IDBFactory

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 (en-US)
请求删除数据库。
IDBFactory.cmp (en-US)
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 This is an obsolete API and is no longer guaranteed to work.
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.)

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 Status Comment
Indexed Database API 2.0
IDBFactory
Recommendation  

Browser compatibility

BCD tables only load in the browser

See also