IDBFactory

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.

* Some parts of this feature may have varying levels of support.

IndexedDB API 的IDBFactory 接口让程序可以异步存取 indexed databases。window.indexedDB 对象实现了这个接口。你可以通过这个对象而不是直接使用IDBFactory接口打开——创建或者连接——和删除一个数据库。

Methods

IDBFactory.open

请求打开一个数据库的连接（connection to a database）。

IDBFactory.deleteDatabase

请求删除数据库。

IDBFactory.cmp

比较两个键的方法并返回一个结果，表明哪个值更大。

过时的 Methods

IDBFactory.open, the original version

一个被废弃的方法请求打开一个数据库的连接，仍然在一些浏览器中被实施 (connection to a database).

Example

In the following code snippet, we make a request to open a database, and include handlers for the success and error cases. For a full working example, see our To-do Notifications app (view example live.)

js
var note = document.querySelector("ul");

// In the following line, you should include the prefixes of implementations you want to test.
window.indexedDB =
  window.indexedDB ||
  window.mozIndexedDB ||
  window.webkitIndexedDB ||
  window.msIndexedDB;
// DON'T use "var indexedDB = ..." if you're not in a function.
// Moreover, you may need references to some window.IDB* objects:
window.IDBTransaction =
  window.IDBTransaction ||
  window.webkitIDBTransaction ||
  window.msIDBTransaction;
window.IDBKeyRange =
  window.IDBKeyRange || window.webkitIDBKeyRange || window.msIDBKeyRange;
// (Mozilla has never prefixed these objects, so we don't need window.mozIDB*)

// Let us open version 4 of our database
var DBOpenRequest = window.indexedDB.open("toDoList", 4);

// these two event handlers act on the database being opened successfully, or not
DBOpenRequest.onerror = function (event) {
  note.innerHTML += "<li>Error loading database.</li>";
};

DBOpenRequest.onsuccess = function (event) {
  note.innerHTML += "<li>Database initialised.</li>";

  // store the result of opening the database in the db variable. This is used a lot later on, for opening transactions and suchlike.
  db = request.result;
};

Specifications

Specification
Indexed Database API 3.0
# factory-interface

Browser compatibility

See also