise;
eachKey(callback: (key) => any): Promise;
eachPrimaryKey(callback: (key) => any): Promise;
eachUniqueKey(callback: (key) => any): Promise;
equals(key): Collection;
equalsIgnoreCase(key): Collection;
filter(fn: (obj) => boolean): Collection;
first(): Promise;
get(key): Promise;
inAnyRange(ranges): Collection;
keys(): Promise;
last(): Promise;
limit(n: number): Collection;
modify(changeCallback: (obj: T, ctx:{value: T}) => void): Promise;
modify(changes: { [keyPath: string]: any } ): Promise;
noneOf(keys: Array): Collection;
notEqual(key): Collection;
offset(n: number): Collection;
or(indexOrPrimayKey: string): WhereClause;
orderBy(index: string): Collection;
primaryKeys(): Promise;
put(item: T, key?: Key): Promise;
reverse(): Collection;
sortBy(keyPath: string): Promise;
startsWith(key: string): Collection;
startsWithAnyOf(prefixes: string[]): Collection;
startsWithAnyOfIgnoreCase(prefixes: string[]): Collection;
startsWithIgnoreCase(key: string): Collection;
toArray(): Promise;
toCollection(): Collection;
uniqueKeys(): Promise;
until(filter: (value) => boolean, includeStopEntry?: boolean): Collection;
update(key: Key, changes: { [keyPath: string]: any }): Promise;
This is a mix of methods from WhereClause, Table and Collection. Dive into the API reference to see the details.
Hello World (Typescript)
import Dexie, { Table } from 'dexie';
interface Friend {
id?: number;
name?: string;
age?: number;
}
//
// Declare Database
//
class FriendDatabase extends Dexie {
public friends!: Table<Friend, number>; // id is number in this case
public constructor() {
super("FriendDatabase");
this.version(1).stores({
friends: "++id,name,age"
});
}
}
const db = new FriendDatabase();
db.transaction('rw', db.friends, async() => {
// Make sure we have something in DB:
if ((await db.friends.where({name: 'Josephine'}).count()) === 0) {
const id = await db.friends.add({name: "Josephine", age: 21});
alert (`Addded friend with id ${id}`);
}
// Query:
const youngFriends = await db.friends.where("age").below(25).toArray();
// Show result:
alert ("My young friends: " + JSON.stringify(youngFriends));
}).catch(e => {
alert(e.stack || e);
});
Samples
https://dexie.org/docs/Samples
https://github.com/dexie/Dexie.js/tree/master/samples
Knowledge Base
https://dexie.org/docs/Questions-and-Answers
Website
Install over npm
npm install dexie
Download
For those who don't like package managers, here's the download links:
Legacy:
https://unpkg.com/dexie@latest/dist/dexie.min.js
https://unpkg.com/dexie@latest/dist/dexie.min.js.map
Modern:
https://unpkg.com/dexie@latest/dist/modern/dexie.min.mjs
https://unpkg.com/dexie@latest/dist/modern/dexie.min.mjs.map
Typings:
https://unpkg.com/dexie@latest/dist/dexie.d.ts
Contributing
See CONTRIBUTING.md
Build
pnpm install
pnpm run build
Test
pnpm test
Watch
pnpm run watch
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