idb-batch

Perform batch operation on IndexedDB

Create/update/remove objects from IndexedDB store in one transaction without blocking the main thread. This module also manually validates unique indexes, fixing bugs in WebKit and IndexedDBShim.

Example

Using idb-factory and ES2016 async/await syntax. Check test.js for more examples.

import batch from 'idb-batch'
import { open } from 'idb-factory'

// open IndexedDB database with 2 stores
const db = await open('mydb', 1, upgradeCallback)

// modify object store
await batch(db, 'magazines', [
  { type: 'add', key: 1, value: { name: 'M1', frequency: 12 } },
  { type: 'add', key: 2, value: { name: 'M2', frequency: 24 } },
  { type: 'add', key: 3, value: { name: 'M3', frequency: 6 } },
  { type: 'del', key: 4 },
]).then((result) => {
  console.log(result) // [1, 2, 3, undefined]
}).catch((err) => {
  console.error(err)
})

function upgradeCallback(e) {
  e.target.result.createObjectStore('books', { keyPath: 'id' })  
  e.target.result.createObjectStore('magazines')  
}

batch(db: IDBDatabase, storeName: String, ops: Array|Object)

This creates a readwrite transaction to storeName, and performs ops sequentially. It returns a Promise which resolves with the results of each request.

Array notation is inspired by LevelUP. Each operation is an object with 3 possible properties: type, key, value. type is either add, put, or del, and key is optional (when the store has a keyPath and the supplied value contains it).

await batch(db, 'books', [
  { type: 'add', key: 1, value: { name: 'M1', frequency: 12 } },
  { type: 'del', key: 2 }
  { type: 'put', value: { id: 3, name: 'M3', frequency: 24 } }, // no key
])

Object notation is sugar on top of array notation for put/del operations. Set key to null in order to delete a value.

await batch(db, 'storage', {
  key1: 'update value',
  key2: null, // delete value
  key3: 'new value',
})

ConstraintError

If during sequential execution one of the operations throws a ConstraintError, the Promise rejects with an error, but previous successful operations will commit. This behavior may change in future versions, as I figure out how to properly abort transactions in IndexedDBShim.

LICENSE

MIT