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Ilya Kantor 2019-06-28 12:17:35 +03:00
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6-data-storage/03-indexeddb/article.md
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@ -799,12 +799,11 @@ IndexedDB can be thought of as a "localStorage on steroids". It's a simple key-v
The best manual is the specification, [the current one](https://w3c.github.io/IndexedDB) is 2.0, but few methods from [3.0](https://w3c.github.io/IndexedDB/) (it's not much different) are partially supported.
The usage can be described with a few phrases:
The basic usage can be described with a few phrases:
1. Get a promise wrapper like [idb](https://github.com/jakearchibald/idb).
2. Open a database: `idb.openDb(name, version, onupgradeneeded)`
- Create object storages in indexes in `onupgradeneeded` handlers.
- Update version if needed - either by comparing numbers or just checking what exists.
- Create object storages and indexes in `onupgradeneeded` handler or perform version update if needed.
3. For requests:
- Create transaction `db.transaction('books')` (readwrite if needed).
- Get the object store `transaction.objectStore('books')`.