Mol_db NPM | npm.io

$mol_db

Static typed facade for IndexedDB with simple API.

Teaser

type User = {
	name: string
	admin: boolean
}

// Static typed schema
type DB = {
	User: {
		Key: [ string ]
		Doc: User
		Indexes: {
			Name: [ string ]
		}
	}
}

// Automatic migrations
const db = await $mol_db< DB >( '$my_app',
	mig => mig.store_make( 'User' ),
	mig => {
		const { User } = mig.stores
		User.index_make( 'Name', [ 'name' ] )
	},
)

// Writing transaction
const { User } = db.change( 'User' ).stores
await User.put({ name: 'Jin', admin: true })

// Reading transaction
const { Name } = db.read( 'User' ).User.indexes
const jins = await Name.select([ 'Jin' ])

IndexedDB Structure

Database contains named Stores
- Store contains Documents by primary keys and named Indexes
- - Document contains any data
- - Index points to Documents

DB life Cycle

type ACME = {
	Users: {
		Key: number
		Doc: {
			name: {
				first: string
				last: string
			}
			age: number
		}
		Indexes: {
			names: [ string, string ]
			ages: [ number ]
		}
	}
	Articles: {
		Key: string
		Doc: {
			title: string
			content: string
		}
		Indexes: {
			full: [ string, string ]
		}
	}
}

const db = await $$.$mol_db< ACME >( 'ACME' )

const db = await $$.$mol_db< ACME >( 'ACME',
	mig => mig.store_make( 'Users' ),
	mig => mig.stores.Users.index_make( 'ages', [ 'age' ] ),
	mig => mig.stores.Users.index_make( 'names', [ 'name.first', 'name.last' ], true ),
	mig => mig.store_make( 'Articles' ),
	mig => mig.stores.Articles.index_make( 'full', [ 'title', 'content' ] ),
	// mig => mig.stores.Articles.index_drop( 'full' ),
	// mig => mig.store_drop( 'Articles' ),
)

There is 5 migrations. And DB version is 6. After uncommenting last 2 rows, it applies 2 additional migrations and DB version will be 8.

db.destructor()

db.kill()

Transaction Life Cycle

const { Users, Articles } = db.read( 'Users', 'Articles' )

const trans = db.change( 'Users', 'Articles' )
const { Users, Articles } = trans.stores

// ...

trans.abort()
// or
await trans.commit()

Uncommitted transaction without errors will be committed automatically. Any modification error aborts transaction.

Documents Life Cycle

const key = await Users.put({
	first: 'Jin',
	last: 'Nin',
	age: 36,
})

await Users.put( {
	first: 'Jin',
	last: 'Nin',
	age: 37,
}, 1 )

const user = await Users.get( 1 )

const users = await Users.get( $mol_dom_context.IDBKeyRange.bound( 10, 50 ), 10 )

const count = await Users.count( $mol_dom_context.IDBKeyRange.bound( 10, 50 ) )

const { names, ages } = users.indexes

const user = await names.get([ 'Jin', 'Nin' ])

const users = await ages.get( [ 18 ], 10 )

const count = await Users.count([ 18 ])

Usage from NPM

npm install mol_db

import { $mol_db } from 'mol_db'

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$mol_db

Teaser

IndexedDB Structure

DB life Cycle

DB Schema Example

Open DB without Migrations

Open DB with automatic migrations

Close DB Connection

Delete DB

Transaction Life Cycle

Read Only Transactions

Read/Write Trasactions

Documents Life Cycle

By Primary key

Insert with Auto Incremental Primary Key

Put/Overwrite by Primary Key

Get One By Primary Key

Select 10 By Primary Keys

Count By Primary Keys

By Index

Get One By Index

Select 10 By Index

Count By Primary Keys

Usage from NPM